Sound

The instrument that measures atmospheric pressure is

pH value of pure water is -

Mach number is significant in _________.

Refers to a pulse transmitter-receiver used in radio navigation and secondary surveillance radar to either a reply from transponder is called

Which primary colours produce different shades on TV screen?

The speed of sound in a ideal gas varies directly as its:

The scanning of uterus in determining the sex of the child is preferred more with ultrasonic waves rather than with X-rays. It is because.

Below are two statements; one is labelled as Assertion (A), and the other is labelled as Reason (R). 

Assertion (A): Sound waves can travel through vacuum.
Reason (R): Light is an electromagnetic wave and can travel through vacuum. 

Select the correct answer using the codes below.

In which one of the following is the speed of sound maximum?

Through, which of one among the following materials, does sound travel slowest:

The sound of an aircraft roughly corresponds to -

Which of the following statements is INCORRECT?

What is the effect on apparent frequency when the distance between the source of the sound and listener is decreased?

The radar used by police to check over-speeding vehicles works on the principle of_____.

The distance between two successive crests or troughs of sea waves is called as

Which one of the following phenomena CANNOT be exhibited by sound Waves ?

When a longitudinal wave moves through a certain medium, the quantity which is transmitted through the medium is be

Which of the following statements is correct?

What is the rate at which a wave moves through water and is measured in knots?

For a wave, wavelength divided by the time period is equal to_____.