Physics MCQs GK objective Questions GK test Set – 70

Question 1.

In a magnetic field, the direction of motion of a current carrying conductor is given by

A. Maxwell’s right hand rule
B. Lenz’s rule
C. Flemings left hand rule
D. Kirchoff’s law

Ans: C. Flemings left hand rule

Question 2.

At the center of the sun, fusion converts hydrogen into

A. Helium
B. Plutonium
C. Water
D. Carbon

Ans: A. Helium

Question 3.

Choose the most appropriate answer: Natural radioactivity was discovered by

A. Marie Curie
B. Earnest Rutherford
C. Henry Bacquerel
D. Enrico Fermi

Ans: C. Henry Bacquerel

Question 4.

Radioactive elements can be traced out in living cell through a technique called

A. Centrifugation
B. Chromatography
C. Auto radiography
D. All the above

Ans: C. Auto radiography

Question 5.

The force between charged particles is called as:

A. Nuclear Force
B. Gravitational Force
C. Centrifugal Force
D. Electromagnetic Force

Ans: D. Electromagnetic Force

Question 6.

Gamma rays have greatest similarity with

A. A-rays
B. B-rays
C. X-rays
D. U.V.-rays

Ans: C. X-rays

Question 7.

In a nuclear reactor, one of the following is used as a fuel.

A. Coal
B. Uranium
C. Radium
D. Diesel

Ans: B. Uranium

Question 8.

The radiant energy having lowest energy is

A. Gamma rays
B. UV rays
C. Visible light
D. Microwave radiation

Ans: D. Microwave radiation

Question 9.

Moving electric charge produces :

A. Magnetic field
B. Sound waves
C. Light rays
D. Heat waves

Ans: A. Magnetic field

Question 10.

Heavy water is used in nuclear reactor to

A. Slow down neutron
B. Absorb neutron
C. Increase temperature
D. Increase speed of neutron

Ans: A. Slow down neutron

Question 11.

Alpha particle is the nucleus of an atom of

A. Lithium
B. Hydrogen
C. Helium
D. Oxygen

Ans: C. Helium

Question 12.

The mercury and sodium street lamps light up because of :

A. Atomic emission
B. Atomic absorption
C. Electron emission
D. Electron absorption

Ans: A. Atomic emission

Question 13.

Nuclear sizes are expressed in a unit named

A. Fermi
B. Angstrom
C. Newton
D. Tesla

Ans: A. Fermi

Question 14.

Radiocarbon is produced in the atmosphere as a result of

A. Collision between fast neutrons and nitrogen nuclei present in the atmosphere
B. Action of ultraviolet light from the sun on atmospheric oxygen
C. Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
D. Lightning discharge in atmosphere

Ans: A. Collision between fast neutrons and nitrogen nuclei present in the atmosphere

Question 15.

Energy stored in the nucleus of an atom is called

A. Nuclear energy
B. Atomic energy
C. Potential energy
D. Kinetic energy

Ans: A. Nuclear energy

Question 16.

Nuclear Reactors are based on which of the following phenomenon?

A. Magnetic confinement of Plasma
B. Nuclear Fusion
C. Controlled Nuclear Fission
D. None of the above

Ans: C. Controlled Nuclear Fission

Question 17.

Beta rays emitted by a radioactive material are

A. The electrons orbiting around the nucleus
B. Charged particles emitted by nucleus
C. Neutral particles
D. Electromagnetic radiations

Ans: B. Charged particles emitted by nucleus

Question 18.

What are the particles emitted by radioactive element after 3 consecutive disintegration?

A. 2 alpha 1 beta
B. 1 alpha 1 beta
C. 2 beta 1 alpha
D. 2 beta 2 alpha

Ans: C. 2 beta 1 alpha

Question 19.

In nuclear reactor, heavy water is used as

A. Coolant
B. Fuel
C. Moderator
D. Atomic smasher

Ans: C. Moderator

Question 20.

Which type of radiation has the lowest penetrating ability?

A. Alpha
B. Beta
C. Gamma
D. All of the above

Ans: A. Alpha

Physics GK MCQs all set

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