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

Question # 1

The quantity having the same unit as that of emf is:

Force A
Energy B
Potential C
Current D
Charge E

Question # 2

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

Straight lines
A
Sine curves
B
Curved
C
Both (A) and (B)
D
None of these
E

Question # 3

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 # 4

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 # 5

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 # 6

An eV is unit of:

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

Question # 7

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 # 8

The third band of the colour code:

Gives the number of zeroes A
Is decimal multiplier B
Gives the resistance tolerance C
Gives the third digit D
Both (A) and (B) E

Question # 9

The value of resistivity is the least for:

Copper A
Aluminimum B
Silver C
Tungsten D
Iron E

Question # 10

An electric field is generated along the wire when:

Its resistance is very high
A
A constant potential is maintained across the wire
B
Net current through the wire is zero
C
A constant potential difference is maintained across the wire
D
Either (A) or (D)
E

Question # 11

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 # 12

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

Chemical energy
A
Mechanical energy
B
Heat energy
C
Both (A) and (B)
D
All of these
E

Question # 13

The inkjet printer ejects a thin stream of:

Water
A
Oil
B
Ink
C
Any of above
D
None of these
E

Question # 14

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 # 15

The flux through a closed surface depends upon:

Shape of geometry of the closed surface
A
Charge enclosed
B
Nature of the medium
C
Both (A) and (B)
D
Both (B) and (C)
E

Question # 16

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

Greater than the speed at which they pass from left to right
A
Less than the speed at which they pass from left to right
B
The same speed at which they pass from left to right
C
Any of above
D
None of them
E

Question # 17

The earth’s potential and potential at infinity are taken:

Equal
A
Zero
B
First is greater than the second
C
Second is greater than the first
D
Both (A) and (B)
E

Question # 18

The term drift velocity is used when the ends of a wire are:

Connected to a laser source
A
Connected to a voltage source
B
Not connected to a voltage source
C
At different values of potential
D
Both (B) and (D)
E

Question # 19

Gaussian surface is always:

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

Question # 20

An example of photoconductor is:

Boron
A
Carbon
B
Iron
C
Aluminum
D
Selenium
E

Question # 21

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 # 22

An important part of inkjet printer is:

Toner A
Drum
B
Deflection plates
C
Heated roles
D
None of these
E

Question # 23

Heating effect of current utilized in:

Electric motor
A
Electric toaster
B
Electroplating
C
Electric kettle
D
Both (B) and (D)
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

Conversion of chemical energy to electrical energy can be achieved by:

Primary cell
A
Secondary cell
B
Both (A) and (B)
C
Photovoltaic cell
D
Solar cell
E

Question # 26

In a metal, the valence electrons are:

Attached to individual atoms A
Not attached to individual atoms B
Free to move within the metal C
Both A and B D
Both A and C E

Question # 27

Magnetic effect of current is used:

In electric motor
A
To detect current
B
To measure current
C
All of these
D
None of these
E

Question # 28

Static electricity is produced by the transfer of:

Electrons
A
Protons
B
One fluid
C
Two fluids
D
None of these
E

Question # 29

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 # 30

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

Value of current passing
A
Distance from the current element
B
Color of the material
C
Both (A) and (B)
D
Both (B) and (C)
E

Sr.#	Question	Answer
1	The best conductor is:	A. Silver B. Copper C. Aluminimum D. Both B and C
2	The free electrons in metals:	A. Are in random motion and their speed depends upon temperature B. Move in particular direction C. Move with speed of light D. Move such that their speed does not depend on their temperature
3	The electric flux through any surface depends upon:	A. Intensity of electric field B. Area of the surface C. Angle between intensity and area D. All of these
4	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)
5	The charge carries in the electrolyte are:	A. Positive ions B. Negative ions C. Either (A) or (B) D. Both (A) and (B)
6	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
7	The device which can convert heat energy into electrical energy is called:	A. Thermistor B. Thermometer C. Thermostat D. Thermocouple
8	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
9	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
10	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

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