Ohms law numericals

OHMS LAW
1.definition
potential applied is directly proportional to current flowing in a conductor
2.V ∝ i
3,v=ir
removing proportinality constant keep a constant r
4.drawing graph between v and i we get a staright line passing through origin
5.straight line is called slope
6.slope of vi graph is called resistance
7 substances which obey ohms law are ohmice conductors
examples many metals
8.substances which do not obey ohms law are non ohmic conductors
example.transistor diode,filament,led,
9.for ohmic conductors graph is straight line
and non ohmic graph wont be straight line
10.least count of ammeter or voltmeter
formula is
least  ount= reading/divisions
11.instument which has less least counts t is best instrument

Ohm’s Law Applications

The main applications of Ohm’s law are:

To determine the voltage, resistance or current of an electric circuit.

Ohm’s law is used to maintain the desired voltage drop across the electronic components.

Ohm’s law is also used in DC ammeter and other DC shunts to divert the current.

Limitations of Ohm’s Law

Following are the limitations of Ohm’s law:

Ohm’s law is not applicable for unilateral electrical elements like diodes and transistors as they allow the current to flow through in one direction only.

For non-linear electrical elements with parameters like capacitance, resistance etc the voltage and current won’t be constant with respect to time making it difficult to use Ohm’s law.

When does Ohm’s law fail?

Ohm’s law fails to explain the behaviour of semiconductors and unilateral devices such as diodes. Ohm’s law may not give the desired results if the physical conditions such as temperature or pressure are not kept constant.

Worksheet for practice

1.find potential when current of 3 mA flows across a resistance of 1000ohms ?
2.find potential when 5 c of charge flows for 2 secs across a resistance of 4 ohms?
3.find resistance when a current of 5 amp flows across a p d of 110v?
4.find potential when 10 power 19 electrons flow for 10 seconds acoss a resistance of 12ohms?
5.find current flowing in a conductor when potential of 220v applied across a resistance of 12ohms?
6.find resistance when slope makes an angle of 30 degrees alon x axis in x y plane?
7.what happens to current if potential applied is reduced to half or doubled?
8.what potential is applied in india ?
9.what is source of potential in circuit?
10.what is use of neutral wire in along with live wire?
11.what is difference between potential and potential difference?
12.what is work done if 10 col of charge flows and 5 milli amp of current flows across 100 ohms resistance?
13.what is work done if 10 power 20 electrons flows across carrying 5 milli ampere a over 1000 ohms resistance?
14.Give an example of non-ohmic devices
Ans is transistors and diodes
15.what is slope of v-i graph gives .What is conductance and its units?
16.what instrument is used to measure resistance and how do you denote it?
17.The values of currents flowing through a given resistor of resistance R for corresponding values of potential differences v across the resistors are given below
0.5v - 1 amp
1v - 0.2 amp
1.5v - 0.3 amp
2v - 0.4 amp
2.5 v - 0 5 amp
3v - 0.6 amp
4 v - 0.8 amp
5v - 1 amp
Plot a graph between v and I and determine the reistance
18.What would you suggest to a student if while performing an experiment if while performing a experiment the pointer needle of ammeter and voltmeter do not coincide with the zero mark on the scale when circuit is open.and there is no extra ammeter and voltmeter is available in the laboratory

19.Calculate the resistance if 5 A of electric current flows through a conductor having potential difference between two points is equal to 15 V.

20.If the potential difference between the terminals of an electric motor is 220 V and an electric current of 5 A is flowing through it what will be the resistance of electric motor

21.An electric current of 15 A is flowing through an electric fan. If the potential difference between two terminals of electric fan is 240 V, what will be resistance?

22.If the resistance of an electric iron is 48 Ω and an electric current of 5 A is flowing through it, what will be the potential difference between two terminals of electric iron.

23.Calculate the potential difference between two points of a terminal, if an electric current of 10 A is flowing through it having resistance of 20Ω.

24.If the resistance between two terminals of an electric heater is 15Ω and an electric current of 15 A is flowing through it then what will be the voltage of electric current?

25.0.6A current flows through a resistor shown in figure. Voltage of two points of resistor is 12V. What is the resistance of the resistor?

