Choose the correct option.

A rectangular coil of copper wire is rotated in magnetic field. The direction of the induced current changes ones in each

(a) two revolutions (b) one revolution

(c) half revolution (d) one-fourth revolution

What type of questions asked from the lesson of magnetic effect of electric current 

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?