CBSE Class 10 Science Electricity Worksheet

Read and download free pdf of CBSE Class 10 Science Electricity Worksheet. Students and teachers of Class 10 Science can get free printable Worksheets for Class 10 Science Chapter 12 Electricity in PDF format prepared as per the latest syllabus and examination pattern in your schools. Class 10 students should practice questions and answers given here for Science in Class 10 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 10 Science Worksheets prepared by teachers as per the latest Science books and syllabus issued this academic year and solve important problems with solutions on daily basis to get more score in school exams and tests

Worksheet for Class 10 Science Chapter 12 Electricity

Class 10 Science students should refer to the following printable worksheet in Pdf for Chapter 12 Electricity in Class 10. This test paper with questions and answers for Class 10 will be very useful for exams and help you to score good marks

Class 10 Science Worksheet for Chapter 12 Electricity

Question. A letter A is constructed of a uniform wire of resistance 1 ohm per cm. The sides of the letter are 20 cm and the cross piece in the middle is 10 cm long. The resistance between the ends of the legs will be
(a) 32.4 ohm
(b) 28.7 ohm
(c) 26.7 ohm
(d) 24.7 ohm
Answer : C

Question. Three resistances of 2, 3 and 5 W are connected in parallel to a 10 V battery of negligible internal resistance. The potential difference across the 3 W resistance will be
(a) 2 V
(b) 3 V
(c) 5 V
(d) 10 V
Answer : D

Question. You are given n identical wires, each of resistance R. When these are connected in parallel, the equivalent resistance is X. When these will be connected in series, then the equivalent resistance will be
(a) X/n2
(b) n2X
(c) X/n
(d) nX
Answer : B

Question. 20 coulomb charge is flowing in 0.5 second from a point in an electric circuit then value of electric current in amperes will be
(a) 10
(b) 40
(c) 0.005
(d) 0.05
Answer : B

Question. A cylindrical rod is reformed to twice its length with no change in its volume. If the resistance of the rod was R, the new resistance will be
(a) R
(b) 2R
(c) 4R
(d) 8R
Answer : C

Question. A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination isRl, then the ratio R/Rl is
(a) 1/25
(b) 1/5
(c) 5
(d) 25
Answer : D

Question. 2 ampere current is flowing through a conductor from a 10 volt emf source then resistance of conductor is
(a) 20 W
(b) 5 W
(c) 12 W
(d) 8 W
Answer : B

Question. Three resistors of 4.0 W , 6.0 W and 10.0 W are connected in series. What is their equivalent resistance
(a) 20 W
(b) 7.3 W
(c) 6.0 W
(d) 4.0 W
Answer : C

Question. Two unequal resistances are connected in parallel. Which of the following statement is true
(a) current in same in both
(b) current is larger in higher resistance
(c) voltage-drop is same across both
(d) voltage-drop is lower in lower resistance
Answer : C

Question. A wire of resistance R is cut into ten equal parts which are then joined in parallel. The new resistance is
(a) 0.01 R
(b) 0.1 R
(c) 10 R
(d) 100 R
Answer : A

Question. A 24 V potential difference is applied is applied across a parallel combination of four 6 ohm resistor. The current in each resistor is
(a) 1 A
(b) 4 A
(c) 16 A
(d) 36 A
Answer : B

Question. A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively (Figure).
Which of the following is true?
(a) R1 > R2 = R
(b) R1 > R2 > R3
(c) R> R2 = R1
(d) R2 > R> R1
Answer : C

Question. A current of 4.8 A is flowing in a conductor. The number of electrons passing per second through the conductor will be
(a) 3 x 1020
(b) 76.8 x 1020
(c) 7.68 x 10-19
(d) 3 x 1019
Answer : D

Question. How much work is done in moving a charge of 2 C from a point of 118 V to a point of 128 V?
(a) 20 J
(b) 30 J
(c) 40 J
(d) 10 J
Answer : A

