In airline slang what is a 365?
Question
In airline slang what is a 365?
Answer
Eggs Bacon served any day or time
In airline slang what is a 365? Read More »
General Knowledge, MCQs / Q&AQuestion
In airline slang what is a 365?
Answer
Eggs Bacon served any day or time
In airline slang what is a 365? Read More »
General Knowledge, MCQs / Q&ASeptember 28 – History, Events, Births, Deaths, Holidays and Observances On This Day Read More »
On This Day, UncategorizedJuly 21- History, Events, Births, Deaths Holidays and Observances On This Day Read More »
On This DayMarch 30 – History, Events, Births, Deaths, Holidays and Observances On This Day Read More »
On This DayFebruary 29, also known as leap day or leap year day, is a date added to most years that are divisible by 4, such as 2016, 2020, and 2024. A leap day is added in various solar calendars (calendars based on the Earth’s revolution around the Sun), including the Gregorian calendar standard in most of the world. Lunisolar calendars (whose months are based on the phases of the Moon) instead add a leap or intercalary month
In the Gregorian calendar, years that are divisible by 100, but not by 400, do not contain a leap day. Thus, 1700, 1800, and 1900 did not contain a leap day; neither will 2100, 2200, and 2300. Conversely, 1600 and 2000 did and 2400 will. Years containing a leap day are called leap years. Years not containing a leap day are called common years. In the Chinese calendar, this day will only occur in years of the monkey, dragon, and rat.
A leap day is observed because the Earth’s period of orbital revolution around the Sun takes approximately six hours longer than 365 whole days. A leap day compensates for this lag, realigning the calendar with the Earth’s position in the Solar System; otherwise, seasons would occur later than intended in the calendar year. The Julian calendar used in Christendom until the 16th century added a leap day every four years; but this rule adds too many days (roughly three every 400 years), making the equinoxes and solstices shift gradually to earlier dates. By the 16th century the vernal equinox had drifted to March 11, so the Gregorian calendar was introduced both to shift it back by omitting several days, and to reduce the number of leap years via the aforementioned century rule to keep the equinoxes more or less fixed and the date of Easter consistently close to the vernal equinox.
Leap days can present a particular problem in computing known as the leap year bug when February 29 is not handled correctly in logic that accepts or manipulates dates. For example, this has happened with ATMs and Microsoft’s cloud system Azure.
Although most modern calendar years have 365 days, a complete revolution around the Sun (one solar year) takes approximately 365 days, 5 hours, 48 minutes, and 46 seconds (or, for simplicity’s sake, approximately 365 days and 6 hours, or 365.25 days) .An extra 23 hours, 15 minutes, and 4 seconds thus accumulates every four years (again, for simplicity’s sake, approximately an extra 24 hours, or 1 day, every four years), requiring that an extra calendar day be added to align the calendar with the Sun’s apparent position. Without the added day, in future years the seasons would occur later in the calendar, eventually leading to confusion about when to undertake activities dependent on weather, ecology, or hours of daylight.
Solar years are actually slightly shorter than 365 days and 6 hours (365.25 days), which had been known since the 2nd century BC when Hipparchus stated that it lasted 365 + 1/4 − 1/300 days, but this was ignored by Julius Caesar and his astronomical adviser Sosigenes. The Gregorian calendar corrected this by adopting the length of the tropical year stated in three medieval sources, the Alfonsine tables, De Revolutionibus, and the Prutenic Tables, truncated to two sexagesimal places, 365 14/60 33/3600 days or 365 + 1/4 − 3/400 days or 365.2425 days. The length of the tropical year in 2000 was 365.24217 mean solar daysAdding a calendar day every four years, therefore, results in an excess of around 44 minutes every four years, or about 3 days every 400 years. To compensate for this, three days are removed every 400 years. The Gregorian calendar reform implements this adjustment by making an exception to the general rule that there is a leap year every four years. Instead, a year divisible by 100 is not a leap year unless that year is also divisible by 400. This means that the years 1600, 2000, and 2400 are leap years, while the years 1700, 1800, 1900, 2100, 2200, 2300, and 2500 are not leap years.
The Gregorian calendar repeats itself every 400 years, which is exactly 20,871 weeks including 97 leap days (146,097 days). Over this period, February 29 falls on Sunday, Tuesday, and Thursday 13 times; Friday and Saturday 14 times; and Monday and Wednesday 15 times. Except for a century mark that is not a multiple of 400, consecutive leap days fall in order Sunday, Friday, Wednesday, Monday, Saturday, Thursday, Tuesday, and repeats again.
Adding a leap day (after 23 February) shifts the commemorations in the 1962 Roman Missal.
The calendar of the Roman king Numa Pompilius had only 355 days (even though it was not a lunar calendar) which meant that it would quickly become unsynchronized with the solar year. An earlier Roman solution to this problem was to lengthen the calendar periodically by adding extra days to February, the last month of the year. February consisted of two parts, each with an odd number of days. The first part ended with the Terminalia on the 23rd, which was considered the end of the religious year, and the five remaining days formed the second part. To keep the calendar year roughly aligned with the solar year, a leap month, called Mensis Intercalaris (“intercalary month”), was added from time to time between these two parts of February. The (usual) second part of February was incorporated in the intercalary month as its last five days, with no change either in their dates or the festivals observed on them. This followed naturally because the days after the Ides (13th) of February (in an ordinary year) or the Ides of Intercalaris (in an intercalary year) both counted down to the Kalends of March (i.e. they were known as “the nth day before the Kalends of March”). The Nones (5th) and Ides of Intercalaris occupied their normal positions.
The third-century writer Censorinus says:
When it was thought necessary to add (every two years) an intercalary month of 22 or 23 days, so that the civil year should correspond to the natural (solar) year, this intercalation was in preference made in February, between Terminalia [23rd]and Regifugium [24th].
