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Recent questions tagged medium
Questions
when a low flying passes overhead , we sometimes notice a slight shaking of the picture on our TV screen . Suggest a possible explanation .
cbse
class12
physics
ch-10
sec-b
ncert
medium
asked
Jun 15, 2016
by
meena.p
1
answer
Two towers on top of two hills are 40 km apart. The line joining then passes 50 m above a hill halfway between the tower . What is the longest wavelength of radio waves , which can be sent between the towers with out appreciable diffraction effects ?
cbse
class12
physics
ch-10
sec-b
ncert
medium
asked
Jun 15, 2016
by
meena.p
1
answer
Estimate the distance for which ray is good approximation for an aperture of $4\;mm$ and wave length $400\;nm$
cbse
class12
physics
ch-10
sec-a
ncert
medium
asked
Jun 14, 2016
by
meena.p
1
answer
In Young's double slit experience using monochromatic light of wave length $\lambda$ , the intensity of light at a point on the screen where path different is $\lambda$ is k units. What is the intensity at a point where path different is $\large\frac{\lambda}{3}$
cbse
class12
physics
ch-10
ncert
medium
sec-e
asked
May 26, 2016
by
meena.p
1
answer
In yang's double slit experiment , the slit are separated by $0.25$ mm and the screen is placed 1.4 m away. The distance the control bright fringe and the fourth bright fringe is measured to be 1.2 cm determine the wave length of light used in the experiment
cbse
class12
physics
ch-10
sec-b
ncert
medium
asked
May 26, 2016
by
meena.p
1
answer
A ray of light is incident at an angle of $60^{\circ}$ on a horizontal plane mirror. Through what angle should the mirror be titled to make the reflected ray horizontal ?
cbse
class12
physics
ch-9
sec-a
ncert
medium
asked
May 25, 2016
by
meena.p
1
answer
For a glass prism $(\mu=\sqrt 3)$ the angle of minimum deviation is equal to the angle of the prism . Find the angle of the prism .
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 25, 2016
by
meena.p
1
answer
The immiscible liquids of densities $d_1 > d_2 > d_3$ and refractive indices $\mu_1 > \mu_2 > \mu_3$ are put in a beaker . The height of each liquid column is $\large\frac{h}{3}$. A dot is made at the bottom of the beaker . For near normal vision, find the apparent depth of the dot .
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 25, 2016
by
meena.p
1
answer
The radius of culvature of the curved surface of a plano - convex lens is 20 cm . If the refractive index of the material of the lens be 1.5 , it will
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 24, 2016
by
meena.p
1
answer
You are given four sources of light each one providing a light of a single colour - red, blue , green , and yellow . Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is $90^{\circ}$ Which of the following statement is correct if the source of yellow light is replaced with that of other lights without changing the angle of incident ?
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 24, 2016
by
meena.p
1
answer
Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards .A current in the coil produces a defection of $35^{\circ}$ of the mirror . What is the displacement of the reflected spot of light on ascreen 1.5 m away ?
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 24, 2016
by
meena.p
1
answer
An angular magnification (magnifying power ) of 30 x is desired using an objective of focal length 1.25 cm and an eye piece of focal length 5 cm. How will you set up the compound microscope ?
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 23, 2016
by
meena.p
1
answer
When viewing through a compound microscope our eyes should be positioned not on the eye piece, but a short distance away from it for best viewing , why ? How much should be the short distance between the eye and the eyepiece ?
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 23, 2016
by
meena.p
1
answer
In viewing through a magnifying glass, one usually position one's eye very close to the lens , Does angular magnification change if the eye is moved back ?
cbse
class12
physics
ch-9
sec-a
ncert
medium
asked
May 23, 2016
by
meena.p
1
answer
The angle subtended at the eye by an object is equal to the angle subtended at the eye by the virtual image produced by the magnifying lens. In what sense does a magnifying glass provided angular magnification ?
cbse
class12
physics
ch-9
sec-a
ncert
medium
asked
May 23, 2016
by
meena.p
1
answer
What should be the distance between the object and magnifying glass (converging lens of focal length 10 cm) if the virtual image of each square is to have an area of $6.25 mm^2$, would you be able to see the square distinct with your eyes very close to magnifier ?
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 23, 2016
by
meena.p
1
answer
A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held close to the eye. At what distance should the lens be held from the card sheet in order to view the squares distinct with the minimum possible magnifying power ? Is the magnification equal to the magnifying power in this case ? explain
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 20, 2016
by
meena.p
1
answer
A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held . close to the eye. Is the magnification same as the magnifying power ? explain
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 20, 2016
by
meena.p
1
answer
A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held . close to the eye. What is the magnification produced by the lens ? How much is the area of each square in the virtual image ?
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 20, 2016
by
meena.p
1
answer
A man with normal near point (25 cm) reads a book with small print using a magnifying glass a thin convex less of focal length 5 cm what are the closest and farthest distance at which he can read the book , When viewing through the magnifying glass? What is the maximum and the minimum angular magnification possible using the above simple microscope ?
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 20, 2016
by
meena.p
1
answer
A man with normal near point (25 cm) reads a book with small print using a magnifying glass a thin convex less of focal length 5 cm what are the closest and farthest distance at which he can read the book , When viewing through the magnifying glass?
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 20, 2016
by
meena.p
1
answer
For a normal eye, the far point is at infinity and the near point of distinct vision is about 25 cm in front of the eye. The cornea of the eye provides a converging power of about 40 diepter and the least converging power of eye lens behind the cornea is about 20 dioptre. From this rough data, estimate the range of accommodation of normal eye .
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 18, 2016
by
meena.p
1
answer
You are given prisms made of crown glass and flint glass with a wide variety of angles. suggest a combination of prism which will deviate a pencil of white light with out much dispersion . which will displace a pencil of white light with out much deviation .
cbse
class12
physics
ch-9
sec-a
ncert
medium
asked
May 18, 2016
by
meena.p
1
answer
You are given prisms made of crown glass and flint glass with a wide variety of angles. suggest a combination of prism which will deviate a pencil of white light with out much dispersion .
cbse
class12
physics
ch-9
sec-a
ncert
medium
asked
May 17, 2016
by
meena.p
1
answer
A cross section of a light pipe made of a glass fibre of refractive index 1.68 . The outer covering of the pipe is made of material of refractive index 1.44 . What is the answer if there is no outer using of the pipe ?
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 13, 2016
by
meena.p
1
answer
A cross section of a light pipe made of a glass fibre of refractive index 1.68 . The outer covering of the pipe is made of material of refractive index 1.44 . What is the range of the angles of incident rays with the axis of pipe for which the total reflection inside the pipe takes place .
cbse
class12
physics
ch-9
sec-c
ncert
medium
asked
May 13, 2016
by
meena.p
1
answer
use the mirror equation to deduce that an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image.
cbse
class12
physics
ch-9
sec-a
ncert
medium
asked
May 13, 2016
by
meena.p
1
answer
use the mirror equation to deduce that an object placed between f and 2f of a concave mirror produces a real image beyond 2f.
cbse
class12
physics
ch-9
sec-a
ncert
medium
asked
May 12, 2016
by
meena.p
1
answer
A giant refracting telescope at an observatory has an objective lens of focal length 1.0 cm is used , what is the angular magnification of the telescope ? if this telescope is used to view the moon, what is the diameter of the image of the moon formed by this objective lens? The diameter of the moon is $3.48 \times 10^6 \;m$ and radius of the lunar orbit is $3.8 \times 10^8\;m$
cbse
class12
physics
ch-9
sec-b
ncert
medium
asked
May 12, 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 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
In a row of cadets, George is standing at 11th position from right, and Neha is standing at 10th position from left. If George and Neha, interchanges their position, Neha becomes 16th from left. How many cadets are their in the row ?
class5
math
olympiad
medium
logical reasoning
position and ranking
asked
Dec 31, 2015
by
pady_1
1
answer
In a row of students, Balvinder is standing at the 6th position from the left, and Kareem is standing at the 18th position from right. If Balvinder and Kareem interchange their positions, Kareem becomes 24th from right. How many students are their in the row ?
class5
math
olympiad
medium
logical reasoning
position and ranking
asked
Dec 31, 2015
by
pady_1
1
answer
If two days after tomorrow will be a Tuesday, when was Thursday ?
class5
math
olympiad
logical reasoning
simple puzzles
medium
asked
Dec 31, 2015
by
pady_1
1
answer
A watch shows 4:30 as the time. If the MINUTE hand points to NORTH-EAST, in what direction does the HOUR hand point?
logical-and-analytical-reasoning
class5
math
olympid
logical reasoning
days times and dates
medium
asked
Dec 31, 2015
by
pady_1
1
answer
Today is Friday, what will be the day after 73 days ?
class5
math
olympiad
logical reasoning
simple puzzles
medium
asked
Dec 31, 2015
by
pady_1
1
answer
Find the missing number. 14472 , _______ , 20472 , 23472
class5
math
olympiad
logical reasoning
missing number
medium
logican-analytical-reasoning
asked
Dec 31, 2015
by
pady_1
1
answer
Choose the missing terms out of the given alternatives : AZ, GT, MN, ?, YB
class5
math
olympiad
logical-analytical-reasoning
logical reasoning
missing term
medium
asked
Dec 31, 2015
by
pady_1
1
answer
The day after tomorrow is my sister's birthday. On the same day next week is the festival of Onam. If today is Saturday, what will the day after Onam be?
class5
math
olympiad
logical reasoning
medium
simple puzzles
asked
Dec 31, 2015
by
pady_1
1
answer
In a row of passengers, Rahul is standing at the 14th position from the front, and Sonia is standing at the 16th from back. If Rahul and Sonia interchange their positions, Sonia becomes 25th from the back. How many passengers are their in the row ?
class5
math
olympiad
medium
logical reasoning
position and ranking
asked
Dec 31, 2015
by
pady_1
1
answer
In a ground, Ram notices that there are 32 legs. How many people and dogs are there in the ground ?
class5
math
olympiad
medium
logical reasoning
asked
Dec 31, 2015
by
pady_1
1
answer
In a row of cadets, Messi is standing at the 13th position from the back, and Ronaldo is standing at the 9th position from front. If they interchanges their positions, Ronaldo becomes 17th from front. How many cadets are their in the row?
class5
math
olympiad
medium
logical reasoning
position and ranking
asked
Dec 31, 2015
by
pady_1
1
answer
What is the 6th term in the series 5, 10, 15, 20.....
class5
math
olympiad
logical-analytical-reasoning
missing term
logical reasoning
medium
asked
Dec 31, 2015
by
pady_1
1
answer
Among five friends, Divya is taller than Kareem, but not as tall as Rohit. Alisha is taller than Sunil but shorter than Kareem. Who is tallest in the group ?
class5
math
olympiad
logical reasoning
simple relations
medium
logican-analytical-reasoning
asked
Dec 31, 2015
by
pady_1
1
answer
Each bag of bananas weighs 3 kgs 130 grams. If the total weight of a sack containing bananas bags is 97.03 kgs, then how many bags are in the sack?
class5
math
olympiad
measurements
97
medium
everyday mathematics
decimals
everyday math
asked
Dec 31, 2015
by
pady_1
1
answer
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