Question. Two bulbs have the following ratings:
1. 40 W, 220 V
2. 20 W, 100 V
The ratio of their resistance is
(a) 1: 2
(b) 2 :1
(c) 1:1
(d) 1: 3
Answer : B

Question. A current of 1 A is drawn by a filament of an electric bulb. Number or electrons passing through a cross section of the filament in 16 seconds would be roughly
(a) 1020
(b) 1016
(c) 1018
(d) 1023
Answer : A

Question. If a wire of resistance R is melted and recast to half of its length, the new resistance of the wire will be
(a) R/4
(b) R/2
(c) R
(d) 2R
Answer : A

Question. A circular conductor is made of a uniform wire of resistance 2x10-3 ohm/metre and the diameter of this circular conductor is 2 metres. Then the resistance measured between the ends of the diameter is (in ohms)
(a) p x 10-3
(b) 2p x 10-3
(c) 4p x 10-3
(d) 4x 10-3
Answer : C

Question. The length of a wire is doubled. By what factor does the resistance change
(a) 4 time as large
(b) twice as large
(c) unchanged
(d) half as large
Answer : D

Question. An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?
(a) 1 A
(b) 2 A
(c) 4 A
(d) 5 A
Answer : D

Question. Which of the following statements is/are incorrect? 
A. A neutron has a positive charge of +1.6 x 10-19C
B. An ammeter is a low resistance device.
C. Resistance of semiconductors decreases with temperature.
D. One ampere is equal to 10-6 uA.
a. A and C
b. A and D
c. A and B
d. A, B and C
 
Answer : B
Explanation: B and C are correct. An ammeter is a low resistance device. A semiconductor material has an electrical conductivity value falling between that of a conductor, such as copper, and an insulator, such as glass. As the temperature increases, their resistance decreases. A and D are incorrect. A neutron is a sub-atomic particle that has no charge. One μA is equal to 10-6 A. An ampere is a bigger unit. Micro-ampere (μA) is a smaller unit.
 
Question. The current flowing through a resistor connected in an electrical circuit and the potential difference developed across its ends are shown in the given diagrams : 
U-4
The value of resistance of the resistor in ohms is
a. 15
b. 25
c. 10
d. 20
 
Answer : A

Question. A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio R/R’ is:
a. 125
b. 15
c. 5
d. 25
Answer : D

Question. Out of the four given circuits for studying the dependence of the current on the potential difference across a resistor, the circuit that has been correctly drawn, is circuit (1)
U-3
a. A
b. C
c. D
d. B
 
Answer : D
Explanation: Ammeter should be connected in series and the voltmeter in parallel along with resistor in parallel with correct polarities. 
 
 

Fill in The Blank

Question. Fuse wire has a ......... melting point and is made of an alloy of ......... and ......... If the current in a circuit rises too high, the fuse wire .........
Answer : Low, lead, tin, melts

Question. In a parallel circuit, each circuit, each circuit element has the same ..........
Answer : Potential difference

Question. The .......... reaction within the cell generates the potential difference between its two terminals that sets the .......... in motion to flow the current through a resistor.
Answer : chemical

Question. ......... is a property that resists the flow of electrons in a conductor.
Answer : Resistance

Question. Power transmission is carried out at high .......... and low ........ .
Answer : Voltage, current

Question. The S.I. unit of electric current is ..........
Answer : Ampere

Question. The S.I. unit of resistance is ..........
Answer : Ohm (W )

Question. Rate at which electric work is done is called .........
Answer : Electric power

Question. The rate of flow of electric charge is called ..........
Answer : Current

Question. Electric energy is produced by the ........ of charges.
Answer : Separation

Question. Potential difference is a .......... quantity.
Answer : Scalar

Question. Two resistances of 2 W each are connected in parallel. The equivalent resistance is .......... .
Answer : 1 W

 

Assertion and Reason

DIRECTION : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
(e) Both Assertion and Reason are false.

Question. Assertion : When the resistances are connected between the same two points, they are said to be connected in parallel.
Reason : In case the resistance is to be decreased, then the individual resistances are connected in parallel.
Answer : B

Question. Assertion : When the length of a wire is doubled, then its resistance also gets doubled.
Reason : The resistance of a wire is directly proportional to its length.
Answer : A

Question. Assertion : A torch bulb give light if operated on AC of same voltage and current as DC.
Reason : Heating effect is common to both AC and DC.
Answer : A

Question. Assertion : In a simple battery circuit the point of lowest potential is positive terminal of the battery.
Reason : The current flows towards the point of the lower potential as it flows in such a circuit from the negative to the positive terminal.
Answer : D

Question. Assertion : 40 W tube light give more light in comparison to 40 w bulb.
Reason : Light produced is same from same power.
Answer : D

Question. Assertion: Tungsten metal is used for making filaments of incandescent lamps.
Reason : The melting point of tungsten is very low.
Answer : C

Question. Assertion : A resistor of resistance R is connected to an ideal battery. If the value of R is decreased, the power dissipated in the circuit will increase.
Reason : The power dissipated in the circuit will increase.
Answer : C

Question. Assertion : Resistance of 50 W bulb is greater than that of 100 W.
Reason : Resistance of bulb is inversely proportional to rated power.
Answer : B

Question. Assertion : A tube light emits white light.
Reason : Emission of light in a tube takes place at a very high temperature
Answer : C

Question. Assertion : Insulators do not allow flow of current through themselves.
Reason : They have no free-charge carriers.
Answer : A

 

Very Short Answers :

Question. What is the direction of electronic current ? 
Answer : Electrons flow from negative to positive i.e. in the direction opposite to that of conventional current. 

Question. What does an electric circuit mean?
Answer :  A continuous and closed path of an electric current is called an electric circuit. An electric circuit consists of electric devices, source of electricity and wires that are connected with the help of a switch.

Question. A wire of resistivity is pulled to double its length. What will be its new resistivity? 
Answer : When a wire of resistivity rho is pulled to double it's length then new resistivity of conducting wire will not change as resistivity depends on the nature of material not on the length of conductor.

Question. The radius of conducting wire is doubled. What will be the ratio of its new specific resistance to the old one?
Answer: 1 : 1, specific resistance does not change as it depends on the nature of material only.

Question. How are bulbs connected in a fairy light circuit used for decoration of buildings in festivals ?
Answer: Series combination.

Question. What will happen to the resistivity of a wire of length L if it is cut into three parts?
Answer: Resistivity of the wire will not change even when the wire is cut into three parts as resistivity is a characteristic of the material of the conductor and does not depend on the physical dimensions of the conductor.

Question. What is the mistake in the circuit given below ? 
CBSE Class 10 Science Electricity Worksheet

Answer: The terminals of ammeter are wrongly connected.

Question. What determines the rate at which energy is delivered by a current?
Answer: Electric power is the rate at which energy is delivered by a current

Question. Name the type of current used in household supply.
Answer: Alternate current

Question. A bulb gets dimmer when an electric iron or geyser is switched on, why?
Answer: It is because electric iron or geyser draws heavy current from the circuit, takes heavy power and therefore bulb becomes dimmer due to decrease in voltage

Question. Write the relationship between heat energy produced in a conductor when potential difference V is applied across its terminals and a current, I flows through it for the time ‘t’.
Answer: H = VIt

Question. Why heat is produced when current is passed through a conductor?
Answer: The electrons collide with each other while moving and loses some kinetic energy which is converted into heat energy.

Question. Why are heating elements made of alloys rather than metals?
                                                  OR
Why are alloys commonly used in electrical heating devices like toasters and electric iron? Give reason.
Answer:  Alloys have high resistivity/high melting point/alloys do not oxidise (or burn readily at high temperatures).

 

Question. Identify the X, Y and Z in the circuit given below : 
CBSE Class 10 Science Electricity Worksheet

Answer: X = Ammeter, Y = Rheostat, Z = Voltmeter.

