Q71. Which of the following is an element?
(A) Alumina
(B) Silica
(C) Brass
(D) Graphite
(D) Graphite
Q72. Which of the following is used as a lubricant?
(A) Silica
(B) Iron oxide
(C) Graphite
(D) Diamond
(C) Graphite
Q73. Red Planet is known as-
(A) Mercury
(B) Venus
(C) Mars
(D) Saturn
(C) Mars
Q74. Sphygmomanometer measures blood pressure in?
(A) Writer
(B) Veins
(C) Arteries
(D) Eyes
(C) Arteries
Q75. Which of the following has the greatest impact on the ‘greenhouse effect’?
(A) Ozone
(B) Carbon monoxide
(C) Water vapour
(D) Carbon dioxide
(D) Carbon dioxide
Q76. What do we use for fire fighting?
(A) Hydrogen
(B) Carbon dioxide
(C) Carbon monoxide
(D) Marsh gas
(B) Carbon dioxide
Q77. The polluting gas emitted from vehicles is mainly-
(A) Carbon dioxide
(B) Marsh gas
(C) Carbon monoxide
(D) Nitrogen oxide
(C) Carbon monoxide
Q78. The number of bones in an adult human body is
(A) 214
(B) 206
(C) 253
(D) 310
(B) 206
Q79. Which of the following is not a variety of coal?
(A) Bituminous
(B) Lignite
(C) Peat
(D) Dolomite
(D) Dolomite
Q80. Which of the following is not a ‘carboxylic acid’?
(A) Picric acid
(B) Formic acid
(C) Citric acid
(D) Tartaric acid
(A) Picric acid