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Showing posts with label Newton’s Laws of Motion and Friction. Show all posts
Showing posts with label Newton’s Laws of Motion and Friction. Show all posts

## Physics objective questions, Test Series 4 with solutions - Newton’s Laws of Motion and Friction

Below is another set of 10 MCQ practice questions (Q.No.31 - 40) with hints & solutions (link given at the end) from the Physics chapter -Newton’s Laws of Motion and Friction. Physics test series, questions asked in NEET, JEE Main, Medical and Engineering Entrance Exams
Questions from some of these topics (randomly selected):
Force and Inertia; Law of Inertia; Newton’s First Law of Motion; Center of Mass; Momentum; Newton’s Second Law of Motion; Impulse; Newton’s Third Law of Motion; Law of Conservation of Linear Momentum and its applications; Variable Mass; Free Body Diagrams; Pulleys; Equilibrium of Concurrent Forces; Constraint Equations; Pseudo Force; Static and Kinetic Friction; Laws of Friction; Rolling Friction; Centripetal Force and its applications; Impulse; Collision

### India Study Solution MCQ Test Series – Set 4 (Q. No 31-40)

Question 31: When a constant force is applied to a body, it moves with uniform:
a. Acceleration
b. Velocity
c. Speed
d. Momentum

Question 32: A box ‘A’ is lying on the horizontal floor of the compartment of a train running along horizontal rails from left to right. At time ‘t’, it decelerates. Then the reaction R by the floor on the box is given best by:

Question 33: A lift of mass 1000 kg is moving upwards with an acceleration of 1m/s2. The tension developed in the string, which is connected to lift? (g = 9.8m/s2)
a. 9800 N
b. 10800 N
c. 11000 N
d. 10000 N

Question 34: A body of mass 1 kg rests on a smooth surface. Another body B of mass 0.2 kg is placed over A as shown. The coefficient of static friction between A and B is 0.15. B will being to slide on A if a pulled with a force greater than –

Question 35: If the coefficient of friction of a plane inclined at 300 is 0.4, then the acceleration of the body sliding freely on it, is: (g = 9.8m/s2)
a. 1. 51 m/s2
b. 3. 54 m/s2
c. 9.8 m/s2
d. 4.9 m/s2

Question 36: A marble block of mass 2 kg lying on ice when given a velocity of 6m/s is stopped by friction in 10 s. Then, the coefficient off friction is:
a. 0.02
b. 0.03
c. 0.06
d. 0.01

Question 37: A block is moving up an inclined plane of inclination θ = 300 with a velocity 5 m/s. If it stops after 0.5 s then what is the value of coefficient of friction (µ) ?

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Question 38: A man getting down a running bus, fails forward because –
a. Due to inertia of rest, road is left behind and man reaches forward
b. Due to inertia of motion upper part of body continues to be in motion in forward direction while feet come to rest as soon as they touch the road
c. He leans forward as a matter of habit
d. Of the combined effect of all the three factors stated in a, b and c

Question 39: A dynamometer D, is connected with two bodies of mass M = 6 kg and m = 4 kg. If two forces F = 20 N and F = 10 N are applied on masses according to figure then reading of the dynamometer will be –
a. 10 N
b. 20 N
c. 6 N
d. 14 N

Question 40: Two masses M1 and M2 connected by means of a string which is made to pass over light, smooth pulley are in equilibrium on a fixed smooth wedge as shown in figure. If θ = 600 and α = 300, the ratio of M1 to M2 is –

<<Prev (Q.No 21 - 30)                 (Q.No 41 - 50) Next>>

## Newton’s Laws of Motion and Friction - Objective questions answers | Test series with solutions

Physics objective questions answers, MCQ Test Series with solutions for NEET, AIPMT, IIT JEE, other Medical and Engineering Entrance Exams; Admission Tests.

### Physics Objective Questions with Solutions | Newton’s Laws of Motion and Friction (Syllabus)

Force and Inertia; Law of Inertia; Newton’s First Law of Motion; Center of Mass; Momentum; Newton’s Second Law of Motion; Impulse; Newton’s Third Law of Motion; Law of Conservation of Linear Momentum and its applications; Variable Mass; Free Body Diagrams; Pulleys; Equilibrium of Concurrent Forces; Constraint Equations; Pseudo Force; Static and Kinetic Friction; Laws of Friction; Rolling Friction; Centripetal Force and its applications; Impulse; Collision
Newton’s Laws of Motion and Friction
Solved Multiple Choice Questions Test Series (MCQ) – Set 3 (Q. No 21-30)

Question 21: Two weights W1 and W2 are suspended from the ends of a light string passing over a smooth fixed pulley. If the pulley is pulled up at an acceleration g. The tension in the string will be:

Question 22: A body of mass 3 kg hits a wall at an angle of 600 and with speed of 10 m/s and returns at the same angle. The impact time is 0.2 sec. Calculate force exerted on the wall:

a. 150√3 N
b. 100 N
c. 50√3 N
d. 75√3 N

Question 23: Ten coins each of mass 10 gm are placed one above the other. The reaction force exerted by 7th coin from the bottom on the 8th coin is –
a. 0.3 N
b. 0.2 N
c. 0.4 N
d. 0.7 N

