A sample of metal weighs 210g in air, 140g in water and 120g in an unknown liquid. Then A. The density of the metal is 3g/cm3 B. The density of the metal is 7g/cm3 C. Density of the sample metal is 4 times the density of unknown liquid D. The metal still floats in water

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?