If the stopper if a bottle has stuck, sometimes it may be removed by heating the neck, why ?1 1913
Why does the snow on the mountains not melt all at once, not changed into water very slowly?3 6638
Why does the water in tanks and ponds not freeze in winter ?1 2586
Why metallic tools used by blacksmiths have wooden handles ?1 1887
Why do clothes dry quicker in wind than in still air ?1 2341
Why is clinical thermometer used in preference to and ordinary Fahrenheit thermometer ?1 2358
When we pour into a tumble, bubbles ate seen outside why?1 2101
Why do woolen clothes keep us warm in winter ?29 96210
Why dies the water boil below 100 o C on the top of a mountain ?3 3117
Why does water boil above 100 o C in mines ?2 2747
Why can?t the meat and dal( pulses ) be cooled well on the top of high mountains ?1 2183
When we heat one end of and iron bar, the other end also gets heated up why ?1 2310
The heat of the sun reaches us and the intervening air is not heated up Why ?2 2995
Why is a vessel of water heats more quickly, when heat is applied at the bottom than it is heated at the top?1 2201
Why is the bottom of a kettle blackened and top polished?1 2380
What are filters? Why are they used?
How is measurement of ph made?
How is the accuracy of the method determined?
What is an indicator electrode?
How many millilitre is equal to 1 litre and how many microliter is equal to litre?
Why ph scale range is 14? Why it is not less or not greater than 14? Solution of hcl or hydrogen containing liquid has a ph. But if the solution is kmno4 here nothydrogen power does it ph?
What is the prime constituents of cement?
Explain how buffer works?
How many electrons does benzene have?
What is the reaction that occurring between fas and potassium dichromate?
What is fluidity of a liquid?
What is the min constitutes of haematite ore?
why is acetic acid less conductive than hcl?
What is titration?
Why is acetic acid added?