Tag: physics

Questions Related to physics

The radius of the press cylinder in a hydraulic press is equal to the diameter of its pump cylinder. Its mechanical advantage is __________.

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

  1. 1

  2. 2

  3. 3

  4. 4

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Correct Option: D

A device which helps to lift heavy loads or speed up the motion or change the direction of force in the desired direction.

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

  1. Machine

  2. Magnets

  3. Motor

  4. All

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Correct Option: A
Explanation:

A machine is a device which helps us to lift heavy loads or speed up the motion or change the direction of force in the desired direction. It can be used to obtain a gain in speed or in many more actions.

Any sloping flat surface along which a load can be easily pushed or pulled is called

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

  1. Inclined plane

  2. Wedge

  3. Screq

  4. Lever

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Correct Option: A
Explanation:

Any sloping flat surface along which a load can be easily pushed or pulled is called Inclined plane. An inclined plane is a sloping surface behaving like a simple machine and has a mechanical advantage of always greater than 1.

Simple machine is classified into ....... major classes.

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

  1. 6

  2. 3

  3. 4

  4. 5

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Correct Option: A
Explanation:
  • Six classes of simple machine are
  • Inclined plane.
  • Lever.
  • Pulley.
  • Screw.
  • Wedge.
  • Wheel and axle.

An external force applied to a simple machine to overcome the load is effort.

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

  1. True

  2. False

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Correct Option: A

State true or false.
A crow bar is used for tearing a part a piece of wood.

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

  1. True

  2. False

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Correct Option: B

State true or false.
A doorknob is an example of wheel and axel.

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

  1. True

  2. False

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Correct Option: A

Simple machines make work easier by trading _____ for force.

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

  1. distance

  2. work

  3. friction

  4. motion

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Correct Option: A
Explanation:
Simple machines make work easier to do by decreasing the force required by increasing  the distance over which the work is done. 
Therefore, option A is correct.

The velocity ratio (VR) for a machine is-

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

  1. Always constant

  2. Varies with effort (P)

  3. Varies with machine input

  4. Varies with machine output

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Correct Option: A
Explanation:

Velocity ratio of simple machine is the ratio of distance traveled by the effort to the distance traveled by the load in the machine. As velocity ratio or ideal mechanical advantage is a simple ratio of two distances.Hence always remains constant.
Option A is correct.
 

Which of the following is a simple machine?

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

  1. candle

  2. water

  3. pulley

  4. chair

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Correct Option: C
Explanation:

C. A pulley is the example of simple machine