Question Bank
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Which of the following describes the relationship for an ideal step-up transformer?
An electric kettle rated 1.5kW, 220V is used for 4 minutes to boil water. How much energy is consumed in Joules?
In a given circuit, if the voltage is tripled and resistance is doubled, the current will change by a factor of:
A galvanometer with a resistance of 100 Ohms gives full scale deflection for a current of 1mA. How much series resistance is needed to convert it into a voltmeter of range 0-10V?
What happens to the magnetic field at the center of a circular coil if its radius is doubled (keeping current and turns same)?
A solenoid of length 0.5m has 500 turns. If 2A current flows, calculate the magnetic field strength (take μ₀ = 4π x 10^-7 T m/A).
Which of the following will not change the direction of rotation of a DC motor?
What is the total energy consumed in Joules by a 100W bulb in 24 hours?
How many 60W bulbs can be safely used on a 220V circuit with a 5A fuse?
A wire is bent into a circle. What is the equivalent resistance across the diameter if the original wire had resistance R?
The input of a transformer is 220V AC and output is 12V. If it's a step-down transformer and has 1100 turns in primary, find secondary turns.
What is the peak voltage of a 220V AC supply? (Hint: V_peak = V_rms * √2)
The instrument used to measure electric current in a circuit is called a/an:
Which of the following materials is a good conductor of electricity?
According to Ohm's law, if the resistance is kept constant, current is directly proportional to:
The potential difference between two points in a circuit is measured in:
What is the standard frequency of Alternating Current (AC) supplied to households in Nepal?
Which safety device breaks the circuit when the current exceeds a safe limit?