Which of the following is not true about frictional force? It.....

A. increases motion

B. opposes motion

C. damages machines

D. produces heat

E. decreases efficiency of machines

The instrument used in measuring the speed of wind is called:

A. Thermometer

B. Wind Vane

C. Photometer

D. Anemometer

E. Hygrometer

The force which comes into operation when a ball rolls on the ground is:

A. gravitational force

B. frictional force

C. magnetic force

D. electrostatic force

E. Force due to tension

Which of the following is true about a first class lever?

A. The load is between the effort and the pivot

B. The pivot is between the effort and the load

C. The effort is between the pivot and the load

D. The load is on the pivot

E. There is no pivot

In which of the following situations is work not done? When a.......

A. truck moves

B. wheelbarrow is pushed

C. fruit falls from a tree

D. football is kicked

E. book lies on a table

Which of these structures regulate the amount of light that enters the eye?

A. Retina

B. Cornea

C. Pupil

D. Choroid

E. Lens

All of the following are herbivores except.......

A. sheep

B. dog

C. goat

D. grasscutter

E. rabbit

The brain and the spinal cord are part of the.....

A. digestive system

B. circulatory system

C. respiratory system

D. nervous system

E. excretory system

Which of the following is used by green plants for respiration?

A. Carbon dioxide

B. Oxygen

C. Light

D. Water

E. Chlorophyll

A fish dies shortly after being removed from water. This is because it......

A. cannot swim

B. is streamlined

C. is hot on land

D. has scales

E. cannot respire