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

The separation of cream from milk is an example of the application of ______.

The force experienced by a boy in the merry-go-round is a centripetal force.

Sailors use ______ to find direction in order to navigate on the sea.

An electric bell contains an ______, consisting of coils of insulated wire wound around
iron rods.

A wire with green insulation is usually the live wire of an electric supply.

Define the magnetic effect of electric current.

Define step up and step down transformer.

The speed of light decreases in a denser medium, light bends towards the normal.

Light is one of the slowest traveling energy with a speed of 3 × 10^-8ms^-1

Two medium with a refractive index of 1.31 & 1.50 is given. In which case 

1. The bending of light is more and
2. speed of light is more.

Higher-Order Thinking Skills:

M = 2.42 for diamond. What is the meaning of this statement in relation to the speed of light?

______ is a process that is just the reverse of melting.

What do you mean by solidification or deposition?

To hear an echo, the minimum distance of the obstacle from the source of sound must be ______.

______ allows bats to navigate through dark caves and find insects for food.

______ is an image obtained by the use of reflected ultrasonic waves.

Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.

What is an echo? Write the conditions to hear an echo.

Numerical problems:

An echo returned in 3s. What is the distance of the reflecting surface from the source given that the speed of sound is 330 ms^-1?

What is fractional distillation?