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

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A part of the longitudinal wave in which particles of the medium are closer than the normal particles is called:

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A part of longitudinal wave in which particles of the medium are farther away than the normal particles is called :

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In the region of compression or rarefaction, in a longitudinal wave, the physical quantity which does not change is:

State four characteristics of a standard unit.

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If the frequency of a wave is 25 Hz. the total number of compressions and rarefactions passing through a point in 1 second is :

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Which of the following is an elastic wave?

What do you understand by the term sound energy?

State three conditions necessary for hearing sound.

Describe briefly an experiment to prove that vibrating bodies produce sound.

Define mass.

State the unit in which mass is measured in C.GS. system.

State the unit in which mass is measured in S.I. system.

State or define the following term:

Solar day

State or define the following term:

Mean solar day

State or define the following term:

An hour

State or define the following term:

Minute

State or define the following term:

Second

State or define the following term:

Year

State the relation between the wavelength and the frequency.

What do you understand by the term order of magnitude of a quantity?