1. The ratio of voltage and electric current in a closed circuit
- remains constant
- varies
- increases
- falls
2. The curve representing ohm’s law is
- sine function
- Linear
- A parabola
- a hyperbola
3. The resistance of a conductor having length l area of cross section a and resistivity ρ is given as:
- ρa/l
- ρl/a
- ρla
- l/ρa
4. The resistance of wire varies inversely as
- area of cross section
- length
- resistivity
- temperature
5. Which of the following quantities are same in all parts of a series circuit?
- voltage
- power
- current
- resistance
6.Which of the following statements is false in case of a series circuit?
- the voltage drop across each resister is same
- the current flowing through each resistor is the same
- applied voltage is equal to the sum of voltage drops across individual resistors
- resistors are additive
7. A resistance of 30 Ω is connected across 240v supply. If a resistance R Ω is connected in parallel with 30Ω resistor across the same supply, the current drawn becomes triple of original one. The unknown resistor R is
- 15Ω
- 10Ω
- 5Ω
- 30Ω
8. Three resistors, each of R ohms, are connected to form a triangle. The resistance between any two terminals will be:
- 2/3 R
- 3/2R
- R
- 3R
9. Which of the following is not correct?
- P=V/R^2
- P=VI
- I=√(P/R)
- V=√PR
10. A 100W bulb is connected in series with a room heater. If now 100W bulb is replaced by a 40w bulb, the heater output will :
- increase
- decrease
- Remain the same