General Science Mcqs for PPSC, FPSC, NTS

The atmospheric greenhouse effect is produced mainly by the __________________?

A. Absorption and re-emission of visible light by the atmosphere
B. Absorption and re-emission of ultraviolet radiation by the atmosphere
C. Absorption and re-emission of infrared radiation by the atmosphere
D. Absorption and re-emission of visible light by clouds
E. Absorption and re-emission of visible light by the ground

At what time of day is the relative humidity normally at a minimum ________________ ?

A. When the air temperature is highest
B. Just before sunrise
C. About midnight
D. When the air temperature is lowest

Water vapor is ______________?

A. A gas
B. A cloud droplet
C. A raindrop
D. A snowflake

Acid deposition causes ______________________?

A. the greenhouse effect to lessen
B. lakes and forests to die
C. acid indigestion in humans
D. all the above are correct

Salinization is ___________?

A. Accumulation of salts in water
B. Accumulation of salts in soil
C. Accumulation of salts in body
D. Accumulation of salts in animals

The gradual physiological adjustment to slowly changing new environmental conditions is known as _____________________?

A. Selection
B. Introduction
C. Acclimatization
D. Quarantine

Approximate age of the moon is _________?

A. 4.51 billion years
B. 4.55 billion years
C. 4.53 billion years
D. 4.57 billion years

Approximate age of earth is ________?

A. 4.14 billion years
B. 4.64 billion years
C. 4.54 billion years
D. 4.34 billion years

Approximate age of the milky-way is ________?

A. 16.5 billion years
B. 15.5 billion years
C. 13.5 billion years
D. 14.5 billion years

Nearest galaxy to our milky way is ________?

A. Messier 81
B. Andromeda
C. Triangulum
D. Whirlpool

One Astronomical unit is equal to how much Km in whole numbers?

A. 160 million km
B. 140 million km
C. 150 million km
D. 130 million km

The hard, solid rocks, whose composition or texture has been changed by heat or pressure in the Earth, are called____________?

A. Sedimentary rocks
B. Metamorphic rocks
C. Igneous rocks
D. All of the above