The Fundamental Unit of Life — Science STD 9 — Question

When a cell is placed in a medium, and it increases in size, the external medium is:

The mass of moon is about 0.012 times that of the earth and its diameter is about 0.25 times that of earth. The value of G on the moon will be:

Rotation of leguminous crop with wheat or maize is an example of _________:

White gold used in jewellery contains two elements, gold and palladium. A jeweller has two different samples that are both identical in appearance and have a uniform composition throughout. What can be said about the samples?

An object of mass 2kg is sliding with a constant velocity of 4m/s on a frictionless horizontal table. The force required to keep this object moving with the same velocity is:

1. 32N
2. 0N
3. 2N
4. 8N

Which of the following are chemical changes?

1. Decaying of wood.
2. Burning of wood
3. Sawing of wood
4. Hammering of nail into wood

The cause of floating of clouds in atmosphere is:

If 12 gram of carbon has x atoms, then the number of atoms in 12 grams of magnesium will be:

Cells and their surrounding cell membrane are usually very small because:

P.E of a spring increases when it is in the state of: