- State the principle of an ac generator and explain its working with the help of a labelled diagram. Obtain the expression of the emf induced in a coil having N turn each of cross-sectional area A, rotating with the constant angular speed in a magnetic field ω , directed perpendicular to the axis of rotation.

Wavelength of green light is

A) 400-450 nm

B) 500-550 nm

C) 660-720 nm

D) 720-800 nm

What is the difference between anaerobic & aerobic respiration? Name some organism that uses the aerobic mode of respiration?

What are the main components of our environment? Explain each of them briefly.

What are examples of hydrotropism plants?

Why is water liquid at room temperature?