Question # 1

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

Newton's laws are adequate for speeds that are

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low compared with the speed of light

equal to the speed of light

greater than the speed of light

all of them

Change in momentum is one second called.

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Impulse

Force

Energy

Work

The expression F x t is called impulse if the time 't' is

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zero

very large

very small

infinite

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

The product of force and time is called change in:

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Momentum

Impulse

Force

Both a and b

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 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 monkey sits on the pan of spring scale kept in an elevator. The reading of the spring scale will be maximum when

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Elevator is stationary

Elevator cable breaks and it falls freely towards earth

Elevator accelerates downwards

Elevator accelerates upward

If the acceleration of a body is not uniform, then velocity-time graph will be:

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Curve

Straight line

Sphere

All of these

If the velocity time graph is a straight line parallel to the time-axis, then it means:

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The body is moving with uniform velocity

The body is moving with uniform acceleration

The body is at rest

None of these

An inertial frame of reference is that frame of reference in which

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a = 0

a > 0

a < 0

all of them

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

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Decreases

Increases

Remains constant

None of these

Which quantity has the same dimension as that of impulse?

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KE

Power

Momentum

Work

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

Swimming becomes possible because of______law of motion.

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First

Second

Third

None of these

Earth is considered to be

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a non-inertial frame

an inertial frame

an accelerated frame

none of the above

If the objects of different masses move with the same velocity, then it is more difficult to stop the

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lighter of the two

massive of the two

any one of them

both 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

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}

An object is dropped from a height of 100 m. Its velocity at the moment it touches the ground is:

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100 m/sec

140 m/sec

1960 m/sec

196 m/sec

A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of

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3 s

5 s

7 s

9 s

The consumption source if energy is:

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Energy from blomass

Hydroelectric energy

Geothermal energy

None of these

The slopes of the tangent at any point on the curve gives the value of the

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average velocity at that point

instantaneous velocity at that point

average acceleration at that point

instantaneous acceleration at that point

In velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s. The velocity 3s before in m/s is

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8

4

6

7

A projectile on its path gets divided into two pieces at its highest point. Which is true?

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Momentum increases

Momentum decreases

Kinetic energy increases

Kinetic energy decreases

A particle of mass 0.5 g moving along x-axis is located of x₁= 15 m at t₁= 5s and x₂= 33 m at t₂= 13s its average velocity is

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6 m s^-1

2.45 m s^-1

2.25 m s^-1

4.45 m s^-1

Work done along a closed path in a gravitational field is:

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Maximum

Minimum

Zero

Unity

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

Which one of the following is dimensionless:

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Acceleration

Velocity

Density

Angle

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