Question 1 : The heat required to raise the temperature of body by 1 K is called
1. specific heat
2. thermal capacity
3. water equivalent
4. None of the above
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Question 2 : The method that cannot be used for removing permanent hardness of water is
1. adding sodium carbonate
2. distillation
3. adding caustic soda
4. boiling
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Question 3 : The major constituent of air is
1. nitrogen
2. carbon dioxide
3. oxygen
4. hydrogen
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Question 4 : The most electropositive elements among the following is
1. Na
2. Ca
3. K
4. Cs
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Question 5 : Zone refining is used for the purification of
1. Au
2. Ge
3. Ag
4. Cu
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Question 6 : The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
1. carbon
2. hydrogen
3. oxygen
4. nitrogen
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Question 7 : The luster of a metal is due to
1. its high density
2. its high polishing
3. its chemical inertness
4. presence of free electrons
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Question 8 : The maximum number of covalent formed by nitrogen is
1. 1
2. 2
3. 3
4. 4
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Question 9 : The most abundant rare gas in the atmosphere is
1. He
2. Ne
3. Ar
4. Xe
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Question 10 : The gas used for artificial ripening of green fruit is
1. ethylene
2. ethane
3. carbon dioxide
4. acetylene
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