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

How is compost prepared?

Write short notes on Mushrooms.

Rulers, measuring tapes and metre scales are used to measure ______

Metre is the unit of ______.

Match the following.

Assertion (A): Distance between two celestial bodies is measured in terms of light year.

Reason (R): The distance travelled by the light in one year is one light year.

Can you find the diameter of a thin wire of length 2 m using the ruler from your instrument box?

Numerical Problem.

Inian and Ezhilan argue about the light year. Inian tells that it is 9.46 × 10¹⁵ m and Ezhilan argues that it is 9.46 × 10 ¹² km. Who is right? Justify your answer.

State whether true or false. If false, correct the statement.

Distance covered by a particle never becomes zero but displacement becomes zero.

Assertion: Displacement of a body may be zero when distance travelled by it is not zero.

Reason: The displacement is the shortest distance between initial and final position.

Distinguish distance and displacement.

Exercise Problems.

An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 m and 20 s?

State whether true or false. If false, correct the statement.

The anode in electrolyte is negative.

The direction opposite to the movement of electron is called ______ current.

Assertion: Incident ray is directed towards the centre of curvature of spherical mirror. After reflection it retraces its path.

Reason: Angle of incidence (i) = Angle of reflection (r) = 0°

Why do some stars appear blue and some red?

You have just won a medal made of 22-carat gold. Have you just procured a pure substance or impure substance?

The number of neutrons present in  73Li is ______.

Calculate the number of neutrons, protons and electrons: 

1. atomic number 3 and mass number 7
2. atomic number 92 and mass number 238.

Modern periodic law states that the physical and chemical properties of elements are the periodic functions of their ______.