Structure of the Atom — Science STD 9 — Question

The growing of different crops on a piece of land in pre-planned succession is called: 

A freely falling object travels 4.9m in 1st second, 14.7m in 2nd second, 24.5m in 3rd second, and so on. This data shows that the motion of a freely falling object is a case of:

1. Uniform motion.
2. Uniform acceleration.
3. No acceleration.
4. Uniform velocity.

The symbol of copper is:

............... takes part in the formation of lysosomes:

A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to:

The area of speed time graph is…

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

Herdmania is a:

1. Urochordate.
2. Cephalochordate.
3. Hemichordate.
4. Craniate.

Each cell of unicelluler organism performs certain functions such as _________.

A body was initially moving with 10 m/ sec and it starts acceleration with 2 m/ sec², the distance covered by it in 10 sec will be