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Simple Machines

Description: This test is standardised achievment test in physics suitable for the students of cbse,icse and all other boards of class 6 and also useful for the students of different competitions and olympiads.
Number of Questions: 20
Created by:
Tags: work and machines Fundamentals of Work Motion and Force Motion in One Dimension
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Nut cracker is an example of which type of lever?

  1. First class lever

  2. Second class lever

  3. Third class lever

  4. Wedge

  5. Screw

Show answer
Correct Option: B
Explanation:

Nut cracker is an example of second class lever because the load lies between the effort and the fulcrum.

A single person can lift a car by using machine called

  1. inclined plane

  2. chisel

  3. screw-jack

  4. tong

  5. axe

Show answer
Correct Option: C
Explanation:

A single person can lift a car by using screw-jack which works on the principle of screw.

For a lever to be classified as a force multiplier,

  1. the load arm must be longer than the effort arm

  2. the load arm and the effort arm must be of the same length

  3. the load arm must be shorter than the effort arm

  4. any arm can be greater

  5. the length of the arms is calculated according to the effort

Show answer
Correct Option: C
Explanation:

In a force multiplier, the effort arm is always longer than the load arm.

Why is an inclined plane used as a force multiplier?

  1. The mechanical advantage of inclined plane is less than one.

  2. The mechanical advantage of inclined plane is greater than one.

  3. The mechanical advantage of an inclined plane is equal to one.

  4. More force is needed.

  5. Load is multiplied by it.

Show answer
Correct Option: B
Explanation:

Yes, the mechanical advantage of an inclined plane is greater than one. Therefore, an inclined plane is used as a force multiplier.

Which of the following statements is not true for a simple machine?

  1. Mechanical advantage can be less than one.

  2. The efficiency may be less than 100%.

  3. The energy dissipated by the machine is the maximum.

  4. It can also be used as a speed multiplier.

  5. The mechanical advantage of a simple machine depends upon its weight.

Show answer
Correct Option: B
Explanation:

If the efficiency of a machine is less than 100%, then also it is a simple machine.

The handle of a tube well (boring well) is a/an

  1. first class lever

  2. second class lever

  3. third class lever

  4. screw

  5. inclined plane

Show answer
Correct Option: A
Explanation:

The handle of tube well is an example of a first class lever because the fulcrum lies between the effort and the load.

In a wheel and axle arrangement, the diameter of wheel should be

  1. equal to the diameter of axle

  2. smaller than the diameter of axle

  3. more than the diameter of axle

  4. independent of axle

  5. dependent on the direction of movement

Show answer
Correct Option: C
Explanation:

In a wheel and axle arrangement, wheel is always bigger in diameter than axle.

Which of the following reduces the effort by changing the direction of force applied?

  1. Wedge

  2. Levers

  3. Screw

  4. Inclined plane

  5. Pulley

Show answer
Correct Option: E
Explanation:

Pulley reduces the effort by changing the direction of force applied.

Which of the following is a class I lever?

  1. Fulcrum is between the load and the effort.

  2. Load is between the fulcrum and the effort.

  3. Effort is between the load and the fulcrum.

  4. Fulcrum, load and effort are all at one point.

  5. Fulcrum and effort are on the same point, but load is at either side.

Show answer
Correct Option: A
Explanation:

In a first class lever, fulcrum lies between the load and the effort, i.e. the load and the effort are on the opposite side of the fulcrum.

Which of the following relationship is true?

  1. Effort * distance moved by effort = Load * distance moved by load.

  2. Effort * distance moved by effort > Load * distance moved by load

  3. Effort * distance moved by effort < Load * distance moved by load

  4. Effort / distance moved by effort = Load * distance moved by load

  5. Effort * distance moved by effort = Load / distance moved by load

Show answer
Correct Option: A
Explanation:

This is the right equation.

What happens when the height of an inclined plane decreases?