The set leap day was introduced in Rome as a part of the Julian reform in the 1st century BCE. As before, the intercalation was made after February 23. The day following the Terminalia (February 23) was doubled, forming the “bis sextum“—literally ‘twice sixth’, since February 24 was ‘the sixth day before the Kalends of March’ using Roman inclusive counting (March 1 was the Kalends of March and was also the first day of the calendar year). Inclusive counting initially caused the Roman priests to add the extra day every three years instead of four; Augustus was compelled to omit leap years for a few decades to return the calendar to its proper position. Although there were exceptions, the first day of the bis sextum (February 24) was usually regarded as the intercalated or “bissextile” day since the 3rd century CE. February 29 came to be regarded as the leap day when the Roman system of numbering days was replaced by sequential numbering in the late Middle Ages, although this has only been formally enacted in Sweden and Finland. In Britain, the extra day added to leap years remains notionally the 24th, although the 29th remains more visible on the calendar.
A person born on February 29 may be called a “leapling”, a “leaper”, or a “leap-year baby”. Some leaplings celebrate their birthday in non-leap years on either February 28 or March 1, while others only observe birthdays on the authentic intercalary date, February 29.
In the United Kingdom and its former colony Hong Kong, when a person born on February 29 turns 18, they are considered to have their birthday on March 1 in the relevant year.
In New Zealand, a person born on February 29 is deemed to have their birthday on February 28 in non-leap years, for the purposes of Driver Licensing under §2(2) of the Land Transport (Driver Licensing) Rule 1999. The net result is that for drivers aged 75, or over 80, their driver licence expires at the end of the last day of February, even though their birthday would otherwise fall on the first day in March in non-leap years. Otherwise, New Zealand legislation is silent on when a person born on February 29 has their birthday, although case law would suggest that age is computed based on the number of years elapsed, from the day after the date of birth, and that the person’s birth day then occurs on the last day of the year period. This differs from English common law where a birthday is considered to be the start of the next year, the preceding year ending at midnight on the day preceding the birthday. While a person attains the same age on the same day, it also means that, in New Zealand, if something must be done by the time a person attains a certain age, that thing can be done on the birthday that they attain that age and still be lawful.
In Taiwan, the legal birthday of a leapling is February 28 in common years:
Thus, in England and Wales or in Hong Kong, a person born on February 29 will have legally reached 18 years old on March 1. If they were born in Taiwan they legally become 18 on February 28, a day earlier.
In the United States, according to John Reitz, a professor of law at the University of Iowa, there is no “… statute or general rule that has anything to do with leap day.” Reitz speculates that “March 1 would likely be considered the legal birthday in non-leap years of someone born on leap day,”using the same reasoning as described for the United Kingdom and Hong Kong. However, for the purposes of Social Security, a person attains the next age the day before the anniversary of birth. Therefore, Social Security would recognize February 28 as the change in age for leap year births, not March 1
There are many instances in children’s literature where a person’s claim to be only a quarter of their actual age turns out to be based on counting only their leap-year birthdays.
A similar device is used in the plot of Gilbert and Sullivan’s 1879 comic opera The Pirates of Penzance: as a child, Frederic was apprenticed to a band of pirates until his 21st birthday. Having passed his 21st year, he leaves the pirate band and falls in love. However, since he was born on February 29, his 21st birthday will not arrive until he is eighty-eight (since 1900 was not a leap year), so he must leave his fiancée and return to the pirates.
Since 1967, February 29 has been the official birthday of Superman, but not Clark Kent.
There is a popular tradition known as Bachelor’s Day in some countries allowing a woman to propose marriage to a man on February 29If the man refuses, he then is obliged to give the woman money or buy her a dress. In upper-class societies in Europe, if the man refuses marriage, he then must purchase 12 pairs of gloves for the woman, suggesting that the gloves are to hide the woman’s embarrassment of not having an engagement ring. In Ireland, the tradition is supposed to originate from a deal that Saint Bridget struck with Saint Patrick.
In the town of Aurora, Illinois, single women are deputized and may arrest single men, subject to a four-dollar fine, every February 29.
In Greece, it is considered unlucky to marry on a leap day.
February 29 – History, Events, Births, Deaths, Holidays and Observances On This Day Read More »
On This DayClick HERE for Q.No.1-50
Click HERE for Q.No.51-100
101) Which type of star is maintained by the pressure of an electron gas?
(a) Main Sequence Star
(b) White Dwarf
(c) Neutron Star
(d) Black Hole
Answer: (b)
White dwarfs are stars supported by pressure of degenerate electron gas. i.e. in their interiors thermal energy kT is much smaller then Fermi energy Ep. We shall derive the equations of structure of white dwarfs, sometimes called degenerate dwarfs, in the limiting case when their thermal pressure may be neglected, but the degenerate electron gas may be either non-relativistic. somewhat relativistic. or ultra-relativistic.
102) Which of the following first hypothesized that the Earth orbited the sun?
(a) Alexander the Great
(b) Copernicus
(c) Socrates
(d) Tycho Brahe
Answer: (b)
Nicolaus Copernicus was a Renaissance mathematician and astronomer who formulated a model of the universe that placed the Sun rather than the Earth at the center of the universe.
103) The LAST manned moon flight was made in what year?
(a) 1971 (b) 1972
(c) 1973 (d) 1974
Answer: (b)
The last manned landing Apollo 17 on the Moon to date, which took place on December 11, 1972, was made by Commander Eugene Cernan and lunar module pilot Harrison Schmitt who was also the first scientist on the Moon.
104) A planet is said to be at aphelion when it is:
(a) closest to the sun
(b) farthest from the sun
(c) at it’s highest point above the ecliptic
(d) at it’s lowest point below the ecliptic
Answer: (b)
105) The word Albedo refers to which of the following?
(a) The wobbling motion of a planet
(b) The amount of light a planet reflects
(c) The phase changes of a planet
(d) The brightness of a star
Answer: (b)
Albedo is a measure of the reflectivity of a surface. The albedo effect when applied to the Earth is a measure of how much of the Sun’s energy is reflected back into space. Overall, the Earth’s albedo has a cooling effect. (The term ‘albedo’ is derived from the Latin for ‘whiteness’).
