English Medium Class 9 - CBSE Question Bank Solutions for Science

Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

Food grains are getting dried in the sun.

The property to flow is unique to fluids. Which one of the following statements is correct?

You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with well labelled diagram.

In desert plants, rate of water loss gets reduced due to the presence of

Flexibility in plants is due to

Differentiate the following activities on the basis of voluntary (V) or involuntary (IV) muscles.

Jumping of frog

Differentiate the following activities on the basis of voluntary (V) or involuntary (IV) muscles.

Pumping of the heart

______ have tubular cells with perforated walls and are living in nature.

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