A ball is thrown vertically upwards with a velocity of 20ms−1 from the top of a multi storey building. The height of the point where the ball is thrown 25m from the ground. How long will it be before the ball hits the ground? Take g=10ms−2 . A. t = 5s B. t = 10s C. t = 15s D. t = 20s

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?