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

Questions
1 One radian is defined to be the angle subtended where the arc length S is exactly equal to the?
A radius of the circle.
B diameter of the circle.
C circumference of the circle.
D half of radius of the circle.

Answer:radius of the circle.
2 To attain maximum range, the projectile must be launched at an angle of?
A 0°
B 45°
C 90°
D 60°

Answer:45°
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3 A body makes a displacement of 4 m due East from a point O and then makes displacement of 3 m due North . Its resultant displacement from O
A 7 m
B 1 m
C 5 m
D 1 . 2 m

Answer:5 m
4 A frictional track ABCDE ends in a circular loop of radius R, body slides down the track from point A which is at a height h of 5 cm. Maximum value of R for the body to successfully complete the loop is:
A 15/4 cm
B 5 cm
C 10/3 cm
D 2 cm

Answer:2 cm
5 The dimensional formula for angular velocity is
A T-1
B LT-1
C L-1T-1
D L-1T

Answer:T-1
6 The displacement of a particle is given by the expression y = at + bt2 , where a and b are constants . The acceleration of the particle at any instant is given by
A 2b
B zero
C a + 2b
D at + 2b

Answer:2b
7 Small angle produces?
A straight trajectory
B steep trajectory
C flat trajectory
D high trajectory

Answer:flat trajectory
8 Centripetal acceleration is the acceleration which is always directed towards the centre of the?
A Parallelogram
B square
C circle
D ellipse

Answer:circle
9 The angle between centripetal acceleration and tangential acceleration is?
A 180°
B 0°
C 90°
D 45°

Answer:90°
10 A bucket containing water is tied to one end of a rope of length 2.5 m and rotated about the other end in a vertical circle. What should be the minimum velocity of the bucket at the highest point, so that the water in the bucket will not spill? (g = 10 m/s2)
A 7 m/s
B 4 m/s
C 2.5 m/s
D 5 m/s

Answer:5 m/s
11 Which is a constant for a freely falling object?
A displacement
B velocity
C acceleration
D speed

Answer:acceleration
12 The total flight requires a time that is?
A four times the time necessary to reach the maximum height.
B thrice the time necessary to reach the maximum height
C equal to the time necessary to reach the maximum height.
D twice the time necessary to reach the maximum height

Answer:twice the time necessary to reach the maximum height
13 One ° (1°) is equal to?
A 0.1745 rad
B 0.01745 rad
C 0.001745 rad
D 7.1745 rad

Answer:0.01745 rad
14 The path followed by a projectile is called its?
A Territory
B Treasury
C Tractor
D Trajectory

Answer:Trajectory
15 A cyclist goes round a circular path of circumference 343 m in s. The angle made by him, with the vertical is
A 44°
B 42°
C 43°
D 45°

Answer:45°
16 Centripetal acceleration is the acceleration which is always directed towards the centre of the?
A Parallelogram
B square
C circle
D ellipse

Answer:circle
17 A body of mass m performing UCM with frequency n along the circumference of circle having radius r, force is given by
A 4pnm2
B 4p2n2m
C p2n2mr
D 1/2 pnm2

Answer:4p2n2m
18 The horizontal distance from the origin (x=O, y=O) to the point where the projectile returns (x = R, y=O) is called?
A Vertical component of the projectile
B Trajectory of the projectile
C maximum height of the projectile
D Range of the projectile

Answer:Range of the projectile
19 A cyclist is moving in a circular track of radius 80 m, with a velocity of 36 km/hour. In order to keep his balance, he has to lean inwards from the vertical through an angle q. If g = 10 m/s2, then q is given by
A tan-1 (1/8)
B tan-1 (1/4)
C tan-1 (4)
D tan-1 (2)

Answer:tan-1 (1/8)
20 A particle revolves round a circular path. The acceleration of the particle is
A zero
B along the circumference of the circle
C along the tangent
D along the radius

Answer:along the radius

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