Question # 1

A certain force gives an acceleration of 2 m/sec2 to a body if mass 5 kg. The same force would give a 29 kg object an acceleration of:

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0.5 m/sec2

5 m/sec2

1.5 m/sec2

9.8 m/sec2

A ball is dropped from a height of 4.2 meters. To what height it will rise if there is no loss of KE after rebounding?

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4.2 m

8.4

12.6

None of these

For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increases to

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Four times

Thrice

Once

Twice

The projectile attains maximum horizontal range when it is projected at an angle of

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30°

45°

60°

75°

Inertia mass and gravitational mass are

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opposite

identical

identical when there is no friction

all of them

The collision in which KE is conserved but momentum is not conserved is called:

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Elastic collision

Inelastic collision

any these

None of these

Which one of the following is dimensionless.

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Acceleration

Velocity

Density

Angle

The motion of a body in a straight line is the motion in

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one dimension

two dimension

three dimension

four dimension

If d is the displacement of the body in time t, then its average velocity will be

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V_av= d x t

V_{av = t/d}

V_{av = d/t}

Acceleration in a body is always produced in the direction of :

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Velocity

Weight

Force

Both B and C

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

None of these

Range of a projectile is R, when the angle of projection is 30° . Then, the value of the other angle of projection for the same range, is

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45°

60°

50°

40°

A 5 kg mass is falling freely, the force acting on, it will be

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19.6 N

9.8 N

5 N

Zero

The path described by a projectile is called its

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orbit

trajectory

range

distance

In equation F=ma, then mass 'm' is

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rest mass

variable mass

inertial mass

gravitational mass

If the slope of the velocity-time graph increases at constant rate with time, then the body is said to have

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uniform deceleration

uniform negative acceleration

average acceleration

uniform positive acceleration

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