The frequency of a wave is 1 kHz. Its time period is MCQ with Answer and Explanation
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Question #1
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A rocket works on the principle of conservation of
Correct Answer: Option C
Explanation:
Rocket propulsion: expelled gases backwards impart forward momentum to rocket. Total momentum of rocket + exhaust gases remains conserved. No external force, so momentum conservation applies. Jet engines also work on similar principle.
Rocket propulsion: expelled gases backwards impart forward momentum to rocket. Total momentum of rocket + exhaust gases remains conserved. No external force, so momentum conservation applies. Jet engines also work on similar principle.
Question #2
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Beats used for:
Correct Answer: Option C
Explanation:
Beats: tune instruments (zero beat = matched frequency); measure sound speed via known frequency difference. Memory tip: 'Beats: tuning and measurement applications'. Wave phenomenon application frequently tested in competitive exams.
Beats: tune instruments (zero beat = matched frequency); measure sound speed via known frequency difference. Memory tip: 'Beats: tuning and measurement applications'. Wave phenomenon application frequently tested in competitive exams.
Question #3
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Which scientific instrument is used specifically for measuring very high temperatures, such as the surface temperature of the Sun or inside a furnace, from a distance?
Correct Answer: Option A
Explanation:
A pyrometer is a non-contact thermometer used to measure high temperatures. It operates on the principle of thermal radiation (Stefan-Boltzmann law or Wien's law), measuring the intensity or spectrum of electromagnetic radiation emitted by the extremely hot object. A cryometer measures very low temperatures, and a calorimeter measures heat capacity.
A pyrometer is a non-contact thermometer used to measure high temperatures. It operates on the principle of thermal radiation (Stefan-Boltzmann law or Wien's law), measuring the intensity or spectrum of electromagnetic radiation emitted by the extremely hot object. A cryometer measures very low temperatures, and a calorimeter measures heat capacity.
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