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## Saturday 20 February 2021

### CBSE Class 9 Science - MCQ and Online Tests- Physics - Unit 5 - Sound

#### CBSE Class 9 Science – MCQ and Online Tests – Physics – Unit 5 – Sound

Every year CBSE  schools conducts Annual Assessment exams for 6,7,8,9,11th standards. These exams are very competitive to all the students. So our website provides online tests for all the 6,7,8,9,11th standard’s subjects. These tests are also very effective and useful for those who preparing for any competitive exams like Olympiad etc. It can boost their preparation level and confidence level by attempting these chapter wise online tests.

These online tests are based on latest CBSE syllabus. While attempting these our students can identify the weak lessons and continuously practice those lessons for attaining high marks. It also helps to revise the NCERT textbooks thoroughly.

#### CBSE Class 9 Science – MCQ and Online Tests – Physics – Unit 5 – Sound

Question 1.
In the curve half the wavelength is

(a) AB
(b) BD
(c) DE
(d) AE

Answer

Answer: (b) BD

Question 2.
In SONAR, we use
(a) ultrasonic waves
(b) infrasonic waves
(c) radio waves
(d) audible sound waves

Answer

Answer: (c) radio waves

Question 3.
Sound travels in air if
(?) particles of medium travel from one place to another
(b) there is no moisture in the atmosphere
(c) disturbance moves
(d) both particles as well as disturbance travel from one place to another.

Answer

Answer: (d) both particles as well as disturbance travel from one place to another.

Question 4.
When we change feeble sound to loud sound we increase its
(a) frequency
(b) amplitude
(c) velocity
(d) wavelength

Answer

Answer: (b) amplitude

Question 5.
Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting
(a) intensity of sound only
(b) amplitude of sound only
(c) frequency of the sitar string with the frequency of other musical instruments
(d) loudness of sound

Answer

Answer: (c) frequency of the sitar string with the frequency of other musical instruments

Question 6.
Earthquake produces which kind of sound before the main shock wave begins
(a) ultrasound
(b) infrasound
(c) audible sound
(d) none of the above

Answer

Answer: (a) ultrasound

Question 7.
Note is a sound
(a) of mixture of several frequencies
(b) of mixture of two frequencies only
(c) of a single frequency
(d) always unpleasant to listen

Answer

Answer: (c) of a single frequency

Question 8.
Infrasound can be heard by
(a) dog
(b) bat
(c) rhinoceros
(d) human beings

Answer

Answer: (c) rhinoceros

Question 9.
A key of a mechanical piano struck gently and then struck again but mush harder this time. In the second case
(a) sound will be louder but pitch will not be different
(b) sound will be louder and pitch will also be higher
(c) sound will be louder but pitch will be lower
(d) both loudness and pitch will remain unaffected

Answer

Answer: (a) sound will be louder but pitch will not be different

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