English Medium कक्षा ९ - CBSE Question Bank Solutions for Science

Give True (T) and False (F)

Funaria is a moss.

Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do.

Common cold is ______ disease.

Classify the following diseases as infectious or non-infectious.

1. AIDS
2. Tuberculosis
3. Cholera
4. High blood pressure
5. Heart disease
6. Pneumonia
7. Cancer

Among the given options, which one is not correct for the use of large amounts of fertilisers and pesticides?

Total earth’s surface covered by water is

Rivers from land, add minerals to seawater. Discuss how?

How is the life of organisms living in water affected when water gets polluted?

In the coastal areas, wind current moves from the sea towards the land during the day; but during the night it moves from land to the sea. Discuss the reason.

Define Biofertilizer.

What are the limitations of J.J. Thomson’s model of the atom?

Why is the cell called the structural and functional unit of life?

If the organisation of a cell is destroyed due to some physical or chemical influence, what will happen?

Where are proteins synthesized inside the cell?

What is the quantity which is measured by the area occupied below the velocity-time graph?

Which of the following has more inertia:

1. a rubber ball and a stone of the same size?
2. a bicycle and a train?
3. a five-rupees coin and a one-rupee coin?

In the following example, try to identify the number of times the velocity of the ball changes:

“A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team”.

Also identify the agent supplying the force in each case.

Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.

Why do you fall in the forward direction when a moving bus brakes to a stop and fall backwards when it accelerates from rest?

Why is it advised to tie any luggage kept on the roof of a bus with a rope?