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100 MCQs About Natural Disasters

General Knowledge, MCQs / Q&A /

1. Which disaster are most likely to extinguish the human race? – Volcanoes and extraterrestrial impacts
2. What’s the smallest asteroid or comet that could cause devastating effects for humanity? – 1 kilometer wide – the equivalent of about a 10-minute walk
3. What is the biggest coronal mass ejections (CME) on record to hit Earth? – The arrington Event
4. What is the chance that a Carrington-like storm will hit in the next ten years? – 12 %
5. Which of these events may have been responsible for nearly wiping out the human race? – A supervolcano
6. How far does a supervolcano’s incineration zone extend? – 100 Kilometers
7. Where is the world’s biggest earthquake machine located? – Miki, Japan
8. What, according to some scientists, is the ideal post apocalyptic food? – Mushrooms
9. At No. 1 on the list, _____ are the most common natural disaster. – Floods
10. Landslides, tsunamis and avalanches can all be caused by what other natural disaster? –Earthquakes
11. Which volcanic feature is the deadliest? – The flow of ash, rock and gasses moving down a volcano’s side
12. The deadliest natural disaster in U.S. history was a _____ that hit Galveston, TX in 1900, killing about 7,000 people. – Hurricane
13. What makes a tornado dark colored? – The dirt and debris it sucks up
14. One of America’s worst natural disasters occurred in 1980, when a _____ damaged much
of the southern U.S. – Heat Wave
15. Below average rainfall for a prolonged period of time is called – Drought
16. What is a Tsunami? – A large wave usually formed by undersea earthquakes and landslides.
17. A sudden movement in the earth’s crust caused by movements of tectonic plates is called? – An earthquake
18. What is a natural disaster? – When a natural hazard impacts on the community causing destruction of property and loss of life.
19. The phenomenon of unusually cool ocean currents off the coast of Australia is called – El Nino
20. The social impacts of natural hazards include: – Loss of income to people or damage to an industry, illnesses cause by hazard, no form of communication
21. Natural Hazards can be separated into _________ and ________ categories. – Economic Impacts and Environmental Impacts
22. Indicates the severity of an earthquake in terms of the damage that it inflicts on structures and people – Intensity Scale
23. Boundary where plates are moving towards each other – Convergent
24. A fan shaped deposit of sand and gravel at the mouth of a mountain canyon where the stream gradient flattens at main valley floor – Alluvial Fan
25. A ground depression caused by collapse into an underground cavern – Sinkhole
26. Volcanic dome composed of rhyolite and rhyodacite – Rhyolite Dome
27. Form as sediment is deposited in the slower waters on the inside of the meander bends – Point bar
28. The number peaks per second – Frequency
29. Record local and very strong earthquakes – Strong-motion Seismograph
30. A measure of the total energy expended during an earthquake; depends on its seismic moment determined by: rock shear strength, area of rock, average slip distance offset across the – Moment Magnitude
31. A landslide in which the mass rotates as it slides on a basal slip surface – Rotational Slide
32. Blocky basalt lava with a ragged clinkery surface – Aa Flow
33. Karst-like landscape in permafrost terrain caused by melting of thermofrost under increasing temperatures – Thermokarst
34. Flat-topped volcano formed by an eruption under a glacier – Tuya
35. Molten rock – Magma
36. Record both local and distant earthquakes; but cannot accurately measure strong earthquakes in the direct vicinity – Broadband Seismograph
37. A slurry of rock, sand, water flowing downslope; water usually makes up less than half of the flow volume –Debris Flow
38. Ice that crystallizes in pores between grains of sediment – Interstitial Ice
39. Developed 1953l based on maximum amplitude of earthquake waves recorded on a Wood Anderson Seismograph – Richter Magnitude Scale
40. The total area inundated by the tsunami – Run-out distance
41. The height to which a tsunami wave rushes up onshore – Run-up height
42. Rigid outer rind of Earth approximately 60-100km thick – Lithosphere
43. Maximum angle of which sediment particles can stand without falling (dependent on grain size, grain angularity, moisture content) – Critical Angle of Repose
44. Heavier sediment in a stream that is moved along the stream bed rather than in suspension – Bedload
45. Energy level between Richter Scale Units differs by ______ times – 31.5
46. A flow of mud, rock, and water dominated by clay-sized particles – Mud Flow
47. Rapid movement of land, ranging from cm/hr to m/s of material disappearing almost instantaneously – Collapse
48. Relatively flat lowland that borders a river usually dry but subject to flooding – Floodplain
49. Water saturated sediment jostled by an earthquake rearrange themselves into a closer packing arragement – Liquefaction
50. Where the earthquake actually happens in the earth’s crust, where energy is radiating out from all directions – Focus
51. A circular or oval feature resulting from the dissolution of rock – Doline
52. Natural & Human Created Hazard like floods, droughts, wildland fires, weather phenomena, landslides are called – Hydrometeorological Hazards
53. Type of collision forms continent volcanic arc of stratovolcanoes – Ocean-Continent
54. Basalt lava with a ropy or smooth top – Pahoehoe Flow
55. Magma that flows out onto the ground surface – Lava
56. Fragmental material blown out of a volcano (ex. tephra, cinders, and bombs) – Pyroclastic
57. A particle of volcanic ash between 2mm and 6mm across – Lapilli
58. Type of collision that forms oceanic island arc of basaltic volcanoes – Ocean-Ocean
59. Point where boundaries of 3 plates meet – Triple Junction
60. Natural Hazards like Earthquakes, Tsunami, Volcanic Eruptions, Asteroid/Comet Impacts, Landslides are called – Geophysical Hazard
61. Rapid discharge of water from an ice-dammed lake, typically resulting from a volcanic eruption – Jokulhlaup
62. Tsunami that strikes area adjacent to its point of origin – Near Field Tsunami
63. A broad expanse of basalt lava that cooled to fill in low-lying areas of the landscape – Flood Basalt
64. An extremely large basalt-lava volcano, gently sloping sides – Shield Volcano
65. Where the earthquake actually appears on the earth’s surface, sometimes there is a rupture at that point – Epicentre
66. Downslope creep driven by sequential freezing and thawing – Gelifluction
67. A huge collapse depression at the Earth’s surface that sank into a near-surface magma chamber during eruption of the magma – Resurgent Caldera
68. The length of a fault broken during an earthquake – Surface Rupture Length
69. Developed in 1902 by Giuseppe Mercalli – Mercalli Intensity Scale
70. Measure earthquakes quantitatively, independent of location and assigns a magnitude value based on energy released – Magnitude Scale
71. Involves the movement of a slab of rock, debris, or cohesive mud as a single unit – Slide
72. The time between seismic waves – Period
73. Extremely rapid downslope movement of large volumes of rock and debris – Sturzstrom
74. Secondary/Shear waves that shake back and forth perpendicular to the direction of wave travel, cannot travel through a liquid (4.5km/s upper mantle, 3.5km/s crust) – S Wave
75. Used to measure earthquakes – Seismograph
76. The potential degree to which an individual or community could be affected by a natural hazard – Sensitivity
77. Records distant earthquakes – Long-period Seismograph
78. A river characterized by multiple, frequency shifting channels – Braided River
79. An ice jam initiated by rpaid change in temperature – Thermal Ice Jam
80. Extremely slow downslope flow of sediment on the surface – Creep
81. Slope of the river channel; typically decreases downstream – Gradient
82. A mudflow associated with volcanic action or involving volcanic materials – Lahar
83. Component of stress perpendicular to the earth’s planar surface (force keeping the boulder/grain from moving) – Normal Stress
84. A flow involving movement of broken rock, with little sand or mud, and particle-particle contact; usually developed in gravel or sand – Grain Flow
85. A mass of cold, solid rock ejected from a volcano – Block
86. Fine materials (dust, ash, and cinders) produced by volcanic action – Tephra
87. An elevation that a stream cannot erode past, controlled by level of the body of water which the stream discharges into – Base Level
88. A landslide that moves along a regular sloping planar surface – Translational Slide
89. Mineral composed of potassium chloride, a salt used in manufacturing fertilizer – Sylvite
90. Mineral or rock composed of sodium chloride; susceptible to dissolution – Halite
91. An event involving a significant number of people and/or significant economic damage – Disaster
92. The deepest parts of the channel along the length of the stream bed – Thalweg
93. Lenses of pure ice developed in permafrost sediment – Segregated Ice
94. An abnormally long wavelength wave produced by sudden displacement of water – Tsunami
95. Topographic line or boundary separating watersheds – Drainage Divide
96. Formed on the ceiling of a cavern when water percolates through fractures in limestone – Stalactite
97. A large steep-sided volcano consisting of layers of ash, fragmental debris and lava – Stratovolcanoes
98. The amount the fault or ridge moves away from its point of origin (aka displacement) – Offset
99. A mass of liquid of partially solidified rock that is ejected from a volcano – Bomb
100. Relatively slow movement of land, typically at rates of cm/yr – Subsidence

 

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General Knowledge, MCQs / Q&A

General Science & Ability | Constituents and Structure Solved MCQs (Set-III)

General Knowledge, MCQs / Q&A /

Click 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.

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General Knowledge, MCQs / Q&A

Constituents and Structure Solved MCQs (Set-I) | General Science & Ability

General Knowledge, MCQs / Q&A /

The universe, Galaxy, Light Year, Solar System, Sun, Earth, Astronomical System of Units

1) 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)

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General Knowledge, MCQs / Q&A

Units of Measurement

General Knowledge /

?• 1 horsepower is 745.7 watts
?• 1 horsepower = work equal to lifting 550 lbs of weight to one foot for one second
?• 1 calorie is equal to 4.2 Joules
?• 1 barrel is equal to 159 liters
?• 6 feet = 1 fathom
?• 1 kwh = 3.6 x 10 power 6 joules
?• A 100 watt bulb lights for 1 hour uses 100 watt hour of electricity
?• -273 degree centigrade is called absolute zero temperature.
?• Standard pressure is 760 mm or 14.7 lb/in2
?• Gross is equal to 12 dozens
?• Mach 2 = 500 miles per hour
?• 1 nautical mile = 1825 meters
?• Unit of pressure is Pascal
?• Force is measured in Newton (SI), Dyne (CGS)
?• At -40 deg F Fahrenheit scale is equal to centigrade scale
?• Hertz and Angstrom are units of frequency
?• Units of work and energy are Joule and Erg (CGS)
?• Diopter is unit of power of lens
?• Unit is density is kg/m3
?• Unit of power is watt, BTU (Board of Trade Unit)
?• Unit of electric charge is Coulomb
?• Unit of voltage is volt
?• Unit of electric resistance is ohm
?• Unit of capacitance is Farad
?• Unit of magnetic flux is Weber, Tesla
?• Unit of radioactivity is Becquerel
?• Unit of luminous intensity is candle, lux
?• Unit of crude oil is Barrel
?• Unit of volume of water is cusec, cubic/sec

Units of Measurement Read More »

General Knowledge