ICSE CLASS 10 CHEMISTRY FULL SYLLABUS YOUTUBE PLAYLIST

 ICSE CLASS 10 CHEMISTRY FULL SYLLABUS PLAYLIST

CLICK HERE FOR THE YOUTUBE LINK

List of all Basic Physics Formulas pdf Most Important Revision Cheat sheet Class 9 Class 10

List of all Basic Physics Formulas pdf 

Most Important Revision Cheat sheet 

Class 9 Class 10 

PDFLINK_CLICKHEREFORFORMULASHEET

VIDEO LINK

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ICSE CLASS 10 PHYSICS CHAPTERWISE YOUTUBE PLAYLISTS | NUMERICALS CONCEPTS

 ICSE CLASS 10 PHYSICS CHAPTERWISE YOUTUBE PLAYLISTs 

Chapter 1 Force

Chapter 2 Work, Energy and Power

Chapter 3 Machines

LIGHT 

This contains:

Chapter 4 Refraction of Light at Plane Surfaces

Chapter 5 Refraction through a Lens

Chapter 6 Spectrum

Chapter 7 Sound

CURRENT 

This contains:

Chapter 8 Current Electricity

Chapter 9 Household Circuits

Chapter 10 Electro-Magnetism

Chapter 11 Calorimetry 

Chapter 12 Radioactivity

TIPS TO SCORE WELL ICSE CLASS 10 COMPUTER APPLICATIONS

 TIPS TO SCORE WELL 

ICSE CLASS 10 COMPUTER APPLICATIONS

SYLLABUS / PASTPAPERS / SPECIMEN PAPER LINK 

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 HOW TO SOLVE SURDS CLASS 9 ICSE CBSE WORKSHEET WITH ANSWERS

 

 

 CLICKHEREFORPDF

 

 

 

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 CIRCLES CHAPTER 17_EX 17A SOLUTIONS

 

 hw: EX 17A - 1,2,3,4,5,78,9,10,13,14,15,1617,25 : 11 april'2022

 

 

 

CLICKHEREFORSOLUTIONS 

 PLAYLISTADDRESS:

 https://www.youtube.com/playlist?list=PLOHzPnwPA5loVvDi3pPwNxLUBjYWm-H0r

 

 

THESE ARE THE THEOREMS THAT WE DISCUSS HERE: 

THEOREM_1.The angle that an arc of a circle subtends at the centre is double that which it subtends at any point on the remaining part of the circle. 

THEOREM_2 Angles in the same segment of a circle are equal (without proof). 

THEOREM_3.Angle in a semi-circle is a right 

 THEOREM_4.Opposite angles of a cyclic quadrilateral are supplementary.

THEOREM_5.The exterior angle of a cyclic quadrilateral is equal to the opposite interior angle (without proof)

 TIMESTAMP 00:00 INTRO 17:24 THEOREM1 22:04 THEOREM2 33:24 THEOREM3 42:06 THEOREM4 48:51 THEOREM5 

 PDF LINK: https://isequaltoklassesnavneet.blogspot.com/2022/04/circles-chapter-17ex-17a-solutions.html 1. 

 

Concentric circles : Two or more circles are said to be concentric if they have same centre and different radii. In the adjoining figure, 0 is the centre of each circle drawn; so the circles are called concentric circles. 2. Equal circles : Circles are said to be equal or congruent if they have equal radii. 3. Circumscribed circle : A circle that passes through all the vertices of a polygon is called the circumscribed circle. The centre of circumscribed circle is called circumcentre and the polygon is called incribed polygon. See below : 4. Inscribed circle : A circle that touches all the sides of a polygon is called the inscribed circle j(or, in-circle) of the polygon. The centre of inscribed circle is called incentre and the polygon is called circumscribed polygon. 5. Chord : The line segment, joining any two points on the circumference of the circle, is called a chord. A chord, which passes through the centre of the circle is called diameter, and is the largest chord of the circle. Arc and its types : An arc is a part of the circumference of a circle. A chord divides the circumference of a circle into two parts and each part is called an arc. In the figure, given alongside, chord AB divides the circumference into two unequal arcs APB and AQB. The arc APB, which is less than the semi-circle, is called minor arc and the arc AQB, which is greater than the semi-circle, is called major arc. Segment and relation between arcs and segments : A segment is the part of a circle bounded by an arc and a chord. 

solutions good links

 https://www.brainkart.com/article/Deliquescence_39674/

 

https://www.brainkart.com/article/Hygroscopy_39673/

 

https://www.brainkart.com/article/Hydrated-salts-and-Water-of-Crystallization_39672/ 

Hydrated salts and Water of Crystallization
Hygroscopy
Deliquescence

 SELINA CHAPTER 25 SOLUTIONS_ EX 20B , 20C PROBABILITY

 NOTESPDF

 
 From a well-shuffled deck of 52 playing-cards, one card is drawn. Find the probability that the card drawn will :  (i) be a black card. (11) not be a red card. (111) be a red card.
(iv) be a face card. (v) be a face card of red colour.

