Test Paper Of Class 7 Science Chemistry Chapter 6 Physical And Chemical Changes
Chapter 6 Test Paper (01)
Class 7 Science Chemistry Chapter 6 Physical And Chemical Changes Test Paper Set-1 Text Form:-
SAMPLE PAPER (01)
CLASS: 7 MAX.MARKS :30
SUBJECT: SCIENCE (Bio) TIME: 1:30 HOUR
CH: 6 (Physical And Chemical Changes)
I. All questions are compulsory.
II. This question paper contains 18 questions divided into three Sections:- A, B, and C.
III. Section A has 10 questions of 1 mark each. Section B has 4 questions of 2 mark each and Section C has 4 questions of 3 mark each.
(Section – A)
In Questions 1 to 10, there are four options, out of which one is correct. Write the correct answer.
1. Which of the following is a physical change?
A. Photosynthesis B. Melting of steel
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C. Burning of wood D. Radioactive decay
2. The gas we use in the kitchen is called liquified petroleum gas (LPG). In the cylinder it exist as a liquid. When it comes out from the cylinder it becomes a gas (Change-A) then it burns (Change-B). The following statements pertain to these changes.
Choose the correct one.
(i) Process – A is a chemical change.
(ii) Process – B is a chemical change.
(iii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change.
3. Steel is preferred over iron in construction of ships because:
A. melting point of steel is higher than iron
B. steel is more uniform than iron
C. steel does not rust
D. tensile strength of steel is not high
4. Which of the following is a physical change?
(a) Rusting of iron
(b) Combustion of magnesium ribbon
(c) Burning of candle
(d) Melting of wax
5. When magnesium is burnt in air, the weight of magnesium:
C. remains same
D. Depends on the atmosphere
6. A man painted his main gate made up of iron, to
(i) prevent it from rusting.
(ii) protect it from sun.
(iii) make it look beautiful.
(iv) make it dust free.
7. Which of the above statement(s) is/are correct?
(a) (i) and (ii) (b) (ii) and (iii)
(c) only (ii) (d) (i) and (iii)
8. The reacting surface is reduced when the particle size is:
A. small B. large
C. moderate D. both a and c
9. Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
(a) physical change that can be reversed.
(b) chemical change that can be reversed.
(c) physical change that cannot be reversed.
(d) chemical change that cannot be reversed
10. Which of the following changes is NOT a chemical change?
A. Boiling of water
B. Boiling of egg
C. Burning of paper
D. Burning of cloth
(Section – B)
11. How would you show that setting of curd is a chemical change?
12. Describe how crystals of copper sulphate are prepared.
13. Explain how painting of an iron gate prevents it from rusting.
14. When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
(Section – C)
15. State whether the following statements are true or false:
(a) When a candle burns, both physical and chemical changes take place.
(b) Anaerobic bacteria digest animal waste and produce biogas.
(c) Ships suffer a lot of damage though they are painted.
(d) Stretching of rubber band is not a physical change.
16. Give two examples for each of the following cases:
(a) Physical changes which are reversible.
(b) Physical changes which are not reversible.
(c) Chemical changes.
17. If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(a) Do you think rust is different from iron?
(b) Can you change rust back into iron by some simple method?
(c) Do you think formation of rust from iron is a chemical change?
(d) Give two other examples of a similar type of change
18. Write word equations for two chemical reactions with the help of materials given in the box.
(Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water)