CBSE Class 11-science Questions and Answers
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CBSE XI Science - Physics
An observer on moon observes angular diameter of earth as (σπ)0. If the distance between earth and moon is 3.84×108m and the radius of earth is 6400 km, the find the value of σ
Asked by akshataggarwal7704 | 3rd Mar, 2021, 10:52: PM
CBSE XI Science - Physics
find out the expression of final velocities of two bodies in an one dimensional elastic collision
Asked by dekakokil | 3rd Mar, 2021, 06:43: PM
CBSE XI Science - Physics
The frequency of stretched string depends upon length of string (l), tension in the string (t), and m per unit length (u) of the string. find the expression of vibration of string using method of dimension
Asked by tejpaljeet4 | 3rd Mar, 2021, 12:13: PM
CBSE XI Science - Biology
Chemical nature of chitin is...........
Asked by rjkalpeshtopper | 2nd Mar, 2021, 08:57: AM
CBSE XI Science - Chemistry
what is reaction mechanism
Asked by deepthibai74 | 1st Mar, 2021, 11:13: AM
CBSE XI Science - Physics
The speed of a particle of mass m, moving in a circle of radius r, is changing at a constant rate aT m/ s2. Write the expression for the magnitude of its instantaneous resultant acceleration. Can we say that the direction of this instantaneous resultant acceleration would be along the instantaneous (inward) radial acceleration
Asked by pranayshah1908 | 28th Feb, 2021, 12:18: PM
CBSE XI Science - Biology
which part of the cellmembrane
Asked by at718764 | 25th Feb, 2021, 01:48: PM
CBSE XI Science - Chemistry
What is Adsorption
Asked by toshan.dandi5 | 24th Feb, 2021, 09:24: PM
CBSE XI Science - Chemistry
When lead sulphide, PbS and lead oxide, PbO, are heated together the products are lead metal and sulphur dioxide, SO2.
PbS(s) + 2PbO(s)
3Pb (l) + SO2 (g).
If 14.0 g of lead oxide reacts according to the above equation, how many (a) moles of lead (b) grams of lead, (c) atoms of lead and (d) grams of sulphur dioxide are formed?
(Atomic mass : Pb = 207.0, S = 32.1 ; O =16.0)
Asked by seeni2005 | 24th Feb, 2021, 12:34: PM
CBSE XI Science - Chemistry
1) Calculate the number of Cl2 molecules and Cl atoms in 0.25 mol of Cl2 gas. 2) Molar mass of O is 16 g mol-1. What is the mass of one atom and one molecule of Oxygen?
Asked by seeni2005 | 19th Feb, 2021, 12:52: PM
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