Physics MCQs

Correct answer D. Constructive and destructive interference

Correct answer A. Beats

Correct answer C. 2000 to 4000 Hz

Correct answer A. It decreases

Correct answer C. 0.61 m s⁻¹

Correct answer D. They need a material medium to propagate

Correct answer B. It increases

Correct answer D. Remains unchanged

Correct answer D. Mechanical waves

Correct answer C. Doppler effect

Correct answer D. Both A and C

Correct answer B. Four times

Correct answer A. 281 m/s

Correct answer D. An apparent decrease in frequency

Correct answer D. Destructive interference

Correct answer A. It equals the difference of their frequencies

Correct answer C. Frequency greater than 20 kHz

Correct answer B. Copper

Correct answer C. Zero

Correct answer B. Isothermal