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CBSE->Plus 2 Biology Science Questions

Total Questions 190
A thin soap film is formed between the wire of a rectangular frame & the light slider supports a wire slider is 0.4m. Calculate the surface tension of the soap solution.
Calculate the work done in blowing a soap bubble from radius 1cm to 3cm with a soap solution of surface tension 30*10-3 N/m.
A boy balances a pair of unequal masses at the ends of a light uniform massless rod at a mid point. (a)What name can give to this special point at which the masses are balanced. (b)Derive an expression for the point.
Define the term orbital velocity and escape velocity and derive the relation between them.
An earth satellite makes a complete circuit around the earth in 90 minutes.If the orbit is circular estimate the height of the satellite above the earth.Take the radius of the earth is 6370km and g=9.8m/s2.
The angular speed of a wheel is increased from 1200rpm in 16 sec. What is the angular acceleration assuming it to be uniform. Also estimate the total number of revolutions does the engine make during this time.
summary of cell cycle & cell division
A metal rode that is 4m long and 0.5cm in cross section area is found to stretch 0.2cm under a tension of 5000N. What is the Young's modulus of the metal.
A spring balance has a scale that reads from 0 to 50 kg.The length of the scale is 20cm.A body suspended from this balance,when displaced and released,oscillates with a period of 0.6s.What is the weight of the body?
Explain forward biased and reverse biased?
What is the priority list for naming organic compounds?
Name the chemical produced by monarch butterfly against its predator(birds).how is the chemical produced in the butterfly?
what is meant by 'competitive release'?
Name the chemical that Monarch butterfly produce against its predator(bird). How is the chemical produced ?
The female mosquito is not considered a parasite, although it needs our blood for reproduction. explain why ?
why no classnote is given on the chapter Eco System?
what is ecosystem
please brief on Ecosystem
what is lac operon and its functions?
please include calvin cycle and photosynthetic pathway in the animated section as soon as possible...