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Recent questions tagged ncert
Questions
A diver under water looks obliquely at a fisherman standing on the bank of a lake. would the fisherman look taller or shorter than what he actually is?
cbse
class12
physics
ch-9
sec-a
ncert
easy
asked
May 13, 2016
by
meena.p
1
answer
You have learnt that plane and convex mirror produce virtual images of objects . can they produced real images under some circumstances . Explain
cbse
class12
physics
ch-9
sec-a
ncert
easy
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 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
A small pin fixed on a table top is viewed from above from a distance of 50 cm. By What distance would the pin appear to be raised , if it be viewed from the same point through a 15 cm thick glass slab held parallel to the table ? $\mu$ of glass is 1.5 . Does the answer depended on location of the slab ?
cbse
class12
physics
ch-9
sec-a
ncert
easy
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, the virtual image produced by a convex mirror is always diminished i size and is located between the focus and the pole.
cbse
class12
physics
ch-9
sec-a
ncert
easy
asked
May 13, 2016
by
meena.p
1
answer
use the mirror equation to deduce that a convex mirror always produces a virtual image independent of the location of the object.
cbse
class12
physics
ch-9
sec-b
ncert
easy
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
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 ?
cbse
class12
physics
ch-9
sec-a
ncert
easy
asked
May 12, 2016
by
meena.p
1
answer
A small telescope has an objective terms of focal length $144\;cm$ and an eye -piece of focal length $6.0\;cm$ . What is the magnifying power of the telescope ?What is the seperation between the objective and the eyepiece ?
cbse
class12
physics
ch-9
sec-b
ncert
easy
asked
May 12, 2016
by
meena.p
1
answer
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
A change 3 coulomb is moving velocity $\overrightarrow{v}=(4 \hat i +3 \hat j) ms^{-1}$ in a magnetic field $\overrightarrow{B}=(4 \hat i +3 \hat j) wbm^{-2}$Find the force acting on the charge
cbse
class12
physics
ch-4
sec-a
q100
ncert
medium
asked
Aug 5, 2015
by
meena.p
1
answer
The magnetic field density applied in a cyclotron is $3.5 \;T$ what will be the frequency of electric field that must be applied between the dees in order to accelerate protons. Mass of protons $= 1.67 \times 10^{27}\;kg$
cbse
class12
physics
ch-4
sec-a
q99
ncert
medium
asked
Aug 5, 2015
by
meena.p
1
answer
The magnetic field density applied in a cyclotron is $3.5 \;T$ what will be the frequency of electric field that must be applied between the dees in order to accelerate protons. Mass of protons $= 1.67 \times 10^{27}\;kg$
cbse
class12
physics
ch-4
sec-a
q98
ncert
medium
asked
Aug 5, 2015
by
meena.p
1
answer
Magnetic field applied on a cyclotron is $0.7 \;T$ and radius of its dees is $1.8 \;m$ what will be the energy of the emergent protons in $MeV?$
cbse
class12
physics
ch-4
sec-a
q97
ncert
medium
asked
Aug 5, 2015
by
meena.p
1
answer
A galvanometer with a coil resistance $12 \Omega$ shows a full scale deflection for a current $2.5\;mA$ How will you convert it into a voltmeter of range $7.5 \;V$ Also find the total resistance of Voltmeter formed ?
cbse
class12
physics
ch-4
sec-b
q96
ncert
medium
asked
Aug 5, 2015
by
meena.p
1
answer
A galvanometer with a coil resistance $12.0 \Omega$ shows a full scale deflection for a current $2.5\;mA$ How it can be converted into an ammeter of range $7.5 \;A$ What will be resistance of ammeter formed ?
cbse
class12
physics
ch-4
sec-a
q95
ncert
medium
asked
Aug 4, 2015
by
meena.p
1
answer
An electron of energy $2000\;eV$ describes a path in magnetic field of flux density $0.2\;T$ What is the radius of this path ?
cbse
class12
physics
ch-4
sec-b
q94
ncert
medium
asked
Aug 4, 2015
by
meena.p
1
answer
A conductor of length $2\;m$ carrying current of $2\;A$ is held parallel to an infinitely long conductor carrying current of $10\;A$ at a distance of $100\;mm$ . Find the force on small conductor .
cbse
class12
physics
ch-4
sec-b
q93
ncert
difficut
asked
Aug 4, 2015
by
meena.p
1
answer
The ratio of the stunt resistance and the resistance of a galvanometer is $ 1,499$. If the full scale deflection current of the galvanometer is $2 \;mA$ then the range of ammeter is
cbse
class12
physics
ch-4
sec-a
q92
ncert
medium
asked
Aug 4, 2015
by
meena.p
1
answer
A change q moving along the x- axis with a velocity $\overrightarrow{v}$ is subjected to a uniform magnetic field B acting along the z -axis as it crosses the origin as shown in the figure. (i) Trace the trajectory (ii) Does the change gain kinetic as it enters the magnetic field ?
cbse
class12
physics
ch-4
sec-b
q91
ncert
medium
asked
Aug 4, 2015
by
meena.p
1
answer
Why do we prefer the along alnico for making permanent magnets.
cbse
class12
physics
ch-4
sec-a
q90
ncert
easy
asked
Aug 4, 2015
by
meena.p
1
answer
Why do we make use of steel for making permanent magnets.
cbse
class12
physics
ch-4
sec-a
q89
ncert
easy
asked
Aug 4, 2015
by
meena.p
1
answer
Why do use soft iron to make electromagnets?
cbse
class12
physics
ch-4
sec-a
q88
ncert
easy
asked
Aug 4, 2015
by
meena.p
1
answer
What is the susceptibility and permeability of a perfectly diamagnetic substance ?
cbse
class12
physics
ch-4
sec-a
q89
ncert
medium
asked
Aug 4, 2015
by
meena.p
1
answer
What is the relation between relative permeability and susceptibility
cbse
class12
physics
ch-4
sec-a
q88
ncert
easy
asked
Aug 4, 2015
by
meena.p
1
answer
What is unit of magnetic permeability ?
cbse
class12
physics
ch-4
sec-a
q87
ncert
easy
asked
Aug 3, 2015
by
meena.p
1
answer
A proton has spin and magnetic moment just like an electron . Why then its effect is neglected in magnetism of materials?
cbse
class12
physics
ch-4
sec-a
q82
ncert
easy
asked
Aug 3, 2015
by
meena.p
1
answer
Find the magnitude of the magnetic field at the origin O due to a very long conductor carrying current I of the shape .
cbse
class12
physics
ch-4
sec-a
q86
ncert
difficult
asked
Aug 3, 2015
by
meena.p
1
answer
Five long wires $A,B,C,D$ and $E$ each carrying current I are arranged to form edges of a pentagonal prism as shown in figure. Each carries current out of the plane of paper . What if current in one of the wires (say) A is reversed ?
cbse
class12
physics
ch-4
sec-a
q85
ncert
medium
asked
Aug 3, 2015
by
meena.p
1
answer
Five long wires $A,B,C,D$ and $E$ each carrying current I are arranged to form edges of a pentagonal prism as shown in figure. Each carries current out of the plane of paper . What will be the field if current in one of the wire (say A) is switched off ?
cbse
class12
physics
ch-4
sec-a
q84
ncert
medium
asked
Aug 3, 2015
by
meena.p
1
answer
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