List of top Science Questions

When electric current flows through a conducting wire, what type of magnetic field is generated above and below the wire ?

In Fleming's left-hand rule, the index finger of the left hand indicates

What is the function of the villi located in small intestine ?

Bile juice is secreted by

Which gas is responsible for global warming?

What type of energy source is hydroelectric energy ?

A horizontal magnet hanging freely in air always comes to rest in

If a compass is placed near a wire carrying electric current, the compass needle

Faraday made many revolutionary discoveries, including

An electric motor converts

In which of the following reactions is a combination reaction taking place?
I. CuO + H$_2$ $\xrightarrow{\Delta}$ Cu + H$_2$O
II. ZnO + C → Zn + CO
III. 4Na + O$_2$ → 2Na$_2$O
IV. CH$_4$ + 2O$_2$ → CO$_2$ + 2H$_2$O

Name a metal found in the earth's crust:
(i) in free state and
(ii) in the form of its compound.
State where each of these metals are placed in the reactivity series of metals

Write short notes on: (i) Reflex action
(ii) Lymph

(i) Food chain
(ii) Growth hormone in human.

(i) Write the applications of the following inorganic compounds:
(a) Plaster of Paris
(b) Bleaching Powder
(c) Sodium Bicarbonate

(i) What happens when (write chemical equation only):
\begin{enumerate} \item Plaster of Paris reacts with water? \item \(\text{NH}_3 (g)\) and \(\text{CO}_2 (g)\) are passed in the solution of saturated aqueous solution of NaCl? \item \(\text{Ca(OH)}_2\) (dry) reacts with \(\text{Cl}_2\) (g) (dry)? \end{enumerate}

(ii) What happens when (write chemical equation only):
\begin{enumerate} \item Ethanol is heated with \(\text{K}_2\text{Cr}_2\text{O}_7\) and concentrated sulphuric acid? \item Ethyl alcohol is heated with glacial acetic acid in presence of conc. \(\text{H}_2\text{SO}_4\)? \item Acetic acid reacts with sodium bicarbonate? \end{enumerate}