general knowledge general science nuclear science

1. Which of the following is used as a moderator in nuclear reactor?A.Thorium B.GraphiteC.Radium D.Ordinary waterAnswer & Explanation

Answer: Option B

Explanation:

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2. Which among the following is a positively charged particle emitted by a radioactive element?A.Beta rayB.Alpha rayC.Cathode rayD.Gamma rayAnswer & Explanation

Answer: Option B

Explanation:



3. Atoms are composed ofA.electrons and protonsB.electrons onlyC.protons onlyD.electrons and nucleiAnswer & Explanation

Answer: Option D

Explanation:



4. In an atomic explosion, enormous energy is released which is due toA.conversion of chemical energy into heat energyB.conversion of mechanical energy into nuclear energy

C.conversion of mass into energyD.conversion of neutrons into protonsAnswer & Explanation

Answer: Option C

Explanation:



5. Isotopes are separated byA.crystallisation B.sublimationC.distillation D.filtrationAnswer & Explanation

Answer: Option C6. The wavelength of X-rays is of the order of

A.10 micronB.1 angstromC.1 cmD.1 mAnswer & Explanation

Answer: Option B

Explanation:

1 angstrom = 1.0 x 10-10 meters


7. Mesons are found inA.Laser beamB.X-raysC.Gamma raysD.Cosmic raysAnswer & Explanation

Answer: Option D

Explanation:



8. Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?A.Thorium B.RadiumC.Plutonium D.RadanAnswer & Explanation

Answer: Option A

Explanation:



9. Which of the following shows the masses of the three elementary particles in decreasing order?A.Leptons, Baryons, MesonsB.Mesons, Baryons, LeptonsC.Baryons, Mesons, LeptonsD.Leptons, Mesons BaryonsAnswer & Explanation

Answer: Option C

Explanation:



10. What is the wavelength of visible spectrum?A.

8500 - 9800 angstrom

B.7800 - 8000 angstromC.3900 - 7600 angstromD.

1300 - 3000 angstrom

Answer & Explanation

Answer: Option C11. Which of the following has a least penetrating power?

A.

All have same penetrating power

B.Beta Particles

C.Alpha particlesD.

Gamma rays


Answer: Option C

Explanation:



12. The isotope of uranium capable of sustaining chain reaction isA.

U-235 B.U-245

C.U-239 D.U-238Answer & Explanation

Answer: Option A

Explanation:



13. The age of most ancient geological formations is estimated byA.

Ra - Si method

B.Potassium - argon methodC.C14 methodD.

Uranium - lead method


Answer: Option C

Explanation:



14. Who suggested that most of the mass of the atom is located in the nucleus?A Thompson B.Bohr

.C.Rutherford D.EinsteinAnswer & Explanation

Answer: Option C

Explanation:



15. The dark lines in the solar spectrum are due toA.

absorption of corresponding wavelengths by the outer layers of the sun

B.destructive interference between waves of certain definite wavelengthsC.absorption of corresponding wavelengths by the prism used in the photographD.

absence of corresponding wavelengths from the light emitted by the core of the sun


Answer: Option A16. In an atomic nucleus, neutrons and protons are held together by

A.

gravitational forces

B.exchange forcesC.coulombic forcesD.

magnetic forces


Answer: Option B

Explanation:



17. 'No two electrons in an atom can have the same set of four quantum numbers' isA.

Newton's law

B.Bohr's lawC.Aufbau principleD.

Pauli's exclusion principle


Answer: Option D

Explanation:



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 cationC.an anionD.

an atom


Answer: Option A

Explanation:



19. Atoms of an element differ from those of all other elements inA.

atomic number and electronic configuration

B.number of neutrons and number of valence electronsC.atomic number and number of valence electronsD.

number of neutrons and electronic configuration


Answer: Option A

Explanation:



20. Nuclear fission is caused by the impact of

A.

neutron B.proton

C.deuteron D.electronAnswer & Explanation

Answer: Option A21. Which of the following rays are more penetrating?

A.

Beta rays

B.Alpha raysC.Gamma raysD.

X-rays


Answer: Option C

Explanation:



22. How many colours the sunlight spectrum has?A.

Three B.Seven

C.Four D.FiveAnswer & Explanation

Answer: Option B

general knowledge general science nuclear science

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