Lesson 3 class 7 and 8

There are ...... types of simple machine

• 2

• 4

• 5

• 6

In which class wheel barrow lies?

• first

• Second

• Third

• no one

Winding road is an example of ...............

• Lever

• inclined plane

• Wedge

• Pulley

 $\frac{L}{E}$  is the formula of

• Mechanical Advantage

• Velocity ratio

• work output

• work input

In third class lever which lies between?

• load

• Fulcrum

• effort

• no one

There are ...... types of lever.

• 2

• 3

• 4

• 5

The principle of lever is ..........

• L x LD = E x ED

• E xED = L x LD

• Both

• no one

Screw driver is an example of .....

• screw

• lever

• inclined plane

• wheel and axle.

Example of second class lever is .

• bottle opener

• wheel borrow

• nut cracker

• All above

In simple machine load is always ............ than effort.

• smaller

• equal

• greater

• greater and smaller