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Chemistry Questions Answers
Which one of the following conversions takes place in the process of photosynthesis?
Heat energy to kinetic energey
Light energy to chemical energy
Thermal energy to electromagnetic energy
Electromagnetic energy to chemical energy
Light energy to chemical energy
Machine parts get jammed in winter, because
the viscosity of the lubricant used in machine parts increases with the decrease in temperature
the viscosity of lubricant used in machine parts decreases with the decrease in temperature
the inertia of machine parts decreases with the decreases in temperature
the inertia of machine parts increases with the decrease in temperature
the viscosity of the lubricant used in machine parts increases with the decrease in temperature
During winter, the atmospheric temperature drops, leading to a rapid increase in the viscosity of lubricating oil. Consequently, machine parts in direct contact with the oil experience difficulty in smooth movement, ultimately resulting in jams.
Cyclotron is a device which
detects and analyses the spectrum of light emitted by stars
Accelerates sub-atomic particles using combined electric and magnetic fields
detects the cyclic variation in the intensity of electromagnetic radiation emitted from stars
measures the intensity of X-rays
Accelerates sub-atomic particles using combined electric and magnetic fields
Small droplets of a liquid are spherical in shape because of
viscosity
surface tension
thermal conductivity
density
surface tension
Which one of the following is a mixture?
Diamond
Table salt
Sugar
Sea Water
Sea Water
Seawater is a homogeneous mixture because it contains sodium chloride, magnesium sulphate and calcium etc.
An element is best characterized by its
electronic configuration
atomic number
atomic weight
atomic volume
atomic number
Which one of the following is used as a filler in rubber tyres?
Graphite
Carbon black
Coke
Coal
Carbon black
Consider the following drugs.
1. Griseofulvin.
2. Streptomycin.
3. Quinine.
Among these. antibiotics would include
1 and 2
1 and 3
2 and 3
1, 2 and 3
1, 2 and 3
Consider the following statements:
Ammonia is
1. readily soluble in water.
2. used as a refrigerant.
3. used for preparation of polypropylene.
4. used as an additive in cooking gases.
Which of these statements are correct?
1 and 2
2 and 4
3 and 4
1 and 3
2 and 4
Dry ice is —
super-cooled ice
solid water with zero humidity
solid carbon dioxide
solidified ammonia
solid carbon dioxide