Which element is used in beauty parlours for hair setting?
(a) Carbon
(b) Methane
(c) Nitrogen
(d) Sulphur
From which mineral is radium obtained?
(a) Uranium
(b) Helium
(c) Carbon
(d) Oxygen
What is laughing gas?
(a) Carbon
(b) Nitrous Oxide
(c) Oxygen
(d) Hydrogen
Themost abundant elementin the Earth’s atmosphere is:
(a) Argon
(b) Nitrogen
(c) Oxygen
(d) Krypton
Which is thebrightest planetin our solar system?
(a) Moon
(b) Venus
(c) Mars
(d) Mercury
Red light is used in traffic signal because:
(a) It has the longest wavelength and can be easily noticed from a long distance
(b) It is beautiful
(c) It is visible to people even with bad eyesight
(d) None of these
Cloudy nights are warmer because:
(a) Clouds prevent radiation of heat from ground to air
(b) Of low atmospheric pressure
(c) Of the compact density of air
(d) More dust particles gather in the air
Which of the following is not a primary colour?
(a) Blue
(b) Green
(c) Red
(d) Black
Sound travels fastest through:
(a) Vacuum
(b) Steel
(c) Water
(d) Air
The chemical name of vitamin C is:
(a) Citric acid
(b) Ascorbic acid
(c) Oxalic acid
(d) Nitric acid