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

Question # 1

Hold the solenoid in the right hand with fingers curling in the direction of current. The direction of the field will be given by:

Thumb
A
Curled fingers
B
Middle finger
C
Arm of right hand
D
None of these
E

Question # 2

A beam of electrons is provided by an

electron gun A
Suppray B
Injection C
None of these D

Question # 3

The current sensitivity of the galvanometer is

C/BAN A
BAN/C B
CAN/B C
CBN/A D

Question # 4

Ammeter is used to measure

voltage A
resistance B
voltage and current C
current D

Question # 5

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 # 6

Magnetic lines of force:

Cannot intersect at all
A
Intersect at infinity
B
Intersect within magnet
C
Intersect at Neutral Point
D
None of these E

Question # 7

When current passes through a solenoid coil, it behaves like a

loop A
circle B
bar magnet C
none of these D

Question # 8

How many number of anodes used in electron gun

one A
two B
three C
six D

Question # 9

Centripetal force for electron is given by

mv²/ r A
mv / r² B
mv²/ r C
mr²/ v D

Question # 10

A shunt resistance parallel to the galvanometer is used to convert it into

avometer A
millimeter B
voltmeter C
none of these D

Question # 11

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 # 12

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 # 13

At a given instant, a photon moves in +x direction in a region where there magnetic field in -z direction. The magnetic force on the proton will be the:

-y direction A
+y direction B
+z direction C
-z direction D
None of these E

Question # 14

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 # 15

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 # 16

Magnetic flux and flux density are related by

Flux density = flux x area A
Flux density = flux / area B
Flux density = flux - area C
None of these D

Question # 17

Electron gun consist of

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

Question # 18

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 # 19

The CRO deflects the beam of electrons, when they passes through uniform

electric field A
gravitational field B
magnetic flax C
magnetic field D

Question # 20

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 # 21

The force experienced by charged particle is maximum, if it moves

parallel to magnetic field A
perpendicular to magnetic field B
opposite to the magnetic field C
none of these D

Question # 22

if the field is directed along the normal to the area, then flux is:

Maximum
A
Equal to zero
B
Equal to BA
C
Minimum
D
Both (A) and (C)
E

Question # 23

If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of a solenoid, then magnetic field:

Becomes Half A
Becomes double B
Is not affected C
Becomes one fourth D
None of these E

Question # 24

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 # 25

It is customary represent a current flowing towards the reader by a symbol

(x) A
(+) B
(.) C
(-) D
(÷)
E

Question # 26

The unit of flux density is also given by

Weber/m²or Wb . m^-2 A
Weber/mor Wb . m B
Weber/mor Wb . m^-1 C
Weber or Wb D

Question # 27

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 # 28

The SI unit of flux density is.

Tesla A
Weber B
Gaun C
Weber/meter D

Question # 29

Amperean path is a:

Closed path
A
Rectangular path
B
Circular path
C
Any of above
D
Broken path
E

Question # 30

F = I(L x B) is a

vector A
scalar B
unit vector C
none of these D

Sr.#	Question	Answer
1	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
2	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	A. 5N B. 4N C. 1.5N D. 6N
3	A solenoid is a coil of wire which is:	A. Short, loosely wound, cylindrical B. Long, tightly wound, spherical C. Long, loosely wound, cylindrical D. Long, tightly wound, cylindrical
4	A relationship between Gauses of magnetic induction and Tesla(T) is given by	A. G 10^-3T B. G = 10^-2T C. G = 10^-4T D. G = 10^-1T
5	In a straight current carrying conductor, the direction of magnetic field can be found by	A. right hand rule B. left hand rule C. head to tall rule D. none of these
6	if the field is directed along the normal to the area, then flux is:	A. Maximum B. Equal to zero C. Equal to BA D. Minimum
7	A voltmeter is used to measure the	A. potential difference B. current C. temperature D. resistance
8	The force experienced by charged particle is maximum, if it moves	A. parallel to magnetic field B. perpendicular to magnetic field C. opposite to the magnetic field D. none of these
9	A magnetic force on an electron travelling with 10⁸ms^-1parallel to a field of strength 1 Wb m^-2is	A. Zero B. 10⁵m C. 10^-10N D. 10⁸N
10	To convert galvanometer into ammeter we connect	A. small resistance in parallel with galvanometer B. small resistance in series with galvanometer C. high resistance in series with galvanometer D. high resistance in parallel with galvanometer

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