In This Post we are providing Chapter-4 Motion in a Plane NCERT MCQ for Class 11 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.
NCERT MCQ ON MOTION IN A PLANE
Question 1.
Three vectors A, B and C satisfy the relation A.B = 0 and A.C = 0. The vector A is parallel to
(a) B
(b) C
(c) B × c
(d) B.C
Answer: (c) B × c
Question 2.
What is the minimum number of unequal forces whose resultant will be zero?
(a) 1
(b) 2
(c) 3
(d) 4
Answer: (c) 3
Question 3.
A body travelling in a circular path at uniform speed has :
(a) constant velocity
(b) tangential acceleration
(c) inward acceleration
(d) outward acceleration
Answer: (c) inward acceleration
Question 4.
When a disc containing mercury and water is rotated rapidly about a vertical axis, then the outermost place in the disc will be taken by:
(a) water
(b) mercury
(c) sometimes water and sometimes mercury
(d) none of these.
Answer: (b) mercury
Question 5.
The resultant of two forces P and Q is R. If one of the forces is reversed in direction, then the resultant becomes S. Then for the identity R² + S² = 2(P² + Q²) to hold good
(a) The forces are collinear
(b) The forces act as right angles to each other
(c) The forces are inclined at 45° to each other
(d) The forces can have any angle of inclination between them
Answer: (d) The forces can have any angle of inclination between them
Question 6.
A bus is moving on a straight road towards north with a uniform speed of 50 kmh-1 when it turns left through 90°. If the speed remains unchanged after turning, the increase in the velocity of the bus in the turning process is :
(a) zero
(b) 50 kmh-1
(c) 70.7 kmh-1 along south-west direction
(d) 70.7 lcmh-1 along north-west direction
Answer: (c) 70.7 kmh-1 along south-west direction
Question 7.
Two bullets are fired simultaneously horizontally and with different speeds from the same place. Which bullet will hit the ground first?
(a) The slower one
(b) The faster one
(c) Both will reach simultaneously
(d) Depends on the masses
Answer: (c) Both will reach simultaneously
Question 8.
A particle is acted upon by a force of constant magnitude, which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that:
(a) its velocity is constant
(b) its acceleration is constant
(c) its kinetic energy is constant
(d) it moves in a circular path
Answer: (c) and (d).
Question 9.
The muzzle speed of a certain rifle is 330 ms-1. At the end of one second, a bullet fired straight up into the air will travel a distance of:
(a) 330 m
(b) (330 – 4.9) m
(c) (330 – 9.8) m
(d) (330 + 4.9) m
Answer: (b) (330 – 4.9) m
Question 10.
If a body A of mass M is thrown with velocity v at angle of 30° to the horizontal and another body B of the same mass is thrown with the same speed at an angle of 60° to the horizontal, the ratio of the horizontal ranges of A and B will be
(a) 1 : 3
(b) 1 : 1
(c) √3 : 1
(c) 1 : √3
Answer: (b) 1 : 1
Question 11.
One body is dropped while a second body is thrown downwards with an initial velocity of 1 ms-1 simultaneously. The separation between these is 18 m after a time
(a) 4.5 s
(b) 9 s
(c) 18 s
(d) 36 s
Answer: (c) 18 s
Question 12.
A boat which has the speed of 5 kmh-1 still water crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of the river water is
(a) 3 kmh-1
(b) 4 kmh-1
(c) 41−−√ kmh-1
(d) 1 kmh-1
Answer: (a) 3 kmh-1
Question 13.
Which of the following vectors is perpendicular to i^ Pcos 9 +
(a) i^ Pcos θ + j^ Qsin θ
(b) i^ Qcos θ – j^ Psin θ
(c) i^ Psin θ + j^ Qcos θ
(d) i^ Qsin θ – j^Pcos θ
Answer: (d) i^ Qsin θ – j^Pcos θ
Question 14.
Which of the following operations between the two vectors can yield a vector perpendicular to either of them
(a) addition
(b) subtraction
(c) multiplication
(d) division
Answer: (c) multiplication
Question 15.
Which of the following is the essential characteristic of a projectile?
(a) Zero velocity at the highest point
(b) Initial velocity inclined to the horizontal
(c) Constant acceleration perpendicular to the velocity
(d) None of these
Answer (d) None of these
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