Solved Physics Practice Questions and Test Series for NTSE, KVPY, Medical and Engineering Entrance Exams from chapter Work, Energy and Power

Work, Energy and Power - Solved MCQ Test Series

Here you get carefully prepared 10 MCQ Practice Questions (Q.No.31 - 40) in each India Study Solution Test Series with hints & solutions (given at the end) from the Physics chapter - Work, Energy and Power.

Also study:

• Work,Energy and Power Test Series Set-1: Q No (1-10)
• Work, Energy and Power Test Series Set-2: Q No (11-20)
• Work, Energy and Power Test Series Set-3: Q No (21-30)

Practising with our test series questions will certainly enhance your level of confidence for NEET-UG, JEE Main & Advanced (IIT) AIIMS, JIPMER, COMEDK, WBJEE, MBBS Admission Tests, Engineering Entrance Exams, NEST, NTSE, KVPY and other such competitive exams.

India Study Solution

Solved MCQ Test Series – Set 4 (Q. No. 31-40) for IIT JEE, NEET, KVPY, NTSE

Question 31: A boy is swinging on a swing such that his lowest and highest positions are at heights of 2m and 4.5m respectively. His velocity at the lowest position is,

a. 2.5ms^–1   b. 7ms^–1

c. 14ms^–1    d. 20ms^–1

Question 32: The kinetic energy of a body of mass 2 kg and momentum of 2 Ns is,

a. 1J   b. 2J   c. 3J   d. 4J  

Question 33: The diagram below shows Potential Energy vs Displacement curve for one dimensional conservative field. Force at points ‘A’ and ‘B’ are respectively -

a. Positive, Positive

b. Negative, Positive

c. Negative, Negative

d. Positive, Negative  

Question 34: A particle, which is constrained to move along the x-axis, is subjected to a force in the same direction which varies with the distance ‘x’ of the particle from the origin as F(x) = –kx + ax³.

Here ‘k’ and ‘a’ are positive constants. For x ≥ 0, the functional form of the potential energy U(x) of the particle is,

Question 35: A solid cylinder of mass 3kg is rolling on a horizontal surface with velocity 4 m/s. It collides with a horizontal spring of force constant 200N/m. The maximum compression produced in the spring will be -  

a. 0.7m      b. 0.2m

c. 0.5m      d. 0.6m

Question 36: A pump of 200W power is lifting 2kg water per second from an average depth of 10m. The velocity with which the water comes out of the pump is, (g = 9.8 ms^–2)

a. 2 ms^–1    b. 2.5 ms^–1

c. 4 ms^–1    d. 3 ms^–1  

Question 37: Two particles of masses ‘m’ and ‘2m’ have same momentum. If the kinetic energies of the two particles are E₁ and E₂ respectively then what should the ratio of E₁ : E₂

a. 1 : 2     b. 2 : 1

c. 1 : √2   d. 1 : 4

Question 38: The kinetic energy (K) of a body of mass ‘m’ moving along a circle of radius ‘r’ depends on  the distance covered by the body as, K = as², where ‘a’ is a constant. The centripetal force acting on the body as a function of ‘s’ is -

a. 2as²/r      b. 2as/r

c. as²/r        d. 4as²/r  

Question 39: If a force ‘F’ is applied on a body and it moves with a velocity ‘v’ the power will be,

a. Fv   b. F/v   c. F/v²   d. Fv²  

Question 40: A shell is fired from cannon, which explodes in mid air, then -

a. its total KE increases

b. its total momentum increases

c. its total momentum decreases

d. there will be no change in momentum or KE

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Solutions of Physics MCQ Test Series – Set 4 (Q. No.31–40)

Answer 31: b. Answer 32: a. (Hint: KE = p²/2m = 1).

Answer 33: a. Answer 34: d.

Answer 35: d. Answer 36: a.

Answer 37: b (Hint: e = p²/(2m). Since, momenta of the two particles are same,

then E µ 1/m.

Now, E₁ : E₂ = m2 : m1 = 2 : 1).

Answer 38: b. Answer 39: a. Answer 40: a.

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Work, Energy and Power - Solved Test Series, Questions Bank for NEET, AIIMS, JEE Main and Advanced, NEST, Admission Tests

India Study Solution - Physics Guide 

Work, Energy and Power

In continuation of Test Series Set 1 (Q. No. 1-10) and Test Series Set 2 (Q. No. 11-20), Test Series Set 4 (Q. No. 31-40) here you have carefully selected 10 MCQ practice questions with hints & solutions (given at the end) from the Physics chapter - Work, Energy and Power.

Syllabus for IITJEE, NEET:                                                                      

Work done by a constant force and by a variable force, Unit of Work, Energy and Power, Work Energy, Theorem. Elastic and in-elastic collisions in one and two dimensions, Notions of Work and Energy, Law of Conservation of Energy, Potential and Kinetic Energies, Gravitational Potential Energy, and its conversion to Kinetic energy, Potential Energy of a spring. Conservative and Non-conservative Forces, Different forms of Energy, Three types of Equilibrium, Mass-Energy equivalence. Power.   

India Study Solution

Solved MCQ Test Series – Set 3 (Q. No. 21-30)

Question 21: A particle is projected at 60^O to the horizontal with a kinetic energy K. The kinetic energy at the highest point is,  

a. K     b. Zero

c. K/4  d. K/2  

Question 22: Two springs with spring constants k₁ and k₂ (k1 ¹ k₂) are extended by the same force. If their elastic potential energies are U₁ and U₂, then, U₂ will be -

Question 23: A particle of mass 0.1kg is subjected to a force that varies with distance as shown in the adjacent diagram. If the particle starts its journey from rest at x = 0, its velocity at x = 12m will be -

a. 0 m/s           b. 20√2 m/s  

c. 20√3 m/s     d. 40 m/s  

Question 24: A ball released from a height 20m, hits the ground and rebounds to a height of 16m. The percentage loss of energy during collision is, 

a. 20%  b. 40%  c. 25%  d. 75%.  

Question 25: A block of mass 50kg is projected horizontally on a rough horizontal floor. The coefficient of friction between the block and the floor is 0.1. The block strikes a light spring of stiffness k = 100N/m with a velocity 2m/s. The maximum compression of the spring is,  

a. 1m    b. 2m

c. 3m    d. 4m  

Question 26: A uniform meter scale of mass 2kg is suspended from one end. If it is displaced through an angle 60^O from the vertical, the increase in its potential energy is,  

a. 4.9J   b. 9.8J   c. 9.8√3J   d. 4.9(2 – √3)J  

Question 27: A rigid body of mass ‘m’ is moving in a circle of radius ‘r’ with a constant speed ‘v’. The force on the body is mv²/r and is directed towards the center. What will be the work done by this force in moving the body over half the circumference of the circle.

Question 28: A ball ‘A’ is released from rest when the block ‘B’ is on the ground (see adjacent fig.). For the block ‘B’ of mass ‘M’ to remain in contact with ground, the minimum mass of ‘A’ must be -

a. 2M     b. M

c. M/2    d. None of these.  

Question 29: A body of mass 1kg is thrown upwards with a velocity 20ms^–1. It momentarily comes to rest after attaining a height of 18m. How much energy is lost due to air friction? (g = 10ms^–2)  

a. 20J    b. 30J

c. 40J    d. 10J  

Question 30: A ball is released from certain height and rebounds after hitting the ground. If it loses 50% of its KE on striking the ground then it will attain a height again equal to -

a. one fourth of the initial height

b. three fourth of the initial height

c. half of the initial height

d. none of these.  

