Question

Mcq on work power and energy

Answer 1

Output of a truck is 4500 J and its efficiency is 50%, input energy provided to truck is

• A. 5000 J
• B. 900 J
• C. 9000 J
• D. 500 J

Potential energy and kinetic energy are types of

• A. Electrical energy
• B. Magnetic energy
• C. Thermal energy
• D. Mechanical energy

In a typical power station, amid a series of energy transfers and conversions, about 70% of energy input gets wasted in form of thermal energy, efficiency of such a power station is about

• A. 0.3
• B. 0.4
• C. 0.7
• D. 1

A car uses total energy of 2500 J and output is 750 J. efficiency of car is

• A. 50%
• B. 30%
• C. 25%
• D. 80%

In order to do work, energy is

• A. transferred or converted
• B. used up
• C. lost
• D. lost or transferred