A clear sky is blue because?

A. red light is scattered more than blue

B. ultra violet light has been absorbed

C. blue light is scattered more than red

D. blue light has been absorbed

Mercury is an unusual substance because it is

A. a metal but in liquid form

B. liquid at room temperature

C. extremely sensitive to temperature variations

D. rarely available

D. Both a, b & c

Can you name the scientist who first of all did some, experiments with gravity? Laws of Gravitation came much later.

A. Newton

B. Cavendish

C. Galileo

D. Marconi

Kinetic energy is the energy that is produced by the fact of

A. nuclear explosion

B. human effort

C. any movement of an object

D. water power

Sound travels in Water than in air

A. much faster

B. much slower

C. at no difference

D. None

Roentgen rays are

A. alpha rays

B. sun rays

C. electromagnetic rays

D. X-rays

As a person becomes older, his blood pressure generally?

A. increases

B. decreases

C. remains the same

D. None

Coronary heart disease is most often found in persons suffering from:

A. Anaemia

B. Hemophilia

C. High blood pressure

D. Low blood pressure

Lightning is caused when

A. similar charges of electricity rush towards each other

B. opposite charges in different clouds break down the resistance offered by the intervening air

C. clouds strike against impurities in air and result in a gigantic frictional flare-up

D. earth exerts a pull on the floating clouds

Frost is not formed generally on cloudy nights. Reasons?

A. Absence of water vapour in the air;

B. Clouds generate air currents and disturbances which do not promote frosty conditions

C. Clouds prevent radiation and therefore help the ground temperature remain higher

D. moisture of air has been sucked away by the clouds