SSLC (English Medium) Class 7 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

Write a note on artificial satellites.

Stars appear to twinkle. Give reason.

Do stars emit light only during the night?

The fibers such as rayon, nylon, and polyester are obtained from ______.

Which of the following is found in sanitary products?

The cellulose dissolves in the chemicals added to it and produces syrup called ______.

Rayon is a fibre obtained by the chemical treatment of wood pulp.

Why is rayon called on artificial silk?

Write the importance of rayon.

Questions based on Higher Order Thinking Skills:

There are three spheres A, B, C as shown below. Sphere A and B are made of same material. Sphere C is made of a different material. Spheres A and C have equal radii. The radius of sphere B is half that of A. Density of A is double that of C.

Now answer the following questions.

1. Find the ratio of masses of spheres A and B.
2. Find the ratio of volumes of spheres A and B.
3. Find the ratio of masses of spheres A and C.

Light year is the unit of ______.

Give the value of one light year.

Name the units used to measure the distance between celestial objects.

What is one light year?

Define - Astronomical unit.

Show the shape of the distance – time graph for the motion in the following cases. 

1. A bus moving with a constant speed. 
2. A car parked on a road side.

What do you understand by chemical formula of a compound? What is its significance?

Write the chemical formula for the following elements.

1. Hydrogen
2. Nitrogen
3. Ozone
4. Sulphur

Atomic number : ______ :: Mass number : Number of protons and neutrons.

What is atomic number?