Electricity
Practice Electricity MCQs from Physics — Science.
What is the resistivity of a wire if its resistance is 10 Ohms, length is 2 m, and area is 0.5 m^2?
Two bulbs, 60W and 100W, are connected in series. Which one will glow brighter?
What happens to the magnetic field strength of a solenoid if the number of turns is increased?
A heater is rated 220V, 2200W. What is the current drawn by it?
If a circuit has a voltage of 12V and total resistance of 3 Ohms, find the current.
Which of these factors does NOT affect the induced EMF in a coil?
If two identical resistors are connected in series, the total resistance is R_s. If they are connected in parallel, the total resistance is R_p. What is R_s / R_p?
A wire of resistance 20 Ohms is cut into two equal halves. What is the resistance of each half?
What is the potential at a point in an electric field if 20 J of work is done in moving 5 C charge to that point?
Which of the following materials is most suitable for the core of a transformer?
How much heat is produced in a 5 Ohm resistor when 2 A current flows through it for 10 seconds?
A galvanometer can be converted into a voltmeter by connecting a ____ resistance in ____.
What happens if a voltmeter is mistakenly connected in series with a bulb?
Two resistors are in parallel. If one resistor is removed, what happens to the total resistance of the circuit?
A step-up transformer converts 10V to 100V. If the primary has 50 turns, how many turns does the secondary have?
What is the function of a split-ring commutator in a DC motor?
Which of these devices operates based on the principle of electromagnetic induction?
If a 5-unit electricity consumption costs 50 Rupees, what is the cost per kWh?
Calculate the equivalent resistance of the network where two 4-Ohm resistors are in parallel, and this combination is in series with a 2-Ohm resistor.