Light Class 9th Science Tamilnadu Board Solution

Class 9th Science Tamilnadu Board Solution
Multiple Choice Questions
  1. The field of view * is maximum for ______________(* FOV is the extent of the observable…
  2. When a ray of light passes from one medium to another medium, refraction takes place when…
  3. __________ is used as reflectors in torchlight
  4. We can create enlarged, virtual images with
  5. When the reflecting surface is curved outwards the mirror formed will be…
  6. The focal length of a concave mirror is 5cm. Its radius of curvature is…
  7. When a beam of white light passes through a prism it gets
  8. The speed of light is maximum in
  9. A real and enlarged image can be obtained by using a
  10. Which of the following statements about total internal reflection is true?…
Cross Word Puzzle
  1. Cross word puzzleAcross2. Optical illusion due to refraction4. A type of mirror that…
Hots
  1. Light ray emerges from water into air. Draw a ray diagram indicating the change in its…
  2. When a ray of light passes from air into glass, is the angle of refraction greater than or…
  3. What do you conclude about the speed of light in a diamond if you are told that the…
True Or False
  1. The angle of deviation depends on the refractive index of the glass…
  2. If a ray of light passes obliquely from one medium to another, it does not suffer any…
  3. If the object is at infinity in front of a convex mirror the image is formed at infinity.…
  4. An object is placed at distance of 3 cm from a plane mirror. The distance of the object…
  5. The convex mirror always produces a virtual, diminished and erect image of the object.…
  6. The distance from centre of curvature of the mirror to the pole is called the focal length…
  7. When an object is at the centre of curvature of concave mirror the image formed will be…
  8. Light is one of the slowest travelling energy with a speed of 3 × 10–8 ms-1…
  9. The angle of incidence at which the angle of refraction is 0° is called the critical…
  10. The reason for brilliance of diamonds is mainly due to total internal reflection of light.…
Fill In The Blanks
  1. In going from a rarer to denser medium, the ray of light bends _______…
  2. The ratio of sine of the angle of incidence to the sine of _______ is a constant.…
  3. The mirror used in search light is ______.
  4. The angle of deviation of light ray in a prism depends on the angle of _____.…
  5. The radius of curvature of a concave mirror whose focal length is 5cm is _____.…
  6. A spherical mirror whose reflecting surface is curved outwards is called ________mirror…
  7. Large ________ mirrors are used to concentrate sunlight to produce heat in solar furnaces…
  8. All distances parallel to the principal axis are measured from the ______ of the mirror…
  9. A negative sign in the value of magnification indicates that the image is _________.…
  10. Light is refracted or bent while going from one medium to another because its _______…
Match The Following
  1. Match the following:i) List IList II1. Ratio of height of image to height of object.1.…
Assertion And Reason Type
  1. In the following questions, the statement of assertion is followed by a reason. Mark the…
  2. In the following questions, the statement of assertion is followed by a reason. Mark the…
Very Short Answer Type
  1. Give two examples of transparent medium that are denser than air.…
  2. According to cartesion sign convention, which mirror and which lens has negative focal…
  3. A coin in a glass beaker appears to rise as the beaker is slowly filled with water, why?…
  4. Name the mirror(s) that can give (i) an erect and enlarged image, (ii) same sized,…
  5. Name the spherical mirror(s) that has/havei) Virtual principal focusii) Real principal…
  6. If an object is placed at the focus of a concave mirror, where is the image formed?…
  7. Copy this figure in your answer book and show the direction of the light ray after…
  8. Why does a ray of light bend when it travels from one medium to another?…
  9. What is the speed of light in a vacuum? Who first measured the speed of light?…
  10. Concave mirrors are used by dentists to examine teeth. Why?
Short Answer Type
  1. a) Complete the diagram to show how a concave mirror forms the image of the object.b) What…
  2. Pick out the concave and convex mirrors from the following and tabulate themRear-view…
  3. State the direction of incident ray which after reflection from a spherical mirror…
  4. What is meant by magnification? Write its expression. What is its sign for thea) real…
  5. Write the spherical mirror formula and explain the meaning of each symbol used in it.…
Long Answer Type
  1. a) Draw ray diagrams to show how the image is formed, using a concave mirror when the…
  2. Explain with diagrams how refraction of incident light takes place froma) rarer to denser…
  3. State and verify laws of refraction using a glass slab.
  4. Draw a ray diagram to show the formation of image by a concave mirror for an object placed…
Numerical Problem
  1. The radius of curvature of a convex mirror is 40 cm. Find its focal length…
  2. An object of height 2 cm is placed at a distance 20 cm in front of a concave mirror of…
  3. A concave mirror produces three times magnified real image of an object placed at 7 cm in…
  4. Light enters from air into a glass plate having refractive index 1.5. What is the speed of…
  5. The speed of light in water is 2.25 × 108 ms-1. If the speed of light in vacuum is 3 × 108…

