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Differentiate between the Mendeleev’s periodic table and Modern periodic table
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1
|
885
|
April 5, 2019
|
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Name the electric device that converts mechanical energy into electrical energy
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1
|
1253
|
April 5, 2019
|
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Why is there a need to harness non-conventional sources of energy? Give two main reasons
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1
|
823
|
April 5, 2019
|
|
An object of height 1.2 m is placed before a concave mirror of focal length 20 cm
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1
|
9781
|
April 5, 2019
|
|
An element 'X' has mass number 35 and the number of neutrons, is 18
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1
|
961
|
April 5, 2019
|
|
1. In which direction does he move the lens to focus the flame on the screen?
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1
|
3962
|
April 5, 2019
|
|
Mention the essential material (chemicals) to prepare soap in the laboratory
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1
|
1088
|
April 5, 2019
|
|
In the experimental set up for determination of resistance of a given resistor
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1
|
548
|
April 5, 2019
|
|
A Zinc granule changes the colour of ferrous sulphate and an iron nail changes the blue colour of copper sulphate
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1
|
1475
|
April 5, 2019
|
|
With the help of labelled diagram, discuss the mechanism of respiration in human beings
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1
|
11168
|
April 5, 2019
|
|
Explain the given reactions with the examples: 1. Hydrogenation reaction
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1
|
2422
|
April 5, 2019
|
|
1. How do we classify elements?
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|
1
|
497
|
April 5, 2019
|
|
Give the steps involved in the extraction of metals of low and medium reactivity
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1
|
6666
|
April 5, 2019
|
|
What are the different methods of contraception?
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1
|
4175
|
April 5, 2019
|
|
1. How can you contribute as an individual or make a difference to the management of:
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1
|
1576
|
April 5, 2019
|
|
Energy from various sources is considered to have been derived from the Sun. Do you agree?
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1
|
617
|
April 5, 2019
|
|
What does the direction of thumb indicate in the right-hand thumb rule?
|
|
1
|
1681
|
April 5, 2019
|
|
Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel
|
|
1
|
1858
|
April 5, 2019
|
|
A 14 year old student is not able to see clearly the question’s 1. Name the defect of vision he is suffering from?
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|
1
|
2743
|
April 5, 2019
|
|
Name the four parts labelled as a, b, c and d in given diagram and write their functions
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1
|
2757
|
April 5, 2019
|
|
What are tropic movements? Name the types of tropic movements in plants
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|
1
|
1128
|
April 5, 2019
|
|
What are the differences between the transport of materials in xylem and phloem?
|
|
1
|
5790
|
April 5, 2019
|
|
Using this table, explain why 1. Li and Na are considered as active metals
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|
1
|
5124
|
April 5, 2019
|
|
A substance ‘X’ used in the kitchen for making tasty pakoras and is also an ingredient of antacid
|
|
1
|
6560
|
April 5, 2019
|
|
An old person is unable to see clearly nearby objects. (a) What defect of vision is he suffering from?
|
|
1
|
3658
|
April 5, 2019
|
|
Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor
|
|
1
|
5510
|
April 5, 2019
|
|
An object of height 4.0 cm is placed at a distance of 30 cm form the optical centre
|
|
1
|
8830
|
April 5, 2019
|
|
Draw diagrams of what he observes (in proper squence)
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|
1
|
528
|
April 5, 2019
|
|
List the steps of preparation of temporary mount of a leaf peel to observe stomata
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1
|
5412
|
April 5, 2019
|
|
When a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube?
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|
1
|
1069
|
April 5, 2019
|