Give one precaution that should be taken while handling switches.

Mention two important precautions that should be taken while handling radioactive materials

Explain the precautions that should be taken while measuring length using a ruler

State three safety precautions that you would take while handling the radioactive substances.

State two precautions that you must take when switching on an electric circuit.

A person shows strong unusual hypersensitive reactions when exposed to certain substances present in the air. Indentify the condition. Name the cells respondible for such reactions. What precaution should be taken to avoid such reactions.

Thermal power plants are inevitable in an industrial and densely populated country like ours. What harm do they do the environment ?Also mention any precaution that could be taken to save our environment.

List any five precautions to be taken while performing an experiment in a chemistry laboratory.

List four precautions which a student should observe while determining the focal length of a given convex lens by obtaining image of a distant object on a screen.

Using the principle of Wheatstone Bridge, describe the method to determine the specific resistance of a wire in the laboratory. Draw the circuit diagram and write the formula used. Write any two important precautions you would observe while performing the experiment.

The switch should not be touched with wet hands.