Question # 1

During the projectile motion, the horizontal component of velocity

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changes with time

remains constant

becomes zero

decreases with time

One KWh is equal to:

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3.6 x 10²J

3.6 KJ

3,6 x 10¹KJ

3,6 MJ

The magnitude of the displacement is a line from initial position to final position which is

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straight

curved

either be curved or straight

none of them

The short distance between two points direction from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

One newton is a force that produces an acceleration of 0.5 m/sec²in a body of mass:

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2 Kg

3 Kg

4 Kg

8 Kg

When a horse pulls a cart, the force that makes the horse run forward is the force exerted by

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The horse on the ground

The horse on the cart

The ground on the horse

The ground on the cart

When a body is moving with uniform positive acceleration, the velocity- time graph is a straight line. Its slope is

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zero

negative

positive

non-existing

The direction of the acceleration is the same as that of

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speed

velocity

both of them

none of them

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

The path followed by the projectile is known as:

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Cycle

Hyperbola

Trajectory

Route

Unit of impulse in

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Newton

Kg m

Kg m/s

Joule

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

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

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Decreases

Increases

Remains constant

None of these

Root out the conventional source of energy:

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Energy from blomass

hydroelectric energy

Geothermal energy

None of these

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}

Change in momentum is one second called.

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Impulse

Force

Energy

Work

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

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Decreases

Increases

Remains constant

None of these

A non-inertial frame of reference is that frame of reference in which

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a = 0

a > 0 or a < 0

v = 0

none of them

Root out of the conventional source of energy:

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Energy from biomass

Hydroelectric energy

Geothermal energy

None of these

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

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

The magnitude of the force producing an acceleration of 10 m/sec²in a body of mass 500 grams is:

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3 N

4 N

5 N

6 N

Velocity of a body changes if

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direction of the body changes

speed of the body changes

neither speed nor direction changes

either speed or direction changes

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

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The maximum

The minimum

Zero

g

A ball is thrown upwards with a velocity of 100 m/s. It will reach the ground after

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10 s

20 s

5 s

40 s

Distance traveled by a body falling from rest in the first, second and third second is in the ration of

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1 : 2 : 3

1 : 3 : 5

1 : 4 : 9

None of the above

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

A body of mass 5 kg is acted upon by a constant force of 20 n for 7 seconds. The total change in momentum will be:

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10 NS

100 NS

140 NS

200 NS

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

The range of projectile is 50 m whenθ is inclined with horizontal at 15°. What is the range whenθ becomes 45°?

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400 m

300 m

200 m

100 m

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

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rest mass

variable mass

inertial mass

gravitational mass

An aircraft is moving with a velocity of 300 ms^-1. If all the forces acting on it are balanced, then

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It still moves with the same velocity

It will be just floating at the same point in space

It will be fall down instantaneously

It will lose its velocity gradually

Change in momentum is one second is called:

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Impulse

Force

Energy

Work

When a body is moving on a surface, the force of friction is called

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Static friction

Dynamic friction

Limiting friction

Rolling friction

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

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30°

45°

60°

75°

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

An object thrown in arbitrary direction in space with an initial velocity and moving freely under gravity will follow

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a circular path

a straight line

a hyperbola

a parabola

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