Lever

Q.

What should we do to reduce the amount of effort needed to lift something using a lever?

1. Move the fulcrum closer to the load

2. Move the fulcrum to the middle of the lever

3. Move the fulcrum away from the load

4. Move the fulcrum closer to the effort

Q.

The force applied to a machine to do mechanical work, is called

1. load

2. pressure

3. effort

4. energy

Q.

Where does a position of the centre of gravity lie for:

A circular lamina?

Q. Jack is using a hammer for removing a nail from a piece of wood. Which simple machine is he using?

1. Screw
2. Pulley
3. Lever
4. Wheel and axle

Q.

Knife is an example of a lever of first order.

1. True
2. False

Q.

A nut cracker is an example of _______________.

1. first order lever

2. second order lever

3. third order lever

4. None of the above

Q.

If the fulcrum is closer to the load, it will take:

1. More force to lift the load

2. Less force to lift the load

3. Equal force to lift the load

4. Zero force to lift the load

Q. In a lever, the fixed point around which the rod moves is called _______.

1. pulley
2. fulcrum
3. effort
4. load

Q.

Draw a lever that reduces force. Mark the position of load, fulcrum, and effect on it.

Q.

Give reason:

For lifting heavy loads, we prefer inclined planes that slope up gradually.

Q.

State whether the statement is true or false. If false, rewrite the correct form of the statement.

If the load arm is longer than the effort arm, the force applied by the effort will increase.

1. True
2. False

Q.

In the case of a lever of the third order, the effort arm is always _________ than the load arm.

Q.

Which of the following machines utilize a wheel and axle?

1. Screw

2. Scissors

3. Ferris wheel

4. Door knob

Q.

A sugar tongs is a lever of_________order.

Q. Cutting plier acts as:

1. Speed multiplier
2. Force multiplier
3. Work multiplier
4. Mass multiplier

Q.

In the case of plucking out a nail using a hammer, where is the load applied?

1. At the handle

2. At the tip of the handle

3. At the hammer claw

4. There is no load point

Q.

Which of the following object(s) is a similar type of lever to the one shown in the diagram?

1. 

2. 

3. 

4. 

Q.

In this type of boat, the fulcrum on the oar is:

1. Middle of the oar

2. Water

3. The boat

4. The hand

Q.

A lever in which an effort applied is always more than the load moved is a lever of :

1. first order

2. third order

3. second order

4. none of these

Q.

In this type of boat, the fulcrum on the oar is:

1. Water

2. Middle of the oar

3. The boat

4. The hand

Q.

Keshav has a lever to lift heavy rocks. What should he do to reduce the force required to lift the rocks?

1. Increase the length of effort arm

2. Decrease the length of effort arm

3. Increase the length of load arm

4. Decrease the length of the load arm

Q. A simple machine is said to be force multiplier when:

1. More effort is needed
2. Less effort is needed
3. Equal effort is needed
4. Zero effort is needed

Q.

The greater the slope of an inclined plane, the easier it is to push a load up along it.

1. True
2. False

Q.

There are ___ major parts of a lever.

1. 2

2. 5

3. 10

4. 12

Q. Which simple machine do you see in the following images?

1. 
2. 
3. 
4. 

Q. Formula of Workdone formula

Q.

Which of the following is a lever?

1. Jar lids

2. Axe

3. Nutcracker

4. Slide

Q.

The unit of force is

1. Newton

2. Pascal

3. Kilogram

4. Metre

Q.

When the________is in the middle of load and fulcrum, it is a lever of the third order.

Q. Which one of the following is a Class III lever? (E-effort, F-fulcrum and L-load)

1. 

2. 
   

3. 

4.