1. Why two similar charges repel each other? ...
Foreign
Section - A
1. Give an example of a reaction catalysed by an enzyme. ...
All India
Section - A
1. How is the rate of reaction influenced by
(i) raising the temperature of reactants ?
(ii) adding to the reacting mixture a product of reaction without change in volume ? ...
Delhi
Section - A
1. Draw a figure to show how the rate of a chemical reaction in general changes as the temperature of reactants is increased step-wise. ...
Section - A
1. What is the contribution of Edwin Hubble to space science ? ...
Section - A
1. What is the wavelength range of visible light ? ...
Section - A
1. Write the full form of the following :
(i)ASLV,(ii)ISRO. ...
Section – A
1. What is the density of mass of a typical white dwarf star ? ...
Section - A
1. Name any two non-renewable sources of energy. ...
Section - A
1. What is meant by endothermic process ? Give one example. ...
Section - A
1. Relate the incident and emergent angle of light in a glass slab. ...
Section - A
1. The refractive index of water and glass are 1.33 and 1.5 respectively. Find the refractive index of water with respect to glass. ...
Section - A
1. Write the nature of image formed by a plane mirror. ...
Section - A
1. Relate refractive index with the speed of light in the medium, ...
Section - A
1. Name the largest component of biogas, ...
Section - A
1. Name the mirror which always forms a virtual image ? ...
Section - A
1. Name one gaseous fossil fuel.
Answer :
2. Complete the path of ray of light after reflection at the mirror in the given diagram ;
Answer :
3. Express one light year in terms oi' SI unit of distance.
Answer :
4. ...
Section - A
1. What is the effect of an increase in temperature on the rate of a chemical reaction ?
Answer :
2. Name any two isotopes which ...
1. The reaction of a metal 'X' with Fe2 O3 is highly exothermic and is used to join railway tracks. Identify the metal 'X' and write the chemical equation of its reaction with Fe2 O3. ...
1. What is the chemical name of baking soda? Write its formula.
Answer :
2. The pH values of equimolar ...