Q. The oil used in the froth floatation process is
(A)
coconut oil
(B)
olive oil
(C)
kerosene oil
(D)
pine oil
✅ Correct Answer: (D)
pine oil
Q. The number of waves in n x 10th Bohr's orbit are
(A)
n^2
(B)
n^-2
(C)
n
(D)
n^3
✅ Correct Answer: (B)
n^-2
Q. The mass of one Avogadro number of helium atom is
(A)
1.00 gram
(B)
4.00 gram
(C)
8.00 gram
(D)
4 x 6.02 x 10^23 gram
✅ Correct Answer: (D)
4 x 6.02 x 10^23 gram
Q. The items amenable to detection by soft x-rays are
(A)
contrabands
(B)
lead in bullets
(C)
narcotics
(D)
genuine coins from counterfeit coins
✅ Correct Answer: (D)
genuine coins from counterfeit coins
Q. The material which can be deformed permanently by heat and pressure is called a
(A)
thermoplastic
(B)
thermoset
(C)
chemical compound
(D)
polymer
✅ Correct Answer: (B)
thermoset
Q. The mass number of a nucleus is
(A)
always less than its atomic number
(B)
the sum of the number of protons and neutrons present in the nucleus
(C)
always more than the atomic weight
(D)
a fraction
✅ Correct Answer: (B)
the sum of the number of protons and neutrons present in the nucleus
Q. The inexpensive and commonly used variety of glass is called soda glass. It is called so because
(A)
was used initially for making bottles of soda(carbonated drink)
(B)
is made using soda(sodium carbonate)
(C)
was initially used for storing sodium carbonate
(D)
is made using soda lime
✅ Correct Answer: (B)
is made using soda(sodium carbonate)
Q. The gas used in the manufacture of vanaspati from vegetable oil is
(A)
hydrogen
(B)
oxygen
(C)
nitrogen
(D)
carbon dioxide
✅ Correct Answer: (A)
hydrogen
Q. The ionic radii of N3-, O2-, F- and Na+ follows the order
(A)
N3- > O2- > F- > Na+
(B)
N3- > Na+ > O2- > F-
(C)
Na+ > O2- > N3- > F-
(D)
O2- > F- > Na+ > N3-
✅ Correct Answer: (A)
N3- > O2- > F- > Na+
Q. The graphite rods in the nuclear reactor
(A)
react with U to release energy
(B)
produce neutrons
(C)
undergo combustion which triggers the nuclear fission
(D)
convert fast moving neutrons into thermal neutrons
✅ Correct Answer: (D)
convert fast moving neutrons into thermal neutrons
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