 A card is drawn from a well-shuffled pack of 52 cards. Find the probability that the card
drawn is : (i) a spade. (ii) a red card. (iii) a face card. (iv) 5 of heart or diamond.
(v) Jack or queen. (vi) ace and king. (vii) a red and a king. (viii) a red or a King.
 
 A card is drawn from a pack of 52 cards. Find the probability that the card drawn is :
(i) a red card (ii) a black card (iii) a spade (iv) an ace (v) a black ace (vi) ace of diamonds
(vii) not a club (viii) a queen or a jack.

From a well-shuffled deck of 52 cards, one card is drawn. Find the probability that the
Card drawn Is : (i) a face card. (11) not a face card. (ii1) a queen of black colour.
(iv) a card with number 5 or 6. (v) a card with number less than 8. (vi) a card with number between 2 and 9.

All the three face cards of spades are removed from a well-shuffled pack of 52 cards. A card is then drawn at random from the remaining pack. Find the probability of getting :
(i) a black face card (i1) a queen (ili) a black card.

One card is drawn from a well-shuffled deck of 52 cards. Find the probability of getting :
(1) a queen of red colour. (ii) a black face card. (iii) the jack or the queen of hearts.
(iv) a diamond, (v) a diamond or a spade.

From a deck of 52 cards, all the face cards are removed and then the remaining cards are
shuffled. Now one card is drawn from the remaining deck. Find the probability that the
card drawn is : (i) a black card. (ii) 8 of red colour. (iii) a king of black colour.
 
Seven cards :- the eight, the nine, the ten, jack, queen, king and ace of diamonds are well
shuffled. One card is then picked up at random (i) What is the probability that the card
drawn is the eight or the king ? (ii) If the king is drawn and put aside, what is the probability that the second card picked up is :(a) an ace ? (b) a king ?
 
From a pack of 52 playing cards, all cards whose numbers are multiples of 3 are removed.
A card is now drawn at random. What is the probability that the card drawn is (i) a face card (King, Jack or Queen) (ii) an even numbered red card ?


 

CLASS 10 CHAPTER 13 SURFACE AREA VOLUME MATHS NCERT SOLUTIONS EX 13.5 EX13.3

 CLASS 10 CHAPTER 13 SURFACE AREA VOLUME MATHS NCERT CBSE SOLUTIONS EX 13.5 EX13.3

 

 

CHAP13_EX13.5_1. A copper wire, 3 mm in diameter, is wound about a cylinder whose length is 12 cm, and diameter 10 cm, so as to cover the curved surface of the cylinder. Find the length and
mass of the wire, assuming the density of copper to be 8.88 g per cm3

CHAP13_EX13.5_3. A cistern, internally measuring 150 cm × 120 cm × 110 cm, has 129600 cm3
 of water in it. Porous bricks are placed in the water until the cistern is full to the brim. Each brick absorbs one-seventeenth of its own volume of water. How many bricks can be put in
without overflowing the water, each brick being 22.5 cm × 7.5 cm × 6.5 cm?

CHAP13_EX13.5_4. In one fortnight of a given month, there was a rainfall of 10 cm in a river valley. If the area of the valley is 7280 km2, show that the total rainfall was approximately equivalent to the addition to the normal water of three rivers each 1072 km long, 75 m wide and 3 m deep.

CHAP13_EX13.3_7.A cylindrical bucket, 32 cm high and with radius of base 18 cm, is filled with sand. This bucket is emptied on the ground and a conical heap of sand is formed. If the height of the conical heap is 24 cm, find the radius and slant height of the heap.

CHAP13_EX13.3_8. Water in a canal, 6 m wide and 1.5 m deep, is flowing with a speed of 10 km/h. How much area will it irrigate in 30 minutes, if 8 cm of standing water is needed?

