Heat and Mass Transfer MCQ. We covered all the Heat and Mass Transfer MCQ in this post for free so that you can practice well for the exam.
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MCQ on Heat and Mass Transfer for Students
Select the irrelevant statement
(a) Compressions are the regions where particles are crowded together
(b) Compressions are represented by the upper portion. of the curve in the density-distance graph
(c) Rarefactions are where particles are spread apart
(d) Valleys are represented by the straight line
Option d – Valleys are represented by the straight line
Bats can hunt at night
(a) their eyesight is good
(b) they can smell their prey
(c) the high-pitched ultrasonic squeaks of the pat are reflected from the obstacles or prey and returned to the bat’s ear and thus the bat is able to detect.
(d) All of the above
Option c – the high-pitched ultrasonic squeaks of the pat are reflected from the obstacles or prey and returned to the bat’s ear and thus the bat is able to detect
Select the odd one out
(a) S.I. Unit is hertz (Hz)
(b) Frequency=1/Time Period
(c) Objects vibrating at different frequencies produce the same pitch
(d) Higher the frequency, the higher the pitch
Option c – Objects vibrating at different frequencies produce the same pitch
Objects of different sizes and conditions vibrate at different
(a) Frequencies to produce sounds of different pitches
(b) Frequencies to produce sounds of the same pitch
(c) Time intervals
(d) Energy levels
Option a – Frequencies to produce sounds of different pitches
When we change feeble sound to loud sound we increase its
(a) frequency
(b) amplitude
(c) velocity
(d) wavelength
Option b – amplitude
An earthquake produces which kind of sound before the main shock wave begins
(a) ultrasound
(b) infrasound
(c) audible sound
(d) None of the above
Option b – infrasound
Loud and soft sounds can have the same
(a) amplitude
(b) frequency
(c) wavelength
(d) None of these
Option b – frequency
A big explosion on the moon cannot be heard on earth because
(a) The explosion produces high-frequency sound waves which are inaudible
(b) Sound waves required a material medium for propagation
(c) Sound waves are absorbed in the moon’s atmosphere
(d) Sound waves are absorbed in the earth’s atmosphere
Option b – Sound waves required a material medium for propagation
When a vibrating object moves forward, it pushes and compresses the air in front of it creating a region of high pressure called
(a) rarefaction
(b) compression
(c) depression
(d) hypertension
Option b – compression
The voice of a friend is recognized by its
(a) pitch
(b) quality
(c) intensity
(d) velocity
Option b – quality
When the vibrating object moves backward, it creates a region of low pressure called
(a) rarefaction
(b) compression
(c) depression
(d) hypertension
Option a – rarefaction
(a) the Number of particles in the medium in a given volume
(b) the Density of particles in the medium
(c) the Position of the particles
(d) Both (a) and (b)
Option d – Both (a) and (b)
Compression is a region of
(a) low pressure
(b) normal pressure
(c) high pressure
(d) no pressure
Option c – high pressure
Ultrasonic waves have a frequency
(a) below 20 Hz
(b) between 20 and 20,000 Hz
(c) only above 20,000 Hz
(d) only above 20,000 MHz
Option c – only above 20,000 Hz
One hertz is equivalent to
(a) one cycle per second
(b) one second
(c) one meter per second
(d) one second per meter
Option a – one cycle per second
A particle of the medium in contact with the vibrating object is first displaced from its equilibrium position. It exerts a force on the adjacent particle and displaces it from rest. After displacing the adjacent particle the first particle
(a) Comes back to its original position
(b) Goes and displaces the other particle
(c) Travels till the end of the medium
(d) None of these
Option a – Comes back to its original position
If you are at an open-air concert and someone’s head gets between you and the orchestra, you can still hear the orchestra because
(a) sound waves pass easily through a head
(b) a head is not very large compared with the wavelength of the sound
(c) the sound is reflected from the head
(d) the wavelength of the sound is much smaller than the head
Option b – a head is not very large compared with the wavelength of the sound
In a long spring which of the following type of waves can be generated
(a) longitudinal only
(b) transverse only
(c) both longitudinal and transverse
(d) electromagnetic only
Option c – both longitudinal and transverse
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