JEE Questions for Physics Laws Of Motion Quiz 6

A car turns a corner on a slippery road at a constant speed of 10 m/s. If the coefficient of friction is 0.5, the minimum radius of the arc at which the car turns is _________ meter.

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20
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10
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5
0%
4

A person standing on the floor of a lift drops a coin. The coin reaches the floor of the lift in time to if the lift is stationary and the time t² if it is accelerated in upward direction. Then

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0%
2)
0%
0%
Cannot say anything

A lift of mass 1000 kg is moving with an acceleration of 1 ms^–2 in upward direction. Tension developed in the rope of lift is__________ N (g = 9.8 ms^–2)

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9800
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10,000
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10,800
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11,000

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20
0%
40
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10
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32

If the surfaces shown in figure are friction less, the ratio of T₁ and T₂ is _________________
Physics-Laws of Motion-76923.png

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0%
2)
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1 : 5
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5 : 1

Three masses 1 kg, 6 kg and 3 kg are connected to each other with threads and are placed on a table as shown in figure. The acceleration with which the system is moving is _________ ms^–2 (g = 10 ms^–2)
Physics-Laws of Motion-76927.png

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Zero
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1
0%
2
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3

A rope which can withstand a maximum tension of 400 N hangs from a tree. If a monkey of mass 30 kg climbs on the rope in which of the following cases-will the rope break? (take g = 10 ms^–2 and neglect the mass of rope)

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When the monkey climbs with constant speed of 5 ms–1
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When the monkey climbs with constant acceleration of 2 ms–2
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When the monkey climbs with constant acceleration of 5 ms–2
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When the monkey climbs with the constant speed of 12 ms–1

An object of mass 3 kg is moving with a velocity of 5 m/s along a straight path. If a force of 12 N is applied for 3 sec on the object in a perpendicular to its direction of motion. The magnitude of velocity of the particle at the end of 3 sec is

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5
0%
12
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13
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4

Same forces act on two bodies of different mass 2 kg and 5 kg initially at rest. The ratio of times required to acquire same final velocity is ___________

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5 : 3
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25 : 4
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4 : 25
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2 : 5

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5 s
0%
20 s
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40 s
0%
80 s

A Block of mass 300 kg is set into motion on a friction less horizontal surface with the help of friction less pulley and a rope system as shown in figure. What horizontal force F should be applied to produce in the block an acceleration of 1 ms^–2?
Physics-Laws of Motion-76934.png

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150 N
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100 N
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300 N
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50 N

A body of mass m rests on horizontal surface. The coefficient of friction between the body and the surface is . If the body is Pulled by a force P as shown in figure, the limiting friction between body and surface will be
Physics-Laws of Motion-76936.png

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2)
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0%

Three blocks A , B, and C of equal mass m are placed one over the other, one on a smooth horizontal ground as shown in figure. Coefficient of friction between any two blocks of A, B and C is 0.5. What would be the maximum value of mass of block D so that the blocks A, B and C move without slipping over each other ?
Physics-Laws of Motion-76942.png

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3 m
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5 m
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6 m
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4 m

A train is moving along a horizontal track. A pendulum suspended from the roof makes an angle of 4^o with the vertical, The acceleration of the train is __________ ms^–2 (g = 10 ms^–2)

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0.6
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0.7
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0.5
0%
0.2

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0%
2)
0%
0%

Three blocks having equal mass of 2 kg are hanging on a string passing over a pulley as shown in figure. what will be the tension produced in a string connecting the blocks B and C
Physics-Laws of Motion-76951.png

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Zero
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13.1 N
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3.3 N
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19.6 N

A partly hanging uniform chain of length L is resting on a rough horizontal table. l is the maximum possible length that can hang in equilibrium The coefficient of friction between the chain and table is __________

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0%
2)
0%
0%

As shown in figure,the block of 2 kg at one end and the other of 3 kg at the other end of a light string are connected. It the system remains stationary find the magnitude and direction of the frictional force (g = 10 ms^–2)
Physics-Laws of Motion-76958.png

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20 N, downward on slope
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20 N, upward on slope
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10 N Downward on slope
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10 N upward on slope

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(i) –p, (ii) –q
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(i) –q, (ii) –r
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(i) –r, (ii) –p
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(i) –q, (ii) –p

A car of mass 1000 kg travelling at 32 m/s clashes into a rear of a truck of mass 8000 kg moving in the same direction with a velocity of 4 m/s. After the collision the car bounces with a velocity of 8 ms^–1 The velocity of truck after the impact is ___________ m/s

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8
0%
4
0%
6
0%
9

A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped by friction in 10 s. Then the coefficient of friction is

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0.01
0%
0.02
0%
0.03
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0.06

A Block of mass m = 2 kg is resting on a rough inclined plane of inclination 30^o as shown in figure. The coefficient of friction between the block and the plane is = 0.5 . What minimum force F should be applied perpendicular to the plane of block so that block does not slip on the plane ? (g = 10 ms^–2)
Physics-Laws of Motion-76963.png

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Zero
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6.24N
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2.68 N
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4.3 N

The upper half of an inclined plane of inclination θ is perfectly smooth while the lower half is rough A body starting from the rest at top come back to rest at the bottom, then the coefficient of friction for the lower half is given by

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0%
2)
0%
0%

A Block of mass m = 4 kg is placed over a rough inclined plane as shown in figure, The coefficient of friction between the block and plane is = 0.6. A force F = 10 N is applied on the block of an angle at 30^o The contact force between the block and the plane is __________
Physics-Laws of Motion-76970.png

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27.15 N
0%
16.32 N
0%
10.65 N
0%
32.16 N

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F = ma
0%
F = mg
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F = 0
0%
None of these

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20 dyne
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5 dyne
0%
0 dyne
0%
10 dyne

Two bodies A and B each of mass m are fixed together by a mass less spring A force F acts on the mass B as shown in figure. At the instant shown, a body A has an acceleration a. what is the acceleration of B?
Physics-Laws of Motion-76975.png

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0%
2)
0%
0%

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0%
2)
0%
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3g

A mass of 6 kg is suspended by a rope of length 2 m form the ceiling. A force of 50 N in the horizontal direction is applied at the mid Point P of the rope- as shown in figure. what is the angle the rope makes with the vertical in equilibrium ? (g = 10 ms^–2) Neglect mass of the rope.
Physics-Laws of Motion-76986.png

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40o
0%
30o
0%
35o
0%
45o

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4
0%
1
0%
2
0%
3

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0%
2)
0%
0%

Assertion : Frictional forces are conservative forces.
Reason : Potential energy can be associated with frictional forces.

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Assertion is true. Reason is true and reason is correct explanation for Assertion.
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Assertion is true. Reason is true but reason is not the correct explanation of assertion.
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Assertion is ture. Reason is false
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Assertionis false. Reason is true

Assertion : A body of mass 1 kg is moving with an acceleration of 1 ms^–1. The rate of change of its momentum is 1 N.
Reason : The rate of change of momentum of body = force applied on the body.

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Assertion is true. Reason is true and reason is correct explanation for Assertion.
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Assertion is true. Reason is true but reason is not the correct explanation of assertion.
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Assertion is true. Reason is false.
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Assertion is false. Reason is true

Assertion : A body falling freely under gravity becomes weightless.
Reason : R = m(g – a) = m(g – g) = 0

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Assertion is true. Reason is true and reason is correct explanation for assertion
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Assertion is true. Reason is true but reason is not the correct explanation of assertion
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Assertion is true. Reason is false
0%
Assertion is false. Reason is true

Assertion : It is difficult to move bike with its breaks on.
Reason : Rolling friction is converted into sliding friction, which is comparatively larger

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Assertion is true. Reason is true and reason is correct explanation for assertion.
0%
Assertion is true. Reason is true but reason is not the correct explanation of assertion.
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Assertion is true. Reason is false.
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Assertion is false. Reason is true.

