Question # 1

A person is sitting in a traveling train and facing the engine. He tosses up a coin and the coin falls behind him. It can be concluded that the train is

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Moving forward and gaining speed

Moving forward and losing speed

Moving forward with uniform speed

Moving backward with uniform speed

During the projectile motion, the horizontal component of velocity

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changes with time

remains constant

becomes zero

decreases with time

Unit of impulse in

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Newton

Kg m

Kg m/s

Joule

A train cover 90 km in half an hour. the time taken by it to travel 15 km will be:

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20 minutes

48 minutes

10 minutes

5 minutes

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

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Velocity

Weight

Force

Botha B and C

A typical rocket ejects the burnt gases at speeds over

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400 ms^-1

40000m s^-1

40000 ms^-1

60000 ms^-1

Slope of velocity-time graph represents:

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Acceleration

Speed

Torque

Work

In the expression F x t, the force F is

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total force

instantaneous force

average force

all of them

Graphs which are used to illustrate the variation of velocity of an object with time are called

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distance time graphs

speed time graphs

velocity time graphs

acceleration time graphs

A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?

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0.1 m/s

10 m/s

1 m/s

0.01 m/s

A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h. The force required to stop the vehicle in 10s is

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120 x 10.8 N

180 N

720 N

360 N

A body whose momentum is constant must have constant

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Acceleration

Velocity

Force

None of these

A cold soft drink is kept on the balance. When the cap is opened, then the weight

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Increases

Decreases

First increases, then decreases

Remains same

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

Blomass includes:

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Crop residue

Natural vegetation

Animal dung

All of these

The artillery shells travel along parabolic paths under the influence of

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magnetic field

electric field

electromagnetic field

gravitational field

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