English Medium Class 9 - CBSE Question Bank Solutions for Science

What are longitudinal waves and transverse waves? Explain with the help of labelled diagrams.

Give two examples each of longitudinal waves and transverse waves.

Explain the terms 'compressions' and 'rarefactions' of a wave. What type of waves consist of compressions and rarefactions.

Explain the terms 'crests' and troughs' of a wave? What type of waves consist of crests and troughs?

The flash of a gun is seen by a man 3 seconds before the sound is heard. Calculate the distance of the gun from the man (Speed of sound in air is 332 m/s).

The longitudinal waves travel in a coiled spring at a rate of 4 m/s. The distance between two consecutive compressions is 20 cm. Find :
(i) Wavelength of the wave (ii) Frequency of the wave

Which one of the following does not consist of transverse waves?

Which of the following can produce longitudinal waves as well as transverse waves under different conditions?

In an experiment, Anhad studies sound waves. He sets up a loudspeaker to produce sound as shown below :

Anhad adjusts the signal to the loudspeaker to give a sound of frequency 200 Hz.
(a) What happens to the air in-between Anhad and the loudspeaker ?
(b) Explain how Anhad receives sound in both ears.

When we change a feeble sound to a loud sound, we increase its :

Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the strings suitably. By doing so he is adjusting :

'Note' is a sound :

Which of the following frequency of sound can be generated by a vibrating simple pendulum as well as by the vibrating vocal cords of a rhinoceros ?

We can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound called :

At 20°C, the minimum distance of a person from a sound reflecting surface to hear an echo is :

What is tissue?

What is the utility of tissues in multi-cellular organisms?

Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions

Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions

Match the physical quantities given in column A to their S I units given in column B: