Class 11 Physics Chapter 4 Motion in a Plane Solved Questions and Answers

Questions

1 A moves with 65 km/h while B is coming back of A with 80 km/h. The relative velocity of B with respect to A is

A 15 km/h

B 145 km/h

C 60 km/h

D 80 km/h

View Answer

Answer:15 km/h

2 The direction of the angular velocity vector is along

A the axis of rotation

B the outward radius

C the inward radius

D the tangent to the circular path

View Answer

Answer:the axis of rotation

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3 A bullet is dropped from the same height when another bullet is fired horizontally. They will hit the ground

A simultaneously

B depends on the observer

C None of these

D one after the other

View Answer

Answer:simultaneously

4 The shape of trajectory of the motion of an object is determined by

A All of these

B initial position

C acceleration

D initial velocity

View Answer

Answer:All of these

5 Which of the following conditions are sufficient and essential for a quantity to be a vector?

A Magnitude, direction, and addition, subtraction multiplication and division by vector laws

B Magnitude, direction and combination of vectors by ordinary rules of algebra

C Magnitude and addition, subtraction, multiplication by ordinary rules of algebra

D Magnitude and direction

View Answer

Answer:Magnitude, direction, and addition, subtraction multiplication and division by vector laws

6 How many minimum number of vectors in different planes can be added to give zero resultant?

A 4

B 5

C 3

D 2

View Answer

Answer:4

A -3/2

B 3/2

C -1

D 0

View Answer

Answer:-3/2

8 Acceleration due to gravity

A polar vector

B a scalar

C a vector

D None of these

View Answer

Answer:polar vector

9 The resultant of A × 0 will be equal to

A zero vector

B zero

C A

D unit vector

View Answer

Answer:zero vector

10 Two vectors A and B lie in a plane, a third vector C lies outside this plane, the sum of these vectors A + B + C (a) can be zero

A can never be zero

B can be zero

C Both

D None of these

View Answer

Answer:can never be zero

A 10 t

B 5 t

C 3 t

D 2 t

View Answer

Answer:10 t

12 A particle moves in a plane with a constant acceleration in a direction different from the initial velocity. The path of the particle is a/an

A parabola

B straight line

C arc of a circle

D ellipse

View Answer

Answer:parabola

13 A boat crosses a river with a velocity of 8 km/h. If the resulting velocity of boat is 10 km/h then the velocity of river water is

A 6 km/h

B 8 km/h

C 10 km/h

D 4 km/h

View Answer

Answer:6 km/h

14 Centripetal acceleration is

A not a constant vector

B a magnitude changing vector

C a constant scalar

D a constant vector

View Answer

Answer:not a constant vector

A 45°

B 180°

C 0°

D 90°

View Answer

Answer:45°

16 For motion in two or three dimensions, the angle between velocity and acceleration is

A Any angle between 0° & 180°

B 180°

C 90°

D 0°

View Answer

Answer:Any angle between 0° & 180°

17 In the projectile motion, if air resistance is ignored, the horizontal motion is at

A constant velocity

B constant retardation

C constant acceleration

D variable acceleration

View Answer

Answer:constant velocity

Motion in a Plane

A (a)

B (b)

C (c)

D (d)

View Answer

Answer:(a)

A θ=120°

B θ=90°

C θ=0°

D None of these

View Answer

Answer:θ=120°

A 7√2 units

B 8.5 units

C 7 units

D 10 units

View Answer

Answer:7√2 units

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