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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
The first metal used by man was
- A. iron
- B. copper
- C. gold
- D. bronze
The hydroponic ion is
- A. H+
- B. HO -
- C. H2+
- D. H3O+
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The most Electropositive elements among the following is
- A. Na
- B. Ca
- C. K
- D. Cs
The nucleus of an atom consists of
- A. electrons and neutrons
- B. electrons and protons
- C. protons and neutrons
- D. All of the above
The number of moles of solute present in 1 kg of a solvent is called its
- A. molality
- B. morality
- C. normality
- D. formality
The most Electronegative element among the following is
- A. sodium
- B. bromine
- C. fluorine
- D. oxygen
The metal used to recover copper from a solution of copper Sulphate is
- A. Na
- B. Ag
- C. Hg
- D. Fe
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
- A. p-electrons in Ne(Z = 10)
- B. s-electrons in Mg(Z = 12)
- C. d-electrons in Fe(Z = 26)
- D. p-electrons in CI(Z = 17)
The inherited traits of an organism are controlled by
- A. RNA molecules
- B. Nucleotide
- C. DNA molecules
- D. enzymes
The heat energy produced when the human body metabolises 1 gram of fat is
- A. 30 KJ
- B. 1 KJ
- C. 39 KJ
- D. 29 KJ
What are the number of moles of CO2 which contains 16 g of oxygen?
- A. 0.5 mole
- B. 0.2 mole
- C. 0.4 mole
- D. 0.25 mole
Note:- One mole of CO2 has mass of 44 g and 32 g of O2. So 16 g of O2 have 22 g of CO2 or 0.5 moles of it.
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The gas used in the manufacture of vanaspati from vegetable oil is
- A. hydrogen
- B. oxygen
- C. nitrogen
- D. carbon dioxide
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-
Ans- A
The metallurgical process in which a metal is obtained in a fused state is called
- A. smelting
- B. roasting
- C. calcinations
- D. froth floatation
The most abundant rare gas in the atmosphere is
- A. He
- B. Ne
- C. Ar
- D. Xe
The Latin word formica means ant. The name formic acid is derived from this Latin word because
- A. this acid, in ancient times, was used to eliminate ant-hills
- B. this corrosive acid is secreted by ants to drive away their enemies
- C. this acid was first obtained by the distillation of ants
- D. ants are attracted by the odour of this acid
The ore which is found in abundance in India is
- A. monazite
- B. fluorspar
- C. bauxite
- D. magnetite
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