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.

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

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