Question
Explain, how efficiency of irrigation can be increased.
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State the definition of health given by WHO. Write down the traits of a healthy person.
Give one use of ultrasound in industry and one in hospitals.
A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo? Speed of sound in air is 33m/s.
Steel sinks in water but a steel boat floats. Why?
What is the kinetic energy of a body of mass 1kg moving with a speed of 2m/s?
Name four types of bacteria involved in nitrogen cycle.