Q 1 – The hearing range of human ear is
(a) 20 Hz to 20,000 Hz
(b) less than 20 Hz
(c) more than 20,000 Hz
(d) 20 Hz to 25,000 Hz
Q 2 – The frequency of subsonic sound is
(a) more than 20 Hz
(b) 100 Hz
(c) less than 20 Hz
(d) more than 20,000 Hz
Q 3 – Cochlea is a part of
(a) hearing organ
(b) sound producing organ
(c) muscular organ
(d) air – Pollution
Q 4 – The sound in the audible range is called
(a) ultrasonic sound
(b) sonic sound
(c) subonic sound
(d) light sound
Q 5 – A pendulum oscillates 2 times in 400 seconds. Find its time period.
(a) 0.005 sec.
(b) 0.001 sec.
(c) 0.2 sec.
(d) 0.1 sec
Q6- The voice box is also called as
(a) stomach
(b) heart
(c) larynx
(d) mouth
Q7- Sound is a kind of
(a) work
(b) energy
(c) force
(d) pressure
Q8- 1 hertz is equal to
(a) 1 vibration per minute
(b) 10 vibrations per minute
(c) 60 vibrations per minute
(d) 600 vibrations per minute
Q 9 – The number of vibrations made by a vibrating body in one second is
(a) frequency
(b) noise
(c) loudness
(d) pitch
Q10- The velocity of sound at 20°C is approximately
(a) 3400 m/sec.
(b) 340 m/sec.
(c) 430 m/sec
(d) 304 m/sec.
Q 11-Vibration is also known as
(a) Vibratory motion
(b) Translatory motion
(c) Oscillatory motion
(d) None of these
Q12- Frequency is expressed in
(a) Kilometer
(b) Hertz
(c) gram
(d) Degree centigrade
Q13- The number of oscillations per second is called
(a) Amplitude of oscillation
(b) Pitch of oscillation
(c) Frequency of oscillation
(d) None of the above
Q14- Above _____ dB the sound becomes physically painful
(a) 60
(b) 40
(c) 120
(d) 80
Q15- An ultrasound equipment works at frequency
(a) Higher than 20,000 Hz
(b) Higher than 10,000 Hz
(c) Lower than 20,000 Hz
(d) Lower than 10,000 Hz
Q 16-Voice of which of the following is likely to have minimum frequency:
(a) baby girl
(b) baby boy
(c) a man
(d) a woman
Q17- Frequency of oscillations is:
(a) the number of oscillations per minute
(b) the number of oscillations per hour
(c) the number of oscillations per second
(d) none of these
Q18- Noise pollution causes:
(a) lack of sleep
(b) hypertension
(c) anxiety
(d) all of these
Q19- Number of vocal cords in human is:
(a) one
(b) two
(c) four
(d) none of these
Q20- Voice box has stretched string like parts, which vibrate to produce sound are called:
(a) larynx
(b) vocal cords
(c) nerves
(d) arteries
Q21- High frequency of sound vibrations will produce a:
(a) loud sound
(b) shreak
(c) meak sound
(d) low piched sound
Q22- human beings sound is produced by __________.
Q23- Sound of frequency lower than 20 Hz is called the __________.
Q24- The speed of sound is maximum in __________.
Q25- Sounds of frequencies higher than 20,000 Hz are called the __________ sound.
Q26- Above __________ the noise becomes physically painful
Q27- The hearing range of human ears is __________.
Q28- Vibration is a repeated __________ and __________ motion.
Q 29-The human voice box is called __________.
Q30-
| Column-A | Column-B |
| (a) Number of vibrations produced by a vibrating particle in one second | (i) 330 m / sec |
| (b) Pitch | (ii) frequency |
| (c) Flute | (iii) vibration |
| (d) To and fro motion of a vibrating body about its mean position | (iv) vibration air column |
| (e) Speed of sound in air | (v) frequency of vibration |
Q 31- – Fill in the Blanks:
i) Human beings sound is produced by __________.
ii) The __________ nerve is also present in the inner ear
iii) Above __________ the noise becomes physically painful.
iv) The hearing range of human ears is __________.
Q 32– What do you mean by oscillatory motion?
Q 33-A simple pendulum makes 20 oscillations in 40 seconds. What is the time period and frequency of its
oscillation?
Q34- What do you mean by time period?
Q35- What do you mean by audible sound?
Q36- What is noise pollution?
Q 37-What is the property of vibration which determines the pitch of the sound?
Q 39 – A string musical instrument was first plucked with a force of smaller magnitude and then with a force of greater magnitude. In which case would the instrument produce a louder sound?
Q 40 – State the differences between ultrasonic sound and infrasonic sound?
Q 41 – What are the methods to control noise pollution?
Q 42 – Differentiate between musical sound and noise. (3 Marks)
Q 43 – How is sound produced and how is it transmitted and heard by us?