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Physics 914 MCQs [All-Courses]

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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. 

All Topics  914

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
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
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
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
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.
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
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
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.
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
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
Correct Answer: Parabolic
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