A student adds a few drops of the universal indicator to a solution of dilute hydrochloric acid. He would observe that the colour of the solution changes from colorless to: A. red B. yellow C.violet D. green

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?