English Medium Class 9 - CBSE Question Bank Solutions for Science

Why is epidermis important for the plants?

Husk of coconut is made of ______ tissue.

______ gives flexibility in plants.

Give reasons for

It is difficult to pull out the husk of a coconut tree.

Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?

Two identical bullets are fired one by a light rifle and another by a heavy rifle with the same force. Which rifle will hurt the shoulder more and why?

Two friends on roller-skates are standing 5 m apart facing each other. One of them throws a ball of 2 kg towards the other, who catches it, How will this activity affect the position of the two? Explain your answer.

Derive the unit of force using the second law of motion. A force of 5 N produces an acceleration of 8 m s^–2 on a mass m₁ and an acceleration of 24 m s^–2 on a mass m₂. What acceleration would the same force provide if both the masses are tied together?

Law of gravitation gives the gravitational force between

A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car

What is power? How do you differentiate kilowatt from kilowatt-hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of waterfalls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s^–2)

Sound travels in the air if

Infrasound can be heard by

The biotic component of the biosphere is not constituted by

All the living organisms are basically made up of C, N, S, P, H and O. How do they enter the living forms? Discuss.

In agricultural practices, higher input gives a higher yield. Discuss how?

Write the modes by which insects affect the crop yield.

Give reasons:

A wooden table should be called a solid.

What is meant by a substance?

List the points of differences between homogeneous and heterogeneous mixtures with examples.