Multiple Choice Questions
Question 1.

The field of view * is maximum for ______________

(* FOV is the extent of the observable area that is seen at any given instant )

A. plane mirror

B. concave mirror

C. convex mirror


Answer:

The field of view is maximum for b)convex mirror because it always forms virtual ,erect .small sized image of object. That is the reason we use convex mirror in our vehicles.


(A) This is incorrect because –


plane mirror always form equal size image of object ,this is the reason we not prefer plan mirror for large field of view.


(B) This is incorrect because-


Concave mirror has small field of view then convex mirror .


Question 2.

When a ray of light passes from one medium to another medium, refraction takes place when angle of incidence is
A. 0°

B. 45°

C. 90°


Answer:

45 , if ray is travelling from lighter to denser medium then after refraction it bend towards the normal between the surfaces.



(a) If angle of incident is 0. Then the ray will go on its own path it will not show any deflection . so there is no refraction.


SEE the figure below to get an idea how ray will travel when angle of incident is zero.


So this option is incorrect



(c)As angle of incident is 90 , there is also no refraction.


Question 3.

__________ is used as reflectors in torchlight
A. concave mirror

B. convex mirror

C. plane mirror


Answer:

Because when the bulb of torchlight is placed at focus of concave mirror, it allows the light to spread out to infinity (longer distances).



(b)this is incorrect because


convex mirror always forms virtual images so we can not put light bulb on virtual position so we can’t use convex mirror in torch light.


(c)this is incorrect because –


plane mirror can not spread light falling on it so we not use it in torch light.


Question 4.

We can create enlarged, virtual images with
A. concave mirror

B. convex mirror

C. plane mirror


Answer:

 A virtual image formed by a concave mirror is always enlarged.


 When an object is placed between a concave mirror and its focal point, the image is virtual.


(b) This is incorrect because-


the convex mirror forms virtual images, but it is not enlarged.


(b) This is incorrect because-


Plane mirror always forms equal sized images.


Question 5.

When the reflecting surface is curved outwards the mirror formed will be
A. concave mirror

B. convex mirror

C. plane mirror


Answer:

(b)This incorrect because the concave mirror is curved inwards.


(c) this is incorrect because the plane mirror is plane.


Question 6.

The focal length of a concave mirror is 5cm. Its radius of curvature is
A. 5 cm

B. 10 cm

C. 2.5 cm


Answer:

Focal length of a mirror is given by the following formula.

f=R/2


Where R=radius of the mirror


So R=5× 2 = b)10 cm


(a)&(c) not have the value equal to 10cm so both are incorrect .


Question 7.

When a beam of white light passes through a prism it gets
A. Reflected

B. deviated and dispersed

C. only deviated


Answer:

When the light ray passes through prism its is deviated and dispersed due to refraction of light.


Option (a)&(c) are incorrect


Only (b) is correct


Question 8.

The speed of light is maximum in
A. vacuum

B. glass

C. diamond


Answer:

vacuum , the refractive index in vacuum is 1.


(b)&(c) is incorrect because the refractive index in both cases is higher then 1.


Question 9.

A real and enlarged image can be obtained by using a
A. convex mirror

B. plane mirror

C. concave mirror


Answer:

(b)This is incorrect because the plane mirror always form equal sized image .


(a) This is incorrect because convex mirror always forms virtual images .


Question 10.

Which of the following statements about total internal reflection is true?
A. angle of incidence should be greater than critical angle

B. light must travel from a medium of higher refractive index to a medium of lower refractive index

C. both (a) and (b)


Answer:

Because we know that Two important conditions for total internal reflection are:


• Angle of incidence (i) should be greater than critical angle (ic).


• Ray should travel from denser medium to rarer medium.



Cross Word Puzzle
Question 1.

Cross word puzzle



Across

2. Optical illusion due to refraction

4. A type of mirror that diverge the light rays

6. The nature of image formed when object is near the pole of concave mirror

7. Electromagnetic radiation visible to us

Down

1. The light ray sent back from a surface into the same medium

3. When magnification is negative, the nature of the image is ________

5. For concave mirror u and f are always __________


Answer:





Hots
Question 1.

Light ray emerges from water into air. Draw a ray diagram indicating the change in its path in water.


Answer:


There are three cases for a ray going from water to air ,these are


Clearly shown in the figure -


1) Normal refraction


2) Critical angle


3) Total internal reflection



Question 2.

When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?


Answer:


As clearly shown in the above when the ray of light from air is going into glass it will deviated from its path .as we known glass is denser then air, so according to the laws of refraction when light is travels from less dense medium to more dense medium it will bend towards the normal , that is the reason the angle of refraction become less then the angle of incident .


So , angle of refraction (r) < angle of incident(i)



Question 3.

What do you conclude about the speed of light in a diamond if you are told that the refractive index of diamond is 2.41?


Answer:

As we all know that



We also know that


Speed of light in a vacuum is = 3 × 108 ms-1


So,



Speed of light in diamond =1.244×108m/s




True Or False
Question 1.

The angle of deviation depends on the refractive index of the glass


Answer:

TRUE



Question 2.

If a ray of light passes obliquely from one medium to another, it does not suffer any deviation.


Answer:

FALSE


It will show deviation due to the difference between the REFRACTIVE INDEX of two medium.




Question 3.

If the object is at infinity in front of a convex mirror the image is formed at infinity.


Answer:

false

The image will form at principal focus , the image will be virtual and point sized.




Question 4.

An object is placed at distance of 3 cm from a plane mirror. The distance of the object and image is 3 cm.


Answer:

FALSE

THE distance between the plane mirror and object will be same as the distance between plane mirror and image . The distance between object and image will be 6 cm.




Question 5.

The convex mirror always produces a virtual, diminished and erect image of the object.


Answer:

TRUE



Question 6.

The distance from centre of curvature of the mirror to the pole is called the focal length of the mirror.


Answer:

false , its called the radius of curvature



Question 7.

When an object is at the centre of curvature of concave mirror the image formed will be virtual and erect.


Answer:

false

The image is at the centre of curvature itself. It is i) Real, ii) inverted and


iii) same size as the object.




Question 8.

Light is one of the slowest travelling energy with a speed of 3 × 10–8 ms-1


Answer:

false ,speed of light is fasted it is 3 × 108 ms-1



Question 9.

The angle of incidence at which the angle of refraction is 0° is called the critical angle.


Answer:

false , Critical angle has angle of incidence 90°.



Question 10.

The reason for brilliance of diamonds is mainly due to total internal reflection of light.


Answer:

True




Fill In The Blanks
Question 1.

In going from a rarer to denser medium, the ray of light bends _______


Answer:

In going from a rarer to denser medium, the ray of light bends _TOWARDS THE NORMAL



Question 2.

The ratio of sine of the angle of incidence to the sine of _______ is a constant.


Answer:

The ratio of sine of the angle of incidence to the sine of ANGLE OF REFRACTION is a constant.



Question 3.

The mirror used in search light is ______.


Answer:

The mirror used in search light is CONCAVE.



Question 4.

The angle of deviation of light ray in a prism depends on the angle of _____.


Answer:

The angle of deviation of light ray in a prism depends on the angle of PRISM.



Question 5.

The radius of curvature of a concave mirror whose focal length is 5cm is _____.


Answer:

The radius of curvature of a concave mirror whose focal length is 5cm is 10cm.



Question 6.

A spherical mirror whose reflecting surface is curved outwards is called ________mirror


Answer:

A spherical mirror whose reflecting surface is curved outwards is called CONVEX mirror



Question 7.

Large ________ mirrors are used to concentrate sunlight to produce heat in solar furnaces


Answer:

Large CONCAVE mirrors are used to concentrate sunlight to produce heat in solar furnaces



Question 8.

All distances parallel to the principal axis are measured from the ______ of the mirror


Answer:

All distances parallel to the principal axis are measured from the principal axis of the mirror



Question 9.

A negative sign in the value of magnification indicates that the image is _________.


Answer:

A negative sign in the value of magnification indicates that the image is REAL.



Question 10.

Light is refracted or bent while going from one medium to another because its _______ changes.


Answer:

Light is refracted or bent while going from one medium to another because its REFRACTIVE INDEX changes.




Match The Following
Question 1.

Match the following:



Answer:





Assertion And Reason Type
Question 1.

In the following questions, the statement of assertion is followed by a reason. Mark the correct choice as:

Assertion: For observing the traffic at a hairpin bend in mountain paths a plane mirror is preferred over convex mirror and concave mirror.

Reason: A convex mirror has a much larger field of view than a plane mirror or a concave mirror.

A. If both assertion and reason are true and reason is the correct explanation

B. If assertion is true but reason is false.

C. If assertion is false but reason is true.


Answer:

C) Assertion is false because –

CONVEX MIRROR IS USED INSTEAD OF PLANE MIRROR


Question 2.

In the following questions, the statement of assertion is followed by a reason. Mark the correct choice as:

Assertion: Incident ray is directed towards the centre of curvature of spherical mirror. After reflection it retraces its path.

Reason: Angle of incidence i = Angle of reflection r = 0o.

A. If both assertion and reason are true and reason is the correct explanation

B. If assertion is true but reason is false.

C. If assertion is false but reason is true.


Answer:

A)you can clearly see in the figure how ray will travel.



Very Short Answer Type
Question 1.

Give two examples of transparent medium that are denser than air.


Answer:

1) glass 2) water



Question 2.

According to cartesion sign convention, which mirror and which lens has negative focal length?


Answer:

According to Cartesian sign convention, object distances (u) are always negative as the object is placed to the left of the mirror/lens.

• Focal length (f) is positive for a convex lens and convex mirror.


• Focal length is negative for concave lens and concave mirror.
Image distance (v) can be both positive and negative for convex lens and concave mirror depending on the position of the object.


• Image distance is always negative for a concave lens.


• Image distance is always positive for a convex mirror.




Question 3.

A coin in a glass beaker appears to rise as the beaker is slowly filled with water, why?


Answer:

It happens due to the, phenomenon of refraction of light. When the rays of light from the coin, in the denser medium which is water, fall on the interface separating the two media, the rays of light move away from the normal after refraction. The point from which the refracted rays appear to come gives the apparent position of the coin. As the rays appear to come from a point above the coin, therefore, the coin appears some distance above the base of beaker.



Question 4.

Name the mirror(s) that can give (i) an erect and enlarged image, (ii) same sized, inverted image?


Answer:

(i) Concave mirror gives an erect and enlarged image of an object, when the object is between pole (P) and principal focus of mirror (F).


(ii) Concave mirror gives same sized and inverted image when object is place on centre of curvature of the mirror.




Question 5.

Name the spherical mirror(s) that has/have

i) Virtual principal focus

ii) Real principal focus


Answer:

1) convex mirror

2) Concave mirror




Question 6.

If an object is placed at the focus of a concave mirror, where is the image formed?


Answer:

If an object is placed at the focus of a concave mirror,then a large image appears at infinity . after reflection the rays meet at infinity .



Question 7.

Copy this figure in your answer book and show the direction of the light ray after reflection




Answer:

the ray will become pallarel to the principal axis.



Question 8.

Why does a ray of light bend when it travels from one medium to another?


Answer:

when a light ray travels from one medium to another, it shows some deviation from its path this phenomenon is called refraction of light.



Question 9.

What is the speed of light in a vacuum? Who first measured the speed of light?


Answer:

the speed of light in vaccum is 3 × 108 ms-1

It was the Danish astronomer, Olaus Roemer, who, in 1676, first successfully measured the speed of light. His method was based on observations of the eclipses of the moons of Jupiter (by Jupiter)



Question 10.

Concave mirrors are used by dentists to examine teeth. Why?


Answer:

Concave mirror produces virtual, erect and magnified images when a object is placed in between focus and pole. That’s the reason why dentists use concave mirror to examne teeth.




Short Answer Type
Question 1.

a) Complete the diagram to show how a concave mirror forms the image of the object.

b) What is the nature of the image?




Answer:

(a)


(b) When the object AB is placed between the centre of curvature and principal focus, then the ray AD going parallel to the principal axis and another ray AE passing through the principal focus F intersect each other at point A’ beyond the centre of curvature. Thus the image formed in this case is beyond C, enlarged, real and inverted.



Question 2.

Pick out the concave and convex mirrors from the following and tabulate them

Rear-view mirror, Dentist’s mirror, Torch-light mirror, Mirrors in shopping malls, Make-up mirror.


Answer:

concave mirror - Dentist’s mirror, Torch-light mirror , Make-up mirror.

Convex mirror - Rear-view mirror , Mirrors in shopping malls



Question 3.

State the direction of incident ray which after reflection from a spherical mirror retraces its path. Give reason for your answer.


Answer:

A ray of light passing through the centre of curvature of a concave mirror retraces its path (gets reflected along the same path), because as the ray of light passes through centre of curvature of a concave mirror it strikes the mirror along the normal and it incidences on to the mirror at 90 degree. Hence the incident ray coincides with the normal.


Therefore angle of incidence = 0 .As we know according to law of reflection angle of reflection = 0, hence the angle of reflection too become zero degree, thus ray of light retraces its path.




Question 4.

What is meant by magnification? Write its expression. What is its sign for the

a) real image

b) virtual image


Answer:

Magnification – magnification is defined as how many times bigger or smaller the image of the object formed by the spherical mirror.


It is defined as the ratio of the height of the image to the height of the object.


Let , height of the object = ho


Height of the image =hi


Then the magnification



Magnification can also be defined as ratio of object distance(u) and the image distance (v)



The sign will be


• negative for real image


• positive for virtual image



Question 5.

Write the spherical mirror formula and explain the meaning of each symbol used in it.


Answer:

The spherical mirror formula is the relation among the image distance ,object distance and focal length of the mirror .

If The image distance is = v


The object distance is = u


The focal length of mirror =f


Then the mirror formula will be –



The sign convention can be used as given in the figure –



We can see following things from the figure –


• Focal length (f) is positive for a convex lens and convex mirror.


• Focal length(f) is negative for concave lens and concave mirror.


• Image distance (v) can be both positive and negative for convex lens and concave mirror depending on the position of the object.


• Image distance(v) is always negative for a concave lens.


• Image distance(v) is always positive for a convex mirror.


• Object distance (u) is negative for convex as well as the concave mirror.




Long Answer Type
Question 1.

a) Draw ray diagrams to show how the image is formed, using a concave mirror when the position of object is i) at C ii) between C and F iii) between F and P of the mirror.

b) Mention in the diagram the position and nature of image in each case.


Answer:

(a)


• Image is inverted and same size


(b)



• Image is inverted , real and large in size


(c)



• Image will be Virtual and large in size



Question 2.

Explain with diagrams how refraction of incident light takes place from

a) rarer to denser medium

b) denser to rarer medium

c) normal to the surface separating the two media


Answer:

Refraction of light take place when light travels between two medium. As the speed of light is different in different medium that is the major factor for refraction of light .

(a)



As you can see in this figure the light is travelling from less dense medium to more dense medium ,its path is deviated ,this is because of refraction taking place between these two medium.


Whenever the light travels from less dense medium to more dense medium it will bend towards the normal to the surface.



As you can see in the diagram incident ray bends towards the normal axis .


In this case always incident angle I > r (angle of refraction)


(b)


when the ray of light travels from more dense medium to less dense medium it move away from the normal axis. As you can see in the following figure




Consider the figure above when light ray passes through the interface of two medium it will deviated from its path . in this case always


Angle of incident I < r (angle of refraction)


(c) when the light ray incident normally to the interface of two medium then it travels in same path , no deviation will be there. Because the angle of incident will be 0.


You can see this in following figure –




Question 3.

State and verify laws of refraction using a glass slab.


Answer:

There are two Laws of Refraction these are –


• The incident ray, the refracted ray and the normal to the surface at the point of incidence all lie in one plane.


• For any two given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant.


• The second law is called Snells Law after the scientist Willebrod Van Roijen Snell who first formulated it.
Thus, Sin i by Sin r (where the i is the angle of incident and r is the angle of refraction) is equal to a constant that is equal to μ where, mew is the refractive index of the second medium (R2) with respect to the first medium (R1).


Hence



There are the procedure how we can verify the laws of refraction-


• Place a rectangular glass slab on a white sheet of paper fixed to a drawing board.


• Trace the boundary A1B1C1D1 of the glass slab.


• Remove the glass slab.


• Draw IO to represent the incident ray.


• Draw the normal MN at the point of incidence O.


• Fix two pins P1 and Q1 on the incident ray IO.


• Place the glass slab within its boundary A1B1C1D1.


• Look in from the other side of the glass slab, fix two pins R1 and S1 such that the feet of all the pins are in one straight line.


• Remove the glass slab and the pins.


• Mark the pin points P1, Q1, R1 and S1.


• Join R1 S1 to represent the emergent ray O2 E.


• Join O1O2 . O1O2 dash is the refracted ray.



The incident ray, the refracted ray and the normal are all lying in the same plane. This proves the first law of refraction.



Measure and record the angle of incidence(i) and angle of refraction(r).
Repeat the experiment by varying the angle of incidence and Measure the corresponding angle of refraction.
Now find the ratio of the sine of the angle of incidence(i) to the sine of the angle of refraction(r).



The ratio of the sine of the angle of incidence to the sine of the angle of refraction is found to be the same in all the three cases.



This verifies the second law of refraction or Snells law that is sin i by sin r is equal to μ , a constant for a given pair of media.



Question 4.

Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and Principal focus and state three characteristics of the image.


Answer:


When an object is placed between the principal focus (F) of the mirror and the pole of the mirror (P) then the image of the object is become on the back side of the mirror ,


YOU can see the image formation in above figure ,where the object AB is placed between focus and pole of the mirror and the image of the object AB is formed other side of the mirror .


This image will be –


• Virtual


• Large then the image


• And erect.




Numerical Problem
Question 1.

The radius of curvature of a convex mirror is 40 cm. Find its focal length


Answer:

as we know focal length f = R/2

Given that radius of curvature R = 40cm


Then the focal length will be


f = R/2 =40/2 = 20cm.



Question 2.

An object of height 2 cm is placed at a distance 20 cm in front of a concave mirror of focal length 12 cm. Find the position, size and nature of the image.


Answer:

given that

Object height ho = 2 cm


Object distance u = -20cm (left side of mirror)


Focal length f = -12cm (concave mirror)


As we know mirror equation -





V= -30


As we know magnification is



Putting values in formula we get -



hi=3cm



Thus the image is 30cm from pole of mirror , its height will be 3 cm ,its real, inverted and magnified



Question 3.

A concave mirror produces three times magnified real image of an object placed at 7 cm in front of it. Where is the image located?


Answer:

Given that-

Object distance u = -7cm (left side of mirror)


Magnification m = 3


Image is real then the magnification formula become –



Putting values in formula we get -



V = 21cm


The image is located at 21 cm in front of mirror



Question 4.

Light enters from air into a glass plate having refractive index 1.5. What is the speed of light in glass? (Speed of light in vacuum is 3 × 108 ms-1)


Answer:

Given that –

Refractive index of glass =1.5


Speed of light in vacuum = 3 × 108 ms-1


As we know



So 


Speed of light in glass =2×108m/s



Question 5.

The speed of light in water is 2.25 × 108 ms-1. If the speed of light in vacuum is 3 × 108 ms-1, calculate the refractive index of water.


Answer:

Given that –

Speed of light in water is = 2.25 × 108 ms-1


Speed of light in vacuum = 3 × 108 ms-1


As we know



So



The refractive index of water =1.33


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(Std 12th English Medium)

HSC ECONOMICS MARCH 2020

HSC OCM MARCH 2020

HSC ACCOUNTS MARCH 2020

HSC S.P. MARCH 2020

HSC ENGLISH MARCH 2020

HSC HINDI MARCH 2020

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SSC Maharashtra Board Papers 2020

(Std 10th English Medium)

English MARCH 2020

HindI MARCH 2020

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Mathematics (Paper 1) MARCH 2020

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Sanskrit (Composite) MARCH 2020

Science (Paper 1) MARCH 2020

Science (Paper 2)

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