Physics MCQs: Most Important Questions for Exams

McqsTestz.com has uploaded a comprehensive collection of Physics MCQs covering a wide range of topics including mechanics, thermodynamics, electromagnetism, optics, modern physics, waves, fluids, and more. Perfect for students preparing for exams such as matriculation, intermediate, competitive tests, Lecturer and university-level assessments.

Physics MCQs

Acceptor and donor impurities donate______________?

A. n-carriers only

B. p-carriers only

C. p-carriers and n-carriers respectively

D. n-carriers and p-carriers respectively

The electronic circuits which implement the various logic operations are called_____________?

A. Logic gates

B. Boolean algebra

C. Amplifier gain

D. Logic functions

In forward bias the width of potential barrier_____________?

A. Increases

B. Decreases

C. Remains same

D. No effect

In a half-wave rectifier the r.m.s. value of the A.C. component of the wave is________________?

A. Equal to D.C. value

B. More than D.C. value

C. Less than D.C. value

D. Zero

To obtain a p-type semi-conductor Si Crystal must be doped with foreign atoms whose valency is_____________?

A. 2

B. 3

C. 4

D. 5

The working of transistor as amplifier is similar to________________?

A. Step up transformer

B. Step down transformer

C. Three diodes in common

D. Triode vacuum tube

An OP-AMP comparator is a circuit that compares the signal voltage on one of its inputs with a ______________?

A. Non-inverting voltage at output

B. Reference voltage on the other

C. Virtual input

D. Output

Which one of the following is not a donor impurity ?

A. antimony

B. phosphorus

C. aluminium

D. arsenic

Forward current through a semi conductor diode circuit is due to____________?

A. minority carriers

B. majority carriers

C. holes

D. electron

The value of resistivity for insulator is of the order of____________?

A. 105 ohm metre

B. 106 ohm metre

C. 107 ohm metre

D. 108 ohm metre

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