List of top Science and Technology Questions

Choose the correct alternative:
Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in .................... .
Name and state the principle used to measure the specific heat capacity of a substance.
What is meant by decomposition reaction? Write the chemical reaction of decomposition of sugar on heating.
Write the molecular formula of chlorine.
Draw the electron dot structure of a chlorine molecule.
Name the type of bond in the formation of chlorine molecule.
Name the defect of eye vision in which the focussing power of eye lens decreases with age.
Write the electronic configuration of chlorine.
Name the capacity of the eye lens to change its focal length as per need.
What is the number of electrons in the valence shell of chlorine?
What is the minimum distance of distinct vision for a normal human eye?
Give two examples in which this process is used.
Name the process shown in the diagram.
The non-metallic substance which is a good conductor of electricity.
How does this process take place?
A sound is produced when certain metals are struck. Name this property of metals.
The two metals which can be cut with knife.
What does a small droplet of water act as?
Name any two natural processes involved in formation of rainbow.
What happens when copper reacts with concentrated nitric acid? What is the colour of the gas released during the reaction?
Write its balanced chemical equation.
Write the names of reactants and products.
The noble gas with the smallest atomic radius.
The atom having smallest atomic mass.
The most electronegative atom.