Question # 1

A mass of 5kg moves with an acceleration of 10m s^-2force applied is

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10N

50N

2N

20N

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}

Newton's first law is also called:

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Law of torque

Law of force

Law of inertia

None of these

Maximum height of a bullet when fixed at 30 with horizontal is 11 m. Then height when it is fired at 60° is

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22 m

6 m

33 m

7.8 m

The displacement coincides with the path of the motion when a body moves is a

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curved line

straight line

may be curved or straight

none of them

One KWh is equal to:

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3.6 x 10²J

3.6 KJ

3.6 x 10¹KJ

3.6 MJ

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

A body moving with an acceleration of 5 m/sec²started with velocity of 10 m/sec. What will be the distance traversed in 10 seconds?

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150 m

250 m

350 m

400 m

When two protons are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

Rate of change of momentum is called

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Impulse

Force

Torque

Momentum

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

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2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

A lift is moving up with acceleration equal to 1/5 of that due to gravity. The apparent weight of a 60 kg man standing in lift is

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60 kg wt

72 kg wt

48 kg wt

Zero

A lift is descending at a constant speed V. A passenger in the lift drops a coin. The acceleration of the coin towards the floor will be

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Zero

g

-g

V + g

A rocket carries its own fuel in the form of

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liquid only

liquid or solid

liquid and solid

liquid or solid and oxygen

When a shell explodes in mid-air, its fragments fly off in

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only one direction

in two direction

different directions

a particular direction

A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h. The average speed of the car is

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37.5 km/h

10 km/h

42 km/h

40 km/h

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