Question 1.1
Which of the following is not a greenhouse gas?
(a) methane
(b) water vapour
(c) carbon dioxide
(d) oxygen
Question 1.2
Which of the following is the SI unit of pressure?
(a) Nm2
(b) Nm-2
(c) Nm
(d) N
Question 1.3
The vapour density of a gas is 32. Which of the following is its molecular weight?
(a) 8
(b) 16
(c) 32
(d) 64
Question 1.4
On which of the following does the thermal conductivity of a metal depend?
(a) temperature
(b) length
(c) nature of the material
(d) area of cross-section
Question 1.5
What is the relation between the radius of curvature and the focal length of a mirror?
(a) f = 2r
(b) f = r/2
(c) f = r/3
(d) f = 2r/3
Question 1.6
Which of the following colours deviates most when white light is refracted by a prism?
(a) red
(b) yellow
(c) Violet
(d) green
Question 1.7
Which of the following physical quantities represents ampere?
(a) coulomb-second
(b) volt-ohm-1
(c) volt-ohm
(d) volt-1Â ohm
Question 1.8
The resistivity of which of the following decreases with increase in temperature?
(a) conductor
(b) semiconductor
(c) superconductor
(d) insulator
Question 1.9
Which of the following is the correct order of ionising power for α, β and γ rays?
(a) α > β > γ
(b) α > γ > β
(c) γ > β > α
(d) β > α >γ
Question 1.10
Which of the following has the highest atomic radius?
(a) K
(b) H
(c) Li
(d) Na
Question 1.11
In which of the following a covalent bond is present?
(a) hydrogen chloride
(b) sodium chloride
(c) lithium hydride
(d) calcium oxide
Question 1.12
Which of the following is a weak electrolyte in aqueous solution?
(a) CH3COOH
(b) NaOH
(c) H2SO4
(d) NaCl