English Medium Class 9 - CBSE Question Bank Solutions for Science

What is sound and how is it produced?

What do we get from cereals, pulses, fruits and vegetables?

How do biotic and abiotic factors affect crop production?

What are the desirable agronomic characteristics for crop improvements?

What is genetic manipulation?

State Kepler’s law which is represented by the relation r³ ∝ T².

Which of the Kepler’s laws of planetary motion led Newton to establish the inverse-square rule for gravitational force between two bodies ?

Can we apply Newton’s third law to the gravitational force ? Explain your answer.

State two applications of universal law of gravitation.

State the universal law of gravitation. Name the scientist who gave this law.

State and explain Kepler's laws of planetary motion. Draw diagrams to illustrate these laws.

Universal law of gravitation states that every object exerts a gravitational force of attraction on every other object. If this is true, why don’t we notice such forces ? Why don’t the two objects in a room move towards each other due to this force ?

Which type of cell division is required for growth and repair of body and which type is involved in formation of gametes?

When sugar is dissolved in water, there is no increase in the volume. Which characteristic of matter is illustrated by this observation?

Which single term is used to describe the mixing of copper sulphate and water kept in a beaker, on its own?

Even two or three crystals of potassium permanganate can impart colour to a very large volume of water. Which characteristic of particles of matter is illustrated by this observation?

When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?