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With the help of an activity explain the making of an electromagnet
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0
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2051
|
March 23, 2018
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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
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0
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2406
|
March 23, 2018
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In the circuit shown below
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0
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687
|
March 23, 2018
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Describe a simple experiment to show that the bulb lights up when an electric circuit is complete and vice-versa
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0
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2787
|
March 23, 2018
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How does the magnetic effect of electric current help in the working of an electric bell? Explain with the help of a diagram
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0
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7159
|
March 23, 2018
|
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Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness
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0
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7394
|
March 23, 2018
|
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When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain
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0
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4547
|
March 23, 2018
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How do short circuits occur?
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0
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572
|
March 23, 2018
|
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Write four uses of electromagnets
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0
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640
|
March 23, 2018
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On what factors does the strength of an electromagnet depend?
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0
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2171
|
March 23, 2018
|
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On what factors does the heat produced in a wire depend?
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0
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5447
|
March 23, 2018
|
|
What are electric fuses? Why are they important?
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0
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1208
|
March 23, 2018
|
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Will the compass needle show deflection when the switch in the circuit shown by figure given below is closed?
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0
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1498
|
March 23, 2018
|
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Name any two effects of electric current
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0
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756
|
March 23, 2018
|
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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
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0
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2304
|
March 23, 2018
|
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Draw the circuit diagram to represent the circuit shown below
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0
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3431
|
March 23, 2018
|
|
Draw in your notebook the symbols to represent the following components of electrical
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0
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10563
|
March 23, 2018
|
|
Boojho made an electromagnet by winding 50 turns of wire over an iron screw
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0
|
3816
|
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?
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0
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1614
|
March 23, 2018
|
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Name two electric devices for each where heating effect of current is used and magnetic effect of current is used
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0
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5188
|
March 23, 2018
|
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Can we use the same fuse in a geyser and a television set? Explain
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0
|
1943
|
March 23, 2018
|
|
With the help of Newton’s disc, prove that seven colours of the rainbow can be recombined and produce white light
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0
|
1314
|
March 23, 2018
|
|
Explain the reflection of light on white paper screen with the help of an activity
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0
|
3097
|
March 23, 2018
|
|
Distinguish between the following. Real image and Virtual image ,Convergent beam and Divergent beam
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0
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1747
|
March 23, 2018
|
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You are given three mirrors of different types. How will you identify each one of them?
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0
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5469
|
March 23, 2018
|
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What is rectilinear propagation of light? How will you prove it?
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0
|
2509
|
March 23, 2018
|
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What is regular and irregular reflection?
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0
|
4526
|
March 23, 2018
|
|
Suppose we wish to obtain the real image of a distant tree
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0
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1758
|
March 23, 2018
|
|
It was observed that when the distance between an object and a lens decreases
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0
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1784
|
March 23, 2018
|
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Why should you not look at the sun through a convex lens?
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0
|
1980
|
March 23, 2018
|