Answer:- The spinal cord is made up of nerves.

Question 2 What is the main coordination center of the body?

Answer:- Brain.

Question 3 Which system do the brain and the spinal cord together make up?

Answer: Central nervous system.

Question 4 Who receives information from all parts of the body?

Answer:- Brain and spinal cord.

Question 5 Give examples of optional works.

Answer:- Writing, talking, clapping etc.

Question 6: On what are voluntary actions based?

Answer:- They are based on the decision of what to do next.

Question 7: Who facilitates communication between the central nervous system and other parts of the body?

Answer:- Peripheral nervous system.

Question 8 What is the system made up of cranial nerves and Nehru nerves called?

Answer:- Peripheral nervous system.

Question 9 Who gives us the permission to think and the permission for actions based on thinking?

Answer:- Brain.

Question 10 How many are the main parts of the brain?

Answer :- 3 parts fore brain, middle brain and hind brain.

Question 11: Which part of the brain does the work of thinking?

Answer:- Fore brain.

Question 12: In which brain are there areas to receive sensory impulses from receptors?

Answer: In the forebrain.

Question 13 For what functions are the different parts of the forebrain specialized?

Answer: For hearing, seeing, smelling etc.

Question 14: By whom is the decision taken to transmit feedback and information to the motivational region?

Answer: By the forebrain.

Question 15 In which part of the brain is the area related to hunger?

Answer: In the forebrain.

Question 16: What are involuntary actions?

Answer:- Actions on which our thinking has no control are called involuntary actions.

Question 17: By whom are all involuntary actions controlled?

Answer: Through the medulla located in the hindbrain.

Question 18 Give examples of involuntary actions.

Answer: Blood pressure, salivation, vomiting etc.

Question 19: Walking in a straight line is controlled by what?

Answer: By the cerebellum located in the hindbrain.

Question 20 By whom is cycling controlled?

Answer: By the cerebellum located in the hindbrain.

Question 21 What controls the lifting of a pencil?

Answer: By the cerebellum located in the hindbrain.

Question 22 Who is responsible for the purification of voluntary actions?

Answer: Cerebellum.

Question 23 Which is responsible for the constitution and balance of the body?

Answer: Cerebellum.

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भारत के संविधान में किसी एक भाषा को राष्ट्रीय भाषा का दर्जा नहीं दिया गया है। हिंदी को राजभाषा माना गया है, लेकिन हिंदी सिर्फ़ 40% (लगभग) भारतीयों की मातृभाषा है। इसलिए अन्य भाषाओं के संरक्षण के अनेक उपाय किए गए हैं। संविधान में हिंदी के अलावा अन्य 21 भाषाओं को अनुसूचित भाषा का दर्जा दिया गया है। केंद्र सरकार के किसी पद का उम्मीदवार इनमें से किसी भी भाषा में परीक्षा दे सकता है, बशर्ते उम्मीदवार इसे विकल्प के रूप में चुनें। राज्यों की भी अपनी राजभाषाएँ हैं। राज्यों का अपना अधिकांश काम अपनी राजभाषा में ही होता है।

श्रीलंका के ठीक उलट हमारे देश के नेताओं ने हिंदी के उपयोग को बढ़ावा देने के मामले में बहुत सावधानी भरा व्यवहार किया। संविधान के अनुसार सरकारी कामकाज की भाषा के तौर पर अंग्रