In a series R-L-C circuit at resonance; the voltages across the resistor and the inductor are 30V and 40V respectively. What is the voltage across the capacitor?
A. 30V B. 70V C. 50V D. 40V Correct Answer: Option D – 40V
A lead bullet of mass 0.05 kg is fired with a velocity of 200 m/s into a lead block of mass 0.95 kg. Given that the lead block can move freely, the final kinetic energy after impact is
A. 100J A. 150J C. 50J D. 200J Correct Answer: Option C – 50J Explanation From the law of conservation of linear momentum m1u1+m2u2=m1v1+m2v2 Since the collision is inelastic, we have (0.05×200) − (0.95×0)=(0.05+0.95)V 10=V V=10ms−¹ Hence the Kinetic energy =...
One of the features of the fission process is that?
A. it leads to a chain reaction B. its products are not radioactive C. neutrons are not released D. of the masses of the reactants equals the sum of the masses of the products Correct Answer: Option A – its products are not...
The pitch of an acoustic device can be increased by?
A. decreasing the loudness B. increasing the intensity C. increasing the frequency D. decreasing the intensity Correct Answer: Option C – increasing the frequencyProducts
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