physics

A 120V; 60W lamp is to be operated on 220V A.C supply mains. Calculate the value of non-inductive resistance that would be required to ensure that the lamp is run on correct value?

A. 100Ω B. 200Ω C. 300Ω D. 500Ω Correct Answer: Option B = 200Ω Explanation Power of the lamp =…

4 years ago

Two long parallel wires X and Y carry currents 3A and 5A each. If the force experienced by unit length is 5 x 10^-5N. the force per unit length experienced by wire Y is

A. 3 x 10-5 B. 3 x 10-6 C. 5 x 10-5 D. 5 x 10-5 Correct Answer: Option D…

4 years ago

Lenz’s law is a law of conservation of?

A. electric charge B. electric current C. Energy D. Momentum Correct Answer: Option C = Energy Explanation Lenz's law of…

4 years ago

The instrument that measures both AC and DC is called?

A. A current balance B. a moving coil ammeter C. a moving iron ammeter D. an inverter Correct Answer: Option…

4 years ago

A 40KW electric cable was used to transmit electricity through a resistor of resistance 2.00Ω at 800V. The power loss as internal energy is

A. 4.0 x 10²W B. 5.0 x 10²W C. 4.0 x 10³W D. 5.0 x 10³W Correct Answer: Option D…

4 years ago

If two charged plates are maintained at a potential difference of 3kV; the work done in taking a charge of 600µc across the field is?

A. 0.8j B. 1.8j C. 9.0j D. 18.0j Correct Answer: Option B - 1.8j Explanation Workdone = product of the…

4 years ago

The difference observed in solids; liquids and gases can be accounted for by?

A. The different molecules in each of them B. The spaces and forces acting between the molecules C. Their melting…

4 years ago

Which of the following gas laws is equivalent to the work done?

A. Boyle's law B. Charles law C. Pressure law D. van der Waal's law Correct Answer: Option A - Boyle's…

4 years ago

A string of length 4m is extended by 0.02m when a load of 0.4kg is suspended at its end. What will be the length of the string when the applied force is 15N?

A. 4.05m B. 4.08m C. 5.05m D. 6.08m Correct Answer: Option B = 4.08m Explanation From hooke's law F=Ke F1/e1…

4 years ago

118.8cm² surface of the copper cathode of a voltameter is to be coated with 10^-6m thick copper of density 9 x 103kgm−³. How long will the process run with 10A constant current? [3.3 x 10^-7kgC‾¹]

A. 5.4 min B. 10.8 min C. 15.0 min D. 20.0 min Correct Answer: Option A - 5.4 min Explanation…

4 years ago
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