SCIENTIFIC REASONING QUESTIONS FOR ALL COMPETITIVE EXAMS

         

31) Cloudy nights are usually warmer than the clear ones.

Ans: The clouds serve as a barrier and prevent the loss of heat. Thus the warm temperature is

maintained.

32) Why do some people snore?

Ans: Some people snore during their sleep because the breathing action produces sound. This is so

because the pharynx or the windpipe offers resistance to the air taken in or expelled.

33) Why do we sometimes sleep walk?

Ans: Sleep walk is a sort of disorder of sleep in which a person starts walking during his sleep. The

sleeper walks and performs complex activities automatically without regaining consciousness.

34) Climbers bend forward while climbing mountain.

Ans: While climbing a mountain, a climber bends his body forward in order to keep the centre of

gravity of his body within two thirds portion. According to this principle the Pisa Tower is not

falling.

35) Why climbers get their food by climbing on other trees?

Ans: The climbers are mostly parasites and they cannot manufacture their food. Therefore, they

climb on other trees and get food from them.

36) Mars is called red planet.

Ans: Mars is called the red planet because its colour is red due to the desert like surface.

37) Vitamin D is the essential component of the body.

Ans: Vitamin D is necessary for body because it is essential for bone formation and retention of

calcium in the human body. Vitamin D also protects the teeth.

38) The weight of the object is less at the equator than at the poles.

Ans: The weight of an object is the product of mass and force of gravity. The equatorial diameter is

more than the polar diameter. Thus, the force of gravity is more at the poles and the weight is more

there.

39) The dogs pant, the birds open their mouth and the elephants move rapidly their ears.

Ans: All of them do not sweat; they use the above mentioned mechanisms to cool themselves.

40) A geostationary satellite appears standstill to a viewer on the equator of earth.
Ans: On 23 September and 21 March we have equal days and nights all over the world. This is so

because on these days, the rays of the sun fall vertically on the equator at noon. Both the poles
receive equal rays of the sun. As a result, exactly one-half of each hemisphere receives the sun‘s rays. This makes day and night equal.