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CBSE Questions

Total Questions 9982
what are the various factors that would lead to the rise of a new species ?
why are traits acquired during the life line of an individual or organism not inheritant ?
D,E and F are respectively mid-points of BC,CA,AB of triangle ABC.Show that : i)BDEF is a parallelogram ii)ar{DEF}=1/4ar[ABC] iii)ar{BDEF}=1/2ar{ABC}
what are the different ways in which individuals with a particular trait may increase in a population ?
with respect to air refractive index of kerosene 1.44 and for diamond 2.42. calculate the refractive index of diamond with respect to kerosene ?
what is the power of a concave lens of focal length 50cm ?
a lens forms virtual and enlarged image of an object ? what type of lens is this?
what is the unit of refractive index ?
for which mirror focal length is negative?
a person wants to form a enlarged image .which mirror he should use?
why does driver prefer to use a convex mirror as a rear view mirror in a automobile?
a mirror forms erect and diminished image of an object?what type of mirror is this?is that image real or inverted?
what is the focal length of a plane mirror?
angle between plane mirror and incident ray is 30 degree .what is the angle of reflection?
Can you please explain about IT industry at Silicon Valley, California,USA?
for which porpose we usemicrosoft acess??
1234+986+456+6534+987+45=
A 1.2 m tall girl spots a balloon moving with the wind in a horizontal line at a height of 88.2 m from the ground. The angle of elevation of the balloon from the eyes of the girl at any instant of 60 degree. After sometime, the angle of elevation reduces to 30 degree. Find the distance traveled by the balloon during the interval.
The difference of square of two numbers is 180. The square of the smaller number is 8 times the large number.Find the numbers.
A two digit number is such that the product of the digits is 35.When 18 is added to the number, the digits interchange their places. Determine the number.