English Medium कक्षा ९ - CBSE Question Bank Solutions

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.

Chlorine exists in two isotopic forms, \[\ce{Cl-37}\] and \[\ce{Cl-35}\] but its atomic mass is 35.5. This indicates the ratio of \[\ce{Cl-37}\] and \[\ce{Cl-35}\] is approximately

An atom having atomic mass number 13 has 7 neutrons. What is the atomic number of the atom?

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?

What is the momentum of an object of mass m, moving with a velocity v?

Why does an object float or sink when placed on the surface of water?

Why does a block of plastic released under water come up to the surface of water?

The volume of 50 g of a substance is 20 cm³. If the density of water is 1 g cm⁻³, will the substance float or sink?