According to newton's second law of motion, F = ma, where F is the force required to produce an acceleration a in a body of mass m. If a = 0 than F = 0. If a force acts on a body for t seconds, the effect of the force is given by impulse = F × t = change in linear momentum of the body.
A cricket ball of mass 150 g. is moving with a velocity of 12 m/s and is hit by a bat so that the ball is turned back with a velocity of 20 m/s. If duration of contact between the ball and the bat is 0.01 sec. The impulse of the force is

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7.4 NS
0%
4.8 NS
0%
1.2 NS
0%
4.7 NS

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480 N
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120 N
0%
1200 N
0%
840 N

According to newton's second law of motion, F = ma, where F is the force required to produce an acceleration a in a body of mass m. If a = 0 than F = 0. If a force acts on a body for t seconds, the effect of the force is given by impulse = F × t = change in linear momentum of the body.
The force acting on a body whose linear momentum changes by 20 kgms^–1 in 10 sec is

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2 N
0%
20 N
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200 N
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0.2 N

According to newton's second law of motion, F = ma, where F is the force required to produce an acceleration a in a body of mass m. If a = 0 than F = 0. If a force acts on a body for t seconds, the effect of the force is given by impulse = F × t = change in linear momentum of the body.
An impulsive force of 100 N acts on a body for 1 sec What is the change in its linear momentum ?

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10 N–S
0%
100 N–S
0%
1000 N–S
0%
1 N–S

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a–s, b–p, c–q, d–r
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a–p, b–q, c–r, d–s
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a–s, b–r, c–q, d–p
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a–r, b–q, c–p, d–s

A block B, placed on a horizontal surface is pulled with initial velocity V. If the coefficient of kinetic friction between surface and block is μ, than after how much time, block will come to rest ?

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2)
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0%

As shown in figure a block of mass m is attached with a cart. If the coefficient of static friction between the surface of cart and block is μ than what would be acceleration α of cart to prevent the falling of block ?
Physics-Laws of Motion-77002.png

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0%
2)
0%
0%

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0%
2)
0%
0%

A force of 98 N is required to just start moving a body of mass 100 kg over ice. The coefficient of static friction is

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0.6
0%
0.4
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0.2
0%
0.1

Two balls of masses m₁ and m₂ are separated from each other by a powder charge placed between them. The whole system is at rest on the ground. Suddenly the powder charge explodes and masses are pushed apart. The mass m₁ travels a distance s₁ and stops. If the coefficients of friction between the balls and ground are same, the mass m₂ stops after travelling the distance

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0%
2)
0%
0%

Maximum value of static friction is called

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Limiting friction
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Rolling friction
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Normal reaction
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Coefficient of friction

Pulling force making an angle θ to the horizontal is applied on a block of weight W placed on a horizontal table. If the angle of friction is α, then the magnitude of force required to move the body is equal to

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0%
2)
0%
0%

A force of 50 dyne is acted on a body of mass 5 g which is at rest for an interval of 3 seconds, then impulse is

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0.15 × 10–3 Ns
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0.98 × 10–3 Ns
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1.5 × 10–3 Ns
0%
2.5 × 10–3 Ns

In the figure shown, a block of weight 10 N is resting on a horizontal surface. The coefficient of static friction between the block and the surface µ_s = 0.4. A force of 3.5 N will keep the block in uniform motion, once it has been set in motion. A horizontal force of 3 N is applied to the block, then the block will
Physics-Laws of Motion-77024.png

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Move over the surface with constant velocity
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Move having accelerated motion over the surface
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Not move
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First it will move with a constant velocity for some time and then will have accelerated motion

Two masses A and B of 10 kg and 5 kg respectively are connected with a string passing over a frictionless pulley fixed at the corner of a table as shown. The coefficient of static friction of A with table is 0.2. The minimum mass of C that may be placed on A to prevent it from moving i
Physics-Laws of Motion-77026.png

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15 kg
0%
10 kg
0%
5 kg
0%
12 kg

JEE Questions for Physics Laws Of Motion Quiz 6 - MCQExams.com

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JEE Questions for Physics Laws Of Motion Quiz 6 - MCQExams.com

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Practice Physics Quiz Questions and Answers

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