List of top Questions asked in CBSE Class IX

What is Behrman’s masterpiece? What makes Sue say so?
Two circles of radii 5 cm and 3 cm intersect at two points and the distance between their centres is 4 cm. Find the length of the common chord.
Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.
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.
ABC and ADC are two right triangles with common hypotenuse AC. Prove that ∠ CAD = ∠ CBD.
How does the poet imagine her to be, after death? Does he think of her as a person living in a very happy state (a ‘heaven’)? Or does he see her now as a part of nature? In which lines of the poem do you find your answer?
Do you think the feeling of depression Johnsy has is common among teenagers?
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?
What do you think Dinamani is the name of? Give a reason for your answer.
Find three different irrational numbers between the rational numbers \(\frac{5}{7}\) and \(\frac{9}{11}\).
Why did Margie’s mother send for the County Inspector?
Represent √9.3 on the number line
What do you think happens in the end? Does the child find his parents?
Have you seen anybody winnow grain at home or in a paddy field? What is the word in your language for winnowing? What do people use for winnowing? (Give the words in your language, if you know them.)
What did Margie write in her diary?
Answer the question in few words or in couple of sentences.
How old are Margie and Tommy?
Answer the question in few words or couple of sentences.
Convert the following temperatures to the Celsius scale.
(a) 293 K
(b) 470 K
Factorise: 27x3+y3+z3–9xy.
Why was Margie doing badly in geography? What did the County Inspector do to help her?
What does Vikram Seth compare to the quills of a porcupine?
The following data on the number of girls (to the nearest ten) per thousand boys in different sections of Indian Society is given below:

Section    

Number of girls per thousand boys

Scheduled Caste (SC)

940 

Scheduled Tribe (ST)

970

Non-SC/ST    

920

Backward districts 

950

Non-backward districts   

920

Rural    

930

Urban 

910

(i) Represent the information above by a bar graph.
(ii) In the classroom discuss what conclusions can be arrived at from the graph.

Arrange the following substances in increasing order of forces of attraction between the particles— water, sugar, oxygen.
An athlete completes one round of a circular track of diameter  \(200 \;m\) in \(40 \;s\). What will be the distance covered and the displacement at the end of \(2\) minutes \(20\) \(s\)?

Use suitable identities to find the following products: 

(i) (x + 4) (x + 10) 

(ii) (x + 8) (x – 10) 

(iii) (3x + 4) (3x – 5) 

(iv) \((y^ 2 + \frac{3 }{ 2}) (y^ 2 – \frac{3 }{ 2}) \)

(v) (3 – 2x) (3 + 2x)

Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?