Magnetic Effects of Electric Current — Science STD 10 — Question

Write down the magnification formula for a lens in terms of object distance and image distance. How does this magnification formula for a lens differ from the corresponding formula for a mirror?

A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits-blood group A or O is dominant? Why?

When a person breathes in air, the air enters into his body through an organ Ahaving two holes B in it. The air then passes through pharynx and larynx and enters into a tube C. The tube C divides into two smaller tubes D at its lower end. The two smaller tubes are attached to two respiratory organs E. Each smaller tube divides inside the organs E to form a large number of still smaller tubes called F. The smallest tubes F have air-sacs G at their ends in which gaseous exchange takes place in the body of the person. What are A, B, C, D, E, F and G?

Name an indicator which is:

1. Pink in acidic solution and yellow in basic solution.
2. Colourless in acidic solution and pink in basic solution.

Write some of the important uses of electromagnets.

Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid.

In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?

What would be the advantages of exploiting resources with short-term aims?

What are the causes of depletion of ozone layer? Which diseases are likely to be caused if the ozone layer will become thinner?

If a ray of light enters from alcohol to air. The refractive index of alcohol is 1.36. Calculate the speed of light in alcohol with respect to air.