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Subject: Science, asked on 17/9/13

metal oxide + acids = salt + water give an example

Subject: Science, asked on 13/12/14

the magnification of a mirror is +2/3. What type of mirror is it?

Subject: Science, asked on 1/3/16

a red light and blue light enter a rectangular glass slab block normal to its surface at the same time.strictly speaking,after passing through the block ,which pulse exits first?

Subject: Science, asked on 9/5/15

Balance:-
  • Chlorine reacts with oxygen to form chlorine heptoxide
  • Carbon reacts with oxygen to give Carbon monoxide
  • Nitrogen reacts with oxygen to give Nitrogen monoxide
  • Hydrogen burns in presence of air to form water
  • Magnesium burns in presence of nitrogen to form Magnesium Nitride

Subject: Science, asked on 25/6/15


~Q. Take 1 ml starch solution (1%) in two test tubes A and B. Add 1 ml of saliva to test tube a and leave both the test tubes undisturbed for 15 min. Now, add a few drops of iodine solution to the test tubes.
a) In which of the test tube, do you observe a colour change?
b) What does this indicate about the presence or absence of starch in both the test tubes?
c) Conclude about the action of saliva on starch.

Subject: Science, asked on 18/4/14

write an activity to show the change in the state of matter and change in temperature during a chemical reaction

Subject: Science, asked on 27/3/14

What does a dot in a chemical formula mean? eg CuSO4.5H2O. Does it mean that the one molecule ofCuSO4is attached to five molecules ofH2O??? pls expalin with help of diagram...

Subject: Science, asked on 14/1/14

which of the following is a redox reaction -

a) CaCO3 - CaO + CO2

b) H2 + Cl2 - 2HCl

c) CaO + 2HCl - CaCl2 + H2O

d) NaOH + HCl - NaCl + H2O

Subject: Science, asked on 28/4/14

Give the appropriate terms to the following statements:

a) any substance taken into the body for purpose of providing nutrition.

b) conversion of complex food particles into simpler food particles in presence of enzymes

Subject: Science, asked on 26/6/20

a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.
53. Assertion: AgBr is used on photographic and x-ray film.
Reason: AgBr is photosensitive and changes to Ag and bromine in presence of sunlight and undergoes decomposition reaction.

Subject: Science, asked on 16/3/13

An object moves a distance 'f' between 2f and f of a concave mirror. The image would have travelled a distance of :

(a) f , (b) 2f, (c) f/2, (d) infinity ??

Subject: Science, asked on 4/12/19

CaCl2 is acidic basic or neutral .Give reason

Subject: Science, asked on 11/3/17


Q. Which of the three media A, B, C has maximum optical density
Q. Through which of the three media will speed of light maximum?
Q. Will light travel from A to B bend towards pa away from the normal?
 

Subject: Science, asked on 5/9/13

What is the purpose of sending blood to the kidneys for filtration?

Subject: Science, asked on 22/11/19

In the adjacent circuit the voltages across AD , BD and CD are 2volts,6volts and 8 volts respectively ....if resistance RA is 1 kilo ohm then find RB and RC

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