26 Resistance of an electric iron 50 Ω.4.2A Current flows through the resistance. Find the voltage between two points.

27.Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 Ω resistor, an 8 Ω resistor, and a 12 Ω resistor, and a plug key, all connected in series.

28.cell is connected to a bulb which develops a potential difference of 24 volts across it. The current in the circuit is measured to be 4 A. Find the resistance offered by the filament of the bulb to the flow of the current.

29. Calculate the potential difference across the ends of a wire of resistance 1 ohm when a current of 3 A passes through it.

30 Calculate the current flowing through a wire of resistance 15 ohm connected to a battery of potential difference 3 volt.

31.cell of potential difference 12 V is connected to a bulb. The resistance of the filament of the bulb when it glows is 24 ohm. Find the current drawn from the cell.

32. A bulb draws current 1.5 A at 6 V. Find the resistance of filament of bulb while glowing?

33. A current 0.2 A flows in a wire of resistance 15 ohm. Find the potential difference across the ends of the wire.

34.When a 24 V battery is connected to a resistor, the current in it is 0.4 A. What is the resistance of the resistor? What would be the current through it when it is connected to a battery of 6 V?

35.R1 = 10 ohm and R2 = 5 ohm in the diagram. Cell voltage is 7.5 V

Find out (a)the equivalent resistance (b) the electric current (c) the potential difference across each resistor in the circuit shown in figure (1).

36. Two resistances of 6 ohm and 12 ohm are connected in parallel. Calculate the equivalent resistance.

37.. On 1 ohm resistor is connected in parallel to a 11 ohm resistor. What is equivalent resistance?

38.Two resistors of resistances R1 =10 ohm and R2= 20 ohm are connected in parallel. A battery supplies 6 A of current to this resistance combination as shown in figure 2. Calculate the current in each resistor.

39.. A uniform wire of resistance R is cut into two equal pieces, and these pieces are joined in parallel. What is the resistance of the combination?

40. How will you join the resistors of resistances 3 ohm, 6 ohm and 8 ohm to get an equivalent resistance of 10 ohm?

41. 3 resistors, each of resistance 12 ohm, are connected in parallel. What is the equivalent resistance?

42..In the following circuit, R1 = 15 ohm and R2=30 ohm.(a) The equivalent resistance (b)The current passing the cell and, (c) the current passing through the 30 ohm resistor in the circuit shown above.

43. R1 = 20 ohm and R2 = 15 ohm in the circuit shown in figure 4 below.
The battery cell provides 7 V.
Find the current through the circuit. Also find the potential difference across the 20 ohm resistor.

44. A metal wire of resistance 6 ohm is stretched so that its length is increased to twice its original length. Calculate its new resistance.

45. How is the resistance of a wire affected if its (a) length is doubled. (b) radius is doubled? (c) length and radius both are doubled

46. What is the current in milliamperes produced by the solar cells of a pocket calculator through which 5.00 C of charge passes in 5.00 h?

47. A total of 1200 C of charge passes through a flashlight in 1 h. What is the average current?

48.What is the current when a typical static charge of 0.125 μC moves from your finger to a metal doorknob in 0.5 μs ?

49.Find the current when 2.00 nC jumps between your comb and hair over a 0.500 – μs time interval.

50. A large lightning bolt had a 20,000-A current and moved 30.0 C of charge. What was its duration?

51.The 200-A current through a spark plug moves 0.300 mC of charge. How long does the spark last?

52.the resistance of an electric iron is 50 Ω and a current of 3.2 A flows through the resistance. Find the voltage between two points.

53.An EMF source of 8.0 V is connected to a purely resistive electrical appliance (a light bulb). An electric current of 2.0 A flows through it. Consider the conducting wires to be resistance-free. Calculate the resistance offered by the electrical appliance.

54.

light numericals

Q.1. A convex lens of focal length 10 cm is placed at a distance of 12 cm from a wall. How far from the lens should an object be placed so as to form its real image on the wall?

Answer

Q.2. If an object of 7 cm height is placed at a distance of 12 cm from a convex lens of focal length 8 cm, find the position, nature and height of the image.

Answer

Q.3. An object 4 cm high is placed at a distance of 10cm from a convex lens of focal length 20cm. Find the position, nature and size of the image.

Answer

Q.4. A small object is so placed in front of a convex lens of 5 cm focal length that a virtual image is formed at a distance of 25 cm. Find the magnification.

Answer

Q.5. Find the position and nature of the image of an object 5 cm high and 10 cm in front of a convex lens of focal length 6 cm.

Answer

Q.6. Calculate the focal length of a convex lens, which produces a virtual image at a distance of 50 cm of an object placed 20 cm in front of it.

Answer

Q.7. An object is placed at a distance of 100 cm from a converging lens of focal length 40 cm. What is the nature and position of the image?

Answer

Q.8. A convex lens produces an inverted image magnified three times of an object at a distance of 15 cm from it. Calculate focal length of the lens.

Answer

Q.9. An object placed 4 cm in front of a converging lens produces a real image 12 cm from the lens. What is the magnification of the image? What is the focal length of the lens? Also draw the ray diagram to show the formation of the image.

Answer

Q.10. A lens of focal length 20 cm is used to produce a ten times magnified image of a film slide on a screen. How far must the slide be placed from the lens?

Answer

Q.11. Determine how far an object must be placed in front of a converging lens of focal length 10 cm in order to produce an erect image of linear magnification 4.

Answer

Q.12. A convex lens of focal length 6 cm is held 4 cm from a newspaper, which has print 0.5 cm high. By calculation, determine the size and nature of the image produced.

Answer

Q.13. A convex lens of focal length 0.10 m is used to form a magnified image of an object of height 5 mm placed at a distance of 0.08 m from the lens. Find the position, nature and size of the image.

Answer

Q.14. An erect image 2 cm high is formed 12 cm from a lens, the object being 0.5 cm high. Find the focal length of the lens.

Answer

Q.15. The filament of a lamp is 80 cm from a screen and a converging lens forms an image of it on a screen, magnified three times. Find the distance of the lens from the filament and the focal length of the lens.

Answer

Q.16. An object 2 cm tall is placed on the axis of a convex lens of focal length 5 cm at a distance of 10 cm from the optical centre of the lens. Find the nature, position and size of the image formed. Which case of image formation by convex lenses is illustrated by this example?

Answer

Q.17. A converging lens of focal length 5 cm is placed at a distance of 20 cm from a screen. How far from the lens should an object be placed so as to form its real image on the screen?

Answer

Q.18. An object 5 cm high is held 25 cm away from a converging lens of focal length 10 cm. Find the position, size and nature of the image formed. Also draw the ray diagram.

Answer

Q.19. At what distance should an object be placed from a convex lens of focal length 18 cm to obtain an image at 24 cm from it on the other side? What will be the magnification produced in this case?

Answer

Q.20. The magnification produced by a spherical lens is +2.5. What is the nature of image and lens?

Answer

Q.21. What is the nature of the image formed by a convex lens if the magnification produced by a convex lens is +3?

Answer

Q.22. What is the nature of the image formed by a convex lens if the magnification produced by a convex lens is –0.5?

Answer

Q.23. What is the position of image when an object is placed at a distance of 10 cm from a convex lens of focal length 10 cm?

Answer

Q.24. Describe the nature of the image formed when an object is placed at a distance of 30 cm from a convex lens of focal length 15 cm.

Answer

Q.25. At what distance from a converging lens of focal length 12 cm must an object be placed in order that an image of magnification 1 will be produced?

Answer

Problems on concave lens:

Q.26. A concave lens produces an image 20 cm from the lens of an object placed 30 cm from the lens. Calculate the focal length of the lens.

Answer

Q.27. The magnification of a spherical lens is +0.5. What is the nature of lens and image?

Answer

Q.28. If an object is placed at a distance of 50 cm from a concave lens of focal length 20 cm, find the position, nature and height of the image.

Answer

Q.29. An object is placed at a distance of 4 cm from a concave lens of focal length 12 cm. Find the position and nature of the image.