CHAP13_EX13.3_9. A farmer connects a pipe of internal diameter 20 cm from a canal into a cylindrical tank in her field, which is 10 m in diameter and 2 m deep. If water flows through the pipe at the rate of 3 km/h, in how much time will the tank be filled

CHAP13_EX13.3_Selvi’s house has an overhead tank in the shape of a cylinder. This
is filled by pumping water from a sump (an underground tank) which is in the
shape of a cuboid. The sump has dimensions 1.57 m × 1.44 m × 95cm. The
overhead tank has its radius 60 cm and height 95 cm. Find the height of the water
left in the sump after the overhead tank has been completely filled with water
from the sump which had been full. Compare the capacity of the tank with that of
the sump. (Use π = 3.14

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CONTACT process SULFURIC ACID Study of Compounds Notes Questions & Answers Class 10 ICSE

 PDFNOTES

 https://www.youtube.com/watch?v=w11F74O2uV8
03 Sulfuric Acid Mnufacturing Process



https://www.youtube.com/watch?v=_zj3bMjFclA
Sulfuric acid and the Contact process

 

CONC H2SO4 AS DEHYDRATING AGENT

 

WITH SUGAR

 

https://www.youtube.com/watch?v=xK4z_YhtTBM

Cool Science Experiment with Sugar and Sulfuric Acid

 

 

 

WITH CUSO4

https://www.youtube.com/watch?v=ONNkQkkphHw

 

Chemistry Demo : Heating Hydrated Copper Sulphate CuSO4.5H2O | Chemical reactions | Grade 7-10

 

 

 

IDENTIFICATION 

 

CONC H2SO4

 

DIL H2SO4

https://www.youtube.com/watch?v=AE94zICdyyE

Anion Test - Sulfate Ions

 

 OSTWALD process NITRIC ACID Study of Compounds Notes Questions & Answers Class 10 ICSE

 

notespdf

 

 

 

YOUTUBE VIDEOS
 

https://www.youtube.com/watch?v=066xkEEYS5g

Making Nitric Acid

 
https://www.youtube.com/watch?v=CpAS4H6gnSs
powerful Nitric Acid VS Lock
 
 
 https://www.youtube.com/watch?v=NlT2FwM7XSo
Difference between Deliquescence & Hygroscopicity
 
https://www.youtube.com/watch?v=FIxz7biiIG0
Nitric Acid


https://www.youtube.com/watch?v=3zbs0Y5fQ6Q
Ostwald Oxidation of Ammonia
 

https://www.youtube.com/watch?v=_QvY3JV2m-o
brown color of NO2

THERMAL DECOMPOSITION OF LEAD (II) NITRATE | CHEMISTRY DEMONSTRATION

https://www.youtube.com/watch?v=YooPJEOOFu0

hygroscopic salt demonstration

 Haber process Ammonia Study of Compounds Notes Questions & Answers Class 10 ICSE

 

CLICKHEREFORNOTESPDF 

 

usefulwebsites:

 

https://oec.world/en/profile/bilateral-product/ammonia/reporter/ind?redirect=true

 

https://en.wikipedia.org/wiki/Haber_process

 

https://www.energy.gov/eere/fuelcells/hydrogen-production-natural-gas-reforming

 

 https://nigen.com/how-separate-nitrogen-from-air-ways-extract-nitrogen/

 https://isequaltoklassesnavneet.blogspot.com/2022/03/identification-tests-ammonium.html

youtubevideos: 

https://www.youtube.com/watch?v=wiwl4eoHbig

Ammonia -  Royal Society Of Chemistry

 

 

https://www.youtube.com/watch?v=9P1iZBV-EKw

Making ammonia

 

 

https://www.youtube.com/watch?v=_4a9RTlAHEc

 EuroChem Group AG

 

https://www.youtube.com/watch?v=uaEFxQGzb-k 

Catalytic Oxidation of Ammonia

 

 

https://www.youtube.com/watch?v=6_jdjPTfHa0

Reducing Copper Oxide 

 

 

https://www.youtube.com/watch?v=X1BktOPsc7g

Ammonia fountain experiment

 

 https://www.youtube.com/watch?v=BH9TPJCV8uQ

Production of Ammonia (NH3) gas in Lab | Board Exam Experiment | Grade 10 | Chemistry

 

 ammonia burn
https://www.youtube.com/watch?v=n4ktAaGAyLc

 

 

 

 

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 extraction of aluminium  metallurgy class 10 icse notes  important questions and answers

 

 

 NOTESPDFLINK

 

 

 

 

GOOD WEBSITES:

 https://en.wikipedia.org/wiki/Hall%E2%80%93H%C3%A9roult_process

 

https://nalcoindia.com/business/operation/bauxite-mines/

 

https://rocksandminerals.com/MineralInformation/Aluminum/HowAluminumIsProcessed.html

 

https://www.gmdcltd.com/en/minerals-n-mines/bauxite

 

 GOOD YOUTUBE VIDEOS

 https://www.youtube.com/watch?v=WaSwimvCGA8

https://www.youtube.com/watch?v=aSx59lbc5cg&


https://www.youtube.com/watch?v=bI6OuGBx4nY


https://www.youtube.com/watch?v=1u8gzoT-seg


https://www.youtube.com/watch?v=KmMP67eC2tg


https://www.youtube.com/watch?v=hLoAo3mkOhg


https://www.youtube.com/watch?v=JBso28su0G4&

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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 WHAT ARE REDUCING AGENTS OXIDISING AGENTS - EASY ANALYSIS

 

 A reducing agent is a substance that reduces another substance by:

• giving hydrogen to the substance
• removing oxygen from the substance
• giving electrons to the substance

In the process of reducing another substance, the reducing agent itself becomes oxidised.

Common Reducing Agents are:

• Potassium iodide, KI (colourless solution)
• Reactive metals such as Mg, Zn, Al
  
• Hydrogen gas, H₂
• Carbon, C
• Carbon monoxide, CO
• Hydrogen sulfide, H₂S
• Sulfur dioxide, SO₂

Test for Oxidising Agent: Use of a Reducing Agent e.g. aqueous potassium iodide, KI(aq)  Observation: Colourless solution turns brown.

Chemistry behind it: 2I^–(aq) => I₂(aq) + 2e^–

^{******************************************************************************************************}

An oxidising agent is a substance that oxidises another substance by

• giving oxygen to the substance
• removing hydrogen from the substance
• receiving electrons to the substance

In the process of oxidising another substance, the oxidising agent itself becomes reduced

Common Oxidising Agents are:

• Acidified potassium manganate (VII), KMnO₄ (purple solution)
• Acidified potassium dichromate (VI), K₂Cr₂O₇ (orange solution)
• Halogens e.g. Cl₂, Br₂
• Concentrated Sulfuric acid, H₂SO₄
• Nitric acid, HNO₃
• Oxygen, O₂

Test for Reducing Agent: Use of an Oxidising Agent e.g. acidified potassium manganate (VII). Observation: Purple solution decolourises.

Chemistry behind it: MnO₄^–(aq) + 8H⁺(aq) + 5e^– => Mn²⁺(aq) + 4H₂O(l)

USEFULNOTES_PDF

 

 

 SHORT STORIES - CLASS 10 ICSE - ENGLISH 1 - SAMPLE

 

Write an original story. Short story entitled - The Secret

Write an original short story entitled- The Narrow Escape

Write an original short story entitled - man is often ruined by his pride.

Write an original short story entitled - escaped.

Write an original short story, entitled - lost and found.

Write an original short story entitled- My sanity was restored.

Write an original short story entitled - regret, but too late to repent.

Write an original short story entitled- The Gift

Write an original short story entitled - I want, but don't always get.

I'll write an original short story entitled - The Hand That Rocks the Cradle rules the world.

Write an original short story based on a joint family.

Write an original short story entitled - self-help is the best help.

Write an original short story beginning with - one cold Frosty morning in the lonely island...

Write an original short story, which has the following characters - a capseller, a passerby, a stray dog, a mad man and a dwarf. 

 

SELINA CHAPTER 20 SOLUTIONS_ EX 20B , 20E , 20F , 20G _MENSURATION 

CLICKHEREFORNOTESPDF

EXERCISE 20(B)
    
   10. A solid cone of height 8 cm and base radius
     6 cm is melted and recast into identical cones,
     each of height 2 cm and diameter 1 cm. Find
     the number of cones formed.

    11. The total surface area of a right circular cone of slant height 13 cm is 90 pi cm2.
Calculate :
      i) its radius in cm.
     (ii) its volume in cm3. [Take = 3-14] .

 
    13. A vessel, in the form of an inverted cone, is
      filled with water to the brim. Its height is
      32 cm and diameter of the base is 25-2 cm.
      Six equal solid cones are dropped in it, s
      that they are fully submerged. As a result,
     one-fourth of water in the original cone
      overflows. What is the volume of each of the
      solid cones submerged ?

   '14 The volume of a conical tent is 1232 M3 and
     the area of the base floor is 154 m2. Calculate
      the
      (i) radius of the floor,
      (ii) height of the tent,
      (iii) length of the canvas required to cover this conical tent if its width is 2 m.
     

EXERCISE 20 D

10. A solid metallic cone, with radius
  6 cm and height 10 cm, is made of
  some heavy metal A. In order to
  reduce its weight, a conical hole is
made in the cone as shown and it
  is completely filled with a lighter metal. THE
  conical hole has a diameter of 6 cm and depth
   cm. Calculate the ratio of the volume of metal
  A to THE volume of the metal B in the solid.

EXERCISE 20(E)


              3. From a rectangular solid of metal 42 cm by
                           30 cm by 20 cm, a conical cavity of diameter
                      14 cm and depth 24 cm is drilled out. Find :

                     (1) the surface area of remaining solid,
                       (ii) the volume of remaining solid,
                     (iii) the weight of the material drilled out
                             weighs 7 gm per cm^3.                                    


EXERCISE 20(F)


4. A circus tent is cylindrical to a height of 8 m
  surmounted by a conical part. If total height
  of the tent is 13 m and the diameter of its base
  is 24 m; calculate
   i) total surface area of the tent,8.
  (ii) area of canvas, required to make this tent
     allowing 10% of the canvas used for folds
     and stitching.

7. A wooden toy is in the shape of
  a cone mounted on a cylinder as
  shown alongside.
  If the height of the cone is 24 cm,
  the total height of the toy is 60 cm
  and the radius of the base of the
  cone = twice the radius of the base of the cylinder
  = 10 cm: find the total surface area of the toy.
  [Take pi= 3-14]

13.                        An open cylindrical vessel of internal diameter
                               cm and height 8 cm stands on a horizontal
                         table. Inside this is placed a solid metallic right
                         circular cone. the diameter of whose base is
                                       cm and height 8 cm. Find the volume of
                         water required to fill the vessel.
                         If this cone is replaced by another cone,
                          whose height is 1 3/4 cm and the radius of whose
                     base is 2 cm, find the drop in the water level.


EXERCISE 20(F)

7. An iron pole consisting of a cylindrical portion
   110 cm high and of base diameter 12 cm is
  surmounted by a cone 9 cm high. Find
      the mass of the pole, given that 1 cm^3 of iron
has 8 gm of mass (approx). (Take pi=355/113)

10. A cylindrical water tank of diameter 2.8 m and
  height 4.2 m is being fed by a pipe of
  diameter 7 cm through which water flows at
  the rate of 4 m/s . Calculate, in minutes, the
  time it takes to fill the tank.

11. Water flows, at 9 km per hour, through a
  cylindrical pipe of cross-sectional area 25 cm^2.
  If this water is collected into a rectangular
  cistern of dimensions 7.5 m by 5 m by 4 m;
  calculate the rise in level in the cistern in
 1 hour 15 minutes.


  15. An exhibition tent is in the form of a cylinder   surmounted by a cone.
The height of the tent
   surmounted by a cone. The height of the tent
    above the ground is 85 m and height of the
    cylindrical part is 50 m. If the diameter of the  
  base is 168 m, find the quantity of canvas
    base is 168 m, find the quantity of canvas
    required to make the tent. Allow 20% extra for
    fold and for stitching. Give your answer to the
    nearest m^2.       [2001]


         20. A conical tent is to accomodate 77 persons.
             Each person must have 16m^3 of air to
             breathe. Given the radius of th ent as 7 m,
is total     find the height of the tent and also its curved
             surface area.                   

 PROBABILITY BASICS_  SOLVED NUMERICALS _ WORKSHEET _ NOTES _ PDF

 

CLICKHEREFORALLNOTES 

 

 

 

 ALUMINA EXTRACTION - GOOD VIDEOS LIST

 

https://www.youtube.com/watch?v=KmMP67eC2tg 

How Are Aluminium Cans Recycled? | How Do They Do It?

 

https://www.youtube.com/watch?v=1u8gzoT-seg

How It's Made - Aluminium or Aluminum

 

https://www.youtube.com/watch?v=bI6OuGBx4nY  

Extraction of Aluminium

 

https://www.youtube.com/watch?v=WaSwimvCGA8

Aluminium Extraction - Royal Society of Chemistry

 

 

 

 

 

 CHAPTER 20 CYLINDER CONES CONCISE MATHEMATICS SELINA SOLUTIONS EX 20 B

 

Q11. Find the area of the canvas required to make a conical tent 14 m high and 96 m in diameter. Given that : (i) 20% of the canvas is used in folds and stitching. (ii) canvas used in folds and stitching is 20% of the curved surface area of the tent.  

 

Q10. A vessel, in the form of an inverted cone, is filled with water to the brim. Its height is 20 cm and diameter is 16.8 cm. Two equal solid cones are dropped in it so that they are fully submerged. As a result, one-third of the water in the original cone overflows. What is the volume of each of the solid cones submerged ? 

 

Q8. The ratio of the base area and the curved surface area of a conical tent is 40 : 41. If its height is 18 m, find the air capacity of the tent in terms of π.

 

 

 

 

 CHAPTER 20 CYLINDER, CONES | CONCISE MATHEMATICS | SELINA SOLUTIONS | EX 20 A

 

 SOLUTIONS_PDF_LINK

 

 EX20A Q3. A cylinder of circumference 8 cm and length
 21 cm rolls without sliding for 41 seconds at
 the rate of 9 complete rounds per second.
 Find
 (i) the distance traveled by the cylinder in
   4-1/2 seconds, and
 (ii) the area covered by the cylinder in 4
   seconds.

 

 EX20A Q8. A cylindrical container with diameter of base 42 cm contains sufficient water to submerge a  rectangular solid of iron with dimensions   22 cm x 14 cm x 10.5 cm. Find the rise in the level of the water when the solid is sub-merged.


 EX20A Q14. Find the minimum length in cm and correct to
  nearest whole number of the thin metal sheet
  required to make a hollow and closed cylindrical
  box of diameter 20 cm and height 35 cm.
  Given that the width of the metal sheet is I m.
  Also, find the cost of the sheet at the rate of
   56 per m.
  Find the area of metal sheet required, if 10% of it   is wasted in cutting, overlapping, etc.

 

 

 EX20A Q10. Find the total surface area of an open pipe of
    length 50 cm, external diameter 20 cm and
    internal diameter 6 cm.

 EX20A Q11. The height and the radius of the base of a
    cylinder are in the ratio 3: 1. If its volume
    is 1029 cm^3; find its total surface area.

 EX20A Q12. The radius of a solid right circular cylinder
    increases by 20% and its height decreases by
    20%. Find the percentage change in its
    volume.


 EX20A Q15. 3080 cm^3 of water is required to fill a
  cylindrical vessel completely and 2310 cm^3 of
  water is required to fill it upto 5 cm below the  top. 

Find :
  (i) radius of the vessel.
  (ii) height of the vessel.
  (iii) wetted surface area of the vessel when it is half-filled with water.

EX20A Q18. A circular tank of diameter 2 m is dug and the  earth removed is spread uniformly all around
   the tank to form an embankment 2 m in width
  and 1.6 m in height. Find the depth of the
  circular tank.

 EX20A Q21. The sum of the height and the radius of a solid   cylinder is 35 cm and its total surface area is   cylinder is 35 cm and its total surface area is   3080 cm^2; find the volume of the cylinder.

 EX20A Q22. The total surface area of a solid cylinder is
  616 cm^2. If the ratio between its curved
  surface area and total surface area is 1:2;
  find the volume of the cylinder.

 EX20A Q23. A cylindrical vessel of height 24 cm and
  diameter 40 cm is full of water. Find the exact
  number of small cylindrical bottles, each of
  height 10 cm and diameter 8 cm, which can
  be filled with this water.

 EX20A Q24. Two solid cylinders, one with diameter 60 cm
  and height 30 cm and the other with radius 30
  cm and height 60 cm, are melted and masted
  into a third solid cylinder of height 10 cm.
  Find the diameter of the cylinder formed.

 EX20A Q25. The total surface area of a hollow cylinder,
  which is open from both the sides, is 3575
  cm^2; area of its base ring is 357.5 cm^2 and its
  height is 14 cm. Find the thickness of the
  cylinder.

 EX20A Q28. A closed cylindrical tank, made of thin iron-   sheet, has diameter = 8.4 m and height 54 m.
  How much metal sheet, to the nearest m^2, is
  used in making this tank, if 1/15 of the sheet
  actually used was wasted in making the tank ?