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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
Identify the incorrect statement
a) Compressions occur where particles are densely packed
b) The peak of the density-distance graph represents compressions
c) Rarefactions occur where particles are widely spaced
d) Valleys are shown as straight lines on the graph
Option d – Valleys are shown as straight lines on the graph
Bats are able to hunt during the night because
a) they have excellent vision
b) they can detect scents from prey
c) their ultrasonic sounds bounce off objects or prey, returning to their ears and helping them locate them
d) All of the above
Option c – their ultrasonic sounds bounce off objects or prey, returning to their ears and helping them locate them
Choose the statement that doesn’t fit
a) The SI unit for frequency is hertz (Hz)
b) Frequency is equal to the reciprocal of the time period
c) Sounds with different frequencies have the same pitch
d) The higher the frequency, the higher the pitch
Option c – Sounds with different frequencies have the same pitch
Objects with varying sizes and physical conditions vibrate at different
a) frequencies, resulting in different pitches
b) frequencies, but the pitch remains the same
c) time durations
d) energy levels
Option a – frequencies, resulting in different pitches
Making a weak sound louder involves increasing its
a) frequency
b) amplitude
c) speed
d) wavelength
Option b – amplitude
Before the main tremor of an Earthquake is felt, the sound generated is usually
a) ultrasonic
b) infrasound
c) within the audible range
d) None of these
Option b – infrasound
Soft and loud sounds can share the same
a) amplitude
b) frequency
c) wavelength
d) None of these
Option b – frequency
A massive explosion on the moon wouldn’t be heard on Earth because
a) It produces sound waves that are too high-pitched to hear
b) sound needs a medium to travel through, and space lacks one
c) The moon’s Atmosphere absorbs the sound
d) The Earth’s Atmosphere blocks the sound
Option b – sound needs a medium to travel through, and space lacks one
When an object vibrates forward, it compresses the air ahead, forming a high-pressure region known as
a) rarefaction
b) compression
c) depression
d) hypertension
Option b – compression
A person’s voice is recognized by its
a) pitch
b) tone quality
c) loudness
d) speed of sound
Option b – tone quality
When a vibrating object moves backward, it generates a low-pressure area called
a) rarefaction
b) compression
c) depression
d) hypertension
Option a – rarefaction
Pressure in regions of compression or rarefaction depends on
a) the number of particles in a specific volume
b) the density of particles in the medium
c) the particle positions
d) both (a) and (b)
Option d – both (a) and (b)
A compression is defined as an area of
a) low pressure
b) normal pressure
c) high pressure
d) no pressure
Option c – high pressure
Ultrasonic sound waves have frequencies
a) below 20 Hz
b) between 20 Hz and 20,000 Hz
c) above 20,000 Hz
d) above 20,000 MHz
Option c – above 20,000 Hz
The unit “hertz” refers to
a) one vibration per second
b) one second
c) one meter per second
d) one second per meter
Option a – one vibration per second
When a particle in contact with a vibrating object is displaced, it pushes the next particle. After that, the original particle
a) returns to its starting position
b) moves to disturb another particle
c) travels across the medium
d) None of these
Option a – returns to its starting position
At an outdoor concert, if someone’s head blocks your view, you can still hear the music because
a) sound travels through the head
b) the head’s size is small compared to the wavelength of the sound
c) the sound reflects off the head
d) sound’s wavelength is smaller than the head’s size
Option b – the head’s size is small compared to the wavelength of the sound
In a long spring, you can generate which type(s) of waves?
a) only longitudinal waves
b) only transverse waves
c) both longitudinal and transverse waves
d) only electromagnetic waves
Option c – both longitudinal and transverse waves
We covered all the Heat and Mass transfer mcq above in this post for free so that you can practice well for the exam.
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