Question
What are cathode rays? What is the nature of charge on cathode rays?
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What is protists? Define immunization.
Explain why, wooden (or concrete) sleepers are kept below the railway line.
Which one of the following crops require a minimum quantity of NPK or urea for its proper growth paddy, peas, wheat, sugarcane.
Name the region of the atmosphere where most of the atmospheric gases are present.

Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?
Distinguish between farmyard manure and compost manure.
Explain by an example that a body may possess energy even when it is not in motion.