The Fundamental Unit of Life — Science STD 9 — Question

The subatomic particle called electron was discovered by:

1. J.J. Thomson
2. Neils Bohr
3. James Chadwick
4. D. E. Goldstein

Which one of the following is not a chemical change?

1. Formation of curd.
2. Ripening of banana..
3. Sublimation of naphthalene.
4. Corrosion of photo frame.

While running you possess certain kind of energy due to motion .What kind of energy do you possess?

Husk of coconut is made of:

The number of electrons in the outermost shell in the atom of an inert element is:

A boy of mass 50kg standing on ground exerts a force of 500N on the ground. The force exerted by the ground on the boy will be:

1. 50N
2. 25000N
3. 10N
4. 500N

In a meeting hall which is initially half-filled with participants, and after some time becomes full in capacity, then the clarity of speech:

Cell was discovered by:

Which one of the following statements related to the process of evaporation is incorrect?

 A change in the physical state can be brought about: