Science - MCQs
CBSE Class 10
Q1: Optical density of a medium depends on
(a) Density of the medium
(b) Thickness of the medium
(c) Velocity of light in that medium
(d) None of these
Q2: Which of the following is not a physical change?
(a) Boiling of water to give water vapour
(b) Melting of ice to give water
(c) Dissolution of salt in water
(d) Combustion of Liquefied Petroleum Gas (LPG)
Q3: Which of the following is correct about chromosomes?
(a) It is composed of DNA and lipids.
(b) It is composed of DNA and proteins.
(c) It is composed of DNA only.
(d) It is composed of RNA and proteins.
Q4: Which of the following salts does not contain water of crystallisation?
(a) Blue vitriol
(b) Baking soda
(c) Washing soda
(d) Gypsum
Q5: Acetic acid was added to a solid X taken in a test tube. A colourless and odourless gas was evolved. The gas was passed through lime water which did not turn milky. However the gas burnt with a pop sound. It can be concluded that:
(a) X is sodium and the gas evolved is CO₂,
(b) X is sodium and the gas evolved is H₂,
(c) X is sodium acetate and the gas evolved is CO₂,
(d) X is sodium chloride and the gas evolved is H₂.
Q6: No matter how far you stand from a mirror, your image appears erect. The mirror may be:
(a) plane
(b) concave
(c) convex
(d) either plane or convex
Q7: The least distance of distinct vision for young adult with normal vision is about.
(a) 25 m
(b) 2.5 cm
(c) 25 cm
(d) 2.5 m
Q8: An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be :
(a) calcium
(b) carbon
(c) silicon
(d) iron
Q9: An ammeter has 20 divisions between 0 mark and 2 A mark on its scale. The least count of this ammeter is:
(a) 0.01 A
(b) 0.02 A
(c) 0.1 A
(d) 0.2 A
Q10: The blue colour of sky is due to:
(a) refraction of light
(b) dispersion of light
(c) diffraction of light
(d) scattering of light
Answers:
1: (c) Velocity of light in that medium
2: (d) Combustion of Liquefied Petroleum Gas (LPG)
3: (b) It is composed of DNA and proteins.
4: (b) Baking soda
5: (b) X is sodium and the gas evolved is H₂,
6: (d) either plane or convex
7: (c) 25 cm
8: (a) calcium
9: (c) 0.1 A
10: (d) scattering of light
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