Nuclear Science MCQS

                          Nuclear Science MCQS

1.	Which of the following is used as a moderator in nuclear reactor?
	A. Thorium B. Graphite C. Radium D. Ordinary water Answer & Explanation Answer: Option B

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2.	Which among the following is a positively charged particle emitted by a radioactive element?
	A. Beta ray B. Alpha ray C. Cathode ray D. Gamma ray Answer & Explanation Answer: Option B

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3.	Atoms are composed of
	A. electrons and protons B. electrons only C. protons only D. electrons and nuclei Answer & Explanation Answer: Option D

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4.	In an atomic explosion, enormous energy is released which is due to
	A. conversion of chemical energy into heat energy B. conversion of mechanical energy into nuclear energy C. conversion of mass into energy D. conversion of neutrons into protons Answer & Explanation Answer: Option C

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5.	Isotopes are separated by
	A. crystallisation B. sublimation C. distillation D. filtration Answer & Explanation Answer: Option C

6.	The wavelength of X-rays is of the order of
	A. 10 micron B. 1 angstrom C. 1 cm D. 1 m Answer & Explanation Answer: Option B Explanation: 1 angstrom = 1.0 x 10-10 meters

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7.	Mesons are found in
	A. Laser beam B. X-rays C. Gamma rays D. Cosmic rays Answer & Explanation Answer: Option D

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8.	Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?
	A. Thorium B. Radium C. Plutonium D. Radan Answer & Explanation Answer: Option A

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9.	Which of the following shows the masses of the three elementary particles in decreasing order?
	A. Leptons, Baryons, Mesons B. Mesons, Baryons, Leptons C. Baryons, Mesons, Leptons D. Leptons, Mesons Baryons Answer & Explanation Answer: Option C

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10.	What is the wavelength of visible spectrum?
	A. 8500 - 9800 angstrom B. 7800 - 8000 angstrom C. 3900 - 7600 angstrom D. 1300 - 3000 angstrom Answer & Explanation Answer: Option C

11.	Which of the following has a least penetrating power?
	A. All have same penetrating power B. Beta Particles C. Alpha particles D. Gamma rays Answer & Explanation Answer: Option C

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12.	The isotope of uranium capable of sustaining chain reaction is
	A. U-235 B. U-245 C. U-239 D. U-238 Answer & Explanation Answer: Option A

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13.	The age of most ancient geological formations is estimated by
	A. Ra - Si method B. Potassium - argon method C. C14 method D. Uranium - lead method Answer & Explanation Answer: Option D

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14.	Who suggested that most of the mass of the atom is located in the nucleus?
	A. Thompson B. Bohr C. Rutherford D. Einstein Answer & Explanation Answer: Option C

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15.	The dark lines in the solar spectrum are due to
	A. absorption of corresponding wavelengths by the outer layers of the sun B. destructive interference between waves of certain definite wavelengths C. absorption of corresponding wavelengths by the prism used in the photograph D. absence of corresponding wavelengths from the light emitted by the core of the sun Answer & Explanation Answer: Option A

16.	In an atomic nucleus, neutrons and protons are held together by
	A. gravitational forces B. exchange forces C. coulombic forces D. magnetic forces Answer & Explanation Answer: Option B

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17.	'No two electrons in an atom can have the same set of four quantum numbers' is
	A. Newton's law B. Bohr's law C. Aufbau principle D. Pauli's exclusion principle Answer & Explanation Answer: Option D

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18.	According to Avogadro's Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called ____ .
	A. a molecule B. a cation C. an anion D. an atom Answer & Explanation Answer: Option A

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19.	Atoms of an element differ from those of all other elements in
	A. atomic number and electronic configuration B. number of neutrons and number of valence electrons C. atomic number and number of valence electrons D. number of neutrons and electronic configuration Answer & Explanation Answer: Option A

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20.	Nuclear fission is caused by the impact of
	A. neutron B. proton C. deuteron D. electron Answer & Explanation Answer: Option A

Which of the following rays are more penetrating?

A. Beta rays B. Alpha rays C. Gamma rays D. X-rays Answer & Explanation Answer: Option C

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22.	How many colours the sunlight spectrum has?
	A. Three B. Seven C. Four D. Five Answer & Explanation Answer: Option B

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