English Medium Class 9 - CBSE Question Bank Solutions for Science

A truck of mass M is moved under a force F. If the truck is then loaded with an object equal to the mass of the truck and the driving force is halved, then how does the acceleration change?

When a body falls freely towards the earth, then its total energy

Which one of the following is not the unit of energy?

The work done on an object does not depend upon the

The weight of a person on planet A is about half that on the earth. He can jump up to 0.4 m in height on the surface of the earth. How high he can jump on planet A?

A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back? (g = 10 m s^–2)

Which one of the following is not a bacterial disease?

Which one of the following diseases is caused by protozoans?

Which of the following can make you ill if you come in contact with an infected person?

Which one of the following is not important for individual health?

Choose the wrong statement

You are aware of Polio Eradication Programme in your city. Children are vaccinated because

Give two examples for each of the following

Acute diseases

Give two examples for each of the following

Chronic diseases

Give two examples for each of the following

Infectious diseases

Give two examples for each of the following

Non-infectious diseases

Pneumonia is an example of ______ disease.

Many skin diseases are caused by ______.

Antibiotics commonly block biochemical pathways important for the growth of ______.

Living organisms carrying the infecting agents from one person to another are called ______.