ECAT Pre Computer Science Chapter 14 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 14 Electromagnetism

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ECAT Physics Chapter 14 Electromagnetism

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Question # 1

Current is measured in

Question # 2

The SI unit of magnetic induction is

Question # 3

The pointer of a magnetic compass:

Question # 4

To convert galvanometer into ammeter we connect

Question # 5

A current carrying conductor sets up its own:

Question # 6

When the charged particle is projected at right angles to the field, then experienced by it will be:

Question # 7

Charge to mass ratio (e/m) of an electron is given by the relation

Question # 8

For the conversion of galvanometer into voltmeter, we connect a

Question # 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

Question # 10

Galvanometer is a device used for the detection of

Question # 11

The force acting on a charge moving in a magnetic field

Question # 12

The force exerted on a conductor of length L, carrying current I when placed in a magnetic field B is given by

Question # 13

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

Question # 14

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

Question # 15

Magnetic lines of force:

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Sr.# Question Answer
1 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
2 A full-scale deflection is obtained in a galvanometer with a current of few
A. ampere
B. volts
C. milliampere
D. ohm
3 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
4 (CRO) Cathode ray oscilloscope is a device used for high speed
A. velocity
B. graph plotting
C. time-velocity
D. none of these
5 It is customary represent a current flowing towards the reader by a symbol
A. (x)
B. (+)
C. (.)
D. (-)
6 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
A. dead beat galvanometer
B. stable galvanometer
C. shunt galvanometer
D. sensitive galvanomter
7 A field is uniform and much stronger:
A.

Inside a long solenoid

B.

Outside a long solenoid

C.

At the end of a long solenoid

D.

At the central point of long solenoid
8 The SI unit of flux density is.
A. Tesla
B. Weber
C. Gaun
D. Weber/meter
9 Magnetic flux passing through the an element of are A placed perpendicular to a uniform magnetic field Bis:
A. Maximum
B. Minimum
C. Zero
D. Very small
10 The torque per unit twist of coil is called
A. proportionality constant
B. gravitational constant
C. boltzman constant
D. coupling constant
11 The current is measured in
A. volts
B. watt
C. ampere
D. ohm
12 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)
13 The direction of lines of force depends upon the direction of
A. voltage
B. current
C. charges
D. none of these
14 Flurescent screen is a screen where visible spot
A. vanishes
B. is made
C. becomes small and large
D. none of these
15 The sources of magnetic field are
A. isolated magnetic poles
B. charges at rest
C. charges in motion
D. none of these

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