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

Question # 1

The magnetic field outside the solenoid due to current is

strong A
zero B
weak C
uniform D

Question # 2

Centripetal force for electron is given by

mv²/ r A
mv / r² B
mv²/ r C
mr²/ v D

Question # 3

The SI unit of magnetic flux is.

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

Question # 4

NmA^-1is commonly called:

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

Question # 5

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 # 6

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 # 7

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 # 8

Ammeter is used to measure

voltage A
resistance B
voltage and current C
current D

Question # 9

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 # 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

The force experienced by an electron projected in a magnetic field B with a velocity V is given by

F=e(V x B) A
F= -e(V x B) B
F= e(B x V) C
Both a and c D

Question # 12

The field around a moving charge is called

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

Question # 13

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 # 14

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 # 15

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 # 16

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 # 17

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 # 18

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 # 19

The torque per unit twist of coil is called

proportionality constant A
gravitational constant B
boltzman constant C
coupling constant D

Question # 20

Flurescent screen is a screen where visible spot

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

Question # 21

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 # 22

The SI unit of flux density is.

Tesla A
Weber B
Gaun C
Weber/meter D

Question # 23

The strength of magnetic field around the current conductor is

Smaller near the conductor A
Greater near the conductor B
Greater at the large distance from the conductor C
Constant near and away from the conductor D

Question # 24

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

(x) A
(+) B
(.) C
(-) D
(÷)
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

Method "lamp and scale arrangement" used to measure the

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

Question # 27

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

loop A
circle B
bar magnet C
none of these D

Question # 28

The sources of magnetic field are

isolated magnetic poles A
charges at rest B
charges in motion C
none of these D

Question # 29

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 # 30

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

Sr.#	Question	Answer
1	The force experienced by a single charge carrier moving with velocity 'v' i magnetic field of strength 'B' is given by	A. F =q(v/B) B. F=q²(v x B) C. F=q(v x B) D. F= vx B
2	Method "lamp and scale arrangement" used to measure the	A. angle of deflection B. restoring torque C. magnetic field strength D. current
3	In the region surrounding a current carrying wire:	A. A magnetic field is setup B. The lines of force are elliptical C. Direction of lines of forces depends upon direction of current D. Both (A) and (C)
4	Galvanometer is a device used for the detection of	A. voltage B. current C. temperature D. pressure
5	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
6	The magnetic force exerted on an electron moving with velocity 'v' at right angle to the magnetic field is given by	A. F=eVB B. F=e²V/B C. F=e/VB D. F=B²/ev
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 SI unit of magnetic flux is.	A. weber B. Nm^-1A^-1 C. tesla D. gauss
9	The force acting on a charge moving in a magnetic field	A. is perpendicular to the both magnetic field and direction of motion B. is proportional to the magnetic of charges C. vanishes when the motion is directly opposite to the direction of field D. all of the above
10	The permeability of free space is measured in:	A. Wb/Am B. Wb A/m C. Am/Wb D. m/Web A

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