Who invented the Hot Air Balloon?
Who invented the Hot Air Balloon?
A. Davy
B. Montgolfier
C. Edison
D. Jarvik
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Sunlight is made of__________colours?
Sunlight is made of__________colours?A. Seven colours
B. Five colours
C. Three colours
D. Non of theseIf the length of a heater coil is reduced by 10% of its original length, then Power consumed by heater will?
If the length of a heater coil is reduced by 10% of its original length, then Power consumed by heater will?A. Increase over 10%
B. Decrease by 10%
C. Decrease by 0.5%
D. Increase by 0.5%Chemical formula for Water is _______ ?
Chemical formula for Water is _______ ?A. NaAlO2
B. H2O
C. Al2O3
D. CaSiO3Water is a chemical substance with the chemical formula H2O. Its molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth’s hydrosphere, and the fluids of most living organisms. It is vital for all known forms of life, even though it provides no calories or organic nutrients.
Which element has the most % in human body?
Which element has the most % in human body?A. Oxygen 65%
B. Calcium 75%
C. Hydrogen 10%
D. Carbon 18%Most of the ozone in the atmosphere is concentrated in the____________?
Most of the ozone in the atmosphere is concentrated in the____________?A. Mesosphere
B. Troposphere
C. Stratosphere
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One of the main function of the earth’s ozone layer is to ?A. Prevent global warming
B. Filter out ultraviolet rays
C. Absorb pollution
D. All of the above