Searching for "frequency"

Q:

An assertion and a reason are given below.

 

Assertion : When velocity is kept constant and wavelength is halved, then the frequency is doubled.

 

Reason : Velocity = Frequency x Wavelength

 

Choose the answer.

 

A) Both Assertion and Reason are true and Reason is the correct explanation of Assertion B) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
C) Both Assertion and Reason are false D) Assertion is true but Reason is false
 
Answer & Explanation Answer: A) Both Assertion and Reason are true and Reason is the correct explanation of Assertion

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Filed Under: Statement and Conclusions
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Q:

If the frequency of a sound wave of given velocity is increased , how will it affect its wavelength?

A) Its wavelength will increase B) The wavelength will not be affected
C) Its wave length will decrease D) Wavelength will keep increasing and decreasing alternately
 
Answer & Explanation Answer: C) Its wave length will decrease

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Q:

A broadcasting station transmits waves with a frequency of 71 x 104 Hz and a speed of 3 x 108 m/s. The wavelength of the wave is

A) 324.6 m B) 422.5 m
C) 208.4 m D) 418.8 m
 
Answer & Explanation Answer: B) 422.5 m

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Filed Under: Physics
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Q:

A sound of single frequency is called a

A) Hertz B) Tone
C) Pitch D) Note
 
Answer & Explanation Answer: B) Tone

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Q:

Which of the following coloured light has the lowest frequency?

A) Green B) Blue
C) Red D) Violet
 
Answer & Explanation Answer: C) Red

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Filed Under: Physics
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Q:

A sound wave has a frequency of 4 kHz and a wavelength of 40 cm. The time taken by the sound wave to travel a distance of 3.2 km is

A) 0.5 s B) 2.0 s
C) 4.0 s D) 1.0 s
 
Answer & Explanation Answer: B) 2.0 s

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Q:

Indian Space Research Organisation (ISRO) and Jet Propulsion Laboratory (JPL) of NASA are working on world’s most expensive earth-imaging satellite to use dual frequency. Its name is ______

A) Cartosat B) NISAR
C) APM D) NIJAR
 
Answer & Explanation Answer: B) NISAR

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Filed Under: General Science
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Q:

Calculate the frequency (in Hz) of a sound wave of wavelength 4m travelling with a speed of 200 m/s.

A) 50 B) 800
C) 100 D) 400
 
Answer & Explanation Answer: A) 50

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Filed Under: Physics
Exam Prep: Bank Exams , CAT