Tag: a little effort, lot of work

Questions Related to a little effort, lot of work

A machine _________ be used as a force multiplier as well as speed multiplier simultaneously. Fill in the blank.

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

  1. Can

  2. Can not

  3. Both

  4. None

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Correct Option: B
Explanation:

A machine is a device by which we can either overcome a large resistive force at same point by applying a small force.

The law of a certain lifting machine is $P =W/50+ 1.5$. The velocity ratio of the machine is 100. Find the maximum possible mechanical advantage and maximum possible efficiency of the machine

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

  1. 50 and 50%

  2. 50 and 60%

  3. 60 and 60%

  4. 60 and 50%

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Correct Option: A

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.

In a wheel-and-axle :

physics a little effort, lot of work levers and pulleys pulley pulleys

  1. wheel rotates freely on axle

  2. wheel is fixed to the axle

  3. direction of the force remains same'

  4. mechanical advantage is always more than one

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Correct Option: B

Wheel-and-axle and rope move in :

physics a little effort, lot of work levers and pulleys pulley pulleys

  1. Same direction

  2. Opposite direction

  3. Perpendicular direction

  4. There is no relation between the two

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Correct Option: A

In a wheel-and-axle :

physics a little effort, lot of work levers and pulleys pulley pulleys

  1. Wheel rotates freely on axle

  2. Wheel is fixed to the axle

  3. Direction of the lbrce remains same

  4. Mechanical advantage is always more than one

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Correct Option: B

The steering wheel is a:

physics a little effort, lot of work levers and pulleys pulley pulleys

  1. first order lever

  2. complex machine

  3. third order lever

  4. wheel and axle

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Correct Option: D

A tap has a :

physics a little effort, lot of work levers and pulleys pulley pulleys

  1. Pulley

  2. Screw arrangement

  3. Wedge

  4. Wheel-and-axle arrangement

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Correct Option: D

In the wheel and axle arrangement,wheel and axle and the rope move in:

physics a little effort, lot of work levers and pulleys pulley pulleys

  1. same direction

  2. opposite direction

  3. perpendicular direction

  4. none of the above

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Correct Option: B