SSLC (English Medium) Class 9 - Tamil Nadu Board of Secondary Education Question Bank Solutions

Assertion: The speed of sound in air is less than the speed of sound in solid.
Reason: If we increase the temperature of medium, the speed of sound increases in any medium.

The speed of sound in a gaseous medium depends on the nature of the gas.

On which factors does the speed of sound in the gaseous medium depend?

On which factors does the speed of sound in the solid medium depend?

Numerical problems:

Two persons are at opposite ends of a steel rod. One strikes the end of the rod with a stone. Find the ratio of time taken by the sound wave in the air and in steel to reach the second person. (Sound of speed in steel = 5960 ms^-1, Sound of speed in air = 344 ms^-1).

Numerical problems:

A Sound wave travels at a speed of 344 ms^-1. If the wavelength is 1.5 cm, what is the frequency of the Wave? Will it be audible?

What is microgravity?

The orbital velocity of the satellite depends on its ______.

Write down the formula of orbital velocity.

Write the methods of separation for the following:

The body cavity of the phylum Aschelminthes is ______.

The most common diseases caused by nematodes in human beings are ______ and ______.

Setae and parapodia are locomotor organs of earthworms.

Aschelminthes is the largest phylum of the animal kingdom.

Air-breathing fishes are cultured in ______ water.

Central Marine Fisheries Research Institute (CMFRI) is situated at ______.

Culture of fishes along with Agricultural crops is known as ______.

The longest marine water prawn is ______.

Earthworms are sacred – This statement was made by  ______.

The Central Institute of Brackish Water Aquaculture (CIBA) was established in ______.