Physics
Grade-7
Easy
Question
Coils of heating devices are made up of
- Nichrome
- Tungsten
- Mercury
- Copper
Hint:
Nichrome
The correct answer is: Nichrome
Heating coils are made of nichrome. It is an alloy of Nickel, chromium and iron.
Nichrome is used for making heating element of electrical appliances because nichrome does not oxidize and burn easily at high temperature, that is it has higher melting point and boiling point than metals. Thus, it does not melt even when a large amount of heat is produced due to passage of current.
Related Questions to study
Physics
The heating effect of electric current is used in
The heating effect of electric current is used in
PhysicsGrade-7
Physics
A fuse wire is made up of alloy
A fuse wire is made up of alloy
PhysicsGrade-7
Physics
How many bulbs are there in the given circuit diagram?
How many bulbs are there in the given circuit diagram?
PhysicsGrade-7
Physics
How many resisters are there in the given circuit diagram?
How many resisters are there in the given circuit diagram?
PhysicsGrade-7
Physics
Nichrome is used as a coil of heater because
Nichrome is used as a coil of heater because
PhysicsGrade-7
Physics
To make a battery of two cells
To make a battery of two cells
PhysicsGrade-7
Physics
Which one of the following devices is based on the heating effect of electric current?
Which one of the following devices is based on the heating effect of electric current?
PhysicsGrade-7
Physics
Key or switch in the circuit is placed
Key or switch in the circuit is placed
PhysicsGrade-7
Physics
Which one of the following devices is not based on the heating effect of electric current?
Which one of the following devices is not based on the heating effect of electric current?
PhysicsGrade-7
Physics
Why are symbols used for electric components?
Why are symbols used for electric components?
PhysicsGrade-7
Physics
Electric voltage is measured by a device
Electric voltage is measured by a device
PhysicsGrade-7
Physics
When two or more cells are joined together, it forms a
When two or more cells are joined together, it forms a
PhysicsGrade-7
Physics
When excess current flows through the wire, it shows
When excess current flows through the wire, it shows
PhysicsGrade-7
Physics
The presence of current in a circuit is detected using a __________.
The presence of current in a circuit is detected using a __________.
PhysicsGrade-7
Physics
Which one of the following is a safety device?
Which one of the following is a safety device?
PhysicsGrade-7