106) A pulsar is actually a:
(a) black hole
(b) white dwarf
(c) red giant
(d) neutron star
Answer: (d)
107) Astronomers use Cepheid’s principally as measures of what? Is it:
(a) size
(b) speed
(c) chemical composition
(d) distance
Answer: (d)
108) Where are most asteroids located? Is it between:
(a) Jupiter and Saturn
(b) Mars and Venus
(c) Earth and Mars
(d) Mars and Jupiter
Answer: (d)
109) The precession of the Earth refers to the:
(a) change from night to day.
(b) Earth’s motion around the sun.
(c) change in orientation of the Earth’s axis.
(d) effect of the moon on the Earth’s orbit.
Answer: (c)
Precession is the change in orientation of the Earth’s rotational axis. The precession cycle takes about 19,000 – 23,000 years. Precession is caused by two factors: a wobble of the Earth’s axis and a turning around of the elliptical orbit of the Earth itself (Thomas, 2002). Obliquity affected the tilt of the Earth’s axis, precession affects the direction of the Earth’s axis. The change in the axis location changes the dates of perihelion (closest distance from sun) and aphelion (farthest distance from sun), and this increases the seasonal contrast in one hemisphere while decreasing it in the other hemisphere ( Kaufman, 2002). currently, the Earth is closest to the sun in the northern hemisphere winter, which makes the winters there less severe (Thomas, 2002). Another consequence of precession is a shift in the celestial poles. 5000 years ago the North Star was Thuban in the constellation Draco. Currently the North Star is Polaris in the constellation Ursa Minor.
110) The Magellanic cloud is a:
(a) nebula
(b) galaxy
(c) super nova remnant
(d) star cluster
Answer: (b)
111) The comet known as Halley’s Comet has an average period of:
(a) 56 years
(b) 66 years
(c) 76 years
(d) 86 years
Answer: (c)
Halley’s Comet orbits the Sun every 76.0 years and has an orbital eccentricity of 0.97. Comet Halley was visible in 1910 and again in 1986. Its next perihelion passage will be in early 2062.
112) Which one of the following planets has no moons?
(a) Mars
(b) Neptune
(c) Venus
(d) Jupiter
Answer: (c)
113) The rocks that enter the earth’s atmosphere and blaze a trail all the way to the ground and do not burn up completely are known as:
(a) meteorites
(b) meteors
(c) asteroids
(d) none of these
Answer: (a)
A meteorite is a solid piece of debris from an object, such as a comet, asteroid, or meteoroid, that originates in outer space and survives its passage through the Earth’s atmosphere and impact with the Earth’s surface
114) 95% of the Martian atmosphere is composed of what substance?
(a) Carbon dioxide
(b) Nitrogen
(c) Argon
(d) Carbon monoxide
Answer: (a)
The atmosphere of Mars is about 100 times thinner than Earth’s, and it is 95 percent carbon dioxide.
115) What is the motion called when a planet seems to be moving westward in the sky?
(a) Retrograde
(b) Parallax
(c) Opcentric
(d) Reverse parallax
Answer: (a)
Retrograde motion, in astronomy, describes the orbit of a celestial body that runs counter to the direction of the spin of that body which it orbits. Apparent retrograde motion, in astronomy, is the apparent motion of planets as observed from a particular vantage point.
116) In what year did Galileo first use an optical telescope to study the moon?
(a) 1492 (b) 1611
(c) 1212 (d) 1743
Answer: (b)
117) Geocentric means around:
(a) Jupiter (b) the Earth
(c) the Moon (d) the Sun
Answer: (b)
118) The Pythagoreans appear to have been the first to have taught that the Earth is:
(a) at the center of the Universe.
(b) spherical in shape.
(c) orbits around the sun.
(d) flat with sharp edges.
Answer: (b)
119) A device which would not work on the Moon is:
(a) thermometer
(b) siphon
(c) spectrometer
(d) spring balance
Answer: (b)
Siphons will not work in the International Space Station where there is air but no gravity, but neither will they work on the Moon where there is gravity but no air
120) Of the following colors, which is bent least in passing through aprism?
(a) orange (b) violet
(c) green (d) red
Answer: (d)
121) In a reflecting telescope where in the tube is the objective mirror placed?
(a) the top to the tube
(b) the middle of the tube
(c) the bottom of the tube
(d) the side of the tube
Answer: (c)
122) What does it mean when someone says that comets have eccentric orbits? Does it mean
(a) they have open orbits
(b) they have nearly circular orbits
(c) their orbits are unpredictable
(d) the sun is far from the foci of their orbits
Answer: (d)
123) What causes the gas tail of a comet to always point away from the sun?
(a) solar wind
(b) air pressure
(c) centrifugal force
(d) gravity
Answer: (a)
124) What are Saturn’s rings composed of?
(a) completely connected solid masses
(b) billions of tiny solid particles
(c) mixtures of gases
(d) highly reflective cosmic clouds
Answer: (b)
125) Of the following, which is the only planet which CANNOT be seen with the unaided eye?
(a) Jupiter
(b) Mars
(c) Neptune
(d) Saturn
Answer: (c)
The ice giant Neptune was the first planet located through mathematical predictions rather than through regular observations of the sky. Nearly 4.5 billion kilometers (2.8 billion miles) from the Sun, Neptune orbits the Sun once every 165 years. It is invisible to the naked eye because of its extreme distance from Earth. In 2011 Neptune completed its first orbit since its discovery in 1846.
126) Accretion is:
(a) the gradual accumulation of matter in one location usually due to gravity.
(b) the process of moon formation for planets.
(c) the process of matter accumulation due to centripetal force.
(d) the disintegration of matter.
Answer: (b)
127) A blue shift means a Doppler shift of light from a(an)
(a) receding star.
(b) blue star.
(c) approaching star.
(d) fixed star.
Answer: (c)
In the Doppler effect for visible light, the frequency is shifted toward the blue end of the spectrum when the light source (such as a star) is approaching.
128) The first and largest asteroid discovered was:
(a) Pallas.
(b) Juno.
(c) Ceres.
(d) Trojan.
Answer: (c)
129) The Crab Nebula consists of the remnants of a supernova which was observed by:
(a) Brahe in 1572.
(b) Kepler and Galileo in 1604.
(c) the Chinese in 1054 A.D.
(d) several ancient civilizations in 236 B.C.
Answer: (c)
The Crab Nebula, the result of a supernova noted by Earth-bound chroniclers in 1054 A.D., is filled with mysterious filaments that are are not only tremendously complex, but appear to have less mass than expelled in the original supernova and a higher speed than expected from a free explosion. The Crab Nebula spans about 10 light-years. In the nebula’s very center lies a pulsar: a neutron star as massive as the Sun but with only the size of a small town. The Crab Pulsar rotates about 30 times each second.
130) The atmosphere of Venus contains mostly
(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) water
Answer: (b)
The atmosphere of Venus is composed of about 96% carbon dioxide, with most … various other corrosive compounds, and the atmosphere contains little water.
131) On the celestial sphere, the annual path of the Sun is called
(a) the eclipse path.
(b) ecliptic.
(c) diurnal.
(d) solstice.
Answer: (b)
The ecliptic is an imaginary line on the sky that marks the annual path of the sun. It is the projection of Earth’s orbit onto the celestial sphere.
132) The angular distance between a planet and the Sun, as viewed from the Earth, is called
(a) angle of inclination.
(b) elongation.
(c) latitude.
(d) opposition.
Answer: (b)
Elongation is the angular distance between the sun, and another object such a moon or a planet as seen from earth. There are several special names for these angular distances. The different names of these angles depend on the status, inferior or superior, of the planet. The planets closer to the sun than the earth are called inferior planets. The planets farther away from the sun than earth are called superior planets.
Elongation is measured from earth as the angle between the sun and the planet. Sometimes the apparent relative position of a planet in relation to the sun is called the aspect, or configuration, of a planet.
133) Which of the following has the highest density?
(a) Earth
(b) Venus
(c) Mars
(d) Jupiter
Answer: (a)
Earth has the highest density of any planet in the Solar System, at 5.514 g/cm3. This is considered the standard by which other planet’s densities are measured. In addition, the combination of Earth’s size, mass and density also results in a surface gravity of 9.8 m/s². This is also used as a the standard (one g) when measuring the surface gravity of other planets.
134) Which of the following planets is NOT a terrestrial planet?
(a) Earth
(b) Jupiter
(c) Mars
(d) Mercury
Answer: (b)
The term terrestrial planet is derived from the Latin “Terra” (i.e. Earth). Terrestrial planets are therefore those that are “Earth-like”, meaning they are similar in structure and composition to planet Earth. All those planets found within the Inner Solar System – Mercury, Venus, Earth and Mars – are examples of terrestrial planets. Each are composed primarily of silicate rock and metal, which is differentiated between a dense, metallic core and a silicate mantle.
135) Why do we see lunar eclipses much more often than solar eclipses?
(a) Lunar eclipses occur more often than solar eclipses.
(b) Lunar eclipses last longer than solar eclipses.
(c) The lunar eclipse is visible to much more of the Earth than a solar eclipse.
(d) The moon is closer to the Earth than the sun.
Answer: (c)
Lunar and solar eclipses occur with about equal frequency. Lunar eclipses are more widely visible because Earth casts a much larger shadow on the Moon during a lunar eclipse than the Moon casts on Earth during a solar eclipse. As a result, we are more likely to see a lunar eclipse than a solar eclipse.
136) A star like object with a very large red shift is a
(a) Neutron star.
(b) Nova.
(c) Quasar.
(d) Supernova.
Answer: (c)
Quasars: In the 1930’s, Edwin Hubble discovered that all galaxies have a positive redshift. In other words, all galaxies were receding from the Milky Way.
137) The apparent magnitude of an object in the sky describes its
(a) Size
(b) Magnification
(c) Brightness
(d) Distance
Answer: (c)
138) The Van Allen belts are:
(a) caused by the refraction of sunlight like rainbows.
(b) charged particles trapped in the Earth’s magnetic field.
(c) caused by the reflection of polar snow.
(d) caused by precession.
Answer: (b)
The Van Allen belts are a collection of charged particles, gathered in place by Earth’s magnetic field. They can wax and wane in response to incoming energy from the sun, sometimes swelling up enough to expose satellites in low-Earth orbit to damaging radiation.
139) A coordinate system based on the ecliptic system is especially useful for the studies of
(a) Planets
(b) Stars
(c) The Milky Way
(d) Galaxies
Answer: (a)
140) The mean distance of the earth from the sun in astronomical units is:
(a) 3.7 (b) 10
(c) 1 (d) 101
Answer: (c)
In astronomy, an astronomical unit is defined as the average distance from the Sun to the Earth, or about 150 million kilometers (93 million miles). You can abbreviate astronomical unit as AU.
Since the distances in astronomy are so vast, astronomers use this measurement to bring the size of numbers down.
For example, Earth is 1 au from the Sun, and Mars is 1.523 AU. That’s much easier than saying that Mars is 227,939,000 km away from the Sun.
141) What process produces a star’s energy?
(a) hydrogen and oxygen combustion
(b) nuclear fusion
(c) neutron beta decay
(d) nuclear fission
Answer: (b)
The enormous luminous energy of the stars comes from nuclear fusion processes in their centers. Depending upon the age and mass of a star, the energy may come from proton-proton fusion, helium fusion, or the carbon cycle.
142) What is the most distant object in the sky that the human eye can see without optical instruments?
(a) The Horsehead Nebula
(b) The Andromeda Galaxy
(c) The Sagittarius Constellation
(d) The Aurora Borealis
Answer: (b)
The Andromeda Galaxy (M31) is the closest large galaxy to the Milky Way and is one of a few galaxies that can be seen unaided from the Earth. In approximately 4.5 billion years the Andromeda Galaxy and the Milky Way are expected to collide and the result will be a giant elliptical galaxy. Andromeda is accompanied by 14 dwarf galaxies, including M32, M110, and possibly M33 (The Triangulum Galaxy).
143) Which civilization developed and implemented the first solar calendar?
