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CBSE->Std 10 Questions

Total Questions 2595
define the digestion system of human beings ?
why do we have numbness?
Which is the strongest metal of all metals ?
WHAT ARE THE ADVANTAGES AND DISADVANTAGES OF MULTI-PURPOSE RIVER-VALLEY PROJECTS?
Liquids generally have lower density as compared to solids.But you must have observed that ice floats on water.Find out why.
An object travels for 10 s with uniform acceleration along a straight line path . During this period if the velocity of the object is increased from 5 meter per second to 25 meter per second ,then find the distance traveled by the body ?
Complete the following (a) Zn + CuSO4 = (b) Fe2O3 + Al =
Balance the following equations (a) H2SO4+ NaOH = Na2SO4+H2O (b) Ba(OH)2+ HBr =BaBr2 + H2O (c) KCN + H2SO4 = K2SO4+HCN (d) Al + HCl = AlCl3 + H2O (e) CH4 + O2 = CO2 + H2O
Write balanced equation for the following reactions and identify the type of reaction (a) Zinc Carbonate gives Zinc Oxide plus Carbon dioxide (b) Magnesium plus Hydrochloric acid gives Magnesium Chloride plus Hydrogen (c) Potassium Bromide plus barium Iodide gives Potassium Iodide plus Barium Bromide (d) Hydrogen plus Chlorine gives Hydrogen Chloride
What is exothermic reaction and endothermic reaction? Give examples
What is a balanced chemical equation? Why should chemical equation be balanced?
What is the difference between displacement reaction and double displacement reaction? Write equation for these reactions
Zn+CuSO4=-------------- Fe2O3+Al=------------
What is the chemical equation of Zinc metal reacts with liquid Hydrochloric acid to produce a solution of Zinc chloride and Hydrogen gas
Explain in terms of electrons transfer (a)Oxidation (b) Reduction
Define the pitch of a screw.
What is a unit ?
The least count of a vernier calipers having 20 vernier divisions when 1 M.S.D = 0.1 cm is ____________________ cm
Define vernier calipers.
who found L E D computers ?