Physics 914 MCQs [All-Courses]

Physics is a core science subject that deals with the study of matter, energy, motion, force, heat, light, electricity, magnetism, and modern physics concepts. It plays a vital role in competitive exams such as PPSC, FPSC, NTS, OTS, KPPSC, BPSC, AJKPSC, CSS, and PMS, where questions test conceptual understanding, numerical problem-solving, and application of laws and formulas.

A cube of side 5 cm has a charge of 6 C. The surface density of charge is_________?

A 100 C m–2

B 200 C m–2

C 300 C m–2

D 400 C m–2

Review Detailed Answer

Correct Answer: 400 C m–2

In bringing an electron towards the second electron, the electrostatic potential energy of the system

A Decreases

B increases

C remains the same

D becomes zero

Review Detailed Answer

Correct Answer: increases

How many electrons per second constitute a current of one micro ampere?

A one electron

B 10 –6 electrons

C 106 electrons

D 6.25 × 1012 electrons

Review Detailed Answer

Correct Answer: 6.25 × 1012 electrons

A piece of copper and a piece of germanium are cooled from the room temperature down to 77 K.

A The resistance of each of them increases.

B The resistance of each of them decreases.

C The resistance of copper decreases and that of germanium increases.

D The resistance of copper increases and that of germanium decreases

Review Detailed Answer

Correct Answer: The resistance of copper decreases and that of germanium increases.

Two parallel beams of positrons moving in the same direction will________?

A repel each other

B not interact with each other

C attract each other

D be deflected normal to the plane containing the two beams.

Review Detailed Answer

Correct Answer: repel each other

An emf of 5 volt is produced by a self inductance, when the current changes at a steady rate from 3 to 2 ampere in 1 millisecond. The value of self inductance is_______?

A zero

B 5 H

C 5000 H

D 5 mH

Review Detailed Answer

Correct Answer: 5 mH

The core of a transformer is laminated to reduce energy losses due to__________?

A Eddy currents

B Hysteresis

C Resistance in winding

D None of these

Review Detailed Answer

Correct Answer: Eddy currents

Which of the following is true ?

A Lyman series is a continuous spectrum.

B Paschen series is a line spectrum in the infra red.

C Balmer series is a line spectrum in the ultraviolet.

D the spectral series formula can be derived from the Rutherford model of the hydrogen atom.

Review Detailed Answer

Correct Answer: Paschen series is a line spectrum in the infra red.

Electric current in a solid metal conductor is caused by the movement of what ?

A Protons

B Electrons

C Metal atoms

D Metal ions

Review Detailed Answer

Correct Answer: Electrons

A Stone thrown from the top of a tall building follows a path that is:

A Circular

B Made of two straight line segments

C Hyperbolic

D Parabolic

Review Detailed Answer

Correct Answer: Parabolic

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Physics 914 MCQs [All-Courses]

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All Topics 914

A cube of side 5 cm has a charge of 6 C. The surface density of charge is_________?

In bringing an electron towards the second electron, the electrostatic potential energy of the system

How many electrons per second constitute a current of one micro ampere?

A piece of copper and a piece of germanium are cooled from the room temperature down to 77 K.

Two parallel beams of positrons moving in the same direction will________?

An emf of 5 volt is produced by a self inductance, when the current changes at a steady rate from 3 to 2 ampere in 1 millisecond. The value of self inductance is_______?

The core of a transformer is laminated to reduce energy losses due to__________?

Which of the following is true ?

Electric current in a solid metal conductor is caused by the movement of what ?

A Stone thrown from the top of a tall building follows a path that is: