Chapter 23: Sound Waves - Science Mcqs for Grade 7 - Set 4

1)   One example of string instrument is

a. piano
b. drum
c. saxophone
d. trombone
Answer  Explanation 

ANSWER: piano

Explanation:
No explanation is available for this question!


2)   The speed of sound in glass is

a. 2000 m/s
b. 6000 m/s
c. 10000 m/s
d. 14000 m/s
Answer  Explanation 

ANSWER: 6000 m/s

Explanation:
No explanation is available for this question!


3)   The microphone changes the sound waves into

a. mechanical signals
b. electrical signals
c. light signals
d. wave signals
Answer  Explanation 

ANSWER: electrical signals

Explanation:
No explanation is available for this question!


4)   Sounds are chiefly produced by

a. friction
b. energy
c. vibration
d. disturbance
Answer  Explanation 

ANSWER: vibration

Explanation:
No explanation is available for this question!


5)   The distance between two points of a wave in a phase is known as

a. wave front
b. frequency
c. amplitude
d. wavelength
Answer  Explanation 

ANSWER: wavelength

Explanation:
No explanation is available for this question!


6)   The term "vibration" has been derived from Latin word

a. loqui
b. vibrationem
c. silentium
d. biennium
Answer  Explanation 

ANSWER: vibrationem

Explanation:
No explanation is available for this question!


7)   Repetition of sound in empty hall is known as

a. echo
b. harsh echo
c. hollow echo
d. soft echo
Answer  Explanation 

ANSWER: echo

Explanation:
No explanation is available for this question!


8)   String instruments produce sound when

a. string is pushed
b. string is pulled
c. string is banged
d. string lift up
Answer  Explanation 

ANSWER: string is pushed

Explanation:
No explanation is available for this question!


9)   The sequence of notes is known as

a. plain
b. scale
c. balance
d. proportion
Answer  Explanation 

ANSWER: scale

Explanation:
No explanation is available for this question!


10)   Long exposure to sounds is dangerous for

a. ears
b. brain
c. nerves
d. eyes
Answer  Explanation 

ANSWER: ears

Explanation:
No explanation is available for this question!


11)   Tiny lumps of solid matter grew in kidney are known as

a. kidney larva
b. kidney stone
c. kidney salts
d. urea stone
Answer  Explanation 

ANSWER: kidney stone

Explanation:
No explanation is available for this question!


12)   A device for viewing oscillations by a display on the screen of a cathode ray tube is called

a. telescope
b. microscope
c. oscilloscope
d. stethoscope
Answer  Explanation 

ANSWER: oscilloscope

Explanation:
No explanation is available for this question!


13)   Sound is carried to our ears through

a. pressure
b. vibrations
c. temperature effect
d. humidity effect
Answer  Explanation 

ANSWER: vibrations

Explanation:
No explanation is available for this question!


14)   Light travels

a. slow than sound
b. fast than sound
c. at the same speed as of sound
d. at different speed as of sound
Answer  Explanation 

ANSWER: fast than sound

Explanation:
No explanation is available for this question!


15)   One of the three things that affects the sound produced by vibration of string is

a. weight of string
b. length of string
c. distance between two strings
d. material of string
Answer  Explanation 

ANSWER: length of string

Explanation:
No explanation is available for this question!


16)   Sound travels more fast in

a. air
b. liquids
c. solids
d. all of above
Answer  Explanation 

ANSWER: all of above

Explanation:
No explanation is available for this question!


17)   Sound cannot travel in vacuum because

a. there is no pressure in vacuum
b. there is no air in vacuum
c. there is no humidity in vacuum
d. there are no particle in vacuum
Answer  Explanation 

ANSWER: there are no particle in vacuum

Explanation:
No explanation is available for this question!


18)   Sound created by musical instruments is amplified by

a. increasing string vibration
b. decreasing string vibration
c. wooden sound box
d. metallic sound box
Answer  Explanation 

ANSWER: wooden sound box

Explanation:
No explanation is available for this question!


19)   The length of air cutting is changed by

a. valves
b. fingers
c. valves and fingers
d. hands
Answer  Explanation 

ANSWER: valves and fingers

Explanation:
No explanation is available for this question!


20)   An example of stringed instruments is

a. guitar
b. saxophone
c. drum
d. flute
Answer  Explanation 

ANSWER: guitar

Explanation:
No explanation is available for this question!