ECAT Pre General Science Chapter 14 online mcq test with answers for Physics chapter 14 (Electromagnetism)

Question # 1

When some compass needles are placed on a card board along a circle with the center at the wire, they will

Point the direction of N-S
A
Set themselves tangential to the circle
B
Point in the direction of E-W
C
None of these
D
Point in direction of S-E E

Question # 2

For the conversion of galvanometer into voltmeter, we connect a

small resistance in series with galvanometer A
small resistance in parallel with galvanometer B
high resistance in parallel with galvanometer C
high resistance series with galvanometer D

Question # 3

For measuring large currents, an ordinary galvanometer cannot be used without proper, then both relates with each other as

modification A
voltage B
current C
resistance D

Question # 4

'K' is the proportionality constant of force experienced by conductor. What is the value of 'K' in SI units?

0 A
1 B
0.5 C
-1 D

Question # 5

The force exerted on a conductor of length L, carrying current I when placed in a magnetic field B is given by

F=IB/L A
F= L x B/I B
F = IL x B C
F = IL . B D

Question # 6

A long wire wound tightly on a cylindrical core is called:

Potentiometer A
Solenoid B
Toroid C
Wheat and stone bridge D
None of these E

Question # 7

The magnetic force exerted on an electron moving with velocity 'v' at right angle to the magnetic field is given by

F=eVB A
F=e²V/B B
F=e/VB C
F=B²/ev D

Question # 8

Electron gun consist of

three anodes A
heating cathode B
three anodes C
three anodes , heating cathode, grid D

Question # 9

Resistance is measured in

volts A
ampere B
ohm C
watt D

Question # 10

In order to make a voltmeter, high resistance is connected with galvanometer, in

perpendicular A
may be paralled or pendicular B
series C
none of these D

Question # 11

If the value of galvanometer constant k = C/BAN is made small, the galvanometer can be made

Sensitive A
Accurate B
Stable C
None of these D

Question # 12

The SI unit of magnetic flux is.

weber A
Nm^-1A^-1 B
tesla C
gauss D

Question # 13

When a suitable small resistance is put in parallel with the galvanometer coil, it is converted into

Voltmeter A
Avometer B
Ammeter C
None of these D

Question # 14

A voltmeter is used to measure the

potential difference A
current B
temperature C
resistance D

Question # 15

the current is pass through the straight wire. The magnetic field established around it has its lines of force:

Circular and endless
A
Oval in shape and endless
B
Straight
C
Parabolic
D
All are true E

Question # 16

The magnetic field outside the solenoid due to current is

strong A
zero B
weak C
uniform D

Question # 17

The most suitable material for permanent magnet is

cobalt A
iron B
steel C
alaminium D

Question # 18

A full-scale deflection is obtained in a galvanometer with a current of few

ampere A
volts B
milliampere C
ohm D

Question # 19

Total number of turns on 0.15 m length solenoid is 300. the value of n is:

Greater than 300 A
Smaller than 300 B
Equal to 300 C
Any of (A) or (B) D
Any of (A) or(C) E

Question # 20

The current in microamperes required to produce one millimeter deflection on a scale placed one meter away from the mirror of the galvanometer, defined the sensitivity of

ammeter A
voltmeter B
galvanometer C
avo-meter D

Question # 21

Strength of magnetic field is measured in SI units, in:

N A
N/Am B
Am/N C
Nm/A D
None of these E

Question # 22

A resistance used in galvanometer to make it voltmeter is called

shunt resistance A
high resistance B
zero resistance C
none of these D

Question # 23

The gavanometer constant of a moving coil galvanometer is given by

K=BAN/C A
K=BN/CA B
K=NAC/B C
K=C/BAN D

Question # 24

A meter wire carraying a current of 2A is at right angle to the uniform magnetic field of 0.5 Weber/m²The force on the wire is

5N A
4N B
1.5N C
6N D

Question # 25

In the formula B= µ̻ nl, the symbol n denotes:

Total number of turns of solenoid
A
Number of turns per unit length
B
Number of turns per unit volume
C
Numbers of turns per unit area
D
Number of moles
E

Question # 26

CRO deflects the beam of

proton A
a-particle B
electron C
neutron D

Question # 27

Charge to mass ratio (e/m) of an electron is given by the relation

e/m = 2V/Br² A
e/m = 2V/B²r B
e/m = 2V/B²r² C
e/m = V/2B²r² D

Question # 28

In the region surrounding a current carrying wire:

A magnetic field is setup
A
The lines of force are elliptical
B
Direction of lines of forces depends upon direction of current
C
Both (A) and (C)
D
All of these E

Question # 29

The SI unit of flux density is

Newton/Amp-meter A
Newton-m/Ampere B
Newton-m/Amp² C
Newton-Amp/meter D

Question # 30

F = I(L x B) is a

vector A
scalar B
unit vector C
none of these D

Sr.#	Question	Answer
1	How many number of anodes used in electron gun	A. one B. two C. three D. six
2	In the expression of force experienced by electron, the direction of both v and B are	A. parallel B. zero C. perpendicular D. none of them
3	(CRO) Cathode ray oscilloscope is a device used for high speed	A. velocity B. graph plotting C. time-velocity D. none of these
4	The pointer of a magnetic compass:	A. Is affected only by permanent magnets B. Align itself parallel to the applied magnetic field C. Vibrates in the magnetic field of the current D. Aligns itself perpendicular to the magnetic field
5	In the region surrounding a current carrying wire:	A. A magnetic field is setup B. The lines of force are elliptical C. Direction of lines of forces depends upon direction of current D. Both (A) and (C)
6	Strength of magnetic field is measured in SI units, in:	A. N B. N/Am C. Am/N D. Nm/A
7	The SI unit of magnetic flux is.	A. weber B. Nm^-1A^-1 C. tesla D. gauss
8	For measuring large currents, an ordinary galvanometer cannot be used without proper, then both relates with each other as	A. modification B. voltage C. current D. resistance
9	Current is measured in	A. volts B. watt C. ohm D. ampere
10	A resistance used in voltmeter is called	A. shunt resistance B. high resistance C. low resistance D. zero resistance

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ECAT Pre General Science Physics Chapter 14 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 14 Electromagnetism

ECAT Pre General Science Physics Chapter 14 Electromagnetism