Question # 1

When the total displacement is divided by total time taken, we get:

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Velocity

Average speed

Average velocity

None of these

Body which falls freely under gravity provides good example of motion under:

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Uniform acceleration

Non-uniform acceleration

Uniform velocity

None of these

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

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Velocity

Weight

Force

Botha B and C

Which of the following four statements is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

If a car rest acceleration uniformly to a speed of 144 km/h in 20 s it covers a distance of

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20 m

400 m

1440 m

2880 m

The path followed by the projectile is known as:

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Cycle

Hyperbola

Trajectory

Route

Which quantity has the same units as impulse

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force

work

linear momentum

acceleration

When the surfaces are coated with a lubricant, then they

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Stick to each other

Slide upon each other

Roll upon each other

None of these

The direction of the acceleration is the same as that of

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speed

velocity

both of them

none of them

The decrease in velocity per unit time is called

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deceleration

acceleration

uniform acceleration

variable acceleration

If the instantaneous velocity of a body does not change. the body is said to be moving with

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average velocity

uniform velocity

instantaneous velocity

variable velocity

When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts

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In the backward direction on the front wheel and in the forward direction on the rear wheel

In the forwards directions on the front wheel and in the backward direction on the rear wheel

In the forward direction on both the wheels

In the backward direction on both the wheels

The path described by a projectile is called its

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orbit

trajectory

range

distance

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 man sitting in a bus travelling in a direction from west to east with a speed of 40 km/h observes that the rain drops are falling vertically down. To the another man standing on ground the rain will appear

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To fall vertically down

To fall at an angle going from west to east

To fall at an angle going from east to west

The information given is insufficient to decide the direction of rain

A train of 150 m length is going towards north direction at a speed of 10 ms^-1. A parrot files at a speed of 5 ms^-1towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to

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12 s

8 s

15 s

10 s

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