SCIENCE QUIZ (CLASS 8 , SIMPLE MACHINE)

The SI unit of effort is

• (a) Joule

• (b) Newton

• (c) Meter

• (d) Watt

The fixed point about which lever turns is :

• (a) Effort

• (b) Fulcrum

• (c) Load

• (d) Force

The simple machine makes our work ……………… and faster.

• (a) Easier.

• (b) complex

• (c) delay

• (d) use full

A rigid bar that is capable of turning about a fixed point is called :

• (a) pulley

• (b) Screw

• (c) Lever

• (d) Machine

The fixed point about which lever turns is :

• (a) Effort

• (b) Fulcrum

• (c) Load

• (d) Force

What is called when the force is applied to the machine while doing work?

• (a) Fulcrum

• (b) Load

• (c) Effort

• (d) Output work

Formula to calculate input work

• (a) Input work = Effort × load arm

• (b) Input work = Load × load arm

• (c) Input work = Effort × effort arm

• (d) Input work = load arm × load

The machine with 100% efficiency is called:

• (a) Complex machine

• (b) Simple machine

• (c) Useful machine

• (d) Perfect machine.

Which one is right about 1^st class lever?

• (a) Fulcrum lies between load and effort.

• (b) Load lies between fulcrum and effort.

• (c) Effort lies between load and Fulcrum

• (d) Fulcrum lies between load and efficiency.

Which one is the wrong statement?

• (a) Forcep is 3^rd class lever.

• (b) Scissors is 2^nd class lever

• (c) Shovel is 3^rd class lever.

• (d) Physical balance is 1^st class lever .