Lever

Q. What is a velocity ratio?

Q.

The machine made with the help of two or more than two simple machines is called a ___ machine.

Q.

What is mechanical advantage?

Q. Bottle cap is an example of which simple machine?

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

Q.

Why, in a real machine, is the output work always less than the input work?

Q. Elevator is an example of .

1. Screw
2. Pulley
3. Wheel and axle

Q.

What do you mean by load, effort and fulcrum of the machine?

Q.

Which of these is not an inclined plane?

1. Wall

2. Ramp

3. Wedge

4. Stairs

Q. A crowbar is a lever of ?

Q.

Choose the first-order lever from the following options.

1. Lemon squeezer

2. Opening or closing of a door

3. Handle of a simple hand pump

4. Cutting of bread with a bread knife.

Q.

What is transferred when work is done?

Q.

Explain why the mechanical advantage of the class III lever is always less than 1.

Q.

Wheelbarrow is a class III lever.

1. False

2. True

Q. Which of the following is not a class I lever?

1. Shovel
2. Scissors
3. Seesaw
4. Crowbar

Q.

Select the correct statement.

1. A pair of pliers is a lever of class II

2. Claw Hammer is a lever of class III

3. Nut Cracker is a lever of class II

4. Knife is a lever of class III

Q.

The fixed point about which the lever turns is called ____.

1. fulcrum

2. load

3. load arm

4. effort

Q.

A faucet handle is an example of:

1. fixed pulley

2. inclined plane

3. wheel and axle

4. wedge

Q.

Lever, inclined plane, screw, wedge, pulley, wheel, and axle are the six machines that make our day-to-day life easier. But one of the simple machines does not move while at work. Identify the simple machine. Explain why it is considered a simple machine.

Q. Which of the following is/are the characteristics of a simple machine?

1. More work with less effort
2. Usage in day-to-day life
3. Complicated structure
4. Ease of handling

Q. What is velocity ratio?

Q.

If the mechanical advantage is greater than $1$, this means that the machine is distance multiplier.

1. True
2. False

Q.

Define gear ratio.

Q.

What are the spiral cuts or curves that we see on a screw called?

1. Axle

2. Moores

3. String

4. Grooves

Q. When more load is moved with less effort by a simple machine, it is called a multiplier.

1. efficiency
2. force
3. complex
4. advantage

Q. The nutcracker is a:

1. Lever
2. Wedge
3. Pulley
4. Screw

Q.

The following diagrams illustrate the positions of the fulcrum, load and effort for a see-saw, common balance, nutcracker and forceps. Select the options that hold true.

1. 

   A common balance

2. 

   A nutcracker

3. 

   A see-saw

4. 

   Forceps

Q.

Which of the following is/are simple machines ?

1. Lever

2. Pulley

3. Wedge

4. Screw

Q.

• Does a flagpole have a simple machine in it? If so, what is it?


• Can that machine change the direction of applied force? If so, briefly explain.

Q. The number of teeth in the crank wheel and free wheel of a bicycle, connected by a chain are 48 and respectively. Their diameters are 20cm and 10 cm respectively. The radius of the rear wheel to which the free wheel is fixed coaxially is 10 times that of the free wheel. If a cyclist pedals the bicycle at two rotations per second, find the speed of the cyclist.

Q.

Define the efficiency of a machine. Why the efficiency of the practical machines is less than 1?