Physics
what is the SI unit of force?
Newton
What is the symbol of Helium
He
a
a
What is the acceleration of a a moving body if its velocity changes by 20 m/s in 1o second time?
2 m/s2
What is the number of electrons in the outermost orbit of an atom of Chlorine?
7
b
b
What is the difference between the weightlessness during freefall and weightlessness in space?
during freefall it is the apparent weightlessness where as in space it is true weightlessness.
Why is the symbol of mercury Hg?
It is from its Latin name Hydrargyrum.
c
c
What are the laws of reflection of light?
the laws are:
incident ray, reflected ray and normal lie on the same plane.
angle of incident is equal to angle of reflection.
What is the Modern periodic law?
The physical and chemical properties of the elements are the periodic functions of their atomic number.
d
d
what is the power of a man if he stands with a sack of 100 kg of rice for two hours?
zero
What are the elements of group VII called as?
Halogens.
e
e