English Medium कक्षा ९ - CBSE Question Bank Solutions for Science

Complete the following chart:

What is the criterion for classification of organisms as belonging to kingdom Monera or Protista?

In which kingdom will you place an organism which is single-celled, eukaryotic and photosynthetic?

In the hierarchy of classification, which grouping will have the smallest number of organisms with a maximum of characteristics in common and which will have the largest number of organisms?

How would you choose between two characteristics to be used for developing a hierarchy in classification?

Explain the basis for grouping organisms into five kingdoms.

List any three reasons why you would think that you are sick and ought to see a doctor. If only one of these symptoms were present, would you still go to the doctor? Why or why not?

In which of the following case do you think the long-term effects on your health are likely to be most unpleasant?

• If you get jaundice,

• if you get lice,

• If you get acne.

Why?

What is the Differnece between speed and velocity ? 

Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?

What does the odometer of an automobile measure?

What does the path of an object look like when it is in uniform motion?

During an experiment, a signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal travels at the speed of light, that is, 3 × 10⁸m s⁻¹.

Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 30 seconds and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging?

1. from A to B and
2. from A to C?

Abdul, while driving to school, computes the average speed for his trip to be 20 km h⁻¹. On his return trip along the same route, there is less traffic and the average speed is 30 km h⁻¹. What is the average speed for Abdul’s trip?

What is the kinetic energy of an object?

Write an expression for the kinetic energy of an object.

The kinetic energy of an object of mass m moving with a velocity of 5 m s⁻¹ is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?

An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.

An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?