List of practice Questions

Tooth decay begins when the pH of the mouth drops below:
What is the product formed when slaked lime reacts with carbon dioxide during whitewashing?
Why does the iron nail become brownish when dipped in copper sulfate solution?
What causes corrosion of iron?
What makes graphite a good conductor of electricity?
What property allows carbon to form large molecules by bonding with itself?
Compounds with the same molecular formula but different structures are called
Which series contains compounds differing by a $ -CH_2 - $ unit?
Which functional group is present in carboxylic acids?
Which substance can oxidize ethanol to ethanoic acid?
What is the process of forming a thick oxide layer on aluminium called?
What happens when zinc is added to a solution of iron (II) sulfate?
What type of bond is formed when a metal transfers electrons to a non-metal?
What is the name of the process where carbonate ores are converted to oxides by heating in limited air?
Which of the following is an ore of mercury?
What kind of bond exists in a molecule of nitrogen ($N_2$)?
Why are cooking vessels made up of metals like copper and aluminium?
Why are metals like potassium and sodium stored in kerosene oil?
The delicate membrane having enormous number of light sensitive cells is:
The amount of light entering the eye is regulated and controlled by the
The minimum distance at which the objects can be seen most distinctly without strain is called
An object placed between the principal focus and center of curvature of a convex lens forms an image:
The power of a lens is $ 4 \, D $. Its focal length is
If the height of the image is equal to the height of an object placed near a spherical lens, then the magnification $ m $ is
An object is placed at a distance of $ 30 \, cm $ from a concave lens of focal length $ 20 \, cm $. The image distance is: