(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Physics

Is conduction possible in vacuum?

Why do we wear woolen clothes in winter?

Why is a newly made quit warmer than an old one?

Name three devices which are used to detect heat radiations.

What do you mean by linear expansion?

Define coefficient of linear expansion.

What is a bimetallic strip?

What is the unit of coefficient of linear expansion?

Name the substance which contracts when heated from 0⁰C to 4⁰C.

Define coefficient of volume expansion.

What is the unit of coefficient of volume expansion?

How can a glass stopper jammed in the neck of a bottle be removed?

Why does a substance expand on heating?

A small gap is left between two iron rails of the railway track. Why?

Why are bridges made of steel girders put on rollers?

What is the relation between α and γ?

A copper wire 10 cm long is heated from 20⁰C to 30⁰C. Find the increase in length of the wire, if coefficient of linear expansion of copper is 1.7 X 10^-5oC^-1

One liter of mercury at 10⁰C is heated to 30⁰C. Find the increase in the volume of mercury. The coefficient of cubical expansion of mercury is 1.8 X 10^-4 0C^-1.

Why is a ventilator provided in a room?

Is it possible to heat a liquid or gas from above? Explain your answer.