Modern Physics related objective short questions

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Modern Physics

🌿. occurring in the sun heat-origin fuel for nuclear reactions –
(A) Helium (b) carbon
(C), oxygen (d) hydrogen
Ans: (d)

🌿. The radiated energy of the sun is caused by:
(a) nuclear fission
(b) nuclear fusion
(c) heat transfer
(d) cosmic radiation
Ans: (d)

🌿. Which one of the following elements is essential in the manufacturing of a nuclear reactor?
(a) Cobalt (b) Plutonium
(c) Zirconium (d) Tungsten
Ans: (c)

🌿. Among the three types of radiation transmitted by radioactive components, which of the X-rays is equivalent but of shorter wavelength?
(a) Alpha radiation (b) Beta radiation
(c) Gamma radiation
(d) None of the three is correct
Ans: (c)

🌿. Energy is generated in a nuclear reactor:
(a) by controlled fusion
(b) by uncontrolled fission
(c) by controlled fission
(d) by uncontrolled fusion
Ans: (c)

🌿. Radio activity emits alpha, beta and gamma rays, which one has the highest penetrating power?
(a) Alpha (b) Gamma
(c) Beta (d) None of these
Ans: (b)

🌿. Nuclear energy is measured
in- (a) MeV (b) MW
(c) MJ (d) none of these
Ans: (a)

🌿. What type of waves are light, radio waves and X-rays?
(a) Electromagnetic (b) Nuclear
(c) Magnetic resonance (d) Seismic
Ans: (c)

🌿. The function of moderator in a nuclear reactor is-
(a) quenching the number of secondary neutrons
(b) slowing down the secondary neutrons
(c) increasing the number of fissile nuclei
(d) controlling fission reaction
Ans: (b)

🌿. The element that absorbs neutrons in a nuclear reactor is?
(a) Cadmium (b) Zinc
(c) Uranium (d) Lead
Ans: (a)

🌿. Which of the following electromagnetic waves has maximum frequency?
(a) X-rays (b) J-rays
(c) Ultraviolet rays
(d) Infrared rays
Ans: (d)

🌿. What are the majority charge carriers in p-type semiconductor?
(a) electrons (b) holes (
c) both electrons and holes
(d) none of these
Ans: (b)

🌿. Light waves are
(a) electric waves (b) magnetic waves
(c) electromagnetic waves
(d) electrostatic waves
Ans: (c)

🌿. Cathode rays are
(a) stream of electrons
(b) stream of positively charged particles
(c) stream of uncharged particles
(d) electromagnetic waves
Ans: (b)

🌿. The conductivity of a semiconductor at absolute zero is :
(a) zero (b) 1
(c) infinite (d) none of these
Ans: (c)

🌿. The Sun mainly gets energy from which process?
(a) Fission (b) Fusion
(c) Radiation (d) Explosion
Ans: (b)

🌿. The energy of the Sun is due to :
(a) fission of uranium
(b) fusion of helium
(c) fusion of hydrogen
(d) none of these
Ans: (c)

🌿. Which of the following are negatively charged radiation?
(a) D-rays (b) E-rays
(c) J-rays (d) X-rays
Ans: (b)

🌿. What is used in “Cryogenic Engine”?
(a) Boeing aircraft
(b) Rail engines (c) Space shuttle
(d) Nuclear test
Ans: (c)

🌿. The penetrating rays coming continuously from outer space, whose nucleus contains more nuclear energy, are called _______
(a) x-rays (b) r-rays
(c) -rays and -rays
(d) cosmic rays
Ans : (d)

🌿. Which of the following is used in solar cell?
(a) Cesium (b) Potassium
(c) Silicon (d) Teflon
Ans: (c)

🌿. In p-type semiconductors, electric current flows mainly due to _____:
(a) electrons (b) holes
(c) both electrons and holes
(d) neither electrons nor holes
Ans: (b)

🌿. Which of the following is a pure form of semiconductor?
(a) intrinsic (b) extrinsic
(c) intrinsic and extrinsic
(d) none of these
Ans: (a)

🌿. The cutting edge of form tools is greater than _______.
(a) Special Turning Tool
(b) Ordinary Turning Tool
(c) Facing Tool (d) Turning Tool
Ans: (a)


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