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

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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

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

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

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

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

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

Answer:4
7 Motion in a plan
A -3/2
B 3/2
C -1
D 0

Answer:-3/2
8 Acceleration due to gravity
A polar vector
B a scalar
C a vector
D None of these

Answer:polar vector
9 The resultant of A × 0 will be equal to
A zero vector
B zero
C A
D unit vector

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

Answer:can never be zero
11 Motion in a Plane
A 10 t
B 5 t
C 3 t
D 2 t

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

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

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

Answer:not a constant vector
15 Motion in a Plane
A 45°
B 180°
C 0°
D 90°

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°

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

Answer:constant velocity
18 Motion in a Plane

Motion in a Plane

A (a)
B (b)
C (c)
D (d)

Answer:(a)
19 Motion in a Plane
A θ=120°
B θ=90°
C θ=0°
D None of these

Answer:θ=120°
20 Motion in a Plane
A 7√2 units
B 8.5 units
C 7 units
D 10 units

Answer:7√2 units

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