401UPPSC2002General ScienceEnglish
Two astronauts cannot hear each other on the Moon’s surface, because
Show answerAnswer & explanation
Correct option: B — No atmosphere on the Moon
Free · past papers · answers included
General Science MCQ practice free online · page 41
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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- 402UPPSC2013General ScienceEnglish
An astronaut cannot hear his companion at the surface of the Moon because
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Correct option: C — There is no medium for sound propagation
- 403UPSC2017General ScienceEnglish
What is the purpose of ‘evolved Laser Interferometer Space Antenna (eLISA)’ project?
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Correct option: B — To detect gravitational waves
- 404UPPSC2012General ScienceEnglish
Ultrasonics are sound waves of frequency
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Correct option: A — Greater than 20,000 Hz
- 405RPSC2012General ScienceEnglish
A biotechnique in which ultrasonic sound is used
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Correct option: A — Sonography
- 406UPPSC2005General ScienceEnglish
Bats can fly during dark nights and also prey. This is because
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Correct option: D — They produce ultrasonic waves and are guided by them
- 407MPPSC1993General ScienceEnglish
Which one of the following is the effect of the flight of supersonic jet?
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Correct option: C — Depletion in ozone layer
- 408MPPSC2005General ScienceEnglish
Decibel is used to measure
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Correct option: C — Sound in atmosphere
- 409UPPSC2011General ScienceEnglish
Decibel unit is used to measure
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Correct option: B — Sound intensity
- 410RPSC2003General ScienceEnglish
What is the decibel level of sound produced by two persons in conversation?
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Correct option: C — About 30 decibel
General Science practice — common questions
Page 41 of this set has 10 questions on it.
Are these General Science questions free to practise?
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".