Question 24: Consider the situation shown in fig. The wall is smooth but the surface of A and B in contact are rough. The friction on B due to A in equilibrium –
a. Is upward
b. Is downward
c. Is zero
d. The system cannot remain in equilibrium

Question 25: A particle moves in the xy plane under the action of a force F such that the value of its linear momentum (P) at any time t is, Px = 2 cos t, Py = 2 sin t. The angle θ between P and F at that time t will be:
a. 00
b. 300
c. 900
d. 1800
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Question 26: A rocket of mass 6000 kg is set for vertical firing. If the exhaust speed is 1000m/sec. The rate of mass of gas ejected to supply a thrust needed to give the rocket an initial upward acceleration of 20.2 m/s2 is –
a. 150 kg/sec
b. 160 kg/sec
c. 28 kg/sec
d. 180 kg/sec

Question 27: If the coefficient of friction of a surface is √3, then the angle of inclination of the plane to make a body on it just to slide, is –
a. 300
b. 450
c. 600
d. 7500

Question 28: In the shown in the figure, the pulley has a mass 3m. Neglecting friction on the contact surface, the force exerted by the supporting rope AB on the ceiling is:
a. 6 mg
b. 3 mg
c. 4 mg
d. None of the above

Question 29: Two bodies of masses 4 kg and 16 kg at rest to act upon by same force. The ratio of times required to attain the same speed is –
a. 1: 1
b. 4: 1
c. 1: 4
d. 1: 2

Question 30: Two masses A and B 0f 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 in the figure. The coefficient of friction of A with the table is 0.2. The minimum mass of C that may be placed on A to prevent it from moving is equal to:
a. 15 kg
b. 10 kg
c. 5 kg
d. 20 kg

Newton's Laws of Motion, Friction - More Practice Questions

## Physics solved objective questions, test series: Newton’s Laws of Motion and Friction

Physics guide, solved MCQ test series, objective questions for preparing NEET, IITJEE, Joint Entrance Exams and other competitions.
Newton’s Laws of Motion and Friction (Topics):
Force and Inertia; Law of Inertia; Newton’s First Law of Motion; Center of Mass; Momentum; Newton’s Second Law of Motion; Impulse; Newton’s Third Law of Motion; Law of Conservation of Linear Momentum and its applications; Variable Mass; Free Body Diagrams; Pulleys; Equilibrium of Concurrent Forces; Constraint Equations; Pseudo Force; Static and Kinetic Friction; Laws of Friction; Rolling Friction; Centripetal Force and its applications; Impulse; Collision

### Physics: Newton’s Laws of Motion and Friction

Multiple Choice Questions (MCQs) – Set 2 (Q. No. (11-20)

Question 11: Two masses are connected by a string which passes over a pulley accelerating upward at a rate A as shown. If a1 and a2 be the acceleration of bodies 1 and 2 respectively then:

Question 12: The pendulum hanging from the ceiling of a railway carriage makes angle 300 with the vertical, when it is accelerating. The acceleration of the carriage is:

Question 13:Two particles A and B, each of mass m, kept stationary by applying a horizontal force F = mg on particle B as shown in fig. Then –
a. Tan β = 2 tan α     b. 2T1 = 5T2     c. T1 √2 = T2 √5    d. None of these
(1) a, b                     (2) b, c             (3) c, d                 (4) a, c

Question 14: Action and reaction –
a. Act on two different objects
b. Have opposite direction
c. Have equal magnitude
d. All of these

Question 15: Two block A and B placed on a plane surface as shown in the figure. The mass of block A is 100 kg and that of block B is 200 kg. Block A is tied to a stand and block B is pulled by a force F. If the coefficient of friction between the surfaces of A and B is 0.2 and the coefficient of friction between B and the plane is 0.3 then for the motion of B the minimum value of F will be –

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Question 16: If a block moving up an inclined plane at 300 with a velocity of 5 m/s, stops after 0.5 s, then, coefficient of friction will be nearly –
a. 0.5
b. 0.6
c. 0.9
d. 1.1

Question 17: A fireman wants to slide down a rope. The breaking load for the rope is 3/4th of the weight of the man. With what minimum acceleration should the fireman slide down? Acceleration due to gravity is g.

Question 18: A 13 m ladder is placed against a smooth vertical wall with its lower end 5 m from the wall. What should be the maximum coefficient of friction between ladder and floor, so that it remains in equilibrium?
a. 0.36
b. 0.72
c. 0.21
d. 0.52

Question 19: A bird is sitting in an air tight cage. The cage is put on a weighing machine. It reads W1. The bird now starts flying. The weighing machine reads W2. Then:
a. W1< W2
b. W2< W1
c. W1 = W2
d. None

Question 20: A body of mass M is kept on a rough horizontal surface (friction coefficient = µ). A person is trying to pull the body by applying a horizontal force but the body is not moving. The force by the surface on A is F where –