The lifespan of Red Blood Cells is __________ days?
The lifespan of Red Blood Cells is __________ days?
A. 60
B. 120
C. 180
D. 240
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At what temperature are Celsius and Fahrenheit equal?
At what temperature are Celsius and Fahrenheit equal?A. -40 degree
B. 40 degree
C. -10 degree
D. 10 degreeThe formulas for converting between degree Celsius and degree Fahrenheit are:
°F = (°C * 9/5) + 32
°C = (°F – 32) * 5/9
To find the temperature when both are equal, we use an old algebra trick and just set ºF = ºC and solve one of the equations.
°C = (°C * 9/5) + 32
°C – (°C * 9/5) = 32
-4/5 * °C = 32
°C = -32 * 5/4
°C = -40
°F = (°F * 9/5) + 32
°F – (°F * 9/5) = 32
-4/5 * °F = 32
°F = -32 * 5/4
°F = -40
So the temperature when both the Celsius and Fahrenheit scales are the same is -40 degrees.Of the six noble gases in the periodic table, which is the lightest?
Of the six noble gases in the periodic table, which is the lightest?A. Nitrogen
B. Hydrogen
C. Helium
D. OxygenSodium Carbonate is commonly called ________?
Sodium Carbonate is commonly called ________?A. Plaster of Paris
B. Washing Soda
C. Common Salt
D. None of theseHow many number of milk teeth are in the human body?
How many number of milk teeth are in the human body?A. 16
B. 12
C. 22
D. 20Water has been discovered on which potentially habitable super-Earth ?
Water has been discovered on which potentially habitable super-Earth ?A. K2-14d
B. K2-15c
C. K2-13a
D. K2-18bK2-18b was first discovered in 2015 by Nasa’s now retired Kepler space telescope. It was found orbiting within the red dwarf star’s habitable zone, making it an ideal candidate to have liquid surface water.
Which of the following is a substance?
Which of the following is a substance?
A. Sea water
B. Brass
C. Tape water
D. Graphite
E. SandIn chemistry, a substance refers to a matter which has specific composition and specific properties which do not change. A substance can be an element or a compound. A substance typically has a constant composition, which can not be separated by physical methods. Seawater and sand are not substances, because they have varied compositions and their components can be separated by physical methods.