Advertisements
Advertisements
प्रश्न
Give a reason for the following.
The efficiency of a machine is always less than 100%.
Advertisements
उत्तर
Efficiency of a machine is always less than 100% as output energy is always less than the input energy because some energy is lost to overcome friction.
APPEARS IN
संबंधित प्रश्न
Fill in the blank
Cooking gas converts _______ energy into heat energy.
Match the following columns
| COLUMN A | COLUMN B |
| 1. Running water | 1. heat energy |
| 2. Burning | 2. vibrations |
| 3.Energy | 3.atom bomb |
| 4.Sound energy | 4.kinetic energy |
| 5.Nuclear energy | 5.joule |
What is energy?
Name the commercial unit of measurement of energy.
Name the quantity whose unit is :
(a) kilowatt
(b) kilowatt-hour
A certain household consumes 650 units of electricity in a month. How much is this electricity in joules?
Can you tell?
When can we say that displacement has taken place?
What energy transfer happen in a car engine?
Which one of the following is not the unit of energy?
A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back? (g = 10 m s–2)
