Tag: common machines

Questions Related to common machines

A gear is a

physics a little effort, lot of work motion in application common machines introduction to simple machines

  1. Plain Wheel

  2. Toothed Wheel

  3. Smooth Wheel

  4. None of these

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Correct Option: B

Which one of the following can also act as a lubricant in machines?

physics a little effort, lot of work motion in application common machines introduction to simple machines

  1. Iron filling

  2. Polish on machines

  3. Flow of water through the machine

  4. Flow of compressed and purified air.

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Correct Option: D
Explanation:

In the machines, the flow of compressed and purified air lowers the friction, hence it acts as a lubricant.

Example of wheel and axle is :

physics common machines levers and pulleys pulley pulleys

  1. Egg-beaters

  2. Egg-whiskers

  3. Clocks

  4. Electric saw

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Correct Option: B

Levers, inclined planes and pulleys are called:

physics common machines levers and pulleys pulley pulleys

  1. Compound machines

  2. Complex machines

  3. Easy machines

  4. Simple machines

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Correct Option: D
Explanation:
  1. A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. Levers,inclined planes and pulleys are called simple machines

Graphite powder is used in machines to_______

physics common machines terms related to machines introduction to simple machines introduction to machines

  1. enhance friction

  2. enhance profit

  3. reduce friction

  4. reduce efficient

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Correct Option: C
Explanation:

Graphite powder is used in some machines to reduce friction. Ball bearing coverts sliding friction into rolling friction.

When the height of the inclined plane decreases :

physics simple machine common machines terms related to machines introduction to simple machines

  1. The mechanical advantage decreases

  2. The mechanical advantage increases

  3. Effort increases

  4. It will not have any effect on the mechanical advantage

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Correct Option: B
Explanation:

The mechanical advantage increases with decrease in height of inclined plane.

When the height of the inclined plane decreases :

physics simple machine common machines terms related to machines introduction to simple machines

  1. the mechanical advantage decreases

  2. the mechanical advantage increases

  3. effort increases

  4. it will not have any effect on the mechanical advantage

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Correct Option: B

For an ideal machine:

physics simple machine common machines terms related to machines introduction to simple machines

  1. Output= input

  2. Output> input

  3. Output< input

  4. Output ${\geq}$ input

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Correct Option: A
Explanation:

In an ideal machine there will be zero energy loss hence output will be equal to input

Mechanical advantage of a lever is

physics simple machine common machines terms related to machines introduction to simple machines

  1. load + effort

  2. load $\times$ effort

  3. $ \dfrac{load}{effort}$

  4. $ \dfrac{effort}{load}$

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Correct Option: D

Wedge is a :

physics simple machine common machines terms related to machines introduction to simple machines

  1. First order lever

  2. Wheel and-axle

  3. Inclined plane

  4. None of the above

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Correct Option: C