Question. If two resistors in series have ‘p’ number of common points. What will be the value of ‘p’?
Answer: One.

Question.The resistance of a wire of length 150 cm and of uniform area of cross-section 0.015 cm2, is found to be 3.0 W. Calculate the specific resistance of the wire.
Answer: Here, l = 150 cm; A = 0.015 cm2; R = 3.0 W.
Specific resistance, r = RA/1
= 3.0 X 0.015/150
= 0·0003 W cm.

Question. Define resistance of a conductor.
Answer: The obstruction offered to the flow of current by a conductor is called its resistance.

Question. State Ohm’s law.
Answer: According to Ohm’s law, the current flowing in a conductor is directly proportional to the potential difference applied across its ends, provided the temperature and other physical conditions of the conductor remain constant.

Question. Define resistivity.
Answer: The resistivity of a substance is numerically equal to the resistance of a rod of that substance which is 1 metre long and 1 square metre in cross-section.

Question. Define the unit of current.
Answer :  The unit of electric current is ampere (A). 1 A is defined as the flow of 1 C of charge through a wire in 1 s. 

Question. Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?
Answer : The current will flow more easily through thick wire. It is because the resistance of a conductor is inversely proportional to its area of cross - section. If thicker the wire, less is resistance and hence more easily the current flows.

Question. Name a device that helps to maintain a potential difference across a conductor.
Answer :  Any source of electricity like battery, cell, power supply, etc. helps to maintain a potential difference across a conductor.

Question. What is meant by saying that the potential difference between two points is 1 V?
Answer : If 1 J of work is required to move a charge of amount 1 C from one point to another, then it is said that the potential difference between the two points is 1 V.

Question.  Mention the conditions under which current can flow in a conductor?
Answer : a) Circuit is closed b) There is a potential difference along the conductor.

Question.  How will be the resistance of a conductor change if its area is doubled?
Answer :
Resistance will become half as R is inversely proportional to area.

Question.  When do we say that potential difference between two points in a circuit is 1 volt?
Answer : When 1 joule of work is done to move a charge of 1 coulomb from one point to the other 

Question.  What is the resistance of an ideal voltmeter?
Answer :
Infinite

Question.  What is the amount of charge when a current of 4A flows in a circuit for 10 minutes?
Answer :
Q = I x t = 4x 10x 60 = 2400C

 

Short Answers :

Question.  A potential difference of 220 V is applied across a resistance of 440 in an electric ion. 
i. Find the current.
ii. Heat energy produced is 30s.
Answer :
U-7
 
Question. What is the resultant resistance when number of resistors are connected in parallel? 
Answer :  A circuit in which two or more resistors are connected across common points so as to provide separate paths is called parallel circuit.
In this case, the same potential difference will be maintained between the two ends of every resistor and the current will divide itself in various branches.
U-8
Let the resistors R1, R2 and R3 be joined in parallel to the points A and B. Let the current I reaching A divide itself into three parts I1, I2 and I3 along R1, R2 and Rrespectively. Let V be the potential difference between the points A and B. The current flowing in the individual resistors are then given by :

Question. V-I graph for two wires A and B are shown in the figure. If both wires are of same length and same thickness, which of the two is made of a material of high resistivity? Give justification for your answer.

Electricity_17

Answer :  Greater than slope of V-I graph, greater will be the resistance of given metallic wire. In the given graph, wire A has greater slope then B. Hence, wire A has greater resistance. For the wires of same length and same thickness, resistance depends on the nature of material of the wire, i.e.

Electricity_18

Question. A wire of resistance 20 Ω is bent to form a closed square. What is the resistance across a diagonal of the square?
Answer :  


Electricity_19

 

Question. Calculate the number of electrons constituting one coulomb of charge.
Answer :  One electron possesses a charge of 1.6 ×10-19C, i.e., 1.6 ×10-19C of charge is contained in 1 electron.
∴ 1 C of charge is contained in 1/1.6 x 10-19 = 6.25 x 1018 = 6 x 1018
Therefore, 6 x 1018 electrons constitute one coulomb of charge. 

