01. Ohm's Law, Resistance, Conductivity and Thermal Dependency of Resistance
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Current Electricity

151979 The resistance of the coil of an ammeter is $R$. The shunt required to increase its range $\mathrm{N}$-fold should have resistance

1 $\frac{\mathrm{R}}{(\mathrm{N}-1)}$
2 $\frac{\mathrm{R}}{\mathrm{N}}$
3 $\frac{\mathrm{R}}{(\mathrm{N}+1)}$
4 NR
SCRA-2015
Current Electricity

151980 A resistor is in the shape of a truncated right circular cone as shown in the figure. The end radii are a and $b$, and the length is $L$. The specific resistance of the material is $\rho$. What is the resistance of the object? [Assume that the taper is small so that the current density is uniform across any cross-section]

1 $\frac{\rho L}{a b}$
2 $\frac{\rho L}{\pi \mathrm{ab}}$
3 $\frac{\rho L}{\pi\left(b^{2}-a^{2}\right)}$
4 $\frac{\rho L}{\pi\left(b^{2}-a^{2}\right)}$
SCRA-2014
Current Electricity

151982 A copper rod of length $20 \mathrm{~cm}$ and crosssectional area $2 \mathrm{~mm}^{2}$ is joined with a similar aluminum rod in series. What a similar aluminum rod in series. What is the total resistance of the combination between the ends? (Resistivity of copper is $1.7 \times 10^{-6} \Omega \mathrm{cm}$ and that of aluminum is $2.6 \times 10^{-6} \Omega \mathrm{cm}$ )

1 $4.3 \times 10^{-3} \Omega$
2 $3.3 \times 10^{-3} \Omega$
3 $2.1 \times 10^{-3} \Omega$
4 $1.3 \times 10^{-3} \Omega$
SCRA-2013
Current Electricity

151983
In the figure given above three similar lamps $A ; B$ and $C$ are connected to a source. If the lamp $C$ fuses, how will the light emitted by $A$ and $B$ change?

1 No change
2 Brilliance of $\mathrm{A}$ decreases and that of $\mathrm{B}$ increases.
3 Brilliance of both A and B increase.
4 Brilliance of both A and B decrease.
SCRA-2012
Current Electricity

151984
What is the equivalent resistance between $A$ and $B$ in the above circuit?

1 $15 \Omega$
2 $19.2 \Omega$
3 Depends upon whether diode is forward biased or reverse biased
4 Cannot be determined because of insufficient data
SCRA-2010
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Current Electricity

151979 The resistance of the coil of an ammeter is $R$. The shunt required to increase its range $\mathrm{N}$-fold should have resistance

1 $\frac{\mathrm{R}}{(\mathrm{N}-1)}$
2 $\frac{\mathrm{R}}{\mathrm{N}}$
3 $\frac{\mathrm{R}}{(\mathrm{N}+1)}$
4 NR
SCRA-2015
Current Electricity

151980 A resistor is in the shape of a truncated right circular cone as shown in the figure. The end radii are a and $b$, and the length is $L$. The specific resistance of the material is $\rho$. What is the resistance of the object? [Assume that the taper is small so that the current density is uniform across any cross-section]

1 $\frac{\rho L}{a b}$
2 $\frac{\rho L}{\pi \mathrm{ab}}$
3 $\frac{\rho L}{\pi\left(b^{2}-a^{2}\right)}$
4 $\frac{\rho L}{\pi\left(b^{2}-a^{2}\right)}$
SCRA-2014
Current Electricity

151982 A copper rod of length $20 \mathrm{~cm}$ and crosssectional area $2 \mathrm{~mm}^{2}$ is joined with a similar aluminum rod in series. What a similar aluminum rod in series. What is the total resistance of the combination between the ends? (Resistivity of copper is $1.7 \times 10^{-6} \Omega \mathrm{cm}$ and that of aluminum is $2.6 \times 10^{-6} \Omega \mathrm{cm}$ )

1 $4.3 \times 10^{-3} \Omega$
2 $3.3 \times 10^{-3} \Omega$
3 $2.1 \times 10^{-3} \Omega$
4 $1.3 \times 10^{-3} \Omega$
SCRA-2013
Current Electricity

151983
In the figure given above three similar lamps $A ; B$ and $C$ are connected to a source. If the lamp $C$ fuses, how will the light emitted by $A$ and $B$ change?