Answer

Q.30. An object is placed at a distance of 50 cm from a concave lens produces a virtual image at a distance of 10 cm in front of the lens. Draw a diagram to show the formation of image. Calculate focal length of the lens and magnification produced.

Answer

Q.31. A 50 cm tall object is at a very large distance from a diverging lens. A virtual, erect and diminished image of the object is formed at a distance of 20 cm in front of the lens. How much is the focal length of the lens?

Answer

Q.32. A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

Answer

Q.33. An object 60 cm from a lens gives a virtual image at a distance of 20 cm in front of the lens. What is the focal length of the lens? Is the lens converging or diverging? Give reasons for your answer.

Answer

Q.34. A concave lens of 20 cm focal length forms an image 15 cm from the lens. Compute the object distance.

Answer

Q.35. A concave lens has focal length 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Also find the magnification produced by the lens.

Answer

Q.36. Calculate the image distance for an object of height 12 mm at a distance of 0.20 m from a concave lens of focal length 0.30 m and state the nature and size of the image.

Answer

Q.37. A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? Also calculate the size of the image formed.

Answer

Q.38. An object is placed 20 cm from (a) a converging lens and (b) a diverging lens of focal length 15 cm. Calculate the image position and magnification in each case.

Answer

Q.39. A 2.0 cm tall object is placed 40 cm from a diverging lens of focal length 15 cm. Find the position and size of the image.

Answer

Q.40. Find the position and size of the virtual image formed when an object 2 cm tall is placed 20 cm from (a) diverging lens of focal length 40 cm and (b) converging lens of focal length 40 cm.

Answer

Q.41. The magnification produced by a spherical lens is +0.75. What is the nature of image and lens?

Answer

Q.42. The magnification produced by a spherical lens and a spherical mirror is +0.8. What is the nature of lens and mirror?

Answer

Q.43. The magnification produced by a spherical lens and a spherical mirror is +2.0. What is the nature of lens and mirror?

Answer

Q.44. The lens A produces a magnification of –0.6 whereas lens B produces magnification of +0.6. What is the nature of lens A and B.

Answer

Q.45. An object is 2 m from a lens which forms an erect image one-fourth (exactly) the size of the object. Determine the focal length of the lens. What type of the lens is this?


Determine the speed of light in diamond if the refractive index of diamond with respect to vacuum is 2.42. Speed of light in vacuum is 3×1083×108m/s.
(ii) Refractive indices of glass, water and carbon disulphide are 1.5, 1.33 and 1.62 respectively. If a ray of light is incident in these media at the same angle (say θ�), then write the increasing order of the angle of refraction in these media.
(iii) (A) The speed of light in glass is 2×1082×108 m/s and in water is 2.25×1082.25×108 m/s.
(a) Which one of the two is optically denser and why ?
(b) A ray of light is incident normally at the water-glass interface when it enters a thick glass container filled with water. What will happen to the path of the ray after entering the glass ? Give reason.
(iv) (B) The absolute refractive indices of water and glass are 4/3 and 3/2 respectively. If the speed of light in glass is 2×1082×108 m/s, find the speed of light in (i) vacuum and (ii) water.


. A concave mirror has a focal length of 20 cm. At what distance from the mirror should a 4 cm tall object be placed so that it forms an image at a distance of 30 cm from the mirror? Also calculate the size of the image formed.

Q.2. (a) Water has refractive index 1.33 and alcohol has refractive index 1.36. Which of the two medium is optically denser? Give reason for your answer.

(b) Draw a ray diagram to show the path of a ray of light passing obliquely from water to alcohol.

(c) State the relationship between angle of incidence and angle of refraction in the above case. 

Q.3. Three mirrors, one plane, one concave and one convex are lying on the table. identify them without touching them or using any other apparatus or device? 

Q.4. A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in closed contact with each other. Calculate the lens power of the combination.

Q.5. An object is placed at a distance of 12 cm in front of a concave mirror of radius ofcurvature 30 cm. List four characteristics of the image formed by the mirror

Q.6. A convex lens of focal length 2.0 m can produce a magnified virtual as well as real image. Is this a correct statement? If yes, where shall the object be placed in each case for obtaining these images?

