# 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 –

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