  1. The mechanical advantage and effort both decrease.

  2. The mechanical advantage and effort both increase.

  3. The mechanical advantage increases, but effort decreases.

  4. The mechanical advantage decreases, but effort increases.

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

Show answer
Correct Option: C
Explanation:

The mechanical advantage of an inclined plane is the ratio of the length of the plank to the vertical height of the load raised. So, when the height of an inclined plane decreases, the mechanical advantage increases, but the effort decreases.

In which of the following is the effort arm always greater than the load arm?

  1. First class lever

  2. Second class lever

  3. Third class lever

  4. Fourth class lever

  5. Fifth class lever

Show answer
Correct Option: B
Explanation:

In this type of lever, the effort arm is always longer than the load arm.

Which of the following is not a third class lever?

  1. Raising a load kept on the palm of a hand using the forearm

  2. Kicking a football by legs

  3. Spade used to lift a load

  4. Spade used for turning the soil

  5. Knife used for cutting an apple

Show answer
Correct Option: D
Explanation:

It is a first class lever. The portion by which soil is turned is attached with a rod. This attachment works like a fulcrum, which is present between the effort and the load.

A wedge is a triangular shaped tool that can be used to stop, split, seperate or hold an​ object in place. Which of the following things is not a wedge?

  1. Door stop

  2. Chisle

  3. Blade

  4. Scissors

  5. Axe

Show answer
Correct Option: D
Explanation:

Scissors is a first  class lever.

Which of the following statement is false about a pulley?

  1. Force is applied towards gravity

  2. Direction of force can be changed

  3. It is neither a speed multiplier nor a force multiplier

  4. Wheel is fixed over the axle

  5. It is used to lift heavy objects

Show answer
Correct Option: D
Explanation:

It is wrong because wheel is not fixed but rotates freely over the axle.

The formula for the mechanical advantage of an inclined plane is

  1. load arm divided by effort arm

  2. distance divided by height

  3. height divided by distance

  4. effort arm multiplied by load arm

  5. half of the input arm divided by output arm

Show answer
Correct Option: B
Explanation:

The mechanical advantage of an inclined plane is the ratio of the length of the plank to the vertical height of the load raised.

A lighter child can move a heavier child on a seesaw if :

  1. he stands on it

  2. he moves closer towards the fulcrum

  3. moves away from the fulcrum

  4. he lies on it

  5. he can not do this

Show answer
Correct Option: C
Explanation:

Yes, because it is a type of class - I lever, in this type of lever if the effort arm is longer than the load arm than the lever acts as a force multiplier.

Which of the following simple machines is termed as the revolving lever of first order?

  1. Screw

  2. Inclined plane

  3. Pulley

  4. Wheel and axle

  5. Wedge

Show answer
Correct Option: D
Explanation:

Wheel and axle arrangement is also a kind of lever where the arms of the lever are at the radii of the wheel and axle and its centre acts as the fulcrum. It may be termed as revolving lever of the first order.

What type of a simple machine would the bottom of a light bulb be?

  1. Wedge

  2. Lever

  3. Pulley

  4. Screw

  5. Wheel and axle

Show answer
Correct Option: D
Explanation:

The bottom of a light bulb is a screw, we can see that there are grooves present on the bottom of the light bulb. When  the bulb is fixed into the socket , it rotates like a screw to fix, with the help of these grooves, the bulb is  gripped firmly in the socket.

Why is it easy to draw water from a well when the rope passes over a pulley, rather then drawing it directly?

  1. Pulley adds more water

  2. Pulley decreases the weight of the bucket

  3. Pulley has a mechanical advantage of more than one

  4. Pulley changes the direction of force

  5. Pulley increases the effort

Show answer
Correct Option: D
Explanation:

Yes, pulley changes the direction of the pull on the rope from upwards against gravity to downwards towards gravity. This makes easier to lift heavy bucket. No, pulley does not increases the effort but it decreases it.

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