421JPSC2013General ScienceEnglish
The Doppler’s effect is applicable for
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Correct option: D — Both (A) and (B)
Free · past papers · answers included
General Science MCQ practice free online · page 43
Questions from RRB, NTPC, Group D and JE past papers. Tap an option to check it instantly — every question shows the correct answer, and most carry the explanation the paper gave.
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- 422UPPSC2007General ScienceEnglish
When T.V. is switched on
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Correct option: A — Audio and video both start simultaneously
- 423RPSC2012General ScienceEnglish
In television broadcast, the picture signals are transmitted by
Show answerAnswer & explanation
Correct option: A — Amplitude modulation
- 424TNPSC2019General ScienceEnglish
The technique used to transmit audio signals in television broadcast is
Show answerAnswer & explanation
Correct option: C — Frequency modulation
- 425Goa PSC2016General ScienceEnglish
A radio station broadcast at 30 metre band. The frequency of the carrier wave transmitted by this station is
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Correct option: C — 10 MHz
- 426OPSC2014General ScienceEnglish
Put in ascending order the speed of sound in the mediums. 1. Water 2. Steel 3. Nitrogen
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Correct option: B — 3, 1, 2
- 427Mizoram PSC2019General ScienceEnglish
Consider the following statements. 1. A flute of smaller length produces waves of lower frequency. 2. Sound travels in rocks in the form of longitudinal elastic waves only. Which of the statements given above is/are correct?
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Correct option: B — Only 2
- 428UPPSC2004General ScienceEnglish
Consider the following statements about ultrasonic waves. 1. They can destroy insects. 2. They can clean clothes by removing dust. 3. They can be used to treat diseases. 4. They can control automatic doors. Of the above statements.
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Correct option: D — All are correct
- 429UPPSC2002General ScienceEnglish
Consider the following statements. 1. The heart vibrates at infrasonic. 2. The speed of sound is more in gas than in liquid and solid. 3. Mach number is used to describe the speed of sound. 4. Ultrasonic sound has frequency more than 20,000 Hz. Of these statements.
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Correct option: C — 1, 3 and 4 are correct
- 430UPSC2007General ScienceEnglish
Assertion (A): A jet aircraft moving at mach number equal to 1 travels faster at an altitude of 15 km than while moving at mach number equal to 1 near the sea level. Reason (R): The velocity of sound depends on the temperature of the surrounding medium.
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Correct option: D — (A) is false, but (R) is true
General Science practice — common questions
Page 43 of this set has 10 questions on it.
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Yes. Every question on this page is free and needs no account. Create a free account only if you want your progress saved.
Where do these General Science MCQs come from?
They are taken from official past papers of Indian government recruitment exams such as RRB NTPC, RRB Group D and RRB JE, and each question keeps a reference to the exam it appeared in.
Are the questions available in Hindi?
Yes. Many papers are set in both languages, so a large share of these questions are available in Hindi. Use the language filter at the top of the page.
Do the questions show answers and explanations?
Every question shows the correct option. Where the source paper included a worked solution, the explanation is shown under "Show answer".