ECAT Pre General Science Chapter 13 online mcq test with answers for Physics chapter 13 (Current Electricity)

Question # 1

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

Both the conductors are at the same potential
A
Potential difference across the conductors remain constant
B
Potential difference across the conductors becomes zero
C
Both (A) and (B)
D
Both (A) and (C)
E

Question # 2

Gaussian surface is always:

Rectangular
A
Spherical
B
Cylindrical
C
Box shape
D
Any of these
E

Question # 3

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

Flux in that region
A
Intensity of the field
B
Charge
C
Area of the region
D
None of these
E

Question # 4

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

Decreasing from zero to maximum
A
Increasing from zero to maximum
B
Decreasing from maximum to zero
C
Increasing from maximum to zero
D
Both (A) and (D)
E

Question # 5

The best conductor is:

Silver A
Copper B
Aluminimum C
Both B and C D
None of them E

Question # 6

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

Negative charge is moving in the same direction
A
Positive charge is moving in the opposite direction
B
Negative charge moving in the opposite direction
C
Positive charges moving in the same direction
D
None of these
E

Question # 7

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

Carbon A
Germanium B
Silicon C
Aluminium D
None of these E

Question # 8

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

Contain some magnitude of electric field
A
Is full of electric field lines
B
Is field-free region
C
Either (A) or (B)
D
None of these
E

Question # 9

The electric flux through any surface depends upon:

Intensity of electric field
A
Area of the surface
B
Angle between intensity and area
C
All of these
D
None of these
E

Question # 10

Most practical application of electricity involve

Charges at the rest
A
Charges in the motion
B
Electrons at rest
C
Atoms in motion
D
Molecules in motion
E

Question # 11

The charge carriers in an electrolyte are

Positive ions A
Negative ions B
Either A or B C
Both A and B D
Neither A nor B E

Question # 12

The value of relative permittivity of different dielectrics are:

Equal
A
Different
B
Greater than one
C
Smaller than one
D
Both (B) and (C)
E

Question # 13

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

Be zero
A
Be maintained constant
B
Goes on increasing
C
Go on decreasing
D
Both (A) and (B)
E

Question # 14

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

One coulomb A
0.5 coulomb B
30 coulombs C
2 coulombs D
None of these E

Question # 15

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

Positrons A
Positive charges
B
Negative charges
C
Both (A) and (C)
D
None of these
E

Question # 16

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

Stronger
A
Weaker
B
Much weaker
C
Absent
D
None of these
E

Question # 17

Thermistors are prepared under

High pressure and low temperature A
High pressure and high temperature B
Low pressure and low temperature C
Low pressure and high temprature D
None of these E

Question # 18

As the current flows through the wire

It generates heat in the wire A
It produces sound in the wire B
Resistance of the wire decrease C
Voltage across the ends is the increase D
None of these E

Question # 19

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

Cell
A
Voltmeter
B
Thermocouple
C
Potentiometer
D
None of these E

Question # 20

The charge carries in the electrolyte are:

Positive ions
A
Negative ions
B
Either (A) or (B)
C
Both (A) and (B)
D
Neither (A) nor (B)
E

Question # 21

A field free region is found:

Near the outer surface of a hollow charged metal sphere
A
In the interior of solid metal uncharged sphere
B
In the interior of solid metal charged sphere
C
Both (A) and (B)
D
Both (A) and (C)
E

Question # 22

Selenium is:

An insulator
A
A conductor
B
Insulator in the dark and becomes conductor when exposed to light
C
Conductor in the dark only
D
None of these
E

Question # 23

In case of metallic conductors, the charge carriers are

Protons A
Electrons B
Antiprotons C
Positrons D
Both A and B E

Question # 24

The free electrons in metals:

Are in random motion and their speed depends upon temperature
A
Move in particular direction
B
Move with speed of light
C
Move such that their speed does not depend on their temperature
D
None of these
E

Question # 25

An eV is unit of:

Potential
A
Energy
B
Work
C
Power
D
Both (B) and(C)
E

Question # 26

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

No lines cross this area
A
Maximum lines pass through this area
B
The number of lines are between zero and maximum
C
Both (A) and (B) correct
D
None of these
E

Question # 27

The current that flows through the coil of a motor causes

Its shaft to revolve A
Its brushes to rotate B
Motor to move C
Its shaft to rotate D
None of these E

Question # 28

A rheostat can e used:

As variable resistor A
As potential divider B
For varying the current C
All of these D
None of these E

Question # 29

Most practical applications of electricity involve

Charges at rest A
Charges in motion B
Electrons at rest C
Atoms in motion D
Molecules in motion E

Question # 30

As the current flow through the wire:

It generates heat in the wire
A
It produces sound in the wire
B
Resistance of the wire decreases
C
Voltage across the ends is increased
D
None of these E

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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ECAT Pre General Science Physics Chapter 13 MCQ Test With Answer

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

ECAT Pre General Science Physics Chapter 13 Current Electricity