Why is graphite used as a dry lubricant in machinery? a.) Each carbon atom undergoes sp3 hybridization in graphite b.) Graphite has layered structure and it cleaves between the layers and therefore it is very soft and slippery c.) Graphite is a non-conductor of electricity d.) Graphite has two sigma bonds and two pi bonds

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?