ICSE ICSE Class 8 - CISCE Question Bank Solutions

What is the change in average kinetic energy of molecules of a liquid during boiling at its boiling point?

How is the heat energy supplied to a liquid used during boiling at a fixed temperature?

Name two ways of change of liquid state to the vapour state and distinguish them.

When sound propagates in air, it does not carry energy with it.

In a longitudinal wave, compression and rarefaction are formed.

The distance from one compression to nearest rarefaction is called wavelength.

The frequency is measured in second.

The quality of a sound depends on the amplitude of wave.

The pitch of sound depends on frequency.

Decibel is the unit of pitch of a sound.

Flow of protons constitutes electric current.

The time period of a wave is 2 s. Its frequency is ..........

The pitch of a stringed instrument is increased by .................. tension in string.

The pitch of a flute is decreased by ................... length of air column.

Smaller the membrane, .................. is the pitch.

If a drum is beaten hard, its loudness ................

Overloading of electric current in circuits can lead to short-circuiting.

 A tuning fork produces sound of ................... frequency.

 Write true or false

 Overloading of electric current in circuits can lead to short circuiting.

The earth wire protects us from an electric shock.