Class 12th Physics MCQ eBook for Work Power & Energy: Physics is the natural science that studies the matter, its motion, and behaviour through space and time, and that studies the related entities of energy and force. Here, we are giving different topics wise Questions and Answers on the physics that will help the readers in the preparation of different examinations. You will see around 15-40 Physics MCQ questions in the paper.
Physics Class 12th MCQ questions for Work Power & Energy plays an important role while preparation of Competitive exams like Railway technician, loco pilot, NDA, CDS and IAS and it is also useful for various Engineering & Medical Entrance examinations like JEE Main, JEE Advanced, NEET, AIIMS and JIPMER etc.
Work: Work can be defined as the transfer of energy. In physics, we say that work is done on an object when you transfer energy to that object. If one object transfers (gives) energy to a second object, then the first object does work on the second object.
Work is the application of a force over a distance. Lifting a weight from the ground and putting it on a shelf is a good example of work. The force is equal to the weight of the object, and the distance is equal to the height of the shelf (W= Fxd).
Energy: Energy can be defined as the capacity for doing work. The simplest case of mechanical work is when an object is standing still and we force it to move. The energy of a moving object is called kinetic energy. For an object of mass m, moving with a velocity of magnitude v, this energy can be calculated from the formula E= 1/2 mv^2.
Power: Power is the work done in a unit of time. In other words, power is a measure of how quickly work can be done. The unit of power is the Watt = 1 Joule/ 1 second.
One common unit of energy is the kilowatt-hour (kWh). If we are using one kW of power, a kWh of energy will last one hour.
1. On an object the work done does not depend upon:
B. Angle between force and displacement
C. Force applied
D. Initial velocity of an object
2. Which of the following device converts chemical energy in to electrical energy?
B. Loud Speaker
C. Solar Cell
D. Electric Motor
3. What is the unit of energy in c.g.s system?
4. What is the formula of work done?
A: Work done = force × displacement;
B: Work done = force × velocity;
C: Work done = pressure × displacement
D: Work done = mass × acceleration;
5. An object of mass 200 g moving with velocity 50 cm/s. What is its kinetic energy?
A: 2.1 × 105 erg
B: 2.0 × 105 erg
C: 2.8 × 105 erg
D: 2.5 × 105 erg
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