A block of mass 1 Kg lies on a horizontal surface in a truck. The coefficient of a static friction between the block and the surface is 0.6. What is the force of friction on the block if the acceleration of the truck is 5m/s2 ? (Take g=10m/s2 ) A. 5 N B. 6 N C. 7 N D. 8 N

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?