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1. Question marks are mentioned with each Question.
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5. This is a ONE TIME attempt test. Once started, it cannot be reversed or attempted again.
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1
When no new substance is formed after the change, it is called ___________ change.
Physical
Chemical
Both (a) and (b) are correct.
None of these.
2
Reversible change is a ____________________ change.
Permanent
Temporary
3
Which of the following shows reversible change ?
Cooking of food.
Burning of paper.
Melting of ice.
4
When a new substance is formed after the change, it is called __________________change.
5
Which of the following process can be interrupted by humans ?
Night becomes day
Cooking of food
Weather change
Plant becomes tree
6
What are the examples of physical change ?
Formation of dew
Bending of glass tube
Crushing of iron
All of these.
7
Which of the following are a natural change ?
Burning of oil
Weaving of clothes
8
There are many materials that ________________ on heating and __________________ on cooling.
Expand, Expand
Expand, Contract.
Contract, Expand
9
When a new substance is formed after the change, it is called _______________ .
Physical change
Chemical change
Reversible change
None of these ,
10
Which of the following are correct :
(a) When a goldsmith hammers a piece of gold, he makes intricate designs on it.
(b) Force can bring changes in certain things.
Only (a) is correct.
Only (b) is correct.
11
Which of the following are chemical change ?
Reddish – Brown Decomposition on Iron Objects
Browning of Vegetables and Fruit Surface
Reaction Between Vinegar and Baking Soda
12
(a) Some changes like night becomes day are natural and not under the control of human beings.
(b) Some changes like cooking of food are man made.
13
When vinegar and baking soda is reacted , then formation of ____________________, water and other substances take place.
Oxygen
Carbon dioxide
Sulphur dioxide
Nitrogen dioxide
14
(a) When a potter applies force on a lump of soil, he gives shape to the lump.
(b) When a goldsmith hammers a piece of gold, he makes intricate designs on it.
(c) When a ball of dough it pressed with the rolling pin, it turns into flat bread; which is ready to cook.
Only (a) and (b) are correct.
Only (b) and (c) are correct.
Only (a) and (c) are correct.
15
(a) Burning of match stick is a fast change.
(b) Burning of match stick is a slow change.
(c) Rusting of iron is a slow change.