Electricity and Magnetism - II Online Test

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Electricity and Magnetism - II

Description: Electricity and Magnetism - II
Number of Questions: 20
Created by: Neema Pandya
Tags: Electricity and Magnetism - II Electricity

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Good conductors have many loosely bound

atoms
molecules
protons
electrons

The net e.m.f. of a normal dry cell is

2 volt
1 volt
1.5 volt
3.0 volt

The simplest way of maintaining a potential difference between the two ends of a conductor is

to connect it to a battery or dry cell
to bring the two ends of conductor near each other
to mark the two ends of conductor away from each other
none of these

In a simple voltaic cell, the negative electrode is of

zinc
copper
carbon
silver

Coating of iron with zinc is known as

galvanization
electroplating
ionization
none of these

Tungsten is mainly used for making filaments of electric bulbs because of its

low cost
high melting point
high electrical conductivity
low thermal conductivity

Ampere-second stands for the unit of

power
energy
e.m.f.
electric charge

Chemical identity of an atom can be changed by

changing the number of protons in an atom's nucleus
changing the number of neutrons in an atom's nucleus
changing the number of neutrons and protons in an atom's nucleus
chemical identity cannot be changed

For the movement of electrons between two points, there must be a

temperature difference between two points
potential difference between two points
both points must be at the same potential
electrons can even flow without any temperature and potential difference between two points

When a current flowing through a resistance increases four times, the heat developed will increase

two times
four times
eight times
sixteen times

Voltage can be generated

by rubbing certain types of materials against each other
by means of chemical reactions
by influence of magnetism on conductors
all of these

The property of a material, when it opposes or limits the flow of electric current through it is called

potential difference
electric resistance
conductivity
power

Fuse wire is made up of

63% tin and 37% lead
63% lead and 37% tin
63% tin and 37% aluminium
63% lead and 37% aluminium

How many 100 watt bulbs may be safely used on 220 volt with five amperes fuse?

One should not connect a number of electric appliances to the same power sockets because

this can damage the appliances
this can damage the domestic wiring due to over-heating
the appliances will not get full voltage
the appliances will not get proper current

You are given three bulbs of 25, 40 and 60 watt all operating at 220 V. Which of the three bulbs has the lowest resistance?

60 watt bulb
40 watt bulb
25 watt bulb
Data insufficient

Current always flows from

high potential to low potential
low potential to high potential
both of the above
none of these

If a magnet is cut into two pieces of equal length,

both pieces will lose their magnetism
one piece will act as north pole and the other as south pole
both pieces will behave as complete magnets
one of the pieces will lose its magnetism

Find out the correct statement.

A freely suspended bar magnet points north.
A freely suspended bar magnet is constantly oscillating.
A freely suspended bar magnet always points east.
A freely suspended bar magnet will set itself at an angle to the horizontal.

When a bar magnet is immersed in a heap of iron fillings and is then taken out, it is observed that iron fillings stick to the surface of the bar magnet. The iron fillings would be observed to

stick uniformly throughout the surface of the bar magnet
stick randomly on the surface of bar magnet
have maximum concentration at the two ends of the bar magnet
have maximum concentration slightly away from the two ends of the bar magnet

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Electricity and Magnetism - II

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