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Recent questions tagged ch-9
Questions
A person with a normal near point $(25 cm)$ using a compound microscope with an objective of focal length 8.0 mm and an eye piece of focal length 2.5 cm can bring an object placed 9.0 mm from the objective in sharp focus. what is the separation between the two lenses ? calculate the magnifying power of the microscope ?
cbse
class12
physics
ch-9
ncert
easy
sec-c
asked
Mar 3, 2016
by
meena.p
1
answer
A compound microscope consists of an objective less of focal length $2.0\;cm$ and an eye -piece of focal legth $6.25\;cm$ , separated by a distance of 15 cm . How far from the objective should an object be placed in order to obtain the final image at the least distance of distinct vision (25 cm) .
cbse
class12
physics
ch-9
ncert
easy
sec-b
asked
Mar 3, 2016
by
meena.p
1
answer
A compound microscope consists of an objective less of focal length $2.0\;cm$ and an eye -piece of focal legth $6.25\;cm$ , separated by a distance of 15 cm . How far from the objective should an object be placed in order to obtain the final image at the least distance of distinct vision (25 cm) . What is the magnifying power
cbse
class12
physics
ch-9
ncert
easy
sec-c
asked
Mar 3, 2016
by
meena.p
1
answer
What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20 cm. Is the system a converging or a diverging less ? Ignore the thickness of the thickness of the lenses
cbse
class12
physics
ch-9
ncert
easy
sec-e
asked
Mar 3, 2016
by
meena.p
1
answer
An object of size $3.0\;cm$ is placed 14 cm in front of a concave lens of focal length $21\;cm$. Describe the image produced by the less. What happens if the object is moved further from the less ?
cbse
class12
physics
ch-9
ncert
easy
sec-e
asked
Mar 3, 2016
by
meena.p
1
answer
An object of size $3.0\;cm$ is placed 14 cm in front of a concave lens of focal length $21\;cm$. Describe the image produced by the less.
cbse
class12
physics
ch-9
ncert
easy
sec-e
asked
Mar 3, 2016
by
meena.p
1
answer
A beam of light coverage to a point P. A lens is placed in the path of the convergent beam 12 cm from P. At what point does the beam converge if the lens is a concave lens of focal length 16 cm ?
cbse
class12
physics
ch-9
sec-b
ncert
easy
asked
Feb 17, 2016
by
meena.p
1
answer
A beam of light coverage to a point P. A lens is placed in the path of the convergent beam 12 cm from P. At what point does the beam converge if the lens is to be 20 cm ?
cbse
class12
physics
ch-9
sec-b
ncert
easy
asked
Feb 17, 2016
by
meena.p
1
answer
Double convex lenses are to be manufacture from a grass of refractive index 1.55 , with both a glass of refractive index 1.55 with both faces of same radius of curvature . What is the radius of curvature required if local length of lens is to be 20 cm ?
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
Feb 17, 2016
by
meena.p
1
answer
A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism. By rotating the prism the minimum angle of deviation is measured to be $40 ^{\circ}$ The refractive angle of the prism is $60^{\circ}$ If the prism is placed in water (refractive index 1.33) predict the new minimum angle of deviation of a parallel beam of light
cbse
class12
physics
ch-9
ncert
difficut
sec-c
asked
Feb 17, 2016
by
meena.p
1
answer
A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism. By rotating the prism the minimum angle of deviation is measured to be $40 ^{\circ}$ What is the refractive index of the prism ?
cbse
class12
physics
ch-9
sec-b
ncert
easy
asked
Feb 15, 2016
by
meena.p
1
answer
A placed bulb is placed at the bottom of a tank containing water to a depth of 80 cm. What is the area of the surface of water through which light from the bulb can emerge out ? Refractive index of water is 1.33 consider the bulb to be a point source .
cbse
class12
physics
ch-9
sec-b
ncert
difficult
asked
Feb 15, 2016
by
meena.p
1
answer
A tank is filled with water to a height of 12.5 cm . What will be apparent depth if the refractive index to the mirror , how would the screen have to be moved ?
cbse
class12
physics
ch-9
sec-a
q6
ncert
medium
asked
Feb 10, 2016
by
meena.p
1
answer
A tank is filled with water to a height of 12.5 cm . The apparent depth of a needle lying at the bottom of the tank is measured by a microscope to be $9.4\;cm$ . What is the refractive index of water ?
cbse
class12
physics
ch-9
sec-a
q5
ncert
medium
asked
Feb 10, 2016
by
meena.p
1
answer
A 4.5 cm needle is placed away from a convex mirror of focal length 15 cm . Describe what happens as the needle is moved faster from the mirror.