Q.7. “The magnification produced by a spherical mirror is -3”. List all information you obtain from this statement about the mirror/ image.

LONG ANSWER TYPE QUESTIONS (4 MARKS)

Q.1. (i) A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

(ii) A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

Q.2. (a) A 5 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. Find the position, nature and size of the image formed.

(b) Draw a labelled ray diagram showing object distance, image distance and focal length in the above case.






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a^2-b^2 identity sums practice

Electromagnetism Worksheet for 10th class

Magnetism Worksheet

1.Name the type of current. (a) used in household supply (b) given in cell (CBSE (CCE) 2011)

2.  Name the physical quantities of electromagnetic induction. (CBSE (CCE) 2012)

3.  Give one application of electromagnetic induction. (CBSE (CCE) 2012)

4.  Name any two appliances which are based on the application of heating effect of electric current. (AI 2009C)

5.  What constitutes the field of a magnet? (DELHI 2006)

6.  A compass needle is placed near a curtp for the following cases, and give reason for the same in each case.

a. Magnitude of electric current in the wire is increased

b. The compass needle is displayed away from the wire. (CBSE (CCE) 2012)

7.  Explain the role of fuse in series with any electrical appliance in an electric circuit. Why should a fuse with defined rating for an electric circuit not be replaced by one with a larger rating? (CBSE (CCE) 2011)

8.  What is meant by the term frequency of an alternating current? What is the value in India? Why is an alternating current considered to be advantageous over direct current for long range transmission of electric energy? (CBSE SAMPLE PAPER 2009)

9.  What is an electromagnet? Draw a circuit diagram to show how a soft iron piece can be transformed into electromagnet. (DELHI 2008)

10.  With the help of neat diagram describe how you can generate induced current in the circuit. (DELHI 2006C)

11.  a. Mention effect of electric current on which the working of an electrical fuse is based.

          b. Draw a schematic labeled diagram of a domestic circuit which has a provision of a main base, meter, one light bulb and a socket.

          c. Explain the term overloading of an electric circuit. (CBSE (CCE) 2012)

12.  a. Describe an activity to demonstrate the pattern of magnetic field lines around a straight conductor carrying current.

          b. State the rule to find the direction of magnetic field associated with a current carrying conductor?

          c. What is the shape of a current carrying conductor whose magnetic field pattern

......

State the rule that is used to find the direction of field acting at a point near a current carrying straight conductor.

Q2. Distinguish between Permanent magnet and Temporary magnet

Q3. What are the factors on which the magnetic field due to a current carrying solenoid depends?

Q4. Write any 3 methods of demagnetising a permanent magnet ?

Q5. What is an electromagnet?. How does it differ from a permanent magnet ? State three factors on which the strength of an electromagnet depends.

Q6. A proton is moving with velocity 104 m/s parallel to the magnetic field of intensity 5T. Find he force on the proton

Q7. Mentions the angle between a current carryings conductor and magnetic field for which the force experienced by fair current carrying conduct is the magnetic field the larger.

Q8. Explain the function of fuse in a domestic electric circuit? An electric oven having power rating 2000 W, 220 V is used in an electric circuit having a fuse of 5A rating. What is likely to happen when the oven is switched on? Explain

Q9. Write one difference between direct current and alternating current. Which one of the two is mostly produced at power stations in our country? Name one device which provides alternating current. State one important advantage of using alternating current.

Q10. Can two magnetic lines of force intersect each other? Give reasons in support of your answer.

Q8. If a soft iron piece is buried under the surface of earth in the north and south direction, then:

• It will acquire properties of a magnet

• Its properties will not change

• It will behave like an insulator

• Can’t say with surety

Q9. Force acting on a stationary charge Q in the magnetic field B is:

• BQV

• BV/Q

• Zero

• BQ/V

Q10. A wire of length ‘ℓ’ is placed in a magnetic field B. If the current in the wire is I, then maximum magnetic force on the wire is:

• BI ℓ

• B/Iℓ

• Iℓ /B

• I/Bℓ

Section 2 - Subjective

Question 1 How can you show that the magnetic field produced by a given electric current in the wire decreases as the distance from the wire increases?

