What changes would you suggest in your home in order to be environment-friendly?
Environment- friendly consciousness is not only about the plastic bags, we have to be more conscious about the pollution control, wildlife protection and conservation, conservation of natural resources and some other actions which helps in reducing the stress conditions of the environment and all this depends on our everyday choices we make. Some changes that can be done in our homes to be environment- friendly:-
1. By saving electricity:- we should switch off our lights, fans television and energy or light appliances when they are not in use.
2. By using solar panels:- Solar panel is designed to absorb the sun’s rays as the source of the energy for generating electricity. We should use solar panels instead of generators or invertors. Almost 28- 35 solar panels are used to power a house but it also depends on the roof size, location or the number of appliances being charged by the solar panels.
3. Separation of biodegradable and non- biodegradable waste:- we should separate the biodegradable or non-biodegradable waste. Biodegradable means which can be decomposed easily like dry waste (peels of vegetables that can be used for making the fertilizer for improving the soil fertility). And, non- biodegradable is which can’t be decomposed easily like polythene, electronic waste which affects the environment.
4. By saving water:- Tap should be off while we are brushing our teeth or shaving, we should not waste the water of aquaguard as the water we consume from aqua guard, it releases the maximum amount of water than the water we are using. Approximately RO purifiers waste approx. 3 litres of water for every 1 litre of purified water. So, we should use this waste water for the plantation, for animals, for birds etc. or we can also use this waste water in mopping the floor.
5. By using these five phenomena reuse, reduce, repurpose, refuse or recycle in the kitchen appliances or in home.
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.
Outline a project which aims to find the dominant coat colour in dogs.
Draw the structure for the following compounds.
(i) Ethanoic acid (ii) Bromopentane*
(iii) Butanone (iv) Hexanal.
*Are structural isomers possible for bromopentane?
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?
How is the sex of the child determined in human beings?
(a) What property do all elements in the same column of the Periodic Table as boron have in common?
(b) What property do all elements in the same column of the Periodic Table as fluorine have in common?
Calculate the number of electrons constituting one coulomb of charge.
What is an homologous series? Explain with an example.
Why is variation beneficial to the species but not necessarily for the individual?
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
How is the sex of the child determined in human beings?
What are plant hormones?
Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be –
(a) 1:2 (b) 2:1 (c) 1:4 (d) 4:1
Which of the following constitute a food-chain?
(a) Grass, wheat and mango
(b) Grass, goat and human
(c) Goat, cow and elephant
(d) Grass, fish and goat
Name
(a) three elements that have a single electron in their outermost shells.
(b) two elements that have two electrons in their outermost shells.
(c) three elements with filled outermost shells.
Why do we prefer a convex mirror as a rear-view mirror in vehicles?
What are outside raw materials used for by an organism?
Which of the following terms does not represent electrical power in a circuit?
(a) I2R (b) IR2 (c) VI (d) V2/R
State the principle of an electric generator.