Energy consumed by 60 watt bulb in 2 minutes is equal to:
Correct answer: A. 7.2 kilo joules
- A. 7.2 kilo joules
- B. 720 joules
- C. 120 joules
- D. 72000 joules
Explanation
Power=Energy/time Energy=power ×time 60 watt×120 sec =7200 J =7.2 kilo J.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
Practise Work and Energy
748 free Work and Energy MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Work and Energy questions
The sum of all forms of molecular energies (kinetic and potential) of a substance is termed as:
Kilowatt-hour is a unit of:
A neutron travels a distance of 24 m in a time interval of 3.6 x 10^-4 s. Assuming its speed was constant, find its kinetic energy. Take 1.7 x 10^-27 kg as the mass of the neutron:
The K.E. of a body of mass 2kg and momentum of 2Ns is:
Which is the unit of energy:
A particle of mass m=9 x 10^-31 kg moving towards the wall of a vessel at a velocity of v=600 ms-1 strikes it at an angle of 60° to the normal and rebounds at the same angle at the same speed. The impulse of the force experienced by the wall during the impact is: