Science and Technology I · Textbook solutions
Effects of Electric Current
Every solved example, exercise, and miscellaneous question, in the order the textbook teaches them. Plus every board question asked from this chapter. · 24 questions
Exercise
24 q
- Tell the odd one out. Give proper explanation.Ex Q1(a)Fuse wire, bad conductor, rubber gloves, generator.
- Ex Q1(b)Voltmeter, Ammeter, galvanometer, thermometer.
- Ex Q1(c)Loud speaker, microphone, electric motor, magnet.
- Explain the construction and working of the following. Draw a neat diagram and label it.Ex Q2(a)Electric motor
- Ex Q2(b)Electric Generator(AC)
- Ex Q3Electromagnetic induction means-
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- Ex Q4Explain the difference : AC generator and DC generator.
- Ex Q5Which device is used to produce electricity? Describe with a neat diagram.
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- Ex Q6How does the short circuit form? What is its effect?
- Give Scientific reasons.Ex Q7(a)Tungsten metal is used to make a solenoid type coil in an electric bulb.
- Ex Q7(b)In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster etc. an alloy such as Nichrome is used, not pure metals.
- Ex Q7(c)For electric power transmission, copper or aluminium wire is used.
- Ex Q7(d)In practice the unit kWh is used for the measurement of electrical energy, rather than joule.
- Ex Q8Which of the statement given below correctly describes the magnetic field near a long, straight current carrying conductor?
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- Ex Q9What is a solenoid? Compare the magnetic field produced by a solenoid with the magnetic field of a bar magnet. Draw neat figures and name various components.
- Name the following diagrams and explain the concept behind them.Ex Q10(a)(a)
- Ex Q10(b)(b)
- Identify the figures and explain their use.Ex Q11(a)(a)
- Ex Q11(b)(b)
- Ex Q11(c)(c)
- Solve the following example.Ex Q12(a)Heat energy is being produced in a resistance in a circuit at the rate of 100 W. The current of 3 A is flowing in the circuit. What must be the value of the resistance?
- Ex Q12(b)Two tungsten bulbs of wattage 100 W and 60 W power work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor?
- Ex Q12(c)Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?
- Ex Q12(d)An electric iron of 1100 W is operated for 2 hrs daily. What will be the electrical consumption expenses for that in the month of April? (The electric company charges Rs 5 per unit of energy).
What the board has asked from this chapter
Questions per paper · 12 papers · 2016 to 2026
2016: 7 questions per paper. 2018: 3 questions per paper. 2019: 3 questions per paper. 2020: 4 questions per paper. 2022: 7 questions per paper. 2023: 3 questions per paper. 2024: 2.5 questions per paper. 2025: 3 questions per paper. 2026: 3.5 questions per paper
June 2026
4 q
- Q1(A)(iv)भारतात प्रत्यावर्ती विद्युतधारेची (AC) वारंवारता ____ आहे.In India the frequency of alternating current (AC) is ______.
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Electric Motor and Generator - Q1(B)(i)वेगळा घटक ओळखा : व्होल्टमीटर, ॲमीटर, गॅल्व्हॅनोमीटर, तापमापी.Find odd one out: Voltmeter, Ammeter, Galvanometer, Thermometer.Magnetic Effect of Electric Current
- Q2(B)(iv)नियम लिहा. (अ) उजव्या हाताच्या अंगठ्याचा नियम (ब) फ्लेमिंगच्या डाव्या हाताचा नियम.State the laws: (a) Right hand thumb rule. (b) Fleming's left hand rule.Magnetic Effect of Electric Current
- Q3(ii)विजेचा एक टंगस्टन दिवा घरी परिपथात बसविलेला आहे. घरगुती विद्युतपुरवठा इतक्या विद्युत–विभवांतरावर चालतो. चालू केल्यावर जर इतकी विद्युतधारा दिव्यातून वाहात असेल, तर : (अ) दिवा किती विद्युतशक्तीचा असला पाहिजे ? (ब) हा दिवा 10 तास चालू ठेवला तर किती युनिट वीज खर्च होईल ?An electric tungsten bulb is connected into a home circuit. The home electric supply runs at V potential difference. When switch on, a current of A flows through the bulb: (a) What must be power (wattage) of the bulb? (b) If it is kept on for hours, how many units of electricity will be consumed?Domestic Electric Circuits and Safety
March 2026
3 q
- Q1(A)(iii)एका तारेचा रोध आहे. त्या तारेतून 1 A विद्युतधारा 10 सेकंद प्रवाहीत केल्यास निर्माण झालेली उष्णता ____ असेल.The resistance of the wire is . If it is carrying a current of for seconds, the heat produced will be ______.
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Heating Effect of Electric Current - Q2(B)(iv)विजेचा एक टंगस्टन दिवा घरी परिपथात बसविला आहे. घरगुती विद्युतपुरवठा 220 V इतक्या विद्युतविभवांतरावर चालतो. चालू केल्यावर जर 0.45 A इतकी विद्युतधारा दिव्यातून वाहात असेल तर दिवा किती W विद्युतशक्तीचा असला पाहिजे ? हा दिवा 10 तास चालू ठेवला तर किती युनिट वीज खर्च होईल ?An electric tungsten bulb is connected into a home circuit. The home electric supply runs at volt potential difference. When switched on, a current of flows through the bulb. What must be the power (wattage) of the bulb? If it is kept 'on' for hours, how many units of electricity will be consumed?Domestic Electric Circuits and Safety
- Q3(iv)विद्युतचलित्राची सुबक नामनिर्देशित आकृती काढून तत्त्व लिहा.Draw a neat labelled diagram of electric motor and write its principle.Electric Motor and Generator
July 2025
3 q
- Q1(A)(iii)____ हे उपकरण विद्युतधारा निर्माण करण्यासाठी वापरतात.____ device is used to produce electricity.
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Electric Motor and Generator - Q1(B)(i)वेगळा घटक ओळखा : वितळतार, विसंवाहक पदार्थ, रबरी मोजे, जनित्रFind the odd one out: Fuse wire, bad conductor, rubber gloves, generator.Domestic Electric Circuits and Safety
- Q3(iv)दिलेल्या आकृत्या अ, ब, क ओळखा व त्यांचे उपयोग लिहा :Identify figure and write one use of it: (a), (b), (c)Domestic Electric Circuits and Safety
March 2025
3 q
- Q1(A)(iii)विजेच्या बल्बमध्ये कुंतल बनविण्यासाठी ____ धातूचा उपयोग करतात.____ is used to make a solenoid type coil in an electric bulb.
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Heating Effect of Electric Current - Q1(B)(ii)वेगळा घटक ओळखा : ध्वनिवर्धक, सूक्ष्मश्रवणी, विद्युतचलित्र, चुंबकFind the odd one out: Loudspeaker, microphone, electric motor, magnet.Magnetic Effect of Electric Current
- Q3(iv)आकृत्यांना नावे देऊन संकल्पना स्पष्ट करा :Name the following diagrams and explain the concept behind them:Electric Motor and Generator
July 2024
3 q
- Q1(A)(iii)विद्युतशक्तीचे एकक ____ हे आहे.The unit of electric power is ______.
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Heating Effect of Electric Current - Q1(B)(v)विद्युतधारेच्या चुंबकीय परिणामावर आधारित कोणत्याही दोन उपकरणांची नावे लिहा.Name two appliances which work on the principle of magnetic effect of electric current.Magnetic Effect of Electric Current
- Q4(i)खालील आकृतीचे निरीक्षण करून विचारलेल्या प्रश्नांची उत्तरे लिहा : (अ) वरील आकृती कोणते उपकरण दर्शविते ? (ब) या उपकरणाचे कार्य कोणत्या तत्त्वावर चालते ? (क) या उपकरणाचे कार्य स्पष्ट करा. (ड) वरील उपकरणाचा उपयोग लिहा.Observe the following diagram and answer the questions given below: (a) Identify the above diagram. (b) Write the principle on which the above appliance works. (c) Write the working of the above appliance. (d) Write the use of the above appliance.Electric Motor and Generator
March 2024
2 q
- Q2(B)(ii)दिलेली आकृती ओळखून तिचा उपयोग लिहा :Identify the figure and explain its use.Electric Motor and Generator
- Q3(viii)नालकुंतल म्हणजे काय ? त्याची योग्य आकृती काढून विविध भागांना नावे द्या.What is a solenoid? Draw a neat diagram and name its various components.Magnetic Effect of Electric Current
March 2023
3 q
- Q1(A)(i)The device used for producing current is called ______.
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Electric Motor and Generator - Q1(B)(i)Find the odd man out: Loudspeaker, Microphone, Electric motor, Magnet.Magnetic Effect of Electric Current
- Q3(vii)Identify figures A, B and C and give their uses.Domestic Electric Circuits and Safety
March 2022
7 q
- Q1(A)(i)Gold plated ornaments is the example of ________.
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Electroplating - Q1(B)(iv)State True or False: An electric motor converts mechanical energy into electrical energy.Electric Motor
- Q2(B)(v)Observe the given figure of Fleming's Left Hand Rule (the thumb shows 'Force of the conductor') and write the labels of 'A' and 'B'.Fleming's Left Hand Rule
- Observe the following diagram (a rectangular current-carrying coil ABCD placed between the poles N and S of a magnet, with conducting rings, carbon brushes, axle and a battery) and answer the questions given below:Q4(i)(a)Identify the above diagram.Electric Motor
- Q4(i)(b)Write the principle on which the above appliance works.Electric Motor
- Q4(i)(c)Write the working of the above appliance.Electric Motor
- Q4(i)(d)Write the use of the above appliance.Electric Motor
March 2020
4 q
- Q1(B)(i)Find the odd one out: Voltmeter, Ammeter, Thermometer, Galvanometer.Electrical Measuring Instruments
- Q1(B)(iii)State true or false: The frequency of AC is 50 Hz.Alternating Current
- Q2(B)(ii)Observe the given figure of Fleming's Right Hand Rule (the thumb shows the motion of a conductor) and write the labels of A and B correctly.Fleming's Right Hand Rule
- Q3(iii)Read the given passage and answer: The home electrical connection consists of 'live', 'neutral' and 'earth' wires. The 'live' and the 'neutral' wires have a potential difference of 220 V. The 'earth' is connected to ground. Due to a fault in the equipment, or if the plastic coating on the 'live' and 'neutral' wires gives way and the two wires come in contact, a large current flows producing heat, and any inflammable material around can catch fire. Therefore a fuse wire is used as a precautionary measure. a. Name the two wires having a potential difference of 220 V. b. What is a short circuit? c. Write the function of a fuse.Domestic Electric Circuit and Fuse
March 2019
3 q
- Q1(B)(2)Observe the given diagram (set-up A: resistors and connected in series across a 5 V cell; set-up B: resistors and connected in parallel), which shows the magnetic lines of force produced, and choose the correct alternative:
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Magnetic Effect of Electric Current - Q2(1)Two tungsten bulbs of power 50 W and 60 W work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor?Domestic Electric Circuits and Safety
- Q2(2)Give scientific reason: In electric equipment producing heat, e.g. iron, electric heater, boiler, toaster etc., an alloy such as Nichrome is used, not pure metals.Heating Effect of Electric Current
March 2018
3 q
- Q1(A)(b)(ii)State whether the following statement is true or false: Magnetic lines of force always cross each other.Magnetic Effect of Electric Current
- Q2(2)State the right hand thumb rule.Magnetic Effect of Electric Current
- Q4(A)Explain the construction and working of an electric motor.Electric Motor and Generator
March 2016
7 q
- Find the odd one out:Q1(A)(2)(i)Voltmeter, ammeter, galvanometer, thermometer.Electrical Measuring Instruments
- Q1(A)(2)(ii)Loudspeaker, bar magnet, electric motor, microphone.Electric Motor and Generator
- Q1(B)(3)In series combination which remains constant?
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Series and Parallel Combination of Resistors - Define the following:Q2(1)(i)Define: 1 volt PD (potential difference).Potential Difference
- Q2(1)(ii)Define: Electric power.Electric Power
- Q4(1)Find the expression for the resistors connected in series and write the two characteristics of it. (Draw figure.)Series and Parallel Combination of Resistors
- Q4(2)Explain 'Electric motor' with the help of the following points: (i) Draw figure (ii) Principle of Electric motor (iii) Name any four appliances where electric motor is used.Electric Motor and Generator
The 10 board questions to practise first
The questions the board asked again come first, most asked first. Each one says how often and when.
