PG TRB Physics Study Materials 2020 - 2021 - 5

Question: 21

The rotational speed of the earth at equator is

(A) 24 ms^-1

(B) 340 ms^-1

(C) 465 ms^-1

(D) 1674 ms^-1

Question: 22

A bomb is dropped at a point from a moving aeroplane. The pilot observes that

(A) the bomb traverses a curved path and fails some distance behind that object

(B) the bomb traverses a curved path and falls some distance ahead

(C) the bomb remains stationary in the air for some time

(D) the bomb drops vertically downward

Question: 23

Displacement of one second is

(A) Momentum

(B) Acceleration

(C) Speed

(D) Velocity

Question: 24

The weight of any body is

(A) more on equator

(B) maximum at poles

(C) same at every place on earth’s surface

(D) more on mountains than in planes

Question: 25

If the spinning speed of the earth is increased then the weight of body at the equator

(A) increases

(B) decreases

(C) does not change

(D) doubles