Physics Practice: Current Electricity (Mock Test 4 - Expert Logic)
1. Expert Analysis: A wire of resistance $10\text{ }\Omega$ is stretched to double its original length. Its new resistance will be:
2. When three identical resistors are connected in parallel, their equivalent resistance is $2\text{ }\Omega$. If they are connected in series, the equivalent resistance is:
3. The potential difference across a conductor is $V$. If $V$ is doubled and resistance is halved, the current $I$ becomes:
4. Which of the following graphs represents an Ohmic conductor at a constant temperature?
5. The e.m.f. of a cell is $2.0\text{ V}$. When it is connected to a $4\text{ }\Omega$ resistor, the terminal voltage is $1.6\text{ V}$. The internal resistance is:
6. A wire has resistance $R$. If its radius is doubled without changing its length, its new resistance is:
7. The resistance of a carbon filament ________ with an increase in its temperature.
8. In a series circuit with two resistors $R_1$ and $R_2$ ($R_1 > R_2$), the current $I$ is:
9. One kilowatt-hour ($\text{kWh}$) is equivalent to how many Joules?
10. The slope of $V$-$I$ graph for an ohmic conductor gives the value of its ________.
11. A fuse wire must have high ________ and low ________.
12. The e.m.f. of a cell depends on the ________.
13. Which of the following materials has a negative temperature coefficient of resistance?
14. When two equal resistors are connected in parallel, the total resistance is ________.
15. A current of $0.5\text{ A}$ flows through a $12\text{ V}$ lamp. The resistance of the lamp is:
16. The specific resistance of a wire is $\rho$. If its length is doubled, its specific resistance becomes:
17. In an electric circuit, an Ammeter is always connected in ________.
18. Potential Difference ($V$) = ________.
19. If the current through a resistor is doubled, the rate of heat production becomes ________ times.
20. The unit of electrical energy consumed by a household is ________.