CBSE Class 11 Physics Chapter 5 Laws of Motion Multiple Choice Questions with Answers. MCQ Questions Class 11 Physics Laws of Motion with Answers was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 11 Physics Laws of Motion MCQs with Answers to know their preparation level.
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MCQ Questions Class 11 Physics Laws of Motion with Answers - Set - 4
Question 1:
A body of mass 5 kg explodes at rest into three fragments with masses in the ratio 1 : 1 : 3. The fragments with equal masses fly in mutually perpendicular directions with speeds of 21 m/s. The velocity of heaviest fragment in m/s will be
(a) 7 2
(b) 5 2
(c) 3 2
(d) 2
Correct Answer – (A)
Question 2 :
A shell, in flight, explodes into four unequal parts.
Which of the following is conserved?
(a) Potential energy
(b) Momentum
(c) Kinetic energy
(d) Both (a) and (c).
Correct Answer – (B)
Question 3 :
An explosion blows a rock into three parts. Two parts go off at right angles to each other. These two are, 1 kg first part moving with a velocity of 12 m s–1 and 2 kg second part moving with a velocity 8 m s–1. If the third part flies off with a velocity of 4 m s–1, its mass would be
(a) 7 kg
(b) 17 kg
(c) 3 kg
(d) 5 kg
Correct Answer – (D)
Question 4 :
An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of 12 m s–1 and the second part of mass 2 kg moves with 8 m s–1 speed. If the third part flies off with 4 m s–1 speed, then its mass is
(a) 7 kg
(b) 17 kg
(c) 3 kg
(d) 5 kg
Correct Answer – (D)
Question 5 :
A body of mass M hits normally a rigid wall with velocity V and bounces back with the same velocity. The impulse experienced by the body is
(a) MV
(b) 1.5MV
(c) 2MV
(d) zero
Correct Answer – (C)
MCQ Questions Class 11 Physics Laws of Motion with Answers
Question 6 :
A man fires a bullet of mass 200 g at a speed of 5 m/s.
The gun is of one kg mass. By what velocity the gun rebounds backward?
(a) 1 m/s
(b) 0.01 m/s
(c) 0.1 m/s
(d) 10 m/s.
Correct Answer – (A)
Question 7 :
A mass of 1 kg is thrown up with a velocity of 100 m/s. After 5 seconds, it explodes into two parts. One part of mass 400 g comes down with a velocity 25 m/s. The velocity of other part is (Take g = 10 m s–2)
(a) 40 m/s
(b) 80 m/s
(c) 100 m/s
(d) 60 m/s
Correct Answer – (C)
Question 8 :
A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s. Each bullet has a mass of 10 g with a muzzle velocity of 800 m s–1. The final velocity acquired by the person and the average force exerted on the person are
(a) – 0.08 m s–1, 16 N
(b) – 0.8 m s–1, 8 N
(c) – 1.6 m s–1, 16 N
(d) – 1.6 m s–1, 8 N
Correct Answer – (A)
Question 9 :
A 0.5 kg ball moving with a speed of 12 m/s strikes a hard wall at an angle of 30° with the wall. It is reflected with the same speed at the same angle. If the ball is in contact with the wall for 0.25 seconds, the average force acting on the wall is
(a) 96 N
(b) 48 N
(c) 24 N
(d) 12 N
Correct Answer – (C)
Question 10 :
A 600 kg rocket is set for a vertical firing. If the exhaust speed is 1000 m s–1, the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is
(a) 117.6 kg s–1
(b) 58.6 kg s–1
(c) 6 kg s–1
(d) 76.4 kg s–1
Correct Answer – (A)
- NCERT Solutions Class 11 Physics Chapter 1 : Physical world
- NCERT Solutions Class 11 Physics Chapter 2 : Units And Measurements
- NCERT Solutions Class 11 Physics Chapter 3 : Motion In A Straight Line
- NCERT Solutions Class 11 Physics Chapter 4 : Motion In A Plane
- NCERT Solutions Class 11 Physics Chapter 5 : Laws of Motion
- NCERT Solutions Class 11 Physics Chapter 6 : Work Energy Power
- NCERT Solutions Class 11 Physics Chapter 7 : Rotational-Motion
- NCERT Solutions Class 11 Physics Chapter 8 : Gravitation
- NCERT Solutions Class 11 Physics Chapter 9 : Mechanical Properties of Solids
- NCERT Solutions Class 11 Physics Chapter 10 : Mechanical Properties of Fluids
- NCERT Solutions Class 11 Physics Chapter 11 : Thermal Properties of Matter
- NCERT Solutions Class 11 Physics Chapter 12 : Thermodynamics
- NCERT Solutions Class 11 Physics Chapter 13 : Kinetic Theory
- NCERT Solutions Class 11 Physics Chapter 14 : Oscillations
- NCERT Solutions Class 11 Physics Chapter 15 : Waves
