P-1 Chemical reactions and equations — Science STD 10 — Question

(i) Why is the constant of gravitation called a universal constant?
(ii) Newton’s law of gravitation is called the universal law of gravitation. Why?

Name one ionic compound containing chlorine and one covalent compound containing chlorine.

Objectives of Mock Drill:

Give two examples of combination reaction.

In two methods of control of corrosion of aluminium, either a layer of aluminium oxide is formed or a silver plating is done on the surface. State to which electrode the aluminium article is attached in these methods respectively.

An object takes 5 s to reach the ground from a height of 5 m on a planet. What is the value of g on the planet?

What are periodic properties?

What for Probiotic food is famous?

The mass and weight of an object on the earth are 5 kg and 49 N respectively. What will be their values on the moon? Assume that the acceleration due to gravity on the moon is l/6th of that on the earth.

What is meant by ‘refraction of light’? Draw a labelled ray diagram to show the refraction of light.