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481.

Radioactivity is a natural disintegration of nuclei of heavy elements because only heavy elements
(a)Contain alpha particles
(b)Can have unstable nuclei with neutron : proton ration being quite uneven
(c)Contain excess of neutrons
(d)Can produce lead as the end product
Comment
Answer is: B

482.

Mean life of radioactive elements?
(a)Equal to half life
(b)Less than half life
(c)0.693 t(1/2)
(d)1.44 t(1/2)
Comment
Answer is: D

483.

Choose wrong statement.
(a)P32 is used in the treatment of Leukemia.
(b)I131 is used in the treatment of thyroid gland.
(c)Co59 can't be used for cancer treatment.
(d)Excessive use of radioactive elements is responsible for cancerous growth.
Comment
Answer is: A

484.

Which radioactive pollutant has recently drawn the attention of the public, due to its occurrence in the building material?
(a)Radium
(b)Plutonium
(c)Radon
(d)Thorium
Comment
Answer is: D

485.

Consider the following statements
Loss of beta particle is equivalent to
1. Increase in one proton only
2. Decrease in one neutron only
Which of the statement given above is/are correct?
(a)Only 1
(b)Only 2
(c)Both 1 and 2
(d)Neither 1 nor 2
Comment
Answer is: C

486.

Age of fossil may be found out by determining the ratio of two isotopes of Carbon. The isotopes are
(a)C-12 and C-13
(b)C-13 and C-14
(c)C-12 and C-14
(d)C-12 and Carbon black
Comment
Answer is: B

487.

The function of heavy water in a nuclear reactor is to
(a)Slow down the speed of neutrons
(b)Increase the speed of neutrons
(c)Cool down the reactor
(d)Stop the nuclear reactor
Comment
Answer is: A

488.

The origin of intermolecular forces is because of
(a)Attraction between polar molecules
(b)Forces between permanent dipole and induced dipole
(c)Dispersion forces due to distortion of electron clouds under the influences of nuclear of atoms
(d)All of above
Comment
Answer is: D

489.

What are the types of bonds present in CuSo4.5H2o?
(a)Electrovalent and covalent
(b)Electrovalent and coordinate
(c)Electrovalent, covalent, coordinate and hydrogen bond
(d)Covalent and coordinate covalent
Comment
Answer is: C

490.

Consider the following Statements.
1. Alcohol is non polar solvent.
2. Ionic compounds are insoluble in non polar solvent.
3. Ionic compounds do not conduct electricity in solid state.
Which of the statement given above are correct.
(a)1 and 2
(b)2 and 3
(c)1 and 3
(d)1, 2 and 3
Comment
Answer is: D

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