Class III Lever

Q.

Which of the following is an example of a class III lever?

1. See- saw

2. Broom

3. Axe

4. Scissors

Q.

Draw a labelled sketch of a class III lever. Give one example of this kind of lever.

Q.

A fishing rod is an example of class III lever.

1. True.

2. False

Q. What type of lever is a fishing rod?

1. Class I
2. None
3. Class II
4. Class III

Q.

State the class of levers in sugar tongs and a bottle opener.

1. Sugar tongs - class III lever

   Bottle opener - class II lever

2. Sugar tongs - class II lever

   Bottle opener - class II lever

3. Sugar tongs - class III lever

   Bottle opener - class I lever

4. Sugar tongs - class II lever

   Bottle opener - class II lever

Q.

Classify the levers. Draw the diagram showing the fulcrum, point of application of load, and effort.

• Knife

Q.

Why do we use class III levers although they have mechanical advantage less than one?

1. To obtain gain in speed

2. To obtain loss in speed

3. It acts as force multiplier

4. It is used in raising a load

Q.

Class III lever have mechanical advantage less than one. Why are they then used?

1. To obtain gain in speed

2. To obtain loss in speed

3. It acts as force multiplier

4. It is used in raising a load

Q.

Which device is use to lift up or more heavy object using less force ?

1. Lever

2. Shape

3. Screw

4. Wedge

Q.

A lever in which, the effort arm is always longer than the load arm is

1. First-order lever

2. Second-order lever

3. Third-order lever

4. None of these.

Q. Match the following for a lever.

1. Force multiplier
2. See-saw
3. Speed multiplier

Q. accuracy and precision

Q. A horizontal jet of water delivering 50 kg per second at a speed of 4 m per sec, strikes the bladesof a water wheel. The blades are moving with half the speed of the water.The force exerted on the water wheel is

Q.

The lever for which the mechanical advantage is always less than 1 has the :

1. load between the fulcrum and the effort

2. effort between the fulcrum and the load.

3. load and effort acting at the same point.

4. fulcrum between the effort and the load

Q. Do levers always act alone, or do they act with other machines? Give an example of a lever working with another simple machine

Q.

A pair of tongs is an example of :

1. Class I Lever

2. Class II Lever

3. Class III Lever

4. Pulley

Q. Assertion :A crowbar is used to lift heavy loads. Reason: A simple machine can be used as a force multiplier.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. A class 3 lever has the effort between the load and the fulcrum.

1. False
2. True

Q.

Class III levers have mechanical advantage less than one. Why are they then used?

1. It is used in raising a load

2. To obtain gain in speed

3. To obtain loss in speed

4. It acts as force multiplier

Q.

Select the objects which always have a mechanical advantage less than 1.

1. LEVER I

2. LEVER III

3. LEVER II

4. Both B and C

Q.

When is a lever called a lever of Class Ill? Give two examples.

Q. Which class of levers has a mechanical advantage always greater than one? What change can be brought about in this lever to increase its mechanical advantage?

Q. Assertion :A lemon crusher is a 2nd order level. Reason: In a 2nd order lever, effort arm is greater than load arm.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Name the class to which the following lever belongs:
a pair of sugar tongs