# IIT JEE/IIT JEE Laws Of Motion Sample Test,Sample questions

1.1:02

2.2:01

3.1:03

4.3:01

1.1:02

2.1:03

3.2:01

4.3:01

1.32 N

2.18 N

3.19 N

4.9.8 N

1.80N

2.40N

3.34.6N

4.32.3

## Question: ```A ball hangs from a string inside a rail road car moving along a straight track. The string is observed to be inclined towards the rear of the car making a constant small angle with vertical. It shows that the car is ```

1.moving with a uniform acceleration

2.moving with a uniform velocity

3.moving with a uniform retardation

4.moving with an acceleration which is increasing uniformly.

## Question: ```A bicycle is in motion. When it is not pedaled the force of friction exerted by the ground on the two wheels is such that it acts: ```

1.in the backward direction on the front wheel and in the forward direction on the rear wheel

2.in the forward direction on the front wheel and in the backward direction on rear wheel

3.in the backward direction on both the front and the rear wheels

4.in the forward direction on both the front and the rear wheel

1.zero

2.3.9 N

3.5.0 N

4.49 N

## Question: ```A block has weight W and it is held against a vertical wall by applying a horizontal force F. The minimum value of F is ```

1.less than W

2.equal to W

3.greater than W

4.not settled by the data

1.3

2.3.3

3.0.27

4. 0.33

1.3s

2.4s

3.3v2s

4.5s

1.25N

2.0.98N

3.4.9N

4.0.49N

## Question: ```A block of mass 10 kg is suspended through two light springs which are balanced as shown in the figure. Then: ```

1.both the scales will read 10 kg

2.both the scales will read 5 kg

3.the upper scale will read 10 kg and the lower zero

4.the readings may be of any value but their sum will be 10 kg

1.2.8N

2.8N

3.2N

4.none of these

1.0 N

2.4 N

3.6 N

4.10 N

1.32N

2.18N

3.19N

4.9.8N

1.0.4

2.0.6

3.0.8

4.0.75

1.P / M(m + M)

2.P / M - m

3.Pm / M - m

4.PM / m + M

## Question: ```A block of mass M is suspended by a string A from the ceiling and another string B is connected to the bottom of the block. If B is pulled on steadily: ```

1.A breaks earlier than B

2.B breaks earlier than A

3.both break simultaneously not possible to say which

4.one will break earlier

1.mg

2.mc

3.(m + M)g

4.zero

1.2

2.4

3.1.6

4.2.5

## Question: ```A body is at rest on the surface of the earth. Which of the following statements is correct? ```

1.No force is acting on the body

2.Only weight of the body acts on it

3.Net downward force is equal to the net upward force

4.None of the above statement is correct

1.2 s

2.3 s

3.4 s

4.none of these

## Question: ```A body of mass 32 kg is suspended by a spring balance from the roof of a vertically operating lift and going downward from rest. At the instant the lift has covered 20 m and 50 m the spring balance showed 30 kg and 36 kg respectively. Then the velocity of the lift is ```

1.increasing at 20 m and increasing at 50 m

2.increasing at 20 m and decreasing at 50 m

3.continuously decreasing at a steady rate throughout the journey.

4.constantly increasing at constant rate throughout the journey.

1.13 g

2.12 g

3.15.5 g

4.15 g

1.200 J

2.250 J

3.500 J

4.100 J

1.2-Jan

2.3-Jan

3.4-Jan

4.5-Jan

1.196 cm/s

2.9.8 cm/s

3.98 cm/s

4.980 cm/s

1.20%

2.25%

3.35%

4.15%

1.20%

2.25%

3.35%

4.15%

1.20N

2.50N

3.100N

4.2N

## Question: ```A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is: ```

1.both the scales read M kg each

2.the scale of the lower one reads M kg and of the upper one zero

3.the reading of the two scales can be anything but the sum of the reading will be M kg

4.both the scales read M/2 kg

1.200 dyne

2.2000 dyne

3.20 dyne

4.none of these

## Question: ```A man is pulling a rope attached to a block on a smooth horizontal table. The tension in the rope will be the same at all points: ```

1.if and only if the rope is not accelerated

2.if and only if the rope is massless

3.if either the rope is not accelerated or is massless

4.always

1.0.02

2.0.03

3.0.06

4.0.01

## Question: ```A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that: ```

1.its velocity is constant

2.its kinetic energy is constant

3.it moves in a circular path

4.both B and C are correct

1.l / L - l

2.L / l

3.l / L

4.l L / L + l

1.FL / x

2.F (L - x) / L

3.FL / L - x

4.Fx / L - x

1.Accelerated

2.Uniform

3.Retarded

4.None of these

1.Accelerated

2.Uniform

3.Retarded

4. None of these

1.24N

2.74N

3.15N

4.49N

1.g

2.2g

3.3g

4.zero

1.mg N

2.5mg N

3.6mg N

4.8mg N

## Question: ```A uniform chain is coiled up on a horizontal plane and one end passes over a small light pulley at a height a above the plane. Initially a length b hangs freely on the other side. If b = 2a: ```

