# Motion in a Plane VBQs Class 11 Physics

VBQs Motion in a Plane Class 11 Physics with solutions has been provided below for standard students. We have provided chapter wise VBQ for Class 11 Physics with solutions. The following Motion in a Plane Class 11 Physics value based questions with answers will come in your exams. Students should understand the concepts and learn the solved cased based VBQs provided below. This will help you to get better marks in class 11 examinations.

## Motion in a Plane VBQs Class 11 Physics

Question. A river (width = 200 m) is flowing at a speed of 3 km/h. A man swims across the river along the shortest path and swims back the same way. If the velocity of swimming of man is 5 km/h in still water then time taken by the man for his round trip is
(a) 1/10 h
(b) 1/20 h
(c) 1/40 h
(d) 1/60 h

A

Question. A fighter plane moving with velocity v horizontally drops a bomb from height H. The horizontal range at which bomb will strike the ground is

(a) 2H/g
(b) 2H/gv
(c) v√2H/g
(d) √H/2g

C

Question. A particle is thrown horizontally from the top of a tower of height H with velocity v. Time taken by it to hit the ground is T. If another particle is thrown horizontally from the same point with speed 2v, then time taken by it to reach the ground is
(a) T
(b) 2T
(c) T/2
(d) 2 T

A

Question. Unit vector of a vector A = 3iˆ + 8 jˆ − kˆ is
(a) A/ √74
(b) A/ √72
(c) A
(d) Zero

A

Question. The magnitude of resultant of two forces f̅1 and f̅2 reach of magnitude 10 N as shown in figure is
(a) F√3
(b) F/√3
(c) F
(d) F/√3/2

C

Question. Six persons are standing of a regular hexagon of side ‘a’. Each person starts moving towards the person standing at the adjacent corner with speed ‘v’. They will meet after a time
(a)3v/a
(b) 6v/a
(c) a/6v
(d) 2a/v

D

Question. A projectile is fired with a speed u at an angle ′θ′ with the horizontal. When its direction of motion makes an angle α with the horizontal, its speed at that instant is
(a) u cos α sec θ
(b) u cos θ sec α
(c) u cosα /secθ
(d) u secθ

B

Question. In the situation shown in figure, the three concurrent

A

Question. Stairs of height 1 m and width 2 m are as shown in figure. Minimum horizontal velocity u given to the ball A for which it will hit water directly is

(a) √10 m/s
(b) 2√10 m/s
(c) 4√10 m/s
(d) m/s

B

Question. A body of mass 7 kg at rest explodes into three fragments having masses in the ratio 3 : 3 : 1. The fragments with equal masses fly in mutually perpendicular directions with speed 15 ms–1. What will be the speed of the lighter fragment?
(a) 15 m/s
(b) 15√2 m/s
(c) 45 m/s
(d) 45√2 m/s

D

Question. Two projectile projected from ground towards each other with same initial speed u but at angles θ and (90 – θ) from horizontal. If initial separation between them is equal to range (R) of projection, then time after which they cross same vertical line is
(a) R/cosθ
(b) R/sinθ
(c) R/ u(sinθ + cosθ )
(d) R/ u2(sinθ + cosθ )

C

Question. A fighter plane moving with velocity v horizontally drops a bomb from height H. The horizontal range at which bomb will strike the ground is

(a) 2H/g
(b) 2H/gv
(c) v√2H/g
(d) √H/2g

C

Question. A particle is thrown horizontally from the top of a tower of height H with velocity v. Time taken by it to hit the ground is T. If another particle is thrown horizontally from the same point with speed 2v, then time taken by it to reach the ground is
(a) T
(b) 2T
(c) T/2
(d) 2 T

A

Question. In non-uniform circular motion. If radial vector is rotated by an angle 30°, then the velocity vector is rotated by
(a) 15°
(b) 30°
(c) 60°
(d) 120°

B

Question. A projectile is projected at an angle θ with horizontal with speed u. If air resistance is taken into account, then angle with vertical at time of hitting the ground will be
(a) More than (90 – θ)
(b) Less than (90 – θ)
(c) (90 + θ)
(d) Equal to θ

B

Question. Rain is pouring vertically downward with 10 km/h.
The velocity of the rain with respect to a man running toward north on a horizontal ground with 10 km/h is
(a) 10√2 km/h from north east
(b) 10√2 km/h from north west
(c) 10√2 km/h at 45° with the vertical toward south
(d) 10√2 km/h at 45° with the vertical towards north

C

Question. A particle is thrown with 50 m/s at an angle 60° above horizontal from the top of a tower. If g = 10 m/s2, then change in velocity of the body in first 5 s is
(a) 50 m/s vertically up
(b) 50 m/s vertically down
(c) 50√2 m/s at 45° below horizontal
(d) 50√2 m/s at 45° above horizontal