Question # 1

When brakes are applied to a fast moving car, the passengers will be thrown:

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Forward

Backward

Downward

None of these

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

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10N

50N

2N

20N

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

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

When we consider the average velocity of a body, then the body is moving in

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straight line

curved path

may be in a straight or curved path

none 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

The velocity given to a body to go out of the influence of earth's gravity is known as:

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Terminal velocity

Orbital velocity

Escape velocity

None of these

The motion in a plane is the motion in

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one dimension

two dimension

three dimension

four dimension

Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first?

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The faster one

Depends on their mass

The slower one

Both will reach simultaneously

Acceleration of a body is positive, if the velocity of the body is

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constant

increasing

decreasing

none of them

At the top of the trajectory of a projectile the acceleration is

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The maximum

The minimum

Zero

g

Slope of velocity-time graph represents:

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Acceleration

Speed

Torque

Work

In above figures, tell which set of graphs shows that a body is moving with uniform velocity:

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(i) and (ii)

(ii) and (iii)

(iii) and (iv)

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

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Increases

Decreases

Remains same

None of these

A typical rocket consists of fuel

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more than 60% of launch mass

less than 60% of launch mass

less than 80% of launch mass

more than 80% of launch mass

The three equation of motions are useful only for

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linear motion with increasing acceleration

line motion with uniform acceleration

linear motion with zero acceleration

linear motion with varying acceleration

A ball is dropped vertically down and it takes time t to reach the ground. At time t/2

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The ball had covered exactly half the distance

The velocity of the ball was V/3 where V is the velocity when it reached the ground

The ball had covered less than half the distance

The ball had covered more than half the distance

A body of mass 1.0 kg is falling with an acceleration of 10 m/s². Its apparent weight will be (g=10 m/s²)

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1.0 kg wt

2.0 kg wt

0.5 kg wt

Zero

A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

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6 s

36 s

38 s

None of these

An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called

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a rocket

an aeroplane

a projectile

a ballon

Root out the conventional source of energy:

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Energy from blomass

hydroelectric energy

Geothermal energy

None of these

When brakes are applied to a fast moving car, the passenger will be thrown:

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Forward

Backward

Downward

none of these

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