List of top Science and Technology Questions

The geostationary satellites are not useful for studies of polar regions.
Distinguish between oxidation and reduction.
Give the molecular formula and structural formula of Benzene.
Match the pairs: [h!] |l|l| Group 'A' & Group 'B'
Thermometer & (a) Mechanical energy
& (b) To measure temperature
& (c) To measure electric current
By observing the correlation in the first pair, complete the second pair: Mass : Kilogram : : Weight : ?
What is the wavelength of violet ray in dispersion of light?
For normal human eye, the minimum distance of distinct vision is ..................
State whether the following statement is true or false:
The volume of water at 4°C is maximum.
In _ _ _ _ _ _ of the modern periodic table, are the non-metals found.
The refractive index of diamond is ..................
The resistance of the wire is 100 Ω. If it is carrying a current of 1 A for 10 seconds, the heat produced will be _ _ _ _ _ _ .
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.
Name the type of bond in the formation of chlorine molecule.
Draw the electron dot structure of a chlorine molecule.
Write the molecular formula of chlorine.
What is the number of electrons in the valence shell of chlorine?
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.
Give two examples in which this process is used.
What is the minimum distance of distinct vision for a normal human eye?
The non-metallic substance which is a good conductor of electricity.
Name the process shown in the diagram.