Motion — Science STD 9 — Question

Four elements W, X, Y and Z contain 8, 11, 9 and 17 protons per atom respectively. The element which cannot form an anion is most likely to be:

The force of attraction between two unit point masses separated by a unit distance is called:

Name the cell organelle which is called the Control room of the cell.

If the velocity of a body does not change, its acceleration is:

What is the role of middle ear?

Lysosomes are made up of:

The kinetic energy is proportional to temperature, thus evaporation:

In water, the proportion of oxygen and hydrogen by mass is:

1. 1 : 4
2. 1 : 8
3. 4 : 1
4. 8 : 1

The inter-particle attractive force ______ with increasing distance between particles.

The ratio of moles of atoms in 12g of magnesium and 16g of sulphur will be:

1. 3 : 4
2. 4 : 3
3. 1 : 1
4. 1 : 2