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

Question # 1

Electron gun consist of

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

Question # 2

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

Question # 3

Centripetal force for electron is given by

mv²/ r A
mv / r² B
mv²/ r C
mr²/ v D

Question # 4

Magnetic induction is also called as:

Ampere’s law
A
Faraday’s law
B
Lenz’s law
C
Newton’s law
D
Coulomb’s law
E

Question # 5

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 # 6

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 # 7

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 # 8

Avo-meter is used of measure the

current, voltage A
voltage, resistance B
resistance, current C
current, voltage and resistance D

Question # 9

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 # 10

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

loop A
circle B
bar magnet C
none of these D

Question # 11

The SI unit of magnetic induction is

Gauses A
Tesla B
Weber C
Weber² D

Question # 12

A field is uniform and much stronger:

Inside a long solenoid
A
Outside a long solenoid
B
At the end of a long solenoid
C
At the central point of long solenoid
D
None of these
E

Question # 13

The direction of lines of force depends upon the direction of

voltage A
current B
charges C
none of these D

Question # 14

The magnetic field inside a solenoid can be increased by:

Increasing n A
Decreasing I B
Increasing I C
By using iron core within solenoid D
All correct except (B) E

Question # 15

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 # 16

The SI unit of flux density is

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

Question # 17

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 # 18

Flurescent screen is a screen where visible spot

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

Question # 19

Tesla is the unit of

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

Question # 20

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 # 21

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 # 22

The SI unit of flux density is.

Tesla A
Weber B
Gaun C
Weber/meter D

Question # 23

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 # 24

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 # 25

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 # 26

A current carrying conductor is placed at right angle to the magnetic field. The magnetic force experienced by the conductor is

minimum A
maximum B
zero C
none of these D

Question # 27

A voltmeter is used to measure the

potential difference A
current B
temperature C
resistance D

Question # 28

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 # 29

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 # 30

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

Sr.#	Question	Answer
1	When the waveform of one voltage is increasing and that of second is decreasing and vice versa, then phase difference between these voltage is	A. 90° B. 75° C. 0° D. 180°
2	Lorentz force is defined as	A. q(E + V x B) B. q(E x B + V) C. q(E x V + B) D. q(E x B)
3	A shunt resistance parallel to the galvanometer is used to convert it into	A. avometer B. millimeter C. voltmeter D. none of these
4	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
5	When some compass needles are placed on a card board along a circle with the center at the wire, they will	A. Point the direction of N-S B. Set themselves tangential to the circle C. Point in the direction of E-W D. None of these
6	A current carrying conductor is placed at right angle to the magnetic field. The magnetic force experienced by the conductor is	A. minimum B. maximum C. zero D. none of these
7	'K' is the proportionality constant of force experienced by conductor. What is the value of 'K' in SI units?	A. 0 B. 1 C. 0.5 D. -1
8	In the formula B= µ̻ nl, the symbol n denotes:	A. Total number of turns of solenoid B. Number of turns per unit length C. Number of turns per unit volume D. Numbers of turns per unit area
9	A charged particle moving at right angle to the magnetic field will experience	A. minimum force B. maximum force C. zero D. moderate force
10	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:	A. -y direction B. +y direction C. +z direction D. -z direction

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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