MCQ TEST-1
TEST-1
1. What is conventional current?
2. A wire is carrying current is it charged? If yes then, why?
3. One coulomb of charge flows through any cross section of a conductor in 1 second. What is the current flowing through the conductor?
4. Which of the two is connected in series, ammeter or voltmeter?
5. What is the potential difference between the terminals of battery is 250 joules of work is required to transfer 20 coulombs of charge from one terminal of the battery to the other?
Ans.: MCQ TEST-1: 1.A, 2.A, 3.A, 4.D, 5.C, 6.A, 7.A, 8.C, 9.C, 10.A
TEST-1: 2. NO, 3. 1A, 4. Ammeter, 5. 12.5V
MCQ TEST-2
TEST-2
1. Does the value of resistance of a conductor depend upon the potential difference applied across it or the current passed through it?
2. A wire of resistivity r is stretched to double its length. What will be its new resistivity?
3. Two wires A and B of same metal have the same area of cross-section and have their lengths in the ratio 2: 1. What will be the ratio of currents flowing through them, when the same potential difference is applied across length of each of them?
4. Compare the resistance of two wires of same material. Their lengths are in the ratio 2: 3 and their diameters are in the ratio 1: 2.
5. If the current supplied to a variable resistor is constant, draw a graph between voltage and resistance.
6. Calculate the potential difference across each resistor in the circuit shown in figure below:
Ans.: MCQ TEST-2: 1.B, 2.D, 3.B, 4.D, 5.A, 6.D, 7.A, 8.C, 9.D, 10.C
TEST-2: 3. 1:2 4.8:3 6. 25/21V, 30/21V, 50/21V
MCQ TEST-3
TEST-3
1. An electric kettle is rated 500 W, 220 V. It is used to heat 400 g of water for 30 seconds. Assuming the voltage to be 220 V, calculate the rise in the temperature of the water. Specific heat capacity of water = 4200 J/kj0C.
2. Three identical are connected in parallel with a battery. The current drawn from the battery is 6 A. If one of the bulbs gets fused, what will be the total current drawn from the battery?
3. When two resistors are joined in series, the equivalent resistance is 90W . When the same resistors are joined in parallel, the equivalent resistance is 20 W . Calculate the resistances of the two resistors.
4. Name of few practical applications of heating effect of current.
5. Out of the following bulbs rated 40 W, 220 V, 60 W, 220 V and 100 W, 220 V which one will glow the brightest when connected in series in series to a supply of 220 V? ()
Ans.: MCQ TEST-3: 1.C, 2.D, 3.B, 4.B, 5.D, 6.B, 7.B, 8.C, 9.B, 10.C
TEST-3: 1. 8.90C 2. 4A 3. 60 and 30 ohm 5. 40W, 220V bulb will glow brightest
