SSLC (English Medium) कक्षा ९ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

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?

The ratio of masses of oxygen in CO and C02 for the fixed mass of carbon is 1: 2. The above is the law of ______.

The combination of different elements to form a compound is governed by certain basic rules called ______.

The combination of different elements forms a ______.

Why do the chemical properties of an element determined by valence electrons?

______ is the gas produced when HCl is added with carbonate salt.

Do not use ______ for school projects. 

Do not eat hot food items in plastic containers.

What we can do to prevent plastic pollution?