9th 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 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.
A Sonar device on a submarine send out a signal and receives an echo 5 seconds later. Calculate the speed of sound it water if the distance of the object from the submarine is 3500 m.
1440 ms-1
1460 ms-1
1400 ms-1
1550 ms-1
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.
The back and forth motion of the object is called ___________.
Vibration
Rotation
Translation
Linear motion
4.
Speed of sound in solids does not depend upon __________.
temperature
density
medium
pressure
5.
Which of the following are infrasonic waves?
5 kHz
25 Hz
10 Hz
15000 Hz
6.
When the pitch of note by a harmonium is lowered, then the wave length of the note
first decreases and then increases
decreases
remains the same
increases
7.
In the sound wave produced by a vibrating turning fork as shown in the diagram, half the wave length is represented by:
BD
AB
AE
DE
8.
Which of the following statement best describes frequency?
the number of complete vibrations per second.
the distance travelled by a wave per second.
the distance between one crest of wave and the next one.
the maximum disturbance caused by a wave.
9.
A musical instrument is producing continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through
wax
vacuum
water
empty vessel
10.
Which of the following vibrates when a musical note is produced by the cymbals in a orchestra?
stretched strings
stretched membranes
air columns
metal plates
1.
(c)
1400 ms-1
2.
(c)
flapping of wings
3.
(a)
Vibration
4.
(d)
pressure
5.
(c)
10 Hz
6.
(d)
increases
7.
(b)
AB
8.
(a)
the number of complete vibrations per second.
9.
(b)
vacuum
10.
(d)
metal plates
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