1.the end descends with a constant acceleration g/3

2.the end descends with acceleration depends upon hanging position

3.acceleration can not be determined

4.acceleration is variable

## Question: ```A uniform chain is coiled up on a horizontal plane and one end passes over a small light pulley at a height a above the plane. Initially a length b hangs freely on the other side. If b = 2a: ```

1.the end descends with a constant acceleration g/3

2.the end descends with acceleration depends upon hanging position

3.acceleration can not be determined

4.acceleration is variable

## Question: ```A weight w is suspended from the midpoint of a rope whose ends are at the same level. In order to make the rope perfectly horizontal the force applied to each of its ends must be: ```

1.less than w

2.equal to w

3.equal to 2w

4.infinitely large

1.8000N

2.1600N

3.9600N

4.6400N

1.1 kg

2.1.5 kg

3.2 kg

4.2.5 kg

1.- 5 cm

2.+ 5 cm

3.+ 20 cm

4.- 20 cm

1.7N

2.25N

3.35N

4.none of these

1.Mg

2.Mg (1 - h / S)

3.Mg (1 = h / S)

4.Mgh

## Question: ```Brakes of a very small contact area are not used although friction is independent of area. It is because friction: ```

1.depends on the nature of the material

2.cause wear and tear

3.resists motion

4.operating in this case is sliding friction

## Question: ```Choose the correct option or options. ```

1.Tension force always pulls a body

2.Tension can never push a body or rope

3.Tension across massless or frictionless pulley remains constant

4.Rope becomes slack when tension force becomes zero

1.10 kg

2.15 kg

3.12 kg

4.None of these

## Question: ```For the equilibrium of a body on an inclined plane of inclination 450 the coefficient of static friction will be: ```

1.greater than one

2.less than one

3.zero

4.less than zero

1.343J

2.482J

3.14.4J

4.None of these

## Question: ```In the superhit film Raja Hindustani Amir Khan greets his beloved by shaking hand. What kind of force do they exert? ```

1.Nuclear

2.Gravitational

3.Weak

4.Electromagnetic

## Question: ```In which of the following cases the net force is not zero? ```

1.A kite skillfully held stationary in the sky

2.A ball freely falling from a height

3.An aeroplane rising upwards at an angle of 45 degree with the horizontal with a constant speed

4.A cork floating on the surface of water

## Question: ```Mark correct option or options. ```

1.Friction always opposes the motion of a body

2.Friction only opposes the relative motion between surfaces

3.Kinetic friction depends on the speed of body when the speed of body is less than 10 m/s

4.The coefficient of friction is always less than or equal to one

## Question: ```Mark correct option or options. ```

1.The body of greater mass needs more forces to move due to more inertia

2.Force versus time graph gives impulse

3.Microscopic area of contact is about 10-4 times actual area of the contact

4.All of the above

1.mnu

2.2 mnu

3.4 mnu

4.1 / 2 mnu

1.0.33

2.0.25

3.0.75

4.0.8

1.4

2.8

3.16

4.32

## Question: ```The action and reaction forces referred to newtons third law of motion: ```

1.must act upon the same body

2.must act upon different bodies

3.need not to be equal in magnitude but must have the same line of action must be equal in

4.magnitude but need not have the same line of action

## Question: ```The action and reaction forces referred to newtons third law of motion: ```

1.must act upon the same body

2.must act upon different bodies

3.need not to be equal in magnitude but must have the same line of action

4.must be equal in magnitude but need not have the same line of action

1.343J

2.482J

3.14.4J

4.None of these

1.60 m/s

2.30 m/s

3.15 m/s

4.25 m/s

1.10 kg

2.15 kg

3.12 kg

4.5 kg

1.g / 3

2.g / 2

3.g

4.2g

1.3/2 g

2.g/3

3.g

4.2/3 g

## Question: ```Two bodies have same mass and speed then: ```

1.their momentums are same

2.the ratio of momentums is not determined

3.the ratio of their magnitudes of momentum is one

4.both B and C are correct

1.59.8 N

2.69.8 N

3.7 9.8 N

4.8 9.8 N

1.5g

2.8g

3.7.5g

4.15g

1.200 dyne

2.400 dyne

3.1800 dyne

4.none of these

1.Inertia

2.Velocity

3.Reaction

4.Momentum

## More MCQS

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