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प्रश्न
State whether the following statement is True or False.
A machine performs work by itself.
विकल्प
True
False
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उत्तर
False
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संबंधित प्रश्न
State whether the following statement is True or False.
A boy does work while pushing a wall.
Select the correct alternative:
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Define the term ‘work input’ and ‘work output’ in relation to a machine.
Give a reason for the following.
Machines are able to make our work convenient.
Can a machine be 100% efficient?
Classify the following as a lever, a pulley and an inclined plane:
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Classify the following as a lever, a pulley and an inclined plane:
An axe
Classify the following as a lever, a pulley and an inclined plane:
A knife
Why is this so traveller’s bags have wheels?
Name a machine for each of the following uses:
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- to change the point of application of force,
- to change the direction of force,
- to obtain the gain in speed.