cbse
class12
physics
ch-9
sec-a
q4
ncert
medium
asked
Feb 10, 2016
by
meena.p
1
answer
A 4.5 cm needle is placed away from a convex mirror of focal length 15 cm . give the location of the image and the magnification .
cbse
class12
physics
ch-9
sec-b
q3
ncert
medium
asked
Feb 10, 2016
by
meena.p
1
answer
A small candle 2.5 cm in size is placed 27 cm in front of a concave mirror of radius of curvature 36 cm. If the candle is moved closer to the mirror, how would the screen have to be moved ?
cbse
class12
physics
ch-9
sec-b
q2
ncert
medium
asked
Feb 10, 2016
by
meena.p
1
answer
A small candle 2.5 cm in size is placed 27 cm in front of a concave mirror of radius of curvature 36 cm. At what distance from the mirror should a screen be placed in order to receive a sharp image ? Describe the nature and size of the image ?
cbse
class12
physics
ch-9
sec-b
q1
ncert
medium
asked
Feb 10, 2016
by
meena.p
1
answer
Evaluate : $S^{-2}$ if $S=5$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 27, 2015
by
meena.p
1
answer
Divide : $x^8 y^9 \div x^4y^3$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 27, 2015
by
meena.p
1
answer
If $J=3$ then Solve $(J^3.J^4)^3=?$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 27, 2015
by
meena.p
1
answer
If $x^3 =-216,x=? $
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 27, 2015
by
meena.p
1
answer
Find the value of x $4^x=1024$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 27, 2015
by
meena.p
1
answer
Find the value of y : $3^{y-1}=81$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 27, 2015
by
meena.p
1
answer
Simplify $\bigg( \large\frac{V^5m^{-2}}{V^7}\bigg)^2$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 27, 2015
by
meena.p
1
answer
Divide : $\large\frac{x^5 y^3 z^2}{x^3y^2z}$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 27, 2015
by
meena.p
1
answer
Divide : $ \large\frac{32 a^4\;b^2}{8a^3b^2}$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 27, 2015
by
meena.p
1
answer
If $x^2$ is added to x, the sum is $42$ Which of the following could be a value of x?
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 27, 2015
by
meena.p
1
answer
Simplify : $V^3.V^5.V^7.W^2.W^4$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Simplify $\large\frac{y^6z^{12}}{(yz)^3}$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Simplify : $(4x^2 y^7)$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Solve: $15b^0 c^8d^{-6}. 7bc^3d^5$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
What is the value of $(2^3.6) -3^2$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Simplify $(2)^3 .(-2)^1.(-2)^2.(-2)^6$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Simplify $\large\frac{8x^3y^{-5}}{4x}$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
To simplify the following expression correctly , what must be done with the exponents? $(25^a)^b$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Simplify : $(3mn^4)^3$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Simplify : $ \large\frac{9x^4y^5}{6x^2 y^{10}}$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Find the value of $(3^0 +4^{-1}) \times 2^2$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Simplify : $ \large\frac{25 \times t^{-4}}{5^{-3} \times 10 \times t^{-8}}$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Find the value of $ \bigg[ \bigg( \large\frac{-2}{3}\bigg) ^{-2} \bigg]^1$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
A group of students were given an assignment to collect different types of leaves . The group collected $243$ types of leaves. Represent the number of leaves collected in the form of exponents expression with its base being indivisible.
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Simplify : $\bigg\{ \bigg(\large\frac{1}{3}\bigg) ^{-2} -\bigg( \large\frac{1}{2}\bigg)^{-3} \bigg\}$$ \div \bigg( \large\frac{1}{4}\bigg)^{-2}$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Very small numbers can be expressed in standard form using _________ exponents .
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
2
answers
Find the value of $(3^{-1} +4^{-1} +5^{-1})^0$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Evaluate the exponential expression $(-m)^2 \times (-m)^2 $ for $m=3$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
Find the value of m for which $5^m \div 5^{-3}=5^5$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
The area of a square is given by the formula $A=c^2$. What will be the total area of 5 such similar squares, if the side of the square is $7\;cm$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
$(x^{-1} +4^{-1}+2^{-1} +8^{-1})^x= 1$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
1
answer
$(x^{-1} +4^{-1}+2^{-1} +8^{-1})^x= 1$
olympiad
class8
math
ch-9
exponents-and-powers
asked
Jun 26, 2015
by
meena.p
0
answers
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