Which one of the following statements is incorrect? A. frictional force opposes the relative motion B. rolling friction is smaller than sliding friction C. coefficient of sliding friction has dimensions of length D. limiting value of static friction is directly proportional to normal reaction

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?