Natural Resources — Science STD 9 — Question

Maximum milk yielding buffalo is:

A change in the physical state can be brought about:

A solution of copper oxide was prepared by heating, igniting and precipitation. Which of the following method will give higher ratio of copper oxide:

Select the correct statement(s).
i.A solution in which size of the solute particles is about 10-10 m, is called true solution.
ii.A solution which contains maximum possible amount of solute at any given temperature is called a saturated solution.
iii.In suspension, the size of particles is of the order of 107 m or larger
iv. A colloid is a heterogeneous system

Which of the following energy change involves frictional force?

Which of the following statements is correct for a particle travelling with a constant speed:

Nitromonas bacteria convert:

Which among the following statements is true:

You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture?

It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice: