Bell metal is an alloy of
1 Brass an nickel
2 Zinc and copper
3 Tin and copper
4 None of these
Which of the following metals was first discovered by man? 1 Bronze 2 Silver 3 Iron 4 Copper
In which year, physical laboratory in ahmedabad was founded?
which of the following fibers is generally preferred for making gauze and lint? 1 Cotton 2 Rayon 3 Nylon 4 Terylene
A mixture of salt and sand can be separated by 1 Sublimation 2 Dissolving in water 3 Gravity separation 4 Dry distillation
why we are not measure the turbidity in mg/lit?
The neutral atom’s two isotopes differ in the number of 1 Electron shells 2 Protons 3 Valence electrons 4 Neutrons
Why is it necessary to cook food ?
why is it important that sex cells have half the number of Chromosomes as body cells?
how is electricity converted from the potential energy of water falling from dams?
Amalgams are 1 Alloys which contain carbon 2 Alloys which have great resistance to abrasion 3 Alloys which contain mercury as one of the contents 4 None of these
In which of the following processes light energy is converted into chemical energy? 1 Respiration 2 Fermentation 3 Photosynthesis 4 Photoresiration
what is center of gravity?