A. 45°
B. 90°
C. 180°
D. 0°
✅ The correct answer is option D.
Work And Energy MCQs
A field in which the work is done in a moving a body along a closed path is zero is called
A. Electric field
B. Conservative field
C. Electromagnetic field
D. Gravitational field
✅ The correct answer is option B.
When a force is parallel to the direction of motion of the body, then work done on the body is
A. Zero
B. Minimum
C. Infinity
D. Maximum
✅ The correct answer is option D.
Which of the following types of force can do no work on the particle on which it acts?
A. Frictional force
B. Gravitational force
C. Elastic force
D. Centripetal force
✅ The correct answer is option D.
If a body a mass of 2 kg is raised vertically through 2m, then the work done will be
A. 38.2 J
B. 392.1 J
C. 39.2 J
D. 3.92 J
✅ The correct answer is option C.
An elevator weighing 3.5 x 10-6 N is raised to a height of 1000 m in the absence of friction, the work done is
A. 3.5 x 103 J
B. 3.5 x 104 J
C. 3.5 x 106 J
D. 3.5 x 109 J
✅ The correct answer is option D.
The average power and instantaneous power become equal if work is done at
A. Any rate
B. At variable rate
C. At a uniform rate
D. At a high rate
✅ The correct answer is option C.
The relation between horsepower and watt is
A. 1 hp = 546 watts
B. 1 hp = 746 watts
C. 1 hp = 1000 watts
D. 1 hp = 946 watts
✅ The correct answer is option B.
Proton-electron neutron and particles have the same momentum. Which of them have highest K.E?
A. Proton
B. Electron
C. Neutron
D. A-particle
✅ The correct answer is option B.
The slope of the work time graph is equal to
A. Displacement
B. Acceleration
C. Power
D. Energy
✅ The correct answer is option C.