(a) Babylonian
(b) Greek
(c) Egyptian
(d) Aztec
Answer: (c)
A solar calendar is a calendar whose dates indicate the position of the earth on its revolution around the sun and is based on the seasonal year of approximately 365 1/4 days, the time it takes the Earth to revolve once around the Sun. The Egyptians appear to have been the first to develop a solar calendar, using as a fixed point the annual sunrise reappearance of the Dog Star — Sirius, or Sothis — in the eastern sky, which coincided with the annual flooding of the Nile River. They constructed a calendar of 365 days, consisting of 12 months of 30 days each, with 5 days added at the year’s end. The Egyptians’ failure to account for the extra fraction of a day, however, caused their calendar to drift gradually into error.
144) What is the HOTTEST region of the sun?
(a) The core
(b) The photosphere
(c) The chromospheres
(d) The corona
Answer: (d)
The corona is the outermost layer of the Sun, starting at about 1300 miles (2100 km) above the solar surface (the photosphere) The temperature in the corona is 500,000 K (900,000 degrees F, 500,000 degrees C) or more, up to a few million K. The corona cannot be seen with the naked eye except during a total solar eclipse, or with the use of a coronagraph. The corona does not have an upper limit.
A study published in 2012 in Nature Communications by researchers at Northumbria University found a possible mechanism that causes some stars to have a corona that is almost 200 times hotter than their photosphere (the star’s surface).
145) The same side of the moon always faces the Earth because:
(a) the moon is not rotating about its axis.
(b) the moon’s motion was fixed at its creation by the laws of inertia.
(c) tidal forces keep the moon’s rotation and orbiting motion in sync with each other.
(d) the moon’s magnetic poles keep aligned with the Earth’s magnetic field.
Answer: (b)
146) The resolving power of a telescope depends on the:
(a) focal ratio
(b) diameter of the objective
(c) magnification
(d) focal length
Answer: (b)
The resolving power of a telescope depends on the diameter of the telescope’s light-gathering apparatus, or objective. In a refracting telescope, the objective lens is the first lens the light passes through. In a reflecting telescope, the objective is the telescope’s primary mirror. In a Schmidt-Cassegrain telescope, the objective is also the primary mirror. As the diameter of the telescope’s objective increases, the resolving power increases.
147) On a clear, dark, moonless night, approximately how many stars can be seen with the naked eye?
(a) 300 (b) 1,000
(c) 3,000 (d) 10,000
Answer: (c)
On any clear dark moonless night a person can see about 3000 stars of our galaxy without the aid of a telescope
148) The study of the origin and evolution of the universe is known as:
(a) Tomography
(b) cystoscopy
(c) cryology
(d) cosmology
Answer: (d)
Cosmology is the branch of astronomy involving the origin and evolution of the universe, from the Big Bang to today and on into the future. According to NASA, the definition of cosmology is “the scientific study of the large scale properties of the universe as a whole.”
149) According to Kepler’s Laws, all orbits of the planets are:
(a) ellipses
(b) parabolas
(c) hyperbolas
(d) square
Answer: (a)
Johannes Kepler, working with data painstakingly collected by Tycho Brahe without the aid of a telescope, developed three laws which described the motion of the planets across the sky.
1. The Law of Orbits: All planets move in elliptical orbits, with the sun at one focus.
2. The Law of Areas: A line that connects a planet to the sun sweeps out equal areas in equal times.
3. The Law of Periods: The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.
Kepler’s laws were derived for orbits around the sun, but they apply to satellite orbits as well.
General Science & Ability | Constituents and Structure Solved MCQs (Set-III) Read More »
General Knowledge, MCQs / Q&A1) The biggest planet in our solar system is (CSS 2013)
(a) Venus
(b) Pluto
(c) Jupiter
(d) None of these
Answer: (c)
In terms of mass, volume, and surface area, Jupiter is the biggest planet in our Solar System by a wide margin.
Size and Mass:
Jupiter’s mass, volume, surface area and mean circumference are 1.8981 x 1027 kg, 1.43128 x 1015 km3, 6.1419 x 1010 km2, and 4.39264 x 105 km respectively. To put that in perspective, Jupiter diameter is roughly 11 times that of Earth, and 2.5 the mass of all the other planets in the Solar System combined.
2) The universe is ———-. (CSS 1996)
(a) Stationary
(b) Expanding
(c) Contracting
(d) None of these
Answer: (b)
In June 2016, NASA and ESA scientists reported that the universe was found to be expanding 5% to 9% faster than thought earlier, based on studies using the Hubble Space Telescope
3) The atmosphere of moon consists of: (CSS 2013)
(a) . 90% Hydrogen, 10% Nitrogen
(b) . 80%Nitrogen, 20% Hydrogen
(c) 60% Nitrogen, 40%inert gases
(d) None of these
Answer: (d)
The Moon has no atmosphere. None. That’s why astronauts have to wear their spacesuits when they get outside of their spacecraft on the surface of the Moon.
Atmosphere of the Moon might be electro statically levitated moon dust. These tiny particles are constantly leaping up and down off the surface of the Moon.
4) Who gave the first evidence of the Big- Bang theory?
(a) Edwin Hubble
(b) Albert Einstein
(c) S. Chandrasekhar
(d) Stephen Hawking
Answer: (a)
The Hubble Space Telescope was named after astronomer Edwin Powell Hubble (1889–1953), who made some of the most important discoveries in modern astronomy. Dr. Hubble determined that the farther a galaxy is from Earth, the faster it appears to move away. This notion of an “expanding” universe formed the basis of the Big Bang theory, which states that the universe began with an intense burst of energy at a single moment in time — and has been expanding ever since.
5) Which one of the following planets has largest number of natural satellites or moons?
(a) Jupiter
(b) Mars
(c) Saturn
(d) Venus
Answer: (a)
In the Solar System, there are 179 satellites. A majority of those moons belong to the planet of Jupiter, the second most belonging to Saturn.
6) Which of the following planets rotates clock wise?
