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

Question # 1

The direction of lines of force depends upon the direction of

voltage A
current B
charges C
none of these D

Question # 2

The SI unit of magnetic flux is

NmA^-2 A
NmA^-1 B
NAm^-1 C
Nm²A^-1 D

Question # 3

'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 # 4

The unit of magnetic flux is

Weber-m² A
Weber-m³ B
Henry C
Weber D

Question # 5

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

Question # 6

NmA^-1is commonly called:

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

Question # 7

A relationship between Gauses of magnetic induction and Tesla(T) is given by

G 10^-3T A
G = 10^-2T B
G = 10^-4T C
G = 10^-1T D

Question # 8

When the waveform of one voltage is increasing and that of second is decreasing and vice versa, then phase difference between these voltage is

90° A
75° B
0° C
180° D

Question # 9

The most suitable material for permanent magnet is

cobalt A
iron B
steel C
alaminium D

Question # 10

The permeability of free space is measured in:

Wb/Am A
Wb A/m B
Am/Wb C
m/Web A D
None of these E

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

A galvanometer in which the coil comes to rest quickly after the current passed through it, or the current stopped form flowing through it, is called

dead beat galvanometer A
stable galvanometer B
shunt galvanometer C
sensitive galvanomter D

Question # 13

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 # 14

The pointer of a magnetic compass:

Is affected only by permanent magnets
A
Align itself parallel to the applied magnetic field
B
Vibrates in the magnetic field of the current
C
Aligns itself perpendicular to the magnetic field
D
Both (C) and (D) E

Question # 15

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 # 16

F = I(L x B) is a

vector A
scalar B
unit vector C
none of these D

Question # 17

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 # 18

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 # 19

To convert galvanometer into ammeter we connect

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

Question # 20

The SI unit of magnetic permeability is

WB A^-1m^-1 A
WB mA^-1 B
WB Am^-1 C
None of these D

Question # 21

The SI unit of magnetic flux is.

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

Question # 22

A solenoid is a coil of wire which is:

Short, loosely wound, cylindrical
A
Long, tightly wound, spherical
B
Long, loosely wound, cylindrical
C
Long, tightly wound, cylindrical
D
None of these
E

Question # 23

Tesla is the unit of

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

Question # 24

Weber is a unit of

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

Question # 25

The force acting as one meter length of the conductor placed at right angle to the magnetic field, when one A current is passing through it, defines the

magnetic flux A
magnetic induction B
magnetic field C
self inductance D

Question # 26

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 # 27

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 # 28

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 # 29

A galvanometer is an instrument used to

measure voltage across a circuit A
detect current in a circuit B
measure current flowing through a circuit C
none of these D

Question # 30

The CRO is used for displaying the waveform of a given

current A
voltage B
both of them C
none of them D

Sr.#	Question	Answer
1	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	A. n/AL B. Al/n C. nAL D. nA/L
2	The magnetic field outside the solenoid due to current is	A. strong B. zero C. weak D. uniform
3	Which one of the following relations is correct?	A. 1 Wb-m²= Nm^-1A^-1 B. 1 tesla = 104 gausses C. 1 Wb-m²= 1 tesla D. All of the above
4	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
5	If the value of galvanometer constant k = C/BAN is made small, the galvanometer can be made	A. Sensitive B. Accurate C. Stable D. None of these
6	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
7	The working of galvanometer depends upon torque exerted on a current carrying coil in	A. magnetic field B. electric field C. gravitational field D. nuclear field
8	The SI unit of flux density is	A. Newton/Amp-meter B. Newton-m/Ampere C. Newton-m/Amp² D. Newton-Amp/meter
9	(CRO) Cathode ray oscilloscope is a device used for high speed	A. velocity B. graph plotting C. time-velocity D. none of these
10	The unit of flux density is also given by	A. Weber/m²or Wb . m^-2 B. Weber/mor Wb . m C. Weber/mor Wb . m^-1 D. Weber or Wb

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