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conducting material

Total questions: 21

Worksheet time: 11mins

Name
Class
Date
1.

The unit of electrical conductivity is _________________

a)

ohm m

b)

mho m

c)

mho m-1

d)

ohm m-1

2.

the unit of electrical resistance is

a)

mho/m

b)

mho m

c)

ohm

d)

ohm/m

3.

The unit of electrical resistivity

a)

mho/m

b)

mho m

c)

ohm/m

d)

ohm m

4.

The unit of conductance is

a)

mho m

b)

mho

c)

ohm

d)

ohm/m

5.

The unit of mobility is

a)

S-1 m-2 V-2

b)

m2 S-1 V

c)

m-2 V S

d)

V-1 S-1m2

6.

The unit of drift velocity

a)

m/s2

b)

m/s

c)

m s

d)

m2s

7.

The resistance of the most of the conducting materials _________ with increase in temperature.

a)

decrease

b)

remain same

c)

increases

d)

decreases i and then ncreases

8.

Resistivity of conductors is most affected by

a)

current

b)

pressure

c)

temperature

d)

composition

9.

In metals the type of bond present is

a)

covalent bond

b)

metallic bond

c)

ionic bond

d)

organic bond

10.

Gold and silver are

a)

insulating materials

b)

magnetic materials

c)

low resistivity conducting materials

d)

dielectric materials

11.

Example of high resistivity material is

a)

Silver

b)

Gold

c)

Copper

d)

Nichrome

12.

Metals are good conductors of electricity because

a)

the atoms are lightly packed

b)

they have high melting point

c)

they have high resistivity

d)

they contain free electrons

13.

The average distance travelled by an electron

a)

collision time

b)

relaxation time

c)

mean free path

d)

collision path

14.

 For metals, relaxation time  (τ)\left(\tau\right)   is equal to 

a)

mean free path

b)

collision time

c)

mobility

d)

collision path

15.

Time taken by an electron to reach its equilibrium position from the disturbed position due to the application of external field is

a)

relaxation time

b)

collision time

c)

mean free path

d)

collision path

16.

Classical free electron theory explains the conductivity of

a)

semiconductors

b)

conductors

c)

superconductros

d)

insulators

17.

According to classical free electron theory, electrons obey

a)

Fermi distribution statistics

b)

Bose Einstein statistics

c)

Maxwell Boltzmann statistics

d)

all of the above

18.

The velocity gained by the electron per unit electric field strength is called

a)

Drift velocity

b)

mobility

c)

relaxation time

d)

mean free path

19.

The microscopic form of Ohm's law is

a)

J=σEJ=\frac{\sigma}{E}

b)

σ=JE\sigma=\frac{J}{E}

c)

J=EσJ=\frac{E}{\sigma}

d)

J=σEJ=\sigma E

20.

Calculate the drift velocity of the free electrons with a mobility of 3.5 x 10-3 m2 V-1 s-1 in copper for an electric field strength of 0.5 V/m

a)

1.75 m/s

b)

0.00175 m/s

c)

0.175 m/s

d)

0.0175 m/s

21.

The current density per unit electric field is known as ________

a)

Electrical conductivity

b)

Thermal conductivity

c)

mobility

d)

mean free path

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