Question
Which electricity generation process is ecofriendly and which is not?
✓
Answer
Among all the electricity generation processes wind mill and solar thermal plant are eco-friendly while thermal and nuclear power generation is not eco-friendly.
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Take a battery, (12V) a variable resistance (or a rheostat), an ammeter (0_5 A), a plug key, needle and a long straight thick copper wire. Take a rectangular cardboard, pass this wire through center. Fix the cardboard and see that it does not slide up or down. Sprinkle iron filings uniformly on the cardboard. Close the key and tap the cardboard gently.
(i) Observe the pattern of iron filings.
(ii) What changes are seen in the magnetic field lines?
(iii) What happens to the magnetic needle of the compass when the compass is brought near the wire, and moved away from the wire? Also observe what happens to the magnetic needle when strength of current is increased.
(iv) What happens to the magnetic needle of the compass when direction of the current is reversed in the straight conductor? State the reasons for your observation.
(i) Observe the pattern of iron filings.
(ii) What changes are seen in the magnetic field lines?
(iii) What happens to the magnetic needle of the compass when the compass is brought near the wire, and moved away from the wire? Also observe what happens to the magnetic needle when strength of current is increased.
(iv) What happens to the magnetic needle of the compass when direction of the current is reversed in the straight conductor? State the reasons for your observation.
What is the difference between a reflex action and walking?
What physical and chemical properties of elements did Mendeleev consider in compiling the periodic table?
Acidified potassium permanganate $\left( KMnO _4\right)$ is a chemical oxidant and explain, how acidified potassium permanganate oxidise ferrous sulphate $\left( FeSO _4\right)$. Accordingly write a new definition of oxidation and reduction.
→Hydrochloric acid reacts with a metal $X$ to form a gas $Y$ which bums with a ‘pop’ sound. Sodium hydroxide solution also reacts with the same metal $X ($on heating$)$ to form the same gas $Y.$
→- Name $X$ and $Y.$
- Write the chemical equation of the reaction of metal $X$ with.
- Hydrochloric acid, and
- Sodium hydroxide solution.
Here are some results of solutions tested with universal indicator paper:
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- Metal polish: Dark blue
- Washing-up liquid:
- Yellow Milk of magnesia:
- Light blue Oven cleaner:
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Calculate the amount of heat required to convert $10\ g$ of water at $30\ ^\circ C$ into steam at $100\ ^\circ C. ($Specific latent heat of vaporization of water $= 540\ cal/g)$
→Draw a neat labelled diagram.Orbits of satellites:
Consider the following elements:
Ca, Cl, Na, I, Li, Ba, Sr, K, Br.
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
Ca, Cl, Na, I, Li, Ba, Sr, K, Br.
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
Identify the physical and chemical changes from the following phenomena:
i. Transformation of ice into water.
ii. Ripening of fruit.
iii. Milk turned into curd.
iv. Evaporation of water.
v. Digestion of food in the stomach.
vi. Iron filings get attracted towards the magnet.
i. Transformation of ice into water.
ii. Ripening of fruit.
iii. Milk turned into curd.
iv. Evaporation of water.
v. Digestion of food in the stomach.
vi. Iron filings get attracted towards the magnet.