A sharp image of a distant object is obtained on a screen using a convex lens. In order to determine the focal length of a lens, a student needs to measure the distance between: A. Lens and object B. Lens and screen C. Object and the screen D. Lens and the screen and also object and the screen

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?