WorksheetsElectric and it's effects
Total questions: 28
Worksheet time: 15mins
What is used in electric irons, hot plates etc.
Filament
Tungsten
copper
Element
Which is the alloy used in the element
(a)
What is the filament made up of?
(a)
Which of these can be used in electrical wires
Rubber
Copper
Iron
Lead
Solid NaCl
What is this symbol for?
Battery
bulb
electric cell
wire
A fuse wire is a wire of-
High resistivity and low melting point
High resistivity and high melting point
Low resistivity and low melting point
Low resistivity and high melting point
When current is switched 'on' of a bulb it converts _______ energy into _______ energy.
Electrical, heat
Electrical, light
Electrical, mechanical
Electrical, sound
When current is switched on in an electric bell, it converts _______ energy into _______ energy.
Electrical, light
Electrical, sound
Electrical, heat
Mechanical, sound
The magnitude of magnetism produced by an electric current in a wire depends upon- (a) Increases with an increase in the strength of electric current (b) Decreases, as the distance from the wire increases
Both a, b
Only a
Only b
None
A common household device, that do not use an electromagnet in its working, is-
The electric bell
Geyser
Telephone
Loud speaker
The filament of A bulb, is a wire of
High resistivity, low melting point
Low resistivity, low melting point
High resistivity, high melting point
Low resistivity, high melting point
When electric current flows through the metal filament of the bulb it gets heated to very high temperature and becomes______ hot and start emitting _______.
White, light
Red, light
White, heat
Red, heat
When electricity flows through heating coil it becomes ________ hot and gives out _______ energy, which is to put in practical use.
Red, heat
White, heat
Red, light
White, light
If a positive terminal of one cell is connected to the negative terminal of the next cell it is known as
Electric current
Fuse
Battery
Element
When the switch is on the circuit from the positive to negative terminal is complete
True
False
Which of these following cannot be harmed by electric current
Plastic
Rubber
A & B
All of the above
Wires made from some special materials melt quickly and break when a large electric current passes through it.these wires are used to make
Fuses
Electric fuses
A&B
Electromagnet
Who was the first person to notice the deflection of compass needle everytime the current passes through the wire.
Hans Christian Andersen
Hans Christian oersted
Hans Christian mandorson
None of the above
When the current goes off the coil generally loses its magnetism. Such coils are called
(a)
When an electric current flows through the wire it gets heated it is known as the heater
True
False
Electromagnets could be used in particular devices
True
False
The coil of a wire is known as element
True
False
Which of the following cannot be harmed by current
None of the below
Plastic
Rubber
All of the above
(a)
State true or false:
Can 1.5 volt battery be used to make an electromagnet?
True
False
The most suitable material for making the core of an electromagnet is:
Iron
Aluminum
Brass
Steel
A fuse wire is a wire of-
High resistivity and low melting point
High resistivity and high melting point
Low resistivity and low melting point
Low resistivity and high melting point
Connection of more than one device/ appliance to a single socket is called-
Overloading
Short circuit
Both