(a) Mars
(b) Jupiter
(c) Venus
(d) Mercury
Answer: (c)
Venus is the only planet that rotates clockwise. Venus (radius 3,760.4 miles) is similar to Earth (radius 3,963.19 miles) in size and structure but spins very slowly; a day on Venus is 243 Earth days long.
7) Which of the following order is given to the planets of solar system on the basis of their sizes?
(a) Jupiter, Saturn, Uranus, Neptune
(b) Saturn, Jupiter, Mercury, Earth
(c) Mercury, Earth, Jupiter, Saturn
(d) Earth, Mercury, Saturn, Jupiter
Answer: (a)
Jupiter (69,911 km / 43,441 miles) – 1,120% the size of Earth
Saturn (58,232 km / 36,184 miles) – 945% the size of Earth
Uranus (25,362 km / 15,759 miles) –400% the size of Earth
Neptune (24,622 km / 15,299 miles) – 388% the size of Earth
Earth (6,371 km / 3,959 miles)
8) The time taken by the Sun to revolve around the center of our galaxy is
(a) 50 Million years
(b) 100 Million years
(c) 250 Million years
(d) 365 Million years
Answer: (c)
the Sun is dragging us around the galaxy at around 800,000km/h, taking around 250 million years to complete a single orbit.
That means our Solar System has made around 18 complete circuits since it was formed around 4.5 billion years ago.
9): The planet having the largest diameter is
(a) Earth
(b) Jupiter
(c) Venus
(d) Uranus
Answer: (b)
Jupiter is composed primarily of gaseous and liquid matter. It is the largest of the four giant planets in the Solar System and hence its largest planet. It has a diameter of 142,984 km (88,846 mi) at its equator
10) The planet Mercury completes one rotation around the sun is (CSS 2010)
(a) 88 days
(b) 365 days
(c) 98 days
(d) 60 days
(e) None of these
Answer: (a)
A year on Mercury is just 88 days long. One solar day (the time from noon to noon on the planet’s surface) on Mercury lasts the equivalent of 176 Earth days while the sidereal day (the time for 1 rotation in relation to a fixed point) lasts 59 Earth days. Mercury is nearly tidally locked to the Sun and over time this has slowed the rotation of the planet to almost match its orbit around the Sun. Mercury also has the highest orbital eccentricity of all the planets with its distance from the Sun ranging from 46 to 70 million km.
11) The biggest planet in our solar system is (CSS 2013)
(a) Venus
(b) Pluto
(c) Jupiter
(d) None of these
Answer: (c)
Jupiter is the largest planet in the solar system. Jupiter has a mean radius of 43,440.7 miles (69,911 kilometers), about a tenth that of the sun. However, its rapid rotation — it spins once every 9.8 hours
12) The atmosphere of moon consists of: (CSS 2013)
(a) 90% Hydrogen, 10% Nitrogen
(b) 80%Nitrogen, 20% Hydrogen
(c) 60% Nitrogen, 40%inert gases
(d) None of these
Answer: (d)
The Apollo 17 mission deployed an instrument called the Lunar Atmospheric Composition Experiment (LACE) on the moon’s surface. It detected small amounts of a number of atoms and molecules including helium, argon, and possibly neon, ammonia, methane and carbon dioxide.
13) Which of the following explains the reason why there is no total eclipse of the sun? (CSS 2009)
(a) Size of the earth in relation to that of moon
(b) Orbit of moon around earth
(c) Direction of rotation of earth around sun
(d) Area of the sun covered by the moon
(e) None of these
Answer: (d)
A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth. A solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth’s surface.
14) The sun produces most of its energy by (CSS 2012)
(a) Nuclear fusion which involves converting “H” to “He”
(b) Nuclear fission involving the burning of uranium & plutonium
(c) Nuclear fission involving the combining of uranium and palladium
(d) None of these
Answer: (a)
Sun, like all stars, is able to create energy because it is essentially a massive fusion reaction.
The core of the Sun is the region that extends from the center to about 20–25% of the solar radius. It is here, in the core, where energy is produced by hydrogen atoms (H) being converted into molecules of helium (He) This is possible thanks to the extreme pressure and temperature that exists within the core, which are estimated to be the equivalent of 250 billion atmospheres (25.33 trillion KPa) and 15.7 million kelvin, respectively.
15) Although the mass of a man on moon remains same as on the earth he will (CSS 2012)
(a) Be much happier there
(b) Weigh one sixth as much
(c) Weigh twice as much
(d) None of these
Answer: (b)
The Moon’s gravity is one sixth of the Earth’s gravity. A 120 kg astronaut weighs 1200 N on Earth. On the Moon they would weigh only 200 N. The astronaut’s mass is 120kg wherever they are.
16) The planet of the solar system which has maximum numbers of Moon is: (CSS 2011)
(a) Jupiter
(b) Venus
(c) Saturn
(d) Uranus
(e) None of these
Answer: (a)
17): The earth rotates 011 its axis from_
(a) North to south
(b) South to north
(c) East to west
(d) West to east
Answer: (d)
The Earth rotates from the west towards east. As viewed from North Star or polestar Polaris, the Earth turns counter-clockwise. The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where the Earth’s axis of rotation meets its surface.
18): Name two planets which revolve around their axis from east to west
(a) Earth and Venus
(b) Mars and Earth
(c) Venus and Uranus
(d) Mars and Uranus
Answer: (c)
Planets have no light of their own and all of them expect Venus and Uranus, rotate upon their axis from west to east.
19) Our sun is classified as (CSS 2012)
(a) A Blue giant
(b) A Yellow dwarf
(c) Supernova
(d) None of these
Answer: (b)
The sun is classified as a G-type main-sequence star, or G dwarf star, or more imprecisely, a yellow dwarf. Actually, the sun — like other G-type stars — is white, but appears yellow through Earth’s atmosphere. Stars generally get bigger as they grow older
20): Name the planet which revolve approximately 90 degree with its orbital plane_.
(a) Neptune
(b) Venus
(c) Uranus
(d) Jupiter
Answer: (c)
Unlike any other planet, Uranus rotates on its side. That is, the rotation axis is tilted approximately 90 degrees relative to the planet’s orbital plane.