Question 2 What is the advantage of the third wire of earth connection in domestic appliances?

Question 3 How is the strength of the magnetic field at a point near a wire related to the strength of the electric current flowing in the wire?

Question 4 On what effect of an electric current does an electromagnet work?

Question 5. With the help of a neat-diagram, describe how you can generate induced current in a circuit.
Question 6 Explain terms: (a) overloading and (b) short-circuiting

Question 7 List in tabular form two major differences between electric motor and electric genrator

Question 8 Explain the function of earth wire. Why is it necessary to earth metallic appliances?

Question 9 All household appliances are connected in parallel. List two advantages of this type of arrangement.

10.Explain briefly two different ways to induce current in a coil. State the rule which determines direction of induced current.

Question 11 (a) A stationary charge is placed in a magnetic field. Will it experience force? Give reason and justify your answer.
(b) On what factors does the direction of force experienced by a current carrying conductor when placed in a magnetic field depends?
(c)  Under what conditions is the force experienced by a current carrying conductor placed in a uniform magnetic field is maximum.

Question 12 List four important features of domestic electric circuit. Draw a diagram of common domestic circuit showing live, neutral and earth wires.

Identify the poles of a magnet in the figure.

What is the direction of magnetic field lines outside a bar magnet ?  (CBSE 2010, 2011)

Question 3.
What does crowding of magnetic field lines indicate ? (CBSE 2010, 2011)
                                             Or
What does the degree of closeness of magnetic field lines near the poles signify ? (CBSE 2012)


Question 4.
At what place of the magnet are the magnetic field lines denser ? [CBSE (

Question 5.
What is meant by magnetic field ? [CBSE (Delhi) 2007, 2009, 2014]

Question 6.
How is the direction of magnetic field at a point determined ? [CBSE (Delhi) 2007]


What is SI unit of magnetic field ?

What is the direction of magnetic field lines inside a bar magnet ?

Question 9.
Define a magnetic field line ? (CBSE (All India) 2006, 2010, 2015)
                                        Or
What are magnetic field lines ? (CBSE 2011, 2013)

Give two uses of a magnetic compass. (CBSE 2013)


Question 11.
How is the strength of the magnetic field around a wire related to the strength of the electric current flowing in the wire ? (CBSE 2004)

Question 12.
How can it be shown that magnetic field exists around a wire through which direct current is passing ?
[C.B.S.E; (Delhi) 2004]

Question 13.
What is the nature of magnetic field lines around a current carrying wire ?


Question 14.
State the rule used to determine the direction of magnetic field produced around a straight conductor carrying current. [CBSE (Delhi) 2009; CBSE (All India) 2009, 2011, 2012, 2015]

State the rule to determine the direction of a force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular. (CBSE 2013, 2014, 2015)

compass needle shows deflection when brought near a current carrying conductor. Why ? (CBSE 2015)

Question 17.
Draw a sketch of the pattern of field lines due to a current flowing through a straight conductor.
[CBSE (Delhi) 2009, 2011]

Draw the magnetic field lines through and around a single loop of wire carrying electric current.

Draw the pattern of magnetic field lines of the field produced by a current carrying circular loop.

What is a solenoid ? (CBSE (Delhi) 2009, 2010, 2011, 2012, 2013, 2015)

Question 21.
Write one application of magnetic field of current caWhat does the direction of thumb indicate in the right hand thumb rule ?
Answer:
Direction of the flow of current.

Question 24.
How is an electromagnet made ?


