mechanics (mass, force, acceleration, work, energy, momentum, velocity) - Category wise Question and Answer Practice Test with Solutions

Question : 21

A parachutist jumps from a height of 5000 metre. The relationship between his falling speed, v and the distance fallen through d is best represented as :

a)

b)

c)

d)

Question : 22

No work is done when

a) there is no component of force parallel to the direction of motion

b) a box is pushed along a horizontal floor

c) a nail is plugged into a wooden board

d) there is no component of force normal to the direction of force

Question : 23 [UPRO/ARO (Mains) 2014]

Which of the following is a vector quantity?

a) Displacement

b) Speed

c) Time

d) Distance

Question : 24 [CDS]

When an incandescent electric bulb glows

a) the light energy is converted into electric energy

b) the electric energy is partly converted into light energy and partly into heat energy

c) the electric energy is completely converted into light

d) the electric energy is converted into magnetic energy

Question : 25

A body weighs less at the equator than at the poles because:

1. earth rotates about its axis.
2. the ice cap at the poles increases gravitational pull.
3. equatorial diameter is greater than the polar diameter.
4. of some unknown facts.

a) 1 and 3

b) 1 and 2

c) 3 only

d) 4 only