21): The hottest planet of our solar system is
(a) Mercury
(b) Venus
(c) Mars
(d) Earth
Answer: (b)
Venus’s thick atmosphere made up mainly of CO2 makes it the hottest planet in the solar system. Mercury is colder because it’s atmosphere is thin.
22): Which of the following constellation contains Pole Star?
(a) Orion
(b) Ursa Major
(c) Ursa Minor
(d) Scorpio
Answer: (b)
23): All the stars appear to move from
(a) North to south
(b) South to north
(c) East to west
(d) West to east
Answer: (c)
Every day, the Sun, Moon, planets, and stars appear to rise in the east and set in the west. Actually, these celestial objects aren’t moving that fast, but Earth is. It spins on its axis from west to east approximately every 24 hours.
Because we are standing on Earth’s surface, we move along with it. To us, it appears as if everything in the sky is moving from east to west.
24): The body burning like a star and coming towards the earth
(a) Comet
(b) Meteor
(c) Ceres
(d) Satellites
Answer: (b)
Fleeting trails of light are called meteors or shooting stars and they are created by small particles, some no bigger than a grain of rice, as they are completely burned up high in the atmosphere: about 100 km (or 60 miles) above the Earth. They are over literally in the blink of an eye. Space debris is collectively termed meteoroids, those larger fragments that reach the ground are called meteorites. Very big meteoroids are also known as asteroids. If one collides with Earth it would cause a major catastrophe.
25) Which of the following is not true?
(a) Planets rotate on their own axis.
(b) Planets do not emit light.
(c) Some planets are gaseous and some are rocky
(d) Most of the planets have rings around them.
Answer: (d)
26) Which is the brightest planet?
(a) Mars
(b) Jupiter
(c) Venus
(d) Saturn
Answer: (c)
Venus is so bright because its thick clouds reflect most of the sunlight that reaches it (about 70%) back into space, and because it is the closest planet to Earth. Venus can often be seen within a few hours after sunset or before sunrise as the brightest object in the sky (other than the moon)
27) The stars in space are ___.
(a) Uniformly spread out.
(b) Distributed completely at random
(c) Chiefly in the Milky Way
(d) Mostly contained within widely separated galaxies
Answer: (d)
28) “Black holes” refer to: (CSS 2009)
(a) Hole occurring in heavenly bodies
(b) Bright spots on the sun
(c) Collapsing objects of high density
(d) Collapsing of low density
(e) None of these
Answer: (c)
29) The Milky Way is _____.
( a) a gas cloud in the solar system
(b) a gas cloud in the galaxy of which the sun is a member
(c) the galaxy of which the sun is a member
(d) a nearby galaxy
Answer: (c)
30) Relative to the center of our galaxy, ____.
( a) its starts are stationary
(b) its stars move entirely at random
(c) its stars revolve
(d) Population I starts are stationary and Population II star revolve
Answer: (c)
31) Evidence of various kinds suggests that at the center of our galaxy is a ___.
( a) Quasar
(b) Pulsar
(c) Neutron star
(d) Black hole
Answer: (d)
A supermassive black hole (SMBH) is the largest type of black hole, in the order of hundreds of thousands to billions of solar masses (M☉), and is found in the centre of almost all currently known massive galaxies. In the case of the Milky Way, the SMBH corresponds with the location of Sagittarius A*
32) A radio telescope is basically a (an) __.
(a) device for magnifying radio waves
(b) Telescope remotely controlled by radio
(c) Directional antenna connected to a sensitive radio receiver
(d) Optical telescope that uses electronic techniques to produce an image
Answer: (c)
Radio telescope is an astronomical instrument consisting of a radio receiver and an antenna system that is used to detect radio-frequency radiation emitted by extraterrestrial sources. Because radio wavelengths are much longer than those of visible light, radio telescopes must be very large in order to attain the resolution of optical telescopes.
The first radio telescope, built in 1937 by Grote Reber of Wheaton
33) Sun is a: (CSS 2011)
(a) Planet
(b) Comet
(c) Satellite
(d) Aurora
(e) None of these
Answer: (e)
The Sun (or Sol), is the star at the centre of our solar system
The Sun is by far the largest object in the solar system. It contains more than 99.8% of the total mass of the Solar System (Jupiter contains most of the rest).
34) The age of the solar system is (CSS 2011)
(a) 4.5 billion years
(b) 5.5 billion years
(c) 6.5 billion years
(d) 7.5 billion years
(e) None of these
Answer: (e)
By studying several things, mostly meteorites, and using radioactive dating techniques, specifically looking at daughter isotopes, scientists have determined that the Solar System is 4.6 billion years old. Well, give or take a few million years. That age can be extended to most of the objects and material in the Solar System.
35) An eclipse of the sun occurs when (CSS 2011)
(a) The moon is between the sun and the earth
(b) The sun is between the earth and the moon
(c) The earth is between the sun and the moon
(d) The earth casts its shadow on the moon
(e) None of these
Answer: (a)
A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth. A solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth’s surface.
36) Founder of modern astronomy was: (CSS 2009)
(a) Archimedes
(b) William Gilbert
(c) Nicolaus Copernicus
(d) Michael Faraday
(e) None of these
Answer: (c)
Considered today to be the father of modern astronomy, Nicolaus Copernicus was born on February 19, 1473 in Torun, Poland.
37) Orbital period of the planet Mercury around the sun is: (CSS 2009)
(a) 88 days
(b) 365 days
(c) 2 years
(d) 98 days
(e) None of these
Answer: (a)
Mercury has an orbital period of 88 days (87.969 to be exact), which means a single year is 88 Earth days – or the equivalent of about 0.241 Earth years. But here’s the thing. Because of Mercury’s slow rotation (once every 58.646 days) and its rapid orbital speed (47.362 km/s), one day on Mercury actually works out to 175.96 Earth days.
38) Primary cosmic rays are composed largely of very fast ___.
