100% FREE ACCESS9th Standard Syllabus & Materials
9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -கற்கண்டு (இலக்கணம்) - தொடர் இலக்கணம், ஆகுபெயர் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -விரிவானம் (துணைப்பாடம்) - தாய்மைக்கு வறட்சி இல்லை! Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -கவிதை பேழை (செய்யுள்) - மார்கழி பெருவிழா Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உயிருக்கு வேர்-இலக்கணம் - பகுபத உறுப்பிலக்கணம் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil அமுதென்று பேர் - இலக்கணம்-எழுத்து -அளபெடை Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil அமுதென்று பேர்-துணைப்பாடம் - ஆறாம்திணை Important Questions And Answers Study Material - QB365 Set A
Published on: 09/12/2020
9th Standard Science Sound English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021
Download Tamil Nadu 9th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
The phenomenon of echo of sound waves is due to _____________.
Reflection
Interference
Diffraction
All of the above
2.
A small bee produces sound, while it moves, the sound is created due to _____________.
grinding its teeth
Friction due to air
flapping of wings
sound due to its vocal cord
3.
Which of the following sound is not the cause of noise pollution?
Loudspeaker
Horn of vehicle
Explosion
Television
4.
What name is given to the aircraft which fly at speeds greater than the speed of sound?
Ultrasonic jets
Infrasonic jets
Supersonic jets
Regular jets
5.
The velocities of sound waves in four media P, Q, R and S are 1800 km/h, 900 km/h, 0 km/h, and 1200 km/h respectively. Which could be a liquid medium?
R
Q
P
S
6.
The speeds of sound in four different media are given below. Which of the following is the most likely speed in ms-1 with which the two underwater whales in a sea can talk to each other when separated by a large distance?
5170
1280
340
1530
7.
The sound waves travel faster
in liquids
in gases
in solids
in vacuum
8.
The maximum speed of vibrations which produces audible sound will be in
seawater
ground glass
dry air
Human blood
9.
If the speed of a wave is 340 m s-1 and its frequency is 1700 Hz, then wavelength λ for this wave in cm will be
34
20
15
0.2
10.
Sound travels in air:
if there is no moisture in the atmosphere.
if particles of medium travel from one place to another.
if both particles as well as disturbance move from one place to another.
if disturbance moves.
1.
(a)
Reflection
2.
(c)
flapping of wings
3.
(d)
Television
4.
(c)
Supersonic jets
5.
(d)
S
6.
(d)
1530
7.
(c)
in solids
8.
(b)
ground glass
9.
(b)
20
10.
(d)
if disturbance moves.
9th Standard Syllabus & Materials
9th Standard
TN 9th Tamil உள்ளத்தின் சீர் - திருக்குறள் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் - மணிமேகலை Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் - ஏறு தழுவுதல் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உயிருக்கு வேர் - தண்ணீர் Important Questions And Answers Study Material - QB365 Set A
Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
