Class 7 - Chemistry Set 1

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FREE quick assessment test (20 Questions) by Improove. Plz visit www.improove.in

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1. Which among the following is a pure substance? *

1 point

Sand

NaCl

Air

Muddy water

2. The practice of consuming water at an optimum level without wasting it refers to___________. *

1 point

reuse

refuse

reduce

recycle

3. Which acid is used in fire-extinguishers? *

1 point

Hydrochloric acid

Acetic acid

Nitric acid

Sulphuric acid

4. Number of elements present in a water molecule. *

1 point

5. Neon is an example of *

1 point

metals

noble gas

halogens

none of these

6. Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. Which of the following would be the right gift for her to buy? *

1 point

Woollen shawl

Silk scarf

Animal fur cap

Leather jacket

7. What is tincture of iodine? *

1 point

Mixture of chlorine and alcohol

Mixture of iodine and chlorine

Mixture of iodine and water

None of these

8. When salt is mixed with ice which property is changed *

1 point

Boiling point

Freezing point

(1) & (2) both

None of these

9. Removing of fleece from a sheep is called *

1 point

sericulture

shearing

spunning

ginning

10. Which of the following is/are correct for wool? *

1 point

Wool does not insulate against heat and cold

Wool sticks to the skin when burnt

Wool is versatile

Wool is water loving

11. Which of the following is the correct statement? *

1 point

All solids are highly compressible

Liquids do not flow

Matter is not interchangeable

Gases can flow

12. Select the incorrect use of iron? *

1 point

For making bridges

For making surgical equipment

For making steel

For reinforced concrete

13. Which of the following is acidic in nature? *

1 point

Apple juice

Soap solution

Water

Sodium bicarbonate

14. CO2 dissolves in water to form *

1 point

C + H2 + O2

CH4O

CH3COOH

H2CO3

15. What is the common name for calcium oxide (CaO) ? *

1 point

Quick lime

Slacked lime

Baking soda

Soda ash

16. What will be the effect of methyl orange in acidic medium ? *

1 point

It changes into red colour

It changes into yellow colour

It changes into pink colour

No change

17. In a neutralized solution of salt *

1 point

concentration of hydronium ions is higher than hydroxyl ions

concentration of hydroxyl ions is higher than hydronium ions

concentration of hydronium ions is equal to hydroxyl ions

All of these

18. Which of the following is a protein fibre? *

1 point

Wool

Linen

Silk

Both (1) and (3)

19. Which of the following statements are true for pure substances ?(i) Pure substances contain only one kind of particles(ii) Pure substances may be compound or mixtures(iii) Pure substance have the same composition throughout(iv) Pure substances can be examplified by all elements other than nickel *

1 point

(i) and (ii)

(i) and (iii)

(iii) and (iv)

(ii) and (iii)

20. Sodium sulphate is *

1 point

K2CO3

Na2SO4

NaHCO3

NaOH

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