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Physics Questions

Question 701:

The heat produced in a conductor carrying an electric current is

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A Inversely proportional to the current and the resistance
B Directly proportional to the current, resistance and the time
C Inversely proportional to of the resistance, current and the time
D Directly proportional to the square of the current, the resistance and the time

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Question 702:

The maximum permissible current through a galvanometer G of internal resistance 10\(\Omega\) is 0.05A. A resistance R is used to convert G into a voltmeter with a maximum reading of 100V. Find the value of R and how it is connected to G

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A 20,000 ohms in parallel
B 19,990 ohms in series
C 1990 ohms in series
D 100 ohms in series

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Question 703:

In alternating current theory, the units of impedance, r.m.s. voltage and resonance frequency are respectively equal to

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A Volt, ampere and hertz
B Ohms, volt and hertz
C Watt, ohms and radian
D Ohms, hertz and joule

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Question 704:

In A.C circuit theory, the root means square (r.m.s) current, I_rms and the peak (maximum)current I_o are related by

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A I_o = \(\frac{I_rms}{\sqrt{2}}\)
B I_rms = \(\frac{I_o}{\sqrt{2}}\)
C I_rms = \(\frac{\frac{I}{I_o}}{\sqrt2}\)
D I_rms = \(\frac{I_rms}{\sqrt{2}}\)

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Question 705:

The threshold of frequency for photoelectric effect depends on the

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A Intensity of incident light
B Frquency of incident light
C Material of the photocathode
D Potential difference between the cathode and the anode

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