Question.  Explain the role of fuse wire connected in series with any electrical appliance in an electric circuit.
Why should a fuse with a defined rating for an electric circuit not be replaced by the one with a larger rating?
Answer : Fuse wire is a safety device connected in series with the live wire of the circuit, since it has high  resistivity and low melting point. It melts when a sudden urge of large current passes through it and disconnects the entire circuit from the electrical supply. But in case if we use a larger rating fuse wire instead of a defined rating fuse wire then it will not protect the circuit as high current will easily pass through it and it will not melt.

Question.  Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
Answer : Energy consumed by 250 W TV in 1 h = 250 × 1 = 250 W h
Energy consumed by 1200 W toaster in 10 minutes = 1200 x 10/60 = 200 W h
Here total energy consumed by the TV is more than toaster

Question.  Why does the cord of an electric heater not glow while the heating element does? 
Answer : The cord of the electric heater is made up of copper or aluminium which has lower resistance and higher conductance, therefore very less heat energy is produced.
Heating element is made up of alloys which have high resistance and lot of heat is produced, and only a little amount of electric energy makes it to glow

 

Long Answers :

Question.  What is Ohm's law? How can it be verified? 
Answer :  Ohm's law states that the current passing through a conductor is directly proportional to the potential difference across its ends provided the temperature and other physical conditions remains unchanged.
or I μ V or V μ I or V = RI
where R is a constant called resistance. Resistance is the property of a body to oppose the flow of current. R the resistance depends upon the nature of the conductor, its temperature and its dimensions (length, area)
R = V/I or I = V/Ri.e. I α V and I α I/R
U-5
 Experimental Verification of Ohm's Law: To verify Ohm's law, take a resistor R, connect voltmeter across it. Connect an ammeter, battery, key and rheostat to it as shown in Fig. Put in the key K. Read the value of potential difference across resistor R with the help of voltmeter and the current flowing through resistor with the help of ammeter. Note the readings. Vary the current in the circuit by sliding rheostat and go on noting reading in voltmeter and ammeter. Plot a graph between V and I on graph paper. It will come out to be straight line as shown in fig.
U-6
 

Question. A. Two identical wires one of nichrome and other of copper are connected in series and a current (I) is passed through them. State the change observed in the temperatures of the two wires. Justify your answer. State the law which explains the above observation.
B. An electric bulb is rated at 60 W, 240 V. Calculate its resistance. If the voltage drops to 192 V, calculate the power consumed and the current drawn by the bulb. (Assume that the resistance of the bulb remains unchanged.)
Answer :  A. The resistivity of nichrome is more than that of copper so its resistance is also high. Therefore, large amount of heat is produced in the nichrome wire for the same current as compared to that of copper wire. Accordingly, more change in temperature is observed in the nichrome wire. This is explained by Joule’s law of heating. Joule’s law of heating: It states that the amount of heat produced in a conductor is

Electricity_20

Question. How much energy is given to each coulomb of charge passing through a 6 V battery?
Answer : The energy given to each coulomb of charge is equal to the amount of work which is done in moving it.
Now we know that,
Potential difference = Work Done/Charge
∴ Work done = Potential difference × charge
Where, Charge = 1 C and Potential difference = 6 V
∴ Work done = 6×1
= 6 Joule. 

Question.  On what factors does the resistance of a conductor depend?
Answer : The resistance of a conductor depends upon the following factors:
→ Length of the conductor
→ Cross-sectional area of the conductor
→ Material of the conductor
→ Temperature of the conductor 

Chapter 16 Sustainable Management of Natural Resources
CBSE Class 10 Science Sustainable Management of Natural Resources Worksheet

CBSE Class 10 Science Chapter 12 Electricity Worksheet

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Chapter 12 Electricity worksheet Science CBSE Class 10

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