ECAT Pre Engineering Physics Chapter 13 MCQ Test With Answer

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

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Physics ECAT Pre Engineering Chapter 13 Current Electricity

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Question # 1

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

Question # 2

SI unit of current describes the flow of charge at the rate of

Question # 3

As the current flows through the wire

Question # 4

Electric flux is:

Question # 5

The current that flows through the coil of a motor causes

Question # 6

The magnitude of chemical Effects depends upon:

Question # 7

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

Question # 8

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

Question # 9

The free electrons in metals:

Question # 10

The value of resistivity is the least for:

Question # 11

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

Question # 12

If the ends of a wire are connected to a battery an electric field E will be set up at:

Question # 13

A field free region is found:

Question # 14

The emf is measured in:

Question # 15

The charge carries in the electrolyte are:

Question # 16

The value of relative permittivity of different dielectrics are:

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

The best conductor is:

Question # 21

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

Question # 22

An inkjet printer uses in its operation:

Question # 23

Electrolysis is the study of conduction of electricity through:

Question # 24

Certain charge +q is placed at the center of a sphere. At each of the sphere,The directions of electric intensity and vector area are:

Question # 25

Aluminum is a:

Question # 26

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

Question # 27

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

Question # 28

Static electricity is produced by the transfer of:

Question # 29

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

Question # 30

Thermistors are prepared under

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Sr. # Question Answer
1 An important part of photocopier is:

A.

Toner cartridge

B. Deflection plates

C.

Charging electrode

D.

Print head
2 The best conductor is:

A. Silver

B. Copper

C.Aluminimum

D. Both B and C

3 Most practical application of electricity involve

A.

Charges at the rest

B.

Charges in the motion

C.

Electrons at rest

D.

Atoms in motion
4 A rheostat can e used:

A. As variable resistor

B. As potential divider

C.For varying the current

D. All of these

5

An inkjet printer uses in its operation:

A.

Neutrons only

B.

Mesons only

C.

Positrons and photons

D.

An electric charge
6

The charge carries in the electrolyte are:

A.

Positive ions

B.

Negative ions

C.

Either (A) or (B)

D.

Both (A) and (B)
7

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)
8 In case of metallic conductors, the charge carriers are

A. Protons

B. Electrons

C.Antiprotons

D. Positrons

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

A.

Flux in that region

B.

Intensity of the field

C.

Charge

D.

Area of the region
10 As the current flow through the wire:

A.

It generates heat in the wire

B.

It produces sound in the wire

C.

Resistance of the wire decreases

D.

Voltage across the ends is increased
11 Static electricity is produced by the transfer of:

A.

Electrons

B.

Protons

C.

One fluid

D.

Two fluids
12 An ideal voltmeter has:

A. Zero resistance

B. Small resistance

C.Large resistance

D. Infinite resistance

13 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

14 In a metal, the valence electrons are:

A. Attached to individual atoms

B. Not attached to individual atoms

C.Free to move within the metal

D. Both A and B

15

Flux through a closed surface of any shape and flux through the surface of a sphere drawn around a charge are:

A.

Different

B.

Same

C.

Such that it is greater in the first case

D.

Such that it is greater in the second case
16 The fourth band is a:

A. Silver band

B. Red band

C.Gold band

D. Either A or C

17 Which instrument is expensive and difficult to use?

A. Voltmeter

B. Potentiometer

C.CRO

D. Both A and C

18 Electrolysis is the study of conduction of electricity through:

A. Solids

B. Liquids

C.Gases

D. Plasma

19 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
20

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)
21

Heating effect of current utilized in:

A.

Electric motor

B.

Electric toaster

C.

Electroplating

D.

Electric kettle
22 Aluminum is a:

A.

Good insulator

B.

Bad conductor

C.

Both (A) and (B)

D.

Excellent conductor
23

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
24

The obvious effect/s of current is/are:

A.

Heating effect

B.

Magnetic effect

C.

Chemical effect

D.

Both (C) and (B)
25 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

26 As the current flows through the wire

A. It generates heat in the wire

B. It produces sound in the wire

C.Resistance of the wire decrease

D. Voltage across the ends is the increase

27 In gases, the charge carriers are:

A. Electrons

B. Positive ions

C.Negative ions

D. Both A and C

28 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
29 Field lines are closer to each other in the region where the field is:

A.

Stronger

B.

Weaker

C.

Much weaker

D.

Absent
30 The emf is measured in:

A. Newton

B. Volt

C.J/C

D. Both A and B

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