NCERT Solutions for class 11 Physics | Chapter 4 - Motion in a Plane

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Questions
1 A can filled with water is revolved in a vertical circle of radius 4 metre and the water does not fall down. The time period of revolution will be
A 4 sec
B 10 sec
C 8 sec
D 1 sec

Answer:4 sec
2 A car of mass 1000 kg moves on a circular road with a speed of 20 m/s. Its direction changes by 90o after traveling 628 m on the road. The centripetal force acting on the car is
A 1000 N
B 1500 N
C 500 N
D 2000 N

Answer:1000 N
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3 In projectile a body moves with?
A constant horizontal component of velocity
B constant vertical component of velocity
C both changing horizontal and vertical components of velocity
D horizontal component changing but vertical component of velocity constant.

Answer:constant horizontal component of velocity
4 The change in the velocity vector is either due to change in its magnitude or change in its?
A None of these
B units
C Dimension
D direction

Answer:direction
5 What angle of projection would result in a ball traveling the maximum horizontal distance? (Neglect air resistance)
A 25°
B 90°
C 90°
D 45°

Answer:45°
6 A coin kept on a rotating gramophone disc just begins to slip if its centre is at a distance of 8 cm from the centre of the disc. The angular velocity of the gramophone disc is then doubled. Through what distance, the coin should be shifted towards the centre, so that the coin will just slip?
A 2 cm
B 6 cm
C 16 cm
D 4 cm

Answer:2 cm
7 A car of mass 800 kg moves on a circular track of radius 40 m. If the coefficient of friction is 0.5, then maximum velocity with which the car can move is
A 8 m/s
B 14 m/s
C 12 m/s
D 7 m/s

Answer:14 m/s
8 When an object rotates about a fixed axis, every point in the object moves in a?
A circle whose center is on the axis of rotation
B ellipse whose center is on the axis of rotation
C straight line
D parabolic path

Answer:circle whose center is on the axis of rotation
9 A car is moving with a speed of 30 m/s on a circular path of radius 500 m. Its speed is increasing at the rate of 2 m/s2. The acceleration of the car is
A 2 m/s2
B 9.8 m/s2
C 1.8 m/2
D 2.7 m/s2

Answer:2.7 m/s2
10 In the analysis of projectile motion, it is assumed that effect of air resistance is?
A None of these
B negligible
C important
D considerable

Answer:negligible
11 The path of a particle is given by the expression y = at + bt2 , where a and b are constants . Y is the displacement at time t . Its velocity at any instant is given by
A a + 2bt
B zero
C 2bt
D at

Answer:a + 2bt
12 In projectile a body moves with?
A constant horizontal component of velocity
B constant vertical component of velocity
C both changing horizontal and vertical components of velocity
D horizontal component changing but vertical component of velocity constant.

Answer:constant horizontal component of velocity
13 A body of mass 100 gram, tied at the end of a string of length 3 m rotates in a vertical circle and is just able to complete the circle. If the tension in the string at its lowest point is 3.7 N, then its angular velocity will be ______ (g = 10 m/s2)
A 2 rad/s
B 1 rad/s
C 4 rad/s
D 3 rad/s

Answer:3 rad/s
14 A car sometimes overturns while taking a turn. When it overturns, it is
A the inner wheel which leaves the ground first
B either inner wheel or the outer wheel leaves the ground
C both the wheel leave the ground simultaneously
D the outer wheel which leaves the ground first

Answer:the inner wheel which leaves the ground first
15 Choose the only vector quantity from the following :
A Density
B Mass
C Acceleration
D Volume

Answer:Acceleration
16 Choose the only scalar quantity from the following :
A Velocity
B Acceleration
C Speed
D Displacement

Answer:Speed
17 A book is pushed with an initial horizontal velocity of 5.0 meters per second off the top of a desk. What is the initial vertical velocity of the book?
A 10. m/s
B 0 m/s
C 50 m/s
D 2.5 m/s

Answer:0 m/s
18 A body is allowed to slide on a frictional less track from rest under-gravity. The track ends in a circular loop of diameter D. What should be the minimum height of the body in terms of D, so that it may successfully complete the loop?
A D
B 4/5 D
C 5/4 D
D 2D

Answer:5/4 D
19 If we drop a ball in horizontal direction than its motion will no longer be straight downward but will be at some?
A distance to the vertical.
B angle to the vertical.
C height to the vertical.
D steps to the vertical.

Answer:angle to the vertical.
20 A particle of mass m is moving in a horizontal circle of radius R with uniform speed v. When it moves from one point to a diametrically opposite point its
A momentum does not change
B kinetic energy changes by Mv2
C momentum changes by 2 Mv2
D Oops ! You didn't attempt this question

Answer:momentum does not change

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