page 10 | Physics-DDCET MCQ - Electrical Engineering Objective

Q101. A black body is perfect____________

Absorber of energy

Reflector of energy

Transmitter of energy

None of above

Q102. A brass rod has an original length of \(2\:m\) and a coefficient of linear expansion of \(0.000019\:^\circ C^{-1}\). If the temperature increases by \(100\:^\circ C\), what will be the change in length of the brass rod?

0.038 m

0.38 m

3.8 m

0.0038 m

Q103. Which of the following statements is true for transverse waves?

Information cannot be passed by a transverse wave.

The oscillations are parallel to the direction of wave propagation.

The oscillations are perpendicular to the direction of wave propagation.

None of the above

Q104. _________ is a property of a material that describes its ability to conduct heat.

Thermal Conductivity

Specific Heat

Emissivity

Heat Capacity

Q105. In Fahrenheit scale water freezes at______________.

\(40^\circ F\)

\(0^\circ F\)

\(32^\circ F\)

\(212^\circ F\)

Q106. A sound wave of velocity 345 m/s and wavelength 0.5 m. Find it's frequency.

690 Hz

690 kHz

650 Hz

650 kHz

Q107. Sabine's formula for reverberation of time is _________.
Where,
\(V\) is the volume of the room in cubic meters
\(A\) is the total absorption in the room in \(m^2\)-O.W.U.
\(RT\) is the reverberation time in seconds

\(RT=\frac{0.165 \times V}{A}\)

\(RT=\frac{1.65 \times V}{A}\)

\(RT=\frac{0.165 \times V}{A^2}\)

\(RT=\frac{0.165 \times V^2}{A}\)

Q108. The phenomenon called ‘mirage’ is possible due to ______ property of the light.

absorption

reflection

total internal reflection

refraction

Q109. Ultrasonic waves are ________ for humans.

permeable

inaudible

audible

visible

Q110. What is the unit of the coefficient of linear expansion?

\(^\circ F\)

\(^\circ C\)

\(N\)

\(1/^\circ C\)

MCQ

Physics (DDCET)