page 12 | Physics-DDCET MCQ - Electrical Engineering Objective

Q121. Formula for equivalent capacitance for capacitors joined in series.

\(\frac{1}{C}=C_1+\frac{1}{C_2}\)

\(\frac{1}{C}=\frac{1}{C_1}+\frac{1}{C_2}\)

\(\frac{1}{C}=\frac{1}{C_1}+C_2\)

\(C=C_1+C_2\)

Q122. The relationship between the angle of incidence and the angle of refraction in the refraction of light is described by ________.

Snell's Law

Sabine’s Law

LASER Law

Coulomb’s Law

Q123. A metal rod is \(64.522 \:cm\) long at \(16\:^\circ C\) and \(64.576 \:cm\) at \(94\:^\circ C\). What will be the coefficient of linear expansion of its material.?

\(1.07 \times 10^{-2}\:^\circ C^{-1}\)

\(1.07 \times 10^{-3}\:^\circ C^{-1}\)

\(1.07 \times 10^{-5}\:^\circ C^{-1}\)

\(1.07 \times 10^{-4}\:^\circ C^{-1}\)

Q124. Light rays passing through of a Lens are not deviated.

Focus

Optical center

Centre of curvature

Aperture

Q125. ________ is the number of oscillations or cycles of a wave that occur in a unit of time

Amplitude

Wavelength

Periodic time

Frequency

Q126. Heat energy produced by sun reaches to earth due to___________.

conduction

convection

radiation

none

Q127. All radiation incident on a black body get_________.

refracted

reflected

absorbed

none

Q128. What is the speed of light in a vacuum?

\(3 \times 10^8\:m/s\)

\(3 \times 10^6\:m/s\)

\(3 \times 10^{-8}\:m/s\)

\(3 \times 10^{10}\:m/s\)

Q129. Sound wave has frequency less than 20 Hz is called .

Audible sound

Infrasonic

Ultrasound

Supersonic

Q130. Unit of Specific heat ___________.

\(Cal/^\circ C\)

\(JK^{-1}\: kg^{-1}\)

\(^\circ C/Cal\)

\(J K kg \)

MCQ

Physics (DDCET)