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90155121. What happens when a chemical bond is formed?
A
energy is always absorbedB
energy in always releasedC
more energy is released than is absorbedD
energy is neither released nor absorbedCorrect Answer: A. energy is always absorbed
90105122. The chief constituent of vinegar is
A
Formic acidB
Acetic acidC
Salicylic acidD
Oxalic acidCorrect Answer: B. Acetic acid
90201123. Which one of the following pairs is NOT correctly matched?
A
Haematite : CopperB
Bauxite : AluminiumC
Monazite : ThoriumD
Pitchblende : UraniumCorrect Answer: A. Haematite : Copper
90202124. Which one of the following statements is not correct? Vulcanisation of rubber makes it
A
soft and flexibleB
strong and hardC
chemical resistantD
withstand higher temperaturesCorrect Answer: A. soft and flexible
90019125. Bleaching powder IA used in drinking water as a/an
A
disinfectant.B
antibioticC
antisepticD
coagulantCorrect Answer: A. disinfectant.
90006126. Among the following iron ores, the highest percentage of iron content is found in
A
HacmctiteB
MagnetiteC
LimoniteD
None of theseCorrect Answer: A. Hacmctite
90113127. The fuel used in an atomic reactor is
A
CoalB
PetrolC
Combustible gasesD
UraniumCorrect Answer: D. Uranium
90110128. The element which is commonly used in nuclear for producing electricity by nuclear fission is
A
RadiumB
PlutoniumC
UraniumD
DeuteriumCorrect Answer: C. Uranium
90093129. Steel contains
A
0.1 - 2% carbonB
5 - 10% carbonC
more than 10% carbonD
no carbonCorrect Answer: A. 0.1 - 2% carbon
90025130. Carbon monoxide is an inflammable gas. Which one of the following is also inflammable?
A
HeliumB
NitrogenC
OxygenD
HydrogenCorrect Answer: D. Hydrogen
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