Question 1
Asked 3 times: Mar 2016, Mar 2020, Jun 2026
Q1(B)(i)वेगळा घटक ओळखा : व्होल्टमीटर, ॲमीटर, गॅल्व्हॅनोमीटर, तापमापी.Find odd one out: Voltmeter, Ammeter, Galvanometer, Thermometer.Question 2
Asked 3 times: Mar 2016*, Mar 2023, Mar 2025 (* = numbers or wording changed that year)
Q1(B)(ii)वेगळा घटक ओळखा : ध्वनिवर्धक, सूक्ष्मश्रवणी, विद्युतचलित्र, चुंबकFind the odd one out: Loudspeaker, microphone, electric motor, magnet.Question 3
Asked 2 times: Mar 2026, Jun 2026
Q3(ii)विजेचा एक टंगस्टन दिवा घरी परिपथात बसविलेला आहे. घरगुती विद्युतपुरवठा इतक्या विद्युत–विभवांतरावर चालतो. चालू केल्यावर जर इतकी विद्युतधारा दिव्यातून वाहात असेल, तर : (अ) दिवा किती विद्युतशक्तीचा असला पाहिजे ? (ब) हा दिवा 10 तास चालू ठेवला तर किती युनिट वीज खर्च होईल ?An electric tungsten bulb is connected into a home circuit. The home electric supply runs at V potential difference. When switch on, a current of A flows through the bulb: (a) What must be power (wattage) of the bulb? (b) If it is kept on for hours, how many units of electricity will be consumed?Question 4
Asked 2 times: Mar 2020, Jun 2026* (* = numbers or wording changed that year)
Q1(A)(iv)भारतात प्रत्यावर्ती विद्युतधारेची (AC) वारंवारता ____ आहे.In India the frequency of alternating current (AC) is ______.Tap an option to check your answer.
Question 5
Asked 2 times: Mar 2018, Jun 2026* (* = numbers or wording changed that year)
Q2(B)(iv)नियम लिहा. (अ) उजव्या हाताच्या अंगठ्याचा नियम (ब) फ्लेमिंगच्या डाव्या हाताचा नियम.State the laws: (a) Right hand thumb rule. (b) Fleming's left hand rule.Question 6
Asked 2 times: Mar 2016, Mar 2026* (* = numbers or wording changed that year)
Q3(iv)विद्युतचलित्राची सुबक नामनिर्देशित आकृती काढून तत्त्व लिहा.Draw a neat labelled diagram of electric motor and write its principle.Question 7
Asked 2 times: Mar 2023, Jul 2025
Q1(A)(iii)____ हे उपकरण विद्युतधारा निर्माण करण्यासाठी वापरतात.____ device is used to produce electricity.Tap an option to check your answer.
Question 8
This type asked 4 times: Mar 2019, Jul 2024, Mar 2025, Mar 2026. This one: Mar 2026
Q1(A)(iii)एका तारेचा रोध आहे. त्या तारेतून 1 A विद्युतधारा 10 सेकंद प्रवाहीत केल्यास निर्माण झालेली उष्णता ____ असेल.The resistance of the wire is . If it is carrying a current of for seconds, the heat produced will be ______.Tap an option to check your answer.
Question 9
This type asked 4 times: Mar 2019, Mar 2020, Jul 2025, Mar 2026. This one: Jul 2025
Q1(B)(i)वेगळा घटक ओळखा : वितळतार, विसंवाहक पदार्थ, रबरी मोजे, जनित्रFind the odd one out: Fuse wire, bad conductor, rubber gloves, generator.Question 10
This type asked 4 times: Mar 2023, Mar 2024, Mar 2025, Jul 2025. This one: Jul 2025
Q3(iv)दिलेल्या आकृत्या अ, ब, क ओळखा व त्यांचे उपयोग लिहा :Identify figure and write one use of it: (a), (b), (c)