1 No change
2 Brilliance of $\mathrm{A}$ decreases and that of $\mathrm{B}$ increases.
3 Brilliance of both A and B increase.
4 Brilliance of both A and B decrease.
SCRA-2012
Current Electricity

151984
What is the equivalent resistance between $A$ and $B$ in the above circuit?

1 $15 \Omega$
2 $19.2 \Omega$
3 Depends upon whether diode is forward biased or reverse biased
4 Cannot be determined because of insufficient data
SCRA-2010
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Current Electricity

151979 The resistance of the coil of an ammeter is $R$. The shunt required to increase its range $\mathrm{N}$-fold should have resistance

1 $\frac{\mathrm{R}}{(\mathrm{N}-1)}$
2 $\frac{\mathrm{R}}{\mathrm{N}}$
3 $\frac{\mathrm{R}}{(\mathrm{N}+1)}$
4 NR
SCRA-2015
Current Electricity

151980 A resistor is in the shape of a truncated right circular cone as shown in the figure. The end radii are a and $b$, and the length is $L$. The specific resistance of the material is $\rho$. What is the resistance of the object? [Assume that the taper is small so that the current density is uniform across any cross-section]

1 $\frac{\rho L}{a b}$
2 $\frac{\rho L}{\pi \mathrm{ab}}$
3 $\frac{\rho L}{\pi\left(b^{2}-a^{2}\right)}$
4 $\frac{\rho L}{\pi\left(b^{2}-a^{2}\right)}$
SCRA-2014
Current Electricity

151982 A copper rod of length $20 \mathrm{~cm}$ and crosssectional area $2 \mathrm{~mm}^{2}$ is joined with a similar aluminum rod in series. What a similar aluminum rod in series. What is the total resistance of the combination between the ends? (Resistivity of copper is $1.7 \times 10^{-6} \Omega \mathrm{cm}$ and that of aluminum is $2.6 \times 10^{-6} \Omega \mathrm{cm}$ )

1 $4.3 \times 10^{-3} \Omega$
2 $3.3 \times 10^{-3} \Omega$
3 $2.1 \times 10^{-3} \Omega$
4 $1.3 \times 10^{-3} \Omega$
SCRA-2013
Current Electricity

151983
In the figure given above three similar lamps $A ; B$ and $C$ are connected to a source. If the lamp $C$ fuses, how will the light emitted by $A$ and $B$ change?

1 No change
2 Brilliance of $\mathrm{A}$ decreases and that of $\mathrm{B}$ increases.
3 Brilliance of both A and B increase.
4 Brilliance of both A and B decrease.
SCRA-2012
Current Electricity

151984
What is the equivalent resistance between $A$ and $B$ in the above circuit?

1 $15 \Omega$
2 $19.2 \Omega$
3 Depends upon whether diode is forward biased or reverse biased
4 Cannot be determined because of insufficient data
SCRA-2010
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Current Electricity

151979 The resistance of the coil of an ammeter is $R$. The shunt required to increase its range $\mathrm{N}$-fold should have resistance

1 $\frac{\mathrm{R}}{(\mathrm{N}-1)}$
2 $\frac{\mathrm{R}}{\mathrm{N}}$
3 $\frac{\mathrm{R}}{(\mathrm{N}+1)}$
4 NR
SCRA-2015
Current Electricity

151980 A resistor is in the shape of a truncated right circular cone as shown in the figure. The end radii are a and $b$, and the length is $L$. The specific resistance of the material is $\rho$. What is the resistance of the object? [Assume that the taper is small so that the current density is uniform across any cross-section]

1 $\frac{\rho L}{a b}$
2 $\frac{\rho L}{\pi \mathrm{ab}}$
3 $\frac{\rho L}{\pi\left(b^{2}-a^{2}\right)}$
4 $\frac{\rho L}{\pi\left(b^{2}-a^{2}\right)}$
SCRA-2014
Current Electricity

151982 A copper rod of length $20 \mathrm{~cm}$ and crosssectional area $2 \mathrm{~mm}^{2}$ is joined with a similar aluminum rod in series. What a similar aluminum rod in series. What is the total resistance of the combination between the ends? (Resistivity of copper is $1.7 \times 10^{-6} \Omega \mathrm{cm}$ and that of aluminum is $2.6 \times 10^{-6} \Omega \mathrm{cm}$ )

1 $4.3 \times 10^{-3} \Omega$
2 $3.3 \times 10^{-3} \Omega$
3 $2.1 \times 10^{-3} \Omega$
4 $1.3 \times 10^{-3} \Omega$
SCRA-2013
Current Electricity

151983
In the figure given above three similar lamps $A ; B$ and $C$ are connected to a source. If the lamp $C$ fuses, how will the light emitted by $A$ and $B$ change?

1 No change
2 Brilliance of $\mathrm{A}$ decreases and that of $\mathrm{B}$ increases.
3 Brilliance of both A and B increase.
4 Brilliance of both A and B decrease.
SCRA-2012
Current Electricity

151984
What is the equivalent resistance between $A$ and $B$ in the above circuit?

1 $15 \Omega$
2 $19.2 \Omega$
3 Depends upon whether diode is forward biased or reverse biased
4 Cannot be determined because of insufficient data
SCRA-2010
Join With Us for More Updates
Current Electricity

151979 The resistance of the coil of an ammeter is $R$. The shunt required to increase its range $\mathrm{N}$-fold should have resistance

1 $\frac{\mathrm{R}}{(\mathrm{N}-1)}$
2 $\frac{\mathrm{R}}{\mathrm{N}}$
3 $\frac{\mathrm{R}}{(\mathrm{N}+1)}$
4 NR
SCRA-2015
Current Electricity

151980 A resistor is in the shape of a truncated right circular cone as shown in the figure. The end radii are a and $b$, and the length is $L$. The specific resistance of the material is $\rho$. What is the resistance of the object? [Assume that the taper is small so that the current density is uniform across any cross-section]

1 $\frac{\rho L}{a b}$
2 $\frac{\rho L}{\pi \mathrm{ab}}$
3 $\frac{\rho L}{\pi\left(b^{2}-a^{2}\right)}$
4 $\frac{\rho L}{\pi\left(b^{2}-a^{2}\right)}$
SCRA-2014
Current Electricity

151982 A copper rod of length $20 \mathrm{~cm}$ and crosssectional area $2 \mathrm{~mm}^{2}$ is joined with a similar aluminum rod in series. What a similar aluminum rod in series. What is the total resistance of the combination between the ends? (Resistivity of copper is $1.7 \times 10^{-6} \Omega \mathrm{cm}$ and that of aluminum is $2.6 \times 10^{-6} \Omega \mathrm{cm}$ )

1 $4.3 \times 10^{-3} \Omega$
2 $3.3 \times 10^{-3} \Omega$
3 $2.1 \times 10^{-3} \Omega$
4 $1.3 \times 10^{-3} \Omega$
SCRA-2013
Current Electricity

151983
In the figure given above three similar lamps $A ; B$ and $C$ are connected to a source. If the lamp $C$ fuses, how will the light emitted by $A$ and $B$ change?

1 No change
2 Brilliance of $\mathrm{A}$ decreases and that of $\mathrm{B}$ increases.
3 Brilliance of both A and B increase.
4 Brilliance of both A and B decrease.
SCRA-2012
Current Electricity

151984
What is the equivalent resistance between $A$ and $B$ in the above circuit?

1 $15 \Omega$
2 $19.2 \Omega$
3 Depends upon whether diode is forward biased or reverse biased
4 Cannot be determined because of insufficient data
SCRA-2010