Atoms and Molecules — Science STD 9 — Question

Whose living cells provide tensile and mechanical strength?

Waves from sitar wire and veena wire distinguished by (of same frequency):

Cattle husbandry is done for the following purpose.

1. Milk production.
2. Agricultural work.
3. Meat production. 
4. Egg production.

1. (i), (ii) and (iii)
2. (ii), (iii) and (iv)
3. (iii) and (iv)
4. (i) and (iv)

Which of the following path is assumed for the electron in the theory of Rutherford:

What is potential energy?

The number of valence electrons in a graphite atom is:

1. 2
2. 4
3. 3
4. 5

Which of the following statement is wrong:

When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation:

Which one of the following is not an exotic breed of cow?

1. Jersey.
2. Holstein-Friesian.
3. Sahiwal.
4. Brown Swiss.

First living cells were observed by: