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

Question # 1

The surface destiny of charge is defined is:

Charge per volume
A
Mass per volume
B
Charge per area
C
Mass per area
D
Both (B) and (C)
E

Question # 2

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 # 3

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 # 4

Electrolysis is the study of conduction of electricity through:

Solids A
Liquids B
Gases C
Plasma D

Question # 5

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 # 6

Aluminum is a:

Good insulator
A
Bad conductor
B
Both (A) and (B)
C
Excellent conductor
D
Semiconductor
E

Question # 7

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 # 8

A thermistor is a resistor which is:

Light Sensitive A
Heat Sensitive B
Sound Sensitive C
All of these D
None of these E

Question # 9

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 shafts to rotate
D
None of these
E

Question # 10

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 # 11

In gases, the charge carriers are:

Electrons A
Positive ions B
Negative ions C
Both A and C D
Both A and B E

Question # 12

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

Increases
A
Decreases
B
Remains the constant
C
Either of these
D
None of these
E

Question # 13

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 # 14

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 # 15

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 # 16

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

Always accompanied
A
Sometimes accompanied
B
Never accompanied
C
Any of above
D
None of these
E

Question # 17

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 # 18

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 # 19

The value of resistivity is the least for:

Copper A
Aluminimum B
Silver C
Tungsten D
Iron E

Question # 20

The device which can convert heat energy into electrical energy is called:

Thermistor
A
Thermometer
B
Thermostat
C
Thermocouple
D
Both (C) and (D)
E

Question # 21

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

Decreases
A
Increases
B
Remains the constant
C
Either of these
D
None of these
E

Question # 22

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 # 23

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 # 24

In case of metallic conductors, the change carries are:

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

Question # 25

The magnitude of chemical Effects depends upon:

Nature of liquid
A
Quantity of Electricity passed through the liquid
B
Color of the liquid
C
Both (A) and (C)
D
Both (A) and (B)
E

Question # 26

In a metal, the valence electrons are:

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

Question # 27

Electrostatics is the branch of physics which deals with the study of electro charges:

At rest
A
At rest under the action of electric forces
B
In motion under the action of electric forces
C
In motion
D
At rest under the action of nuclear forces
E

Question # 28

The emf is measured in:

Newton A
Volt B
J/C C
Both A and B D
Both B and C 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

Which instrument is expensive and difficult to use?

Voltmeter A
Potentiometer B
CRO C
Both A and C D
Both A and B E

Sr.#	Question	Answer
1	The best conductor is:	A. Silver B. Copper C. Aluminimum D. Both B and C
2	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
3	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
4	The obvious effect/s of current is/are:	A. Heating effect B. Magnetic effect C. Chemical effect D. Both (C) and (B)
5	Magnetic effect of current is used:	A. In electric motor B. To detect current C. To measure current D. All of these
6	Field lines are closer to each other in the region where the field is:	A. Stronger B. Weaker C. Much weaker D. Absent
7	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
8	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
9	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
10	Thermistors are prepared under	A. High pressure and low temperature B. High pressure and high temperature C. Low pressure and low temperature D. Low pressure and high temprature

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ECAT Pre General Science Physics Chapter 13 MCQ Test With Answer

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ECAT Pre General Science Physics Chapter 13 Current Electricity