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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
Ans-   D

The first metal used by man was

  • A.    iron
  • B.    copper
  • C.    gold
  • D.    bronze
Ans-   B

The hydroponic ion is

  • A.    H+
  • B.    HO -
  • C.    H2+
  • D.    H3O+
Ans-   D

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The most Electropositive elements among the following is

  • A.    Na
  • B.    Ca
  • C.    K
  • D.    Cs
Ans-   D

The nucleus of an atom consists of

  • A.    electrons and neutrons
  • B.    electrons and protons
  • C.    protons and neutrons
  • D.    All of the above
Ans-   C

The number of moles of solute present in 1 kg of a solvent is called its

  • A.    molality
  • B.    morality
  • C.    normality
  • D.    formality
Ans-   A   

The most Electronegative element among the following is

  • A.    sodium
  • B.    bromine
  • C.    fluorine
  • D.    oxygen
Ans-   C

The metal used to recover copper from a solution of copper Sulphate is

  • A.    Na
  • B.    Ag
  • C.    Hg
  • D.    Fe
Ans-   D   

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)
Ans-   D

The inherited traits of an organism are controlled by

  • A.    RNA molecules
  • B.    Nucleotide
  • C.    DNA molecules
  • D.    enzymes
Ans-   C

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
Ans-   C

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
Ans-   A
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
Ans-   A

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
Ans-   A

The most abundant rare gas in the atmosphere is

  • A.    He
  • B.    Ne
  • C.    Ar
  • D.    Xe
Ans-   C

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
Ans-   C

The ore which is found in abundance in India is

  • A.    monazite
  • B.    fluorspar
  • C.    bauxite
  • D.    magnetite
Ans-   A

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