Is Matter Around Us Pure ? — Science STD 9 — Question

Viruses do not show any characteristic of living until they enter a living cell, because of the absence of:

Apparent loss of weight of a body when immersed in a liquid can be explained on the basis of:

Which of the following statements is false?

Which is the following is known as “physical basis of life”?

1. Gene.
2. Protoplasm.
3. Nucleolus.
4. Mitochondria.

Water falls from a height of 60m at the rate of 15kg is  operate a turbine. The soosses due to frictional forces are 10% of energy. How much power is generated by the turbine? (Take, g = 10m/ s²)

The term chromosome was given by:

Which of the following situations involves the Newton's second law of motion?

1. A force can stop a lighter vehicle as well as a heavier vehicle which are moving.
2. A force can accelerate a lighter vehicle more easily than a heavier vehicle which are moving.
3. A force exerted by a lighter vehicle on collision with a heavier vehicle results in both the vehicles cor to a standstill.
4. A force exerted by the escaping air from a balloon in the downward direction makes the balloon to go upwards.

Atom : .................... : : Electrons : Negatively charged:

Bone marrow is important for:

The covering tissue of external and internal surfaces of animals is: