ECAT Pre General Science Physics Chapter 13 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 13 Current Electricity

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 13 Current Electricity

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ECAT Pre General Science Physics Chapter 13 Current Electricity

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Question # 1

When two spherical conducting balls at different potentials are joined by a metallic wire, after some time:

Question # 2

Gaussian surface is always:

Question # 3

The number of field lines passing through unit area held perpendicular to the field lines represent:

Question # 4

When two spherical conducting balls at different potentials are joined by metallic wire, the current starts:

Question # 5

The best conductor is:

Question # 6

The positive charge moving in one direction is equivalent in all external affects to a:

Question # 7

Which of the following substances has got positive temperature coefficient of resistance?

Question # 8

The interior of a hollow charged metal sphere is a region which:

Question # 9

The electric flux through any surface depends upon:

Question # 10

Most practical application of electricity involve

Question # 11

The charge carriers in an electrolyte are

Question # 12

The value of relative permittivity of different dielectrics are:

Question # 13

In order to have a constant current through wire, the potential difference across its end should:

Question # 14

A current of 1 ampere is passing through a conductor. The charge passing through it in half a minute s

Question # 15

The conventional current is the name given to current due to flow of:

Question # 16

Field lines are closer to each other in the region where the field is:

Question # 17

Thermistors are prepared under

Question # 18

As the current flows through the wire

Question # 19

Two dissimilar metals joined at their ends kept at constant temperature constitute:

Question # 20

The charge carries in the electrolyte are:

Question # 21

A field free region is found:

Question # 22

Selenium is:

Question # 23

In case of metallic conductors, the charge carriers are

Question # 24

The free electrons in metals:

Question # 25

An eV is unit of:

Question # 26

When certain area A is held parallel to the field lines, then:

Question # 27

The current that flows through the coil of a motor causes

Question # 28

A rheostat can e used:

Question # 29

Most practical applications of electricity involve

Question # 30

As the current flow through the wire:

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Sr.# Question Answer
1

Two dissimilar metals joined at their ends kept at constant temperature constitute:

A.

Cell

B.

Voltmeter

C.

Thermocouple

D.

Potentiometer

2 Most practical application of electricity involve
A.

Charges at the rest

B.

Charges in the motion

C.

Electrons at rest

D.

Atoms in motion

3 Selenium is:
A.

An insulator

B.

A conductor

C.

Insulator in the dark and becomes conductor when exposed to light

D.

Conductor in the dark only

4 The strength of magnetic field at certain points around a wire depends upon:
A.

Value of current passing

B.

Distance from the current element

C.

Color of the material

D.

Both (A) and (B)

5

In case of two identical charges placed certain distance apart, the electric field lines are:

A.

Straight lines

B.

Sine curves

C.

Curved

D.

Both (A) and (B)

6

Electric flux is:

A. Cross product of two vector

B.

Dot product of two vectors

C.

A vector quantity

D.

A scalar quantity

7 The interior of a hollow charged metal sphere is a region which:
A.

Contain some magnitude of electric field

B.

Is full of electric field lines

C.

Is field-free region

D.

Either (A) or (B)

8

While finding the electric intensity at a point between two oppositely charged parallel plates, the Gaussian surface is taken in the form of a hollow:

A.

Circle

B.

Rectangle

C.

Sphere

D.

Box

9

The current of 1 ampere is passing through a conductor. The charge passing through it in half a minute is:

A.

One coulomb

B.

0.5 coulomb

C.

30 coulomb

D.

2 coulombs

10 The charge carriers in an electrolyte are
A. Positive ions
B. Negative ions
C. Either A or B
D. Both A and B
11 The third band of the colour code:
A. Gives the number of zeroes
B. Is decimal multiplier
C. Gives the resistance tolerance
D. Gives the third digit
12

When two spherical conducting balls at different potentials are joined by a metallic wire, after some time:

A.

Both the conductors are at the same potential

B.

Potential difference across the conductors remain constant

C.

Potential difference across the conductors becomes zero

D.

Both (A) and (B)

13 The positive charge moving in one direction is equivalent in all external affects to a:
A.

Negative charge is moving in the same direction

B.

Positive charge is moving in the opposite direction

C.

Negative charge moving in the opposite direction

D.

Positive charges moving in the same direction

14 An electric field is generated along the wire when:
A.

Its resistance is very high

B.

A constant potential is maintained across the wire

C.

Net current through the wire is zero

D.

A constant potential difference is maintained across the wire

15

The rate at which the free electrons pass through any section of a metallic wire from right to left is:

A.

Greater than the speed at which they pass from left to right

B.

Less than the speed at which they pass from left to right

C.

The same speed at which they pass from left to right

D.

Any of above

16

The magnitude of chemical Effects depends upon:

A.

Nature of liquid

B.

Quantity of Electricity passed through the liquid

C.

Color of the liquid

D.

Both (A) and (C)

17 Electric field lines emerge from the charge in:
A.

One dimension

B.

Two dimensions

C.

Three dimensions

D.

Four dimensions

18 When resistance of a current carrying wire increases due to rise in temperature, the drift velocity of electrons:
A.

Decreases

B.

Increases

C.

Remains the constant

D.

Either of these

19

The effects of bends in a wire on its electrical resistance are:

A.

Zero

B.

Much larger

C.

Larger

D.

Smaller

20

The example/s of non-electrical energy to electrical is/are:

A.

Chemical energy

B.

Mechanical energy

C.

Heat energy

D.

Both (A) and (B)

21

The charge carries in the electrolyte are:

A.

Positive ions

B.

Negative ions

C.

Either (A) or (B)

D.

Both (A) and (B)

22 The value of relative permittivity of different dielectrics are:
A.

Equal

B.

Different

C.

Greater than one

D.

Smaller than one

23 When a constant potential difference is applied across the conductor, the drift velocity of electrons:
A.

Increases

B.

Decreases

C.

Remains the constant

D.

Either of these

24 The passage of current is accompanied by a magnetic field in the surrounding space:
A.

Always accompanied

B.

Sometimes accompanied

C.

Never accompanied

D. Any of above

25 In a metal, the valence electrons are:
A.

Attach to individual atoms

B.

Not attached to individual atoms

C.

Free to move within the metal

D.

Both (A) and (C)

26 Aluminum is a:
A.

Good insulator

B.

Bad conductor

C.

Both (A) and (B)

D.

Excellent conductor

27

In order to have a constant current through wire, the potential difference across its end should:

A.

Be zero

B.

Be maintained constant

C.

Goes on increasing

D.

Go on decreasing

28 In case of metallic conductors, the charge carriers are
A. Protons
B. Electrons
C. Antiprotons
D. Positrons
29

The rate at which the free electrons pass through any section of a metallic wire from right to left is:

A.

Greater than the speed at which they pass from left to right

B.

Less than the speed at which they pass from left to right

C.

The same speed at which they pass from left to right

D.

Any of above

30 The earth’s potential and potential at infinity are taken:
A.

Equal

B.

Zero

C.

First is greater than the second

D.

Second is greater than the first

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