When an ambulance with a blaring siren moves towards an observer, the pitch of the siren appears to be higher. This is due to: MCQ with Answer and Explanation

Question
When an ambulance with a blaring siren moves towards an observer, the pitch of the siren appears to be higher. This is due to:
A. Acoustic resonance
B. The Doppler Effect
C. Reverberation
D. Interference of sound waves
Answer: Option B
Solution (By JKSSB Mock Tests)
The Doppler Effect is the apparent change in the frequency (and thus pitch) of a wave due to the relative motion between the source and the observer. As the ambulance approaches, sound waves get compressed, increasing the perceived frequency (higher pitch). As it moves away, waves stretch, lowering the frequency.
This question belongs to: Science Physics
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Question #1
Two parallel wires carrying direct currents in the opposite directions will:
A. Have no effect on each other
B. Repel each other
C. Attract each other
D. Rotate perpendicular to each other
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Correct Answer: Option B

Explanation:
According to Ampere's force law, parallel wires carrying currents in the SAME direction create magnetic fields that attract each other. Conversely, parallel wires carrying currents in OPPOSITE directions create magnetic fields that push against each other, causing the wires to repel. Exam tip: 'Same' Attracts, 'Opposite' Repels (reverse of charges!).
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Question #2
Which of the following is a renewable source of energy?
A. Petroleum
B. Solar energy
C. Nuclear fuel
D. Coal
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Correct Answer: Option B

Explanation:
Solar, wind, hydro, biomass renewable. Coal, oil, natural gas fossil fuels, non-renewable. Nuclear fuel uranium finite. Renewable replenish naturally.
This question belongs to: Science Physics
Question #3
The time period of a satellite in low Earth orbit is about
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Correct Answer: Option B

Explanation:
Low Earth orbit (LEO) satellites (altitude ~200-2000 km) have orbital period ~90 minutes. ISS orbits in ~93 min. Geostationary orbit period 24 h. Moon 27 days. Kepler's third law applies.
This question belongs to: Science Physics
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