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

The velocity of sound in solid is ______ than the velocity of sound in air.

Numerical problem.

A stone is dropped from the top of a tower 750 m high into a pond of water at the base of the tower. Calculate the number of seconds for the splash to be heard? (Given g = 10 m s^–2 and speed of sound = 340 m s^–1)

Define orbital velocity.

Write a note on orbital velocity

How is a satellite maintained in nearly circular orbit?

Why are some satellites called geostationary?

Numerical problem.

Calculate the speed with which a satellite moves if it is at a height of 36,000 km from the Earth’s surface and has an orbital period of 24 hr (Take R = 6370 km) [Hint: Convert hr into seconds before doing calculation]

Numerical problem.

At an orbital height of 400 km, find the orbital period of the satellite.

List some of the ways in which you could save water in your home and school.

Name the chronic diseases associated with respiratory system.

The production and management of fish is called ______.

______ is the method of culturing different variety of fish in a water body.

Give an account of different types of fish ponds used for rearing fishes.

The Kelvin is the basic unit of ______.

Match the following:

Match the following:

Mention the uses of the velocity-time graph.

The area under the v-t graph represents a physical quantity that has the unit.

Which of the following can determine the acceleration of a moving object.

A straight line parallel to the x-axis in the velocity-time graph represents the object moving in ______.