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

Question # 1

The straight current carrying conductor experiences maximum force in a uniform magnetic field when it is placed

parallel to the field A
Perpendicular to the field B
At an angle of 45 to the field C
None of the above D

Question # 2

NmA^-1is commonly called:

Weber A
Apmere B
Guass C
Coulomb D
None of these E

Question # 3

Weber is a unit of

magnetic flux A
magnetic filed intensity B
magnetic induction C
magnetic flux density D

Question # 4

Magnetic flux passing through a element whose vector area makes an angle0º with lines of magnetic force is:

BACosѲ
A
Zero B
BA C
BA sinѲ D
None of these E

Question # 5

In a moving coil galvanometer, the deflecting couple depends upon

area of the coil A
number of turns of coil B
value of magnetic field C
all of the above D

Question # 6

Method "lamp and scale arrangement" used to measure the

angle of deflection A
restoring torque B
magnetic field strength C
current D

Question # 7

The unit of magnetic flux is

Weber-m² A
Weber-m³ B
Henry C
Weber D

Question # 8

If current through conductor is 1 A and length of conductor is 1m placed at right angle to the magnetic field, then the strength of magnetic field is

F = B² A
F = 0 B
F = B C
F = B/2 D

Question # 9

When the charged particle is projected at right angles to the field, then experienced by it will be:

Maximum A
Zero B
qvB C
Both (A) and (B) D
Both (A) and (C) E

Question # 10

The SI unit of flux density is.

Tesla A
Weber B
Gaun C
Weber/meter D

Question # 11

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 # 12

The force acting on a charge moving in a magnetic field

is perpendicular to the both magnetic field and direction of motion A
is proportional to the magnetic of charges B
vanishes when the motion is directly opposite to the direction of field C
all of the above D

Question # 13

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 # 14

The galvanometer can be made sensitive if the value of the factor C/BAN is

constant A
small B
large C
none of these D

Question # 15

When an electron enters in a magnetic field right angle to its motion, the magnitude of its velocity will be

changed A
zero B
unchanged C
none of these D

Question # 16

Ammeter is used to measure

voltage A
resistance B
voltage and current C
current D

Question # 17

A resistance used in voltmeter is called

shunt resistance A
high resistance B
low resistance C
zero resistance D

Question # 18

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 # 19

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 # 20

Gauss(G) is smaller unit of magnetic induction which is related to tesla(T) as

IT = 10^-4G A
IT = 10⁵G B
IT = 10³G C
IT = 10⁴G D

Question # 21

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 # 22

The SI unit of magnetic flux is

NmA^-2 A
NmA^-1 B
NAm^-1 C
Nm²A^-1 D

Question # 23

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 # 24

If volume of wire is 'AL' and there are 'n' numbers of charge carriers per unit volume, then the total number of charge carriers are

n/AL A
Al/n B
nAL C
nA/L D

Question # 25

Flurescent screen is a screen where visible spot

vanishes A
is made B
becomes small and large C
none of these D

Question # 26

The working of all DC electric meters (galvanometers, ammetersand voltmeters) depends upon

Heating effect of current A
Chemical effect of current B
Magnetic effect of current C
Electromagnetic effect of current D

Question # 27

The angle of deflection of coil can be measured by the

one method A
three method B
two method C
none of these D

Question # 28

Tesla is the unit of

Magnetic induction or flux density A
Magnetic flux B
Self inductance C
None of these D

Question # 29

A voltmeter is used to measure the

potential difference A
current B
temperature C
resistance D

Question # 30

Which one of the following relations is correct?

1 Wb-m²= Nm^-1A^-1 A
1 tesla = 104 gausses B
1 Wb-m²= 1 tesla C
All of the above D

Sr.#	Question	Answer
1	The unit of magnetic flux is	A. Weber-m² B. Weber-m³ C. Henry D. Weber
2	A shunt resistance parallel to the galvanometer is used to convert it into	A. avometer B. millimeter C. voltmeter D. none of these
3	It is customary represent a current flowing towards the reader by a symbol	A. (x) B. (+) C. (.) D. (-)
4	When a suitable small resistance is put in parallel with the galvanometer coil, it is converted into	A. Voltmeter B. Avometer C. Ammeter D. None of these
5	the current is pass through the straight wire. The magnetic field established around it has its lines of force:	A. Circular and endless B. Oval in shape and endless C. Straight D. Parabolic
6	Resistance is measured in	A. volts B. ampere C. ohm D. watt
7	Gauss(G) is smaller unit of magnetic induction which is related to tesla(T) as	A. IT = 10^-4G B. IT = 10⁵G C. IT = 10³G D. IT = 10⁴G
8	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	A. ammeter B. voltmeter C. galvanometer D. avo-meter
9	The CRO deflects the beam of electrons, when they passes through uniform	A. electric field B. gravitational field C. magnetic flax D. magnetic field
10	The force exerted on a conductor of length L, carrying current I when placed in a magnetic field B is given by	A. F=IB/L B. F= L x B/I C. F = IL x B D. F = IL . B

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