Science>Physics>Electric Current and Circuit>Resistance and Conductance

EASY

Earn 100

Define resistivity.

Important Questions on Electric Current and Circuit

EASY

Science>Physics>Electric Current and Circuit>Resistance and Conductance

Electrical resistivity of a given metallic wire depends upon

EASY

Science>Physics>Electric Current and Circuit>Resistance and Conductance

Define the resistivity of a substance.

MEDIUM

Science>Physics>Electric Current and Circuit>Resistance and Conductance

Resistance of a metal wire of length

1 m

is

26 Ω

at

20 ° C

. If the diameter of the wire is

0.3 mm

, What will be the resistivity of the metal at that temperature?

MEDIUM

Science>Physics>Electric Current and Circuit>Resistance and Conductance

Write the S.I. unit of resistivity. An electric motor takes $5 A$ from a $220 V$ source. Determine the power of the motor and energy consumed in $2$ hours.

MEDIUM

Science>Physics>Electric Current and Circuit>Resistance and Conductance

Let

C_{NaCl}

and

{C_{BaSO}}_{4}

, be the conductances (in S) measured for saturated aqueous solutions of

NaCl

and

B a S O_{4}

respectively, at a temperature T. Which of the following is false?

EASY

Science>Physics>Electric Current and Circuit>Resistance and Conductance

A wire of resistance

1000 Ω

and length

l

is increased to twice its original length. Calculate its new resistance.

EASY

Science>Physics>Electric Current and Circuit>Resistance and Conductance

Name the factors affecting the resistance of a conductor.

EASY

Science>Physics>Electric Current and Circuit>Resistance and Conductance

What are the factors on which the resistance of a conductor depends?

EASY

Science>Physics>Electric Current and Circuit>Resistance and Conductance

If the conductivity of mercury at

0 ° C

is

1.07 \times 10^{6} S m^{- 1}

and the resistance of a cell containing mercury is

0.243 Ω,

then the cell constant of the cell is

x \times 10^{4} m^{- 1} .

The value of

x

is ______ . (Nearest integer)

EASY

Science>Physics>Electric Current and Circuit>Resistance and Conductance

List the factors on which the resistance of a conductor depends.

EASY

Science>Physics>Electric Current and Circuit>Resistance and Conductance

On what factors does the resistance of a conductor depends?

MEDIUM

Science>Physics>Electric Current and Circuit>Resistance and Conductance

How does an increase in the temperature affect the specific resistance of a Semiconductor?

MEDIUM

Science>Physics>Electric Current and Circuit>Resistance and Conductance

Define conductance and give its unit.

MEDIUM

Science>Physics>Electric Current and Circuit>Resistance and Conductance

What is resistivity? Write the formula of resistivity. Write the SI unit of resistivity.

EASY

Science>Physics>Electric Current and Circuit>Resistance and Conductance

100 m g

mass of nichrome metal is drawn into a wire of area of cross-section

0.05 m m^{2}

. Calculate the Resistance of the wire Given the density of nichrome

8.4 \times 10^{3} k g m^{- 3}

and resistivity of the material is

1.2 \times 10^{- 6} Ω m

.

MEDIUM

Science>Physics>Electric Current and Circuit>Resistance and Conductance

Write the four factors affecting the resistance of a conductor.

EASY

Science>Physics>Electric Current and Circuit>Resistance and Conductance

What are the factors on which the resistance of a conductor depends? Explain.

EASY

Science>Physics>Electric Current and Circuit>Resistance and Conductance

Why are alloys commonly used in electrical heating devices? Give reason.

EASY

Science>Physics>Electric Current and Circuit>Resistance and Conductance

How does an increase in the temperature affect the specific resistance of a metal?

EASY

Science>Physics>Electric Current and Circuit>Resistance and Conductance

Amongst the following, the form of water with the lowest ionic conductance at

298 K

is: