Q.31 In oxygen, things:
(A) burn dimly
(B) burn brightly
(C) do not burn at all
(D) burn rapidly and are immediately reduced to ashes
Q.32 Liquefied Petroleum Gas (LPG) consists of mainly :
(A) methane, ethane and hexane
(B) ethane, butane and propane
(C) ethane, hexane and nonane
(D) nonane, ethane and hexane
Q.33 The gas produced by pouring water on calcium carbide is :
(A) Pentane
(B) Methane
(C) Ethane
(D) Acetylene
Q.34 Which of the following gases is considered a better substitute to air in car tyres?
(A) Hydrogen
(B) Nitrogen
(C) Helium
(D) Oxygen
Q.35 Which of the following noble gases is most abundant in Earth's atmosphere?
(A) Argon
(B) Xenon
(C) Helium
(D) Neon
Q.36 Which of the following phenomena cannot be observed on the surface of the Moon?
(A) Rising and setting of the Sun
(B) Solar eclipse
(C) Motion of comets
(D) Twinkling of stars
Q.37 Which of the following planets has a revolution time which is shorter than its rotation time?
(A) Jupiter
(B) Venus
(C) Mars
(D) Uranus
Q.38 Which planet looks reddish in the night sky?
(A) Jupiter
(B) Saturn
(C) Mars
(D) Mercury
Q.39 Which female astronaut spent the maximum time in space?
(A) Lisa Norwak
(B) Kalpana Chawla
(C) Sunita Williams
(D) None of these
Q.40 Which planet has the fastest revolution time?
(A) Mercury
(B) Uranus
(C) Neptune
(D) Jupiter
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