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Important Questions for Class 6 Science Chapter 6 Changes Around us



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Multiple Choice Questions

Question 1
Which of the following is a desirable and undesirable changes?
(a) Burning of House
(b) Floods
(c) Landslides
(d) Burning of cooking gas
(e) rusting of iron
(f) souring of milk
(g) rottening of fruits
(e) breaking of glass tumbler

Question 2
The process of converting solid directly into gas
(a) Condensation
(b) Sublimation
(c) Melting
(d) evaporation

Question 3
Which of the following is a slow and fast changes?
(a) burning of paper
(b) formation of coal
(c) growth of the baby
(d) Rusting of iron
(e) Burning a matchstick
(f) Switching on the bulb

Question 4
Which of the following is an example of non periodic change?
(a) earthquake
(b) Landslide
(c) truck accident
(d) Rotation of fan
(e) Movement of earth around sun
(f) Phases of moon

Question 5
The process of converting gas directly into solid?
(a) Condensation
(b) Sublimation
(c) decomposition
(d) evaporation

Question 6
Which one of these is not true?
(a)Change in which heat is given out is called exothermic changes.
(b) Changes that cannot be reversed is called irreversible changes
(c) Iron contracts on heating and expand on cooling
(d) None of these

Question 7
Which of the following is a reversible change?
(a) burning of forests
(b) Ripening of fruits
(c) burning of candle
(d) Melting of ice

Question 8
Match the column
(P) Changes in which heat is liberated
(X)chemical changes
(Q) change in which new substance is formed
(Y) Endothermic Changes
(R) changes take place by absorption of heat
(Z) exothermic changes
Which of these are correct?
(a) P -> X, Q -> Y, R -> Z
(b) P -> Y, Q -> X, R -> Z
(c) P -> Z, Q -> Y, R -> X
(d) P -> Z, Q -> X, R -> Y


Question 9
Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel, because on heating the iron rim
(a) expands and fits onto the wooden wheel.
(b) contracts and fits onto the wooden wheel.
(c) no change in the size takes place.
(d) expands first, then on cooling contracts and fits onto the wooden wheel.

Question 10
Salt can be separated from its solution (salt dissolved in water), because
(a) mixing of salt in water is a change that can be reversed by heating and melting of salt.
(b) mixing of salt in water is a change that cannot be reversed.
(c) mixing of salt in water is a permanent change.
(d) mixing of salt in water is a change that can be reversed by evaporation.


SHORT ANSWER TYPE QUESTION

Question 11
How to achieve tight fit of the handle in tools like iron axle?
Question 12
With the help of examples explain what is periodic and what is non periodic changes.
Question 13
Name few changes that Rajesh observed while burning a candle.
Question 14
A bag of cement & a bag of sand was mixed together with water. Was the change that occurred reversible or irreversible? Can we use any method of separation that you learned in previous chapter to separate those ingredients?
Question 15
Why do we classify the changes taking place around us?

HOTS

Question 16
Is recycling of paper/plastics or any other product is a reversible change?
Question 17
‘Though trees are planted after deforestation then can it be considered as a reversible change?’ Justify the statement
Question 18
list two irreversible physical changes.
Question 19
Do you think we break molecules when we turn chalk into chalk powder?
Question 20
Rashi while performing a chemistry experiment had put the hot test tube under cold water which immediately cracked. Why do you think the test tube cracked?


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Question 1 What is $\frac {1}{2} + \frac {3}{4}$ ?
A)$\frac {5}{4}$
B)$\frac {1}{4}$
C)$1$
D)$\frac {4}{5}$
Question 2 Pinhole camera produces an ?
A)An erect and small image
B)an Inverted and small image
C)An inverted and enlarged image
D)None of the above



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