( a) Protons
(b) Neutrons
(c) Electrons
(d) Gamma rays
Answer: (a)
Of primary cosmic rays, which originate outside of Earth’s atmosphere, about 99% are the nuclei (stripped of their electron shells) of well-known atoms, and about 1% are solitary electrons (similar to beta particles). Of the nuclei, about 90% are simple protons, i. e. hydrogen nuclei; 9% are alpha particles, identical to helium nuclei, and 1% are the nuclei of heavier elements, called HZE ions
39) Cosmic rays ____.
(a) Circulate freely through space
(b) are trapped in our galaxy by electric fields
(c) are trapped in our galaxy by magnetic fields
(d) are trapped in our galaxy by gravitational fields
Answer: (c)
40) The red shift in the spectral lines of light reaching us from other galaxies implies that these galaxies ______.
( a) are moving closer to one another
(b) are moving farther apart from one another
(c) are in rapid rotation
(d) Consist predominantly of red giant stars
Answer: (b)
41) According to Einstein’s general theory of relativity, the universe _____.
( a) Must be expanding
(b) Must be contracting
(c) Must be either expanding or contracting
(d) May be neither expanding nor contracting
Answer: (c)
42) Supernova explosions have no connection with _______.
( a) The formation of heavy elements
(b) Cosmic rays
(c) Pulsars
(d) Quasars
Answer: (d)
43) Current ideas suggest that what is responsible for the observed properties of a quasar is a massive ____.
(a) Neutron star
(b) Black hole
(c) Spiral galaxy
(d) Star cluster
Answer: (b)
44) The age of the universe is probably in the neighborhood of ______.
( a) 15 million years
(b) 4 ½ billion years
(c) 15 billion years
(d) 30 billion years
Answer: (c)
45) The term big bang refers to ___.
( a) the origin of the universe
(b) the ultimate fate of the universe
(c) a supernova explosion
(d) the formation of a quasar
Answer: (a)
46) The elements heavier than hydrogen and helium of which the planets are composed probably came from the __.
( a) Sun
(b) Debris of supernova explosions that occurred before the solar system came into being
(c) Big bang
(d) Big crunch
Answer: (b)
47) Today the universe apparently contains ____.
( a) Only matter
(b) Only antimatter
(c) Equal amounts of matter and antimatter
(d) Slightly more matter than antimatter
Answer: (a)
48) Radiation from the early history of the universe was Doppler-shifted by the expansion of the universe until today it is in the form of _______.
( a) X-rays
(b) Ultraviolet waves
(c) Infrared waves
(d) Radio waves
Answer: (d)
49) Present evidence suggests that most of the mass of the universe is in the form of ______.
( a) Dark matter
(b) Luminous matter
(c) Cosmic rays
(d) Black holes
Answer: (a)
50) It is likely that the planets, satellites, and other members of the solar system were formed ________.
(a) Together with the sun
(b) Later than the sun from material it ejected
(c) Later than the sun from material it captured from space
(d) Elsewhere and were captured by the sun
Answer: (a)
Constituents and Structure Solved MCQs (Set-I) | General Science & Ability Read More »
General Knowledge, MCQs / Q&A1) Who was the first cricketer to hit a triple century in a Test and create a record for highest number of runs by an individual in a Test Innings?
a) Andrew Sandham
b) C. B. Fry
c) Jack Hobbs
d) Leary Constantine
2) Who broke the previous record by scoring 334 runs in a Test Innings?
a) Donald George Bradman
b) Hanif Mohammed
c) Michael Colin Cowdrey
d) Vijay Samuel Hazare
3) How many runs were scored by Leonard Hutton to create a new world record?
a) 302
b) 336
c) 337
d) 364
4) Who could not complete his triple century against South Africa in a Test Innings and remained 299 not out as the last batting partner was run out?
a) Lawrence Rowe
b) Sunil Gavaskar
c) Donald George Bradman
d) Peter May
5) Who broke Leonard Hutton’s record by scoring 365 not out?
a) Rohan Kanhai
b) Clive Lloyd
c) Conrad Hunte
d) Garfield Sobers
6) How many runs were scored by Brian Charles Lara when he overtook the previous record that had stood for 36 years 1 month and 16 days?
a) 373
b) 375
c) 374
d) 371
7) Who broke Brian Charles Lara’s record by scoring 380?
a) Kim Hughes
b) Matthew Hayden
c) Ricky Ponting
d) Adam Gilchrist
8) Brian Charles Lara was back again to claim the world record to his name. How many runs did he score?
a) 381
b) 384
c) 390
d) 400 not out
9) Who of the following has not hit two triple centuries in Tests?
a) Brian Charles Lara
b) Donald George Bradman
c) Walter Hammond
d) Virender Sehwag
10) Who batted 970 minutes when scoring 337 runs?
a) John Edrich
b) Hanif Mohammad
c) Robert Simpson
d) Anthony Greig
Triple Centuries In Test Cricket Quiz Answers
1) Who was the first cricketer to hit a triple century in a Test and create a record for highest number of runs by an individual in a Test Innings?
a) Andrew Sandham
2) Who broke the previous record by scoring 334 runs in a Test Innings?
a) Donald George Bradman
3) How many runs were scored by Leonard Hutton to create a new world record?
d) 364
4) Who could not complete his triple century against South Africa in a Test Innings and remained 299 not out as the last batting partner was run out?
c) Donald George Bradman
5) Who broke Leonard Hutton’s record by scoring 365 not out?
d) Garfield Sobers
6) How many runs were scored by Brian Charles Lara when he overtook the previous record that had stood for 36 years 1 month and 16 days?
b) 375
7) Who broke Brian Charles Lara’s record by scoring 380?
b) Matthew Hayden
8) Brian Charles Lara was back again to claim the world record to his name. How many runs did he score?
d) 400 not out
9) Who of the following has not hit two triple centuries in Tests?
c) Walter Hammond
10) Who batted 970 minutes when scoring 337 runs?
b) Hanif Mohammad
Triple Centuries In Test Cricket Quiz Read More »
MCQs / Q&A, Sports, Test, WorldDay by Day Current Affairs (August 29, 2018) Read More »
Current Affairs, Sports, Test, World