List of top Questions asked in CBSE Class VIII

Identify the part which vibrates to produce sound in the following instruments.

Dholak
Sitar
Flute

Explain why sliding friction is less than static friction.

The process that you saw in Activity 11.7 is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transfered to the thin copper plate. Which electrode should be attached to the positive terminal of the battery and why?

Subtract 4p²q – 3pq + 5pq² – 8p + 7q – 10 from 18 – 3p – 11q + 5pq – 2pq² + 5p²q

(a) Find out the position of the image of an object situated at A in the plane mirror.
(b) Can Paheli at B see this image?
(c) Can Boojho at C see this image?
(d) When Paheli moves from B to C, where does the image of A move?

Add the following. l² + m², m² + n², n² + l², 2lm + 2mn + 2nl

Complete the following table of products:

First monomial → Second monomial ↓	2x	–5y	3x²	– 4xy	7x² y	–9x² y²
2x	4x²	. . .	. . .	. . .	. . .	. . .
–5y	. . .	. . .	-15x²y	. . .	. . .	. . .
3x²	. . .	. . .	. . .	. . .	. . .	. . .
– 4xy	. . .	. . .	. . .	. . .	. . .	. . .
7x² y	. . .	. . .	. . .	. . .	. . .	. . .
–9x² y²	. . .	. . .	. . .	. . .	. . .	. . .

Subtract 3xy + 5yz – 7zx from 5xy – 2yz – 2zx + 10xyz

Explain how a square is.

a quadrilateral
a parallelogram
a rhombus
a rectangle

Explain why a charged body loses its charge if we touch it with our hand.

Fill in the blanks in the sentences below (the verbs given in brackets will give you a clue).

(i) The earth trembled, but not many people felt the ____. (tremble)

(ii) When the zoo was flooded, there was a lot of _____ and many animals escaped into the countryside. (confuse)

(iii) We heard with _____ that the lion had been recaptured. (relieve)

(iv) The zookeeper was stuck in a tree and his _____ was filmed by the TV crew. (rescue)

(v) There was much _____ in the village when the snake charmer came visiting. (excite)

Underline the verbs and arrange them in two columns, Past and Earlier past.

(a) My friends set out to see the caves in the next town, but I stayed at home, because I had seen them already.

(b) When they arrived at the station, their train had left. They came back home, but by that time I had gone out to see a movie!

(c) So they sat outside and ate the lunch I had packed for them.

(d) By the time I returned, they had fallen asleep!

Past	Earlier Past

Boojho stands at A just on the side of a plane mirror as shown in Fig.

Can he see himself in the mirror? Also, can he see the image of objects situated at P, Q and R?

Solve the linear equation: \(\frac{3t-2}{4}-\frac{2t+3}{3}=\frac{2}{3}-t\)

Fill in the blanks using the correct form of the verbs in brackets.

My little sister is very naughty. When she ____ (come) back from school yesterday, she had _____(tear) her dress. We _____(ask) her how it had _____(happen). She ______(say) she _____ _____ (have, quarrel) with a boy. She _____ _____ (have, beat) him in a race and he _____ ____ (have, try) to push her. She _____ ____ (have, tell) the teacher and so he _____ _____ (have, chase) her, and she _____ _____ (have, fall) down and _____ _____ (have, tear) her dress.

A 5 m 60 cm high vertical pole casts a shadow 3 m 20 cm long. Find at the same time -
(i) the length of the shadow cast by another pole 10 m 50 cm high
(ii) the height of a pole which casts a shadow 5 m long.

Define asexual reproduction. Describe two methods of asexual reproduction in animals.

Mention the various ways in which the British and the German soldiers become friends and find things in common at Christmas.

In the following situations identify the agent exerting the force and the object on which it acts. State the effect of the force in each case.
1. Squeezing a piece of lemon between the fingers to extract its juice.
2. Taking out paste from a toothpaste tube.
3. A load is suspended from a spring while its other end is on a hook fixed to a wall.
4. An athlete making a high jump to clear the bar at a certain height.

Sketch larynx and explain its function in your own words.

Match the organisms in Column A with their action in Column B.

A		B
(i)	Bacteria	(a)	Fixing nitrogen
(ii)	Rhizobium	(b)	Setting of curd
(iii)	Lactobacillus	(c)	Baking of bread
(iv)	Yeast	(d)	Causing malaria
(v)	A protozoan	(e)	Causing cholera
(vi)	A virus	(f)	Causing AIDS
		(g)	Producing antibodies

Simplify.
(i) (x²– 5) (x + 5) + 25
(ii) (a²+ 5) (b³+ 3) + 5
(iii) (t + s²)(t² – s)
(iv) (a + b) (c – d) + (a – b) (c + d) + 2 (ac + bd)
(v) (x + y) (2x + y) + (x + 2y) (x – y)
(vi) (x + y) (x²– xy + y²)
(vii) (1.5x – 4y) (1.5x + 4y + 3) – 4.5x + 12y
(viii) (a + b + c) (a + b – c)

Which words in the list below describe Sanjeev, in your opinion? (Look up the dictionary for words that you are not sure of.)

cheerful	ambitious	brash	brave	careless
heroic	selfless	heartless	humorous	-

Use words from the list to complete the three sentences below.

(i) I don’t know if Sanjeev was cheerful, _____ or _____.

(ii) I think that he was very brave,____ and_____.

(iii) Sanjeev was not heartless, _____or_____.

In the tsunami 150,000 people died. How many animals died?

Change the following sentences into indirect speech.

(i) First man: We must educate our brothers. Second man: And try to improve their material conditions. Third man: For that we must convey our grievances to the British Parliament. The first man said that _____ _____ The second man added that _______ ________ The third man suggested that ________ ________

(ii) First soldier: The white soldier gets huge pay, mansions and servants. Second soldier: We get a pittance and slow promotions. Third soldier: Who are the British to abolish our customs? The first soldier said that _______ __________ The second soldier remarked that _______ ________ The third soldier asked _______ _______

List of top Questions asked in CBSE Class VIII

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