Question 22.
Draw the pattern of field lines of magnetic field through and around a current carrying soleniod.
(CBSE (Delhi) 2009, 2011

Write an expression for the force acting on a conductor of length l carrying current (I) and placed perpendicular to the magnetic field (B).

carbon compounds worksheets for practice 10th

1.An organic compound A on reduction gives compound B molecular formula  C2H6 which when reacted with chlorine gives compound C .
A.identify a,b,c
B.write 2 reactions involved  

2)A.Name the functional groups organic compounds that can be hydrogenated .
B.with the help of reactions explainpricess of hydrogenation
C.mention the conditions needed
D.name one change in physical property with the formation of produ t
E.name any one natural sour e of organic compounds that can be hydrogenated

3.).An organic compound A with molecular formula C2H60 on oxidation I'm presence of oxidising agents gives compound B
A.identify a and b
B write reaction
C.what do you mean by oxidign agents
D.give 2 examples of oxidising agents
E.identify c2H60 and write its next 2 homologues 


4.A test tube contains brown liquid in it .the colour of liquid remains unchanged when methane is passed into it ,but changes when ethene is passed
A.identify brown liquid
B.why is did not change with metha ne and changed with ethene
C.justify with reaction
D.what type of reactions are this
E.how many moles of hydrogen is needed to break 2 double bonds

5.the formula of Ester is C3H7COOC2H5.
A.write the formula of acid and alcohol from which it's obtained
B.justify with reaction
C what is the reagent used here
D .what type of reactions are this
E.NaMe the Ester given C5H11COOC6H13

6).3 mL of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess.
(A) How is 5% solution of KMnO4 prepared?
(B) State the role of alkaline potassium permanganate in this reaction. What happens on adding it in excess?
(C) Write chemical equation of this reaction.
D.what is other oxidising agent we can use here
E.why this reaction is called oxidation reactions

7).A carbon compound ‘P’ on heating with excess cone. H2SO4 forms another carbon compound ‘Q’ which on addition of hydrogen in the presence of nickel catalyst forms a saturated carbon compound ‘R’ One molecule of ‘R’ on combustion forms two molecules of carbon dioxide and three molecules of water.
A)Identify P, Q and R  2 marks
B) write chemical equations for the reactions involved.  3 marks

8).carboxylic acid (molecular formula, C2H4O2) reacts with an alcohol in the presence of an acid catalyst to form a compound ‘X’. The alcohol on oxidation with alkaline KMnO4 followed by acidification gives the same carboxylic acid C2H4O2.
A) Write the name and structure of
(i) carboxylic acid,  1 mark
(ii) alcohol and.       1 mark
(iii) the compound ‘X’  1 mark
Iv) Write all reactions involved  2 marks

9).dropping a small piece of sodium in a test tube containing carbon compound ‘X’ with molecular formula C2H6O, a brisk effervescence is observed and a gas ‘Y’ is produced. On bringing a burning splinter at the mouth of the test tube the gas evolved burns with a pop sound.
A) Identify ‘X’ and ‘Y’. 2marks
B)Also write the chemical equation for the reaction. 1 mark
C) Write the name and structure of the product formed, when you heat ‘X’ with excess cone, sulphuric acid. 

10).Write the name and molecular formula of an organic compound having its name suffixed with ‘ol’ and having two carbon atoms in its molecule.
2marks
Write balanced chemical equation to indicate what happens when this compound is heated with excess cone. H2SO4 and the name of main product formed.2 matks
Also state the role of cone. H2SO4 in the reaction. 1 matks

11).An organic compound ‘X’ on heating with cone. H2SO4 forms a compound ‘Y’ which on addition of one molecule of hydrogen in the presence of nickel forms a compound ‘Z’. One molecule of compound ‘Z’ on combustion forms two molecules of CO2 and three molecules of H2O.
Identify giving reasons the compounds ‘X’, ‘Y’ and ‘Z’.3marks
Write the chemical equations for all the chemical reactions involved. 2marks

12).Give a chemical test to distinguish between saturated and unsaturated hydrocarbon. 1marks
(b) Name the products formed when ethane bums in air. 1marks
Write the balanced chemical equation for the reaction showing the types of energies liberated.
(c) Why is reaction between methane and chlorine in the presence of sunlight considered a substitution reaction? 1mark
D)Justify with reaction 1mark

linear inequations worksheets

Work sheet 1 basics

herons formula worksheets

Herons formula worksheets 

Worksheet1

Worksheet 2

Ratios and perimeters sums

Worksheet 3 

Herons formula when quadrilaterals are given

Worksheet 4 

Herons formulas sums 

When quadrilateral and triangles are given

Worksheet 5 

Miscleeneos and HOTS I'm Herons formula sums