Can you suggest some changes in your school which would make it environment-friendly?
Some changes we can make in our school which would make it environmental- friendly. These are following:-
1. Plantation of the trees around the school campus, make loan to sit in the ground that will be more comfortable for the kids as well as the teachers.
2. We should switch off our lights, fans television and energy or light appliances when they are not in use.
3. Putting solar panels on the roof of the school instead of using generator because solar panel generators are silent and have no moving parts. Generators produce high amount of noise that comes from gas or diesel powered machines. Solar panels require less maintenance than generators.
4. By avoiding water waster while we are drinking.
5. By separating degradable or non- biodegradable wastes.
6. There can be more windows for saving the electricity bill or for the natural light consumption.
7. Reusing the paper for writing on both the sides or we can use pencil for the rough work so that we can use the paper for the multiple times.
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When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
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Draw the structure for the following compounds.
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(iii) Butanone (iv) Hexanal.*Are structural isomers possible for bromopentane?
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Calculate the number of electrons constituting one coulomb of charge.
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You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 10.3.
Material
mediumRefractive
indexMaterial
mediumRefractive
indexAir 1.0003 Canada
Balsam1.53 Ice 1.31 Water 1.33 Rock salt 1.54 Alcohol 1.36 Kerosene 1.44 Carbon
disulphide1.63 Fused
quartz1.46 Turpentine
oil1.47 Ruby 1.71 Benzene 1.50 Sapphire 1.77 Crown
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An atom has electronic configuration 2, 8, 7.
(a) What is the atomic number of this element?
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The brain is responsible for
(a) thinking.
(b) regulating the heart beat.
(c) balancing the body.
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Write a balanced chemical equation with state symbols for the following reactions:
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Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?
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- NCERT Chapter