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CBSE Questions

Total Questions 9982
Define reproductive isolation with example?
properties of some elements are given.name them if possible and where would we locate this elements? 1.an element with variable valency(more than one)stored under water. 2.an element which is tetra valent in organic chemistry.
What is the pheno typic ratio of a dihybrid cross in F2 generation?
Name the (4th) fourth member of alkene series.
The sum of first q terms of an AP is is 63q-3q². If the p-th term is -60, find the value of p. Also find the 11th term of this AP.
The n-th term of an AP is 7-4n. Find its common difference.
The angle of elevation of the top of a tower as seen from a point on the ground is (say) ? such that tan ?= 3/4. From another point, 240 m away from this point on the line joining this point to the foot of the tower, the angle of elevation (say) 'a' of the top of the tower is such that tan 'a' = 5/12. Find the height of the tower.
The area of the incircle of an equilateral triangle is 154 square centimeter.What is the perimeter of the triangle? (Use ?3= 1.73)
The radii of the circular bases of a right circular cylinder and a cone are in the ratio of 3:4 and their heights are in the ratio 2:3. What is the ratio of their volumes?
Can we make programs with notepad?How?
Speech On Importance Of Discipline In daily Life
A shopkeeper expects a gain of 22½% on his cost price. If in a week, his sale was of Rs.392, what was his profit?
IF THE SUM OF 1ST m TERMS OF AN AP IS SAME AS THE SUM OF ITS FIRST n TERMS. SHOW THAT THE SUM OF ITS FIRST m+n TERMS IS ZERO
THE SUM OF THE 3RD AND 7TH TERMS OF AN AP IS 6 AND THEIR PRODUCT IS 8 FIND THE SUM OF 1ST 20 TERMSOF AP
HOW ARE FORESTS USEFUL TO US ?
write a summary on wildlife in India?
How money acts as a medium of exchange?
Distinguish between haploid and diploid cells?
derive the formula f=r/2
Define allele.