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 Work, Energy and Power  - More Practice Questions, Test Series 

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Work, Energy and Power - Test Series and Practice Questions with Hints, Solutions for NEET (AIIMS, JIPMER), JEE Main, JEE Advanced (IIT), NEST

Work, Energy and Power

Solved Test Series for NEET, JEE Main & Advanced, IIT, AIIMS, JIPMER, WBJEE : Work, Energy and Power

Here you get carefully prepared another Set of 10 MCQ practice questions (Q.No.11 - 20) in our each Test Series with hints & solutions (given at the end) from the Physics chapter - Work, Energy and Power.

Also study: Work, Energy and Power - Solved Test Series Set 1 (Question 1 - 10) and Test Series Set 2 (Question 21 - 30) 

Practising with our test series questions will certainly enhance your level of confidence for NEET-UG, JEE Main & Advanced (IIT) AIIMS, JIPMER, COMEDK, WBJEE, MBBS Admission Tests, Engineering Entrance Exams, NEST and other such competitive exams.

Syllabus :

Work done by a constant force and by a variable force, Unit of Work, Energy and Power, Work Energy, Theorem. Elastic and in-elastic collisions in one and two dimensions, Notions of Work and Energy, Law of Conservation of Energy, Potential and Kinetic Energies, Gravitational Potential Energy, and its conversion to Kinetic energy, Potential Energy of a spring. Conservative and Non-conservative Forces, Different forms of Energy, Three types of Equilibrium, Mass-Energy equivalence. Power.   

India Study Solution

Solved MCQ Test Series – Set 2 (Q. No. 11-20)

Question 11: The potential energy of a particle varies with distance ‘x’ as shown in the graph below.

The force acting on the particle is zero at -

a. C         b. B

c. B & C  d. A & D

Question 12: A box of mass 1kg is pulled on a horizontal plane of length 1m by a force of 8N then it is raised vertically to a height of 2m, the net work done is,

a. 28J    b. 8J

c. 18J    d. None of the above

Question 13: Two bodies of masses m1 and m2 have equal momenta. Their K.E. are in ratio -

a. √m₂ : √m₁   

b. m₁ : m₂

c. m₂ : m₁

d. m₁² : m₁²

Question 14: The potential energy of a long spring when stretched by 2cm is ‘U’. If the same spring is stretched by 8cm the potential energy stored in it is -  

a. 4U    b. 8U

c. 16U  d. U/4

Question 15: Work done by frictional force is always -

a. zero             b. negative

c. positive        d. may be either positive, negative or zero

Question 16: The relationship between force and position is shown in the adjacent figure. The work done by the force in displacing a body from x = 1cm to x = 5cm is,

a. 20 ergs    b. 60 ergs

c. 70 ergs    d. 700 ergs

Question 17: When momentum of a body is increased by 200%, its kinetic energy also increases by -

a. 200%      b. 400%

c. 350%      d. 800%

Question 18: Velocity - Time graph of a particle mass 2 kg moving in a straight line is as shown in figure. Work done by all the forced on the particle is -  

a. 400J

b. – 400J

c. – 200J

d. 200J.

Question 19: A spring of force const 800 N/m is extended by 5cm. The work done in extending it from 5cm to 15cm is -   

a. 16J     b. 8J

c. 32J     d. 24J

Question 20: The average power required to lift a 100kg mass through a height of 50m in approximately 50 seconds would be -

a. 50J/s    b. 5000J/s

c. 100J/s  d. 980J/s

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Physics Solutions for NEET, JEE Main, IIT, AIIMS, JIPMER

Work, Energy and Power

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Hints / Solutions of Physics MCQ Test Series – Set 2 (Q. No.11–20)

Answer 11: c. (dU/dx = 0 at B & C). Answer 12: a. Answer 13: d.

Answer 14: c. Hint:

Answer 15: d. Answer 16: a. Answer 17: d. Answer 18: b.

Answer 19: b.

 

Answer 20: d.

(Hint: Average Power = (100 x 9.8 x 50) ÷ 50 = 980 J/s)

 Work, Energy and Power  - More Practice Questions, Test Series 

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