physics

Which of the following is stored by dry Leclanche cell?

A. chemical energy B. nuclear energy C. solar energy D. heat energy E. electrical energy Correct Answer: Option A =…

5 years ago

If the frequency of the e.m.f. source in the a.c. circuit illustrated below is 500/π Hz. What is the reactance of the inductor?

A. 450 B. 0.9 C. 900 D. 567 E. 43 Correct Answer: Option C - 900 Explanation x = 2πfL=2π×500/π…

5 years ago

In which of the following is a stationary wave produced?

i. A vibrating tuning fork held near the end of a resonance tube closed at one end. ii. A string…

5 years ago

A man standing 300m away from the wall sounds a whistle. The echo from the wall reaches him 1.8sec. later. Calculate the velocity of sound in air?

A. 540.0ms−¹ B. 333.3ms−¹ C. 270.0ms−¹ D. 166.7ms−¹ E. 83.3ms−¹ Correct Answer: Option B - 333.3ms−¹ Explanation V = 2x/t=2×300/1.8…

5 years ago

Which of the following statements is true of the diagram shown below?

A. the two-point, A and B are in phase B. distance AB is half the wavelength of the wave C.…

5 years ago

The sound from a bell in an enclosed jar gradually faints away while the jar is being evacuated. Which of the following explains this observation?

A. the pressure is reduced B. the sound waves are pumped out C. the waves are absorbed in the inner…

5 years ago

What type of motion does the skin of a talking drum perform when its being struck with the drum stick?

A. random B. rational C. vibratory D. translational E. circular Correct Answer: Option C - vibratory

5 years ago

Which of the following statements about wave is not correct?

i. A wavefront is a line which contains all particles whose vibration are in phase. ii. The direction of propagation…

5 years ago