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

Question # 1

The voltage increases linearly with

time A
velocity B
acceleration C
torque D

Question # 2

The current is measured in

volts A
watt B
ampere C
ohm D

Question # 3

The force experienced by a single charge carrier moving with velocity 'v' i magnetic field of strength 'B' is given by

F =q(v/B) A
F=q²(v x B) B
F=q(v x B) C
F= vx B D

Question # 4

Amperean path is a:

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

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

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 # 7

The field around a moving charge is called

magnetic field A
conservative field B
non-conservative field C
none of these D

Question # 8

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 # 9

The e/m of an electron moving in a circular path in a magnetic field is equal to

V/Br A
V/B²r² B
V²/Br² C
V²/Br D

Question # 10

The SI unit of flux density is

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

Question # 11

Which is modified form of galvanometer

potentiometer A
battery B
voltmeter C
slide wire bridge D

Question # 12

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 # 13

A beam of electrons is provided by an

electron gun A
Suppray B
Injection C
None of these D

Question # 14

The working of galvanometer depends upon torque exerted on a current carrying coil in

magnetic field A
electric field B
gravitational field C
nuclear field 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

How many number of anodes used in electron gun

one A
two B
three C
six D

Question # 17

Resistance is measured in

volts A
ampere B
ohm C
watt D

Question # 18

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 # 19

The current sensitivity of the galvanometer is

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

Question # 20

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 # 21

Magnetic flux passing through the an element of are A placed perpendicular to a uniform magnetic field Bis:

Maximum A
Minimum B
Zero C
Very small D
None of these E

Question # 22

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 # 23

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 # 24

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 # 25

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 # 26

magnetic field is a:

Vector quantity
A
Scalar quantity
B
Scalar as well as scalar quantity
C
Any of (A) or (B)
D
Neither (A) nor (B) E

Question # 27

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 # 28

Lorentz force is defined as

q(E + V x B) A
q(E x B + V) B
q(E x V + B) C
q(E x B) D

Question # 29

A charged particle moving at right angle to the magnetic field will experience

minimum force A
maximum force B
zero C
moderate force D

Question # 30

41 The force experience, when proton projected in a magnetic field with velocity 'v' is

+e(v x B) A
-C(V x B) B
+e²(v x B) C
-e(v²x B) D

Sr.#	Question	Answer
1	The SI unit of magnetic induction is	A. Gauses B. Tesla C. Weber D. Weber²
2	The magnetic field outside the solenoid due to current is	A. strong B. zero C. weak D. uniform
3	The sources of magnetic field are	A. isolated magnetic poles B. charges at rest C. charges in motion D. none of these
4	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
5	A shunt resistance parallel to the galvanometer is used to convert it into	A. avometer B. millimeter C. voltmeter D. none of these
6	The unit of magnetic flux is	A. Weber-m² B. Weber-m³ C. Henry D. Weber
7	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	A. magnetic flux B. magnetic induction C. magnetic field D. self inductance
8	The vector representation of force experience give the direction of	A. magnetic field B. current C. length of conductor D. force
9	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
10	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

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