MEDIUM
7th CBSE
IMPORTANT
Earn 100

Briefly explain the construction and working of an electric bell with the help of a labeled diagram.

Important Questions on Electric Current and its Effects

MEDIUM
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 14 - Electric Current and its Effects>Let's revise>Q C
List five uses of electromagnets.
HARD
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 14 - Electric Current and its Effects>Let's revise>Q C
What is meant by magnetic effect of current? With the help of a labelled diagram, demonstrate the magnetic effect of current. Briefly explain Oersted’s experiment.
MEDIUM
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 14 - Electric Current and its Effects>Let's revise>Q C
In which of the figures will the bulb glow and why?
MEDIUM
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 14 - Electric Current and its Effects>Let's revise>Subjective questions
In which of the following circuits will the bulb glow the brightest? Given that all the cells used supply equal current.
MEDIUM
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 14 - Electric Current and its Effects>Let's revise>Subjective questions
Which one of the following is a stronger electromagnet? Why?
EASY
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 14 - Electric Current and its Effects>Let's revise>Subjective questions
Which is the symbol of battery?
EASY
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 14 - Electric Current and its Effects>Let's revise>Subjective questions
_____ works on the heating effect of current.
MEDIUM
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 14 - Electric Current and its Effects>Let's revise>Subjective questions
Read the passage given below:
A long straight coil of wire can be used to generate a magnetic field similar to that of a bar magnet. Such coils are called solenoids, which have enormous practical applications. A solenoid usually contains a movable iron core called armature. When current flows through the wire, it generates a magnetic field around the wire. The magnetic field becomes stronger when the number of turns of wire are also increased. Solenoids are mainly used for on-off applications such as triggering, latching and locking.

Answer the following question by choosing the correct option.
The iron core in a solenoid is called