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CBSE->Std 10 Questions

Total Questions 2595
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?
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.
Who is patol babu?
why is arthropoda named so?
what is ATP?
what is analogy and homology?
is influence healthy in democracy ? explain three advantage and disadvantage ?
what is organic chemistry ?
Give some examples for reported speech.
Explain more about fossils ? How to determine the age of fossils ?