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Explain the reflection of light on white paper screen with the help of an activity
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0
|
3100
|
March 23, 2018
|
|
Distinguish between the following. Real image and Virtual image ,Convergent beam and Divergent beam
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0
|
1755
|
March 23, 2018
|
|
Explain the following: Lime water turns milky on passing carbon dioxide gas into it. Bubbles are produced when acetic acid is added to a solution of sodium hydrogencarbonate
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0
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3719
|
March 23, 2018
|
|
Classify the changes involved in the following processes as physical or chemical changes: Photosynthesis Dissolving sugar in water Burning of coal Melting of wax
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0
|
604
|
March 23, 2018
|
|
You are given three mirrors of different types. How will you identify each one of them?
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0
|
5485
|
March 23, 2018
|
|
What is rectilinear propagation of light? How will you prove it?
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0
|
2513
|
March 23, 2018
|
|
What is regular and irregular reflection?
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0
|
4530
|
March 23, 2018
|
|
Classify the following processes into physical or chemical changes: Beating of aluminium metal to make aluminium foil. Digestion of food. Cutting of a log of wood into pieces. Burning of crackers
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0
|
3529
|
March 23, 2018
|
|
Suppose we wish to obtain the real image of a distant tree
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|
0
|
1764
|
March 23, 2018
|
|
It was observed that when the distance between an object and a lens decreases
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0
|
1793
|
March 23, 2018
|
|
Why should you not look at the sun through a convex lens?
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|
0
|
1993
|
March 23, 2018
|
|
What is a Newton’s disc?
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|
0
|
1106
|
March 23, 2018
|
|
State the characteristics of the image formed by a plane mirror
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0
|
999
|
March 23, 2018
|
|
What is lateral inversion?
|
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0
|
5177
|
March 23, 2018
|
|
Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution
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0
|
12872
|
March 23, 2018
|
|
Give one use each of a concave and a convex mirror
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|
0
|
4677
|
March 23, 2018
|
|
State two differences between a convex and a concave lens
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0
|
8614
|
March 23, 2018
|
|
Give two uses of the following acids. Nitric acid Hydrochloric acid Sulphuric acid
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|
0
|
710
|
March 23, 2018
|
|
What is a virtual image? Give one situation where a virtual image is formed
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|
0
|
1938
|
March 23, 2018
|
|
A shopkeeper wanted to fix a mirror which will give a maximum view of his shop
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|
0
|
2307
|
March 23, 2018
|
|
Explain two neutralisation reactions related to daily life situation
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0
|
8251
|
March 23, 2018
|
|
Two different type of lenses are placed on a sheet of newspaper
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|
0
|
2914
|
March 23, 2018
|
|
Paheli observed that most of the fish in the pond of her village were gradually dying
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|
0
|
6078
|
March 23, 2018
|
|
An erect and enlarged image of an object is formed on a screen. Explain how this could be possible. [NCERT Exemplar] The image formed on the screen could be enlarged and erect if the object is placed upside down between F and 2F of the lens
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0
|
679
|
March 23, 2018
|
|
State the correct sequence (1-7) of colours in the spectrum formed by the prisms A and B, shown in figure
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0
|
2332
|
March 23, 2018
|
|
You are provided with three test tubes A, B and C as shown in figure with different liquids
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|
0
|
2767
|
March 23, 2018
|
|
Boojho made light from a laser torch to fall on a prism. Will he be able to observe a band of seven colours? Explain with a reason
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|
0
|
1888
|
March 23, 2018
|
|
Observe the figures given below carefully
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|
0
|
1319
|
March 23, 2018
|
|
You are provided with four test tubes containing sugar solution, baking soda solution, tamarind solution, salt solution
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|
0
|
2845
|
March 23, 2018
|
|
What type of mirror is used as a side mirror in a scooter?
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|
0
|
1045
|
March 23, 2018
|