Question 31 : The isomerism which exists between CH₃CHCI₂ and CH₂CI. CH₂CI is
1. chain isomerism
2. functional group isomerism
3. positional isomerism
4. metamerism
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Question 32 : The main buffer system of the human blood is
1. H₂CO₃ - HCO₃
2. H₂CO₃ - CO₃^2-
3. CH₃COOH - CH₃COO^-
4. NH₂CONH₂ - NH₂CONH⁺
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Question 33 : The iron ore magnetite consists of
1. Fe₂O₃
2. Fe₃OH₄
3. FeCO₃
4. 3Fe₂O₃ .. 3H₂O
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Question 34 : The most extensive, commercially useful source of thorium as monazite sand occurs in India at
1. Orissa coast
2. Travancore coast
3. West Bengal coast
4. Gujarat coast
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Question 35 : The molecules of which gas have highest speed?
1. H₂ at -73^oC
2. CH₄ at 300 K
3. N₂ at 1[comma]027^oC
4. O₂ at 0^oC
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Question 36 : The octane number of zero is assigned to
1. 2-methyl octane
2. n-heptane
3. iso-octane
4. 3-methyl octane
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Question 37 : The items amenable to detection by soft x-rays are
1. contrabands
2. lead in bullets
3. narcotics
4. genuine coins from counterfeit coins
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Question 38 : The nuclear particles which are assumed to hold the nucleons together are
1. electrons
2. positrons
3. neutrons
4. mesons
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Question 39 : The hardest form of carbon is
1. coke
2. graphite
3. diamond
4. charcoal
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Question 40 : The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
1. 3 billion years
2. 100 years
3. 0.01 minute
4. 13 days
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