Free Kinetic Energy MCQs with Answers

• A. equal to its translational kinetic energy
• B. half than its translational kinetic energ
• C. Double than its translational kinetic energy
• D. Four times than its translational kinetic energy

Explanation: The rotational kinetic energy (K_rot) of a hoop is equal to its translational kinetic energy (K_trans).

• A. K.E of hoop= K.E of disc
• B. K.E of hoop= 2 K.E of disc
• C. K.E of hoop= 0.5 K.E of disc
• D. K.E of hoop= 0.4 K.E of disc

Explanation: The rotational kinetic energy (K_rot) depends on both the mass and the distribution of mass around the axis of rotation, but for objects…

• A. Half its translational kinetic energy
• B. twice its translational kinetic energy
• C. four times is translational kinetic energy
• D. The same as its translational kinetic energy

Explanation: For a hoop rolling without slipping, its rotational kinetic energy is equal to its translational kinetic energy.

• A. 1/5 mv^2
• B. 1/2 mv^2
• C. mv^2
• D. 2/5 mv^2

Explanation: Explanation: The correct formula for the rotational kinetic energy of a solid sphere is 2/5 mv^2, where m is the mass of the sphere and v…

• A. A
• B. B
• C. C
• D. D

Explanation: The explanation is given below: If 'E' represents the kinetic energy (K.E) of a body moving in a circle with a radius 'r,' the centripetal…

• A. √gh
• B. √4/3gh
• C. √3/4gh
• D. √5/6gh

Explanation: Here is the explanation of the correct option

• A. 2.8 J
• B. 3.2 J
• C. 3.8 J
• D. 4.4 J

Explanation: The initial momentum of the body is given as 10 kg m/s. Using the definition of momentum, we can find the initial velocity of the body…

• A. 1:2
• B. 1:4
• C. 4:1
• D. 1:1

Explanation: Since K.E is inversely propotional to the mass the ratio of the masses will be inverted and would become 1:4.

• A. ½
• B. ¼
• C. ⅛
• D. ⅙

Explanation: KE=½ mv2KE= ½ m(½v)2KE=⅛ mv2As it can be seen, the fraction reduces from 1/2 to 1/8 which means the Kinetic Energy decreased by 4 times or…

• A. mgh
• B. Zero
• C. 1/2 mv2
• D. 2mgh

Explanation: Ooption B is corrrect.The kinetic energy (KE) of a stone is equal to zero at its maximum height.

• A. A. A rolling ball (kinetic) and a compressed spring (potential)
• B. B. A stationary car (kinetic) and a falling rock (potential)
• C. C. A flowing river (kinetic) and a charged battery (potential)
• D. D. A swinging pendulum at its highest point (kinetic) and a moving car (potential)

Explanation: The correct answer is Option A. Kinetic energy is the energy of motion, exemplified by a rolling ball.

• A. Potential Energy
• B. Thermal Energy
• C. Kinetic Energy
• D. Chemical Energy

Explanation: This is correct because kinetic energy is directly linked to motion and given by (1/2)mv².

• A. Same
• B. 2 times
• C. 4 times
• D. 16 times

Explanation: This is correct because KE ∝ v², so if KE becomes 4 times, then v² becomes 4 ⇒ v = 2v.

• A. 3 J
• B. 6 J
• C. 9 J
• D. 18 J

Explanation: This is correct because KE = ½ × 2 × (3²) = ½ × 2 × 9 = 9 J.

• A. 9:4
• B. 3:2
• C. 4:9
• D. 2:3

Explanation: Formula for kinetic energy is given as ½ mv2. As the masses are the same so, the kinetic energy will be in the ratios of the square of…

• A. 1/2
• B. 1/4
• C. 1/8
• D. 1/6

Explanation: If the speed is halved (keeping the mass same), the kinetic energy decreases, it becomes one-fourth (since kinetic energy is proportional…

• A. Mv2
• B. 2mv2
• C. ½ mv2
• D. 4mv2

Explanation: If the speed of a body is doubled, its kinetic energy becomes four times its original value.

• A. 2 time increased
• B. 2 time decreased
• C. 4 time decreased
• D. 4 time increased

Explanation: Kinetic energy is proportional to the square of velocity, so if velocity doubles, K.E increases 4 times.

• A. 10 J
• B. 0 J
• C. 200 J
• D. 1000 J

Explanation: m=1kg h=10m v=14m/sK.Ef = K.Ei + loss in GP.EK.Ef = 1/2mv2 + m.g.hK.Ef = ½ (1)(14)2 + (1)(10)(10)K.Ef = (0.5)(196) + 100K.Ef =…

• A. 125 J
• B. 250 J
• C. 500 J
• D. 255 J

Explanation: m=10 kgv=5 ms^-1Kinetic energy K.E= ½ mv^2 K.E= ½ [10][5]^2 K.E= 5*25 K.E= 125 J