SCIENCE QUIZ(CLASS-9 SIMPLE MACHINE)

A tool that makes our work easier, faster, and more convenient in our daily life is known as :

• (a) Fixed machine

• (b) Approved Machine

• (c) Perfect machine

• (d) Simple machine

In third-class lever, the mechanical advantage is

• (a) More than one

• (b) Less than one

• (c) Equal to one

• (d) None of them

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

• (a) Fulcrum

• (b) Load

• (c) Effort

• (d) Output work

The work done on a machine is known as :

• (a) Effort

• (b) Input work

• (c) Output work

• (d) Efficiency

The work done by the machine is called :

• (a) Effort

• (b) Input work

• (c) Output work

• (d) Efficiency

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

• (a) Easier.

• (b) complex

• (c) delay

• (d) use full

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.

The ratio of output work and input work in a machine is known as :

• (a) Velocity ratio

• (b) Mechanical advantage

• (c) Fulcrum

• (d ) efficiency

Which one is the right relation between efficiency (η) and mechanical advantage (MA)?

• (a) η ∝ 1/ MA

• (b) η ∝ MA

• (c) η ∝ (MA)²

• (d) η ∝ 2MA

Which one is right about the perfect machine?

• (a) η = 100%

• (b) η < 100%

• c) η > 100%

• (d) All are right