Equal torque are applied about a central axis on two rings of same and same thickness but made up of different materials. If ratio of their densities is 4:1then the ratio of their angular acceleration will be:- A. 4:1 B. 1:16 C. 8:1 D. 1:12

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?