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.