|
With the help of an activity explain the making of an electromagnet
|
|
0
|
1962
|
March 23, 2018
|
|
The bulb in the circuit shown in figure below does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow
|
|
0
|
2312
|
March 23, 2018
|
|
In the circuit shown below
|
|
0
|
644
|
March 23, 2018
|
|
Describe a simple experiment to show that the bulb lights up when an electric circuit is complete and vice-versa
|
|
0
|
2593
|
March 23, 2018
|
|
How does the magnetic effect of electric current help in the working of an electric bell? Explain with the help of a diagram
|
|
0
|
6976
|
March 23, 2018
|
|
Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness
|
|
0
|
6991
|
March 23, 2018
|
|
When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain
|
|
0
|
4466
|
March 23, 2018
|
|
How do short circuits occur?
|
|
0
|
527
|
March 23, 2018
|
|
Write four uses of electromagnets
|
|
0
|
599
|
March 23, 2018
|
|
On what factors does the strength of an electromagnet depend?
|
|
0
|
2071
|
March 23, 2018
|
|
On what factors does the heat produced in a wire depend?
|
|
0
|
5380
|
March 23, 2018
|
|
What are electric fuses? Why are they important?
|
|
0
|
1158
|
March 23, 2018
|
|
Will the compass needle show deflection when the switch in the circuit shown by figure given below is closed?
|
|
0
|
1427
|
March 23, 2018
|
|
Name any two effects of electric current
|
|
0
|
704
|
March 23, 2018
|
|
The figure below shows four cells fixed on a board. Draw lines to indicate how you will connect their terminals with wires to make a battery of four cells
|
|
0
|
2209
|
March 23, 2018
|
|
Draw the circuit diagram to represent the circuit shown below
|
|
0
|
3283
|
March 23, 2018
|
|
Draw in your notebook the symbols to represent the following components of electrical
|
|
0
|
9974
|
March 23, 2018
|
|
Boojho made an electromagnet by winding 50 turns of wire over an iron screw
|
|
0
|
3749
|
March 23, 2018
|
|
Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?
|
|
0
|
1559
|
March 23, 2018
|
|
Name two electric devices for each where heating effect of current is used and magnetic effect of current is used
|
|
0
|
5128
|
March 23, 2018
|
|
Can we use the same fuse in a geyser and a television set? Explain
|
|
0
|
1855
|
March 23, 2018
|
|
With the help of Newton’s disc, prove that seven colours of the rainbow can be recombined and produce white light
|
|
0
|
1265
|
March 23, 2018
|
|
Explain the reflection of light on white paper screen with the help of an activity
|
|
0
|
2818
|
March 23, 2018
|
|
Distinguish between the following. Real image and Virtual image ,Convergent beam and Divergent beam
|
|
0
|
1626
|
March 23, 2018
|
|
You are given three mirrors of different types. How will you identify each one of them?
|
|
0
|
5336
|
March 23, 2018
|
|
What is rectilinear propagation of light? How will you prove it?
|
|
0
|
2421
|
March 23, 2018
|
|
What is regular and irregular reflection?
|
|
0
|
4455
|
March 23, 2018
|
|
Suppose we wish to obtain the real image of a distant tree
|
|
0
|
1703
|
March 23, 2018
|
|
It was observed that when the distance between an object and a lens decreases
|
|
0
|
1702
|
March 23, 2018
|
|
Why should you not look at the sun through a convex lens?
|
|
0
|
1813
|
March 23, 2018
|