1.  A fertile material is the one, which can be

a

  fissioned by fast neutrons.

b

 fissioned by slow (thermal) neutrons.

c

 fissioned by either slow or fast neutrons.

d

 converted into fissile material on absorption of neutron.

Answer & Explanation
Answer : Option D

2.  Radioactive decay is a change.

a

  nuclear

b

 physical

c

 chemical

d

 none of these

Answer & Explanation
Answer : Option A

3.  Nuclides having the same atomic numbers are termed as

a

  isobars

b

 isomers

c

 isotopes

d

 isotones

Answer & Explanation
Answer : Option B

4.  Activity is proportional to number of

a

  father nuclei

b

 decayed nuclei

c

 daughter nuclei

d

 undecayed nuclei

Answer & Explanation
Answer : Option D

5.  Which one is different for the neutral atoms of the isotopes of an element?

a

  Atomic numbers

b

 Atomic weights

c

 Number of protons

d

 Number of electrons

Answer & Explanation
Answer : Option B

6.  Which of the following ores contains maximum percentage of uranium?

a

  Thorium

b

 Rescolite

c

 Carnotite

d

 Pitchblende

Answer & Explanation
Answer : Option D

7.  A radioactive isotope undergoes decay with respect to time following law.

a

  linear

b

 logarithmic

c

 exponential

d

 inverse square

Answer & Explanation
Answer : Option C

8.  Pick out the wrong statement.

a

  Positron is heavier than a proton.

b

 A, b-ray particle is identical with an electron.

c

 The nucleus of a hydrogen atom is identical with a proton.

d

 Mass of an electron is about 1/1800th of the lightest nucleus.

Answer & Explanation
Answer : Option A

9.  The second underground nuclear test was conducted by India at

a

  Narora

b

 Pokhran

c

 Jaisalmer

d

 Kalpakkan

Answer & Explanation
Answer : Option B

10.  Unit of radioactivity is

a

  barn

b

 curie

c

 fermi

d

 angstrom

Answer & Explanation
Answer : Option B

11.  Radioactive substances can be produced readily in

a

  A transistor

b

 An atomic pile

c

 An electron gun

d

 A Wilson cloud chamber

Answer & Explanation
Answer : Option B

12.  In an atomic explosion, enormous energy is released which is due to

a

  Conversion of mass into energy

b

 Conversion of neutrons into protons

c

 Conversion of chemical energy into heat energy

d

 Conversion of mechanical energy into nuclear energy

Answer & Explanation
Answer : Option A

13.  Which of the following may not need a control rod?

a

  Candu reactor.

b

 Fast breeder reactor.

c

 Liquid metal cooled reactor.

d

 None of these.

Answer & Explanation
Answer : Option D

14.  Graphite is used in nuclear reactor as

a

  fuel

b

 lubricant

c

 insulation lining of the reactor.

d

 retarder of neutron velocity.

Answer & Explanation
Answer : Option D

15.  Nuclear fuel complex, Hyderabad is engaged in the job of

a

  treatment of spent fuel.

b

 processing of uranium ore.

c

 manufacture of nuclear fuel elements/assemblies .

d

 none of these.

Answer & Explanation
Answer : Option C

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