English Medium Class 10 - CBSE Question Bank Solutions for Science

If the current passing through a conductor is doubled, what will be the change in heat produced

Which effect of current is utilised in an electric light bulb?

Which effect of current is utilised in the working of an electric fuse?

Name two devices which work on the heating effect of electric current.

State three factors on which the heat produced by an electric current depends. How does it depend on these factors? 

Which effect of current can be utilised in detecting a current carrying wire concealed in a wall? 

Name the scientist who discovered the magnetic effect of current.

Fill in the following blank with suitable words: 

The magnetic effect of a coil can be increased by increasing the number of ........... increasing the ........... or inserting an ........... core.

Fill in the following blank with suitable words:

 If a coil is viewed from one end and the current flows in an anticlockwise direction, then this end is a ........... pole.

Fill in the following blank with suitable words: 

 If a coil is viewed from one end, and the current flows in a clockwise direction, then this end is a ........... pole.

Describe some experiment to show that the magnetic field is associated with an electric current. 

What is Maxwell's corkscrew rule? For what purpose is if used?

If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be:

(a) west pole
(b) south pole
(c) north pole
(d) east pole

The magnetic effect of current was discovered by:

(a) Maxwell
(b) Fleming
(c) Oersted
(d) Faraday

For the coil in the diagram below, when the switch is pressed:

(a) what is the polarity of end A?
(b) which way will the compass point then?    

The direction of current flowing in the coil of an electromagnet at its two ends X and Y are as shown below:  

 What is the polarity of end X?

What is the polarity of end Y?   

Name and state the rule which you have used to determine the polarities. 

Name one device which works on the magnetic effect of current.

 What device reverses the current?

Which way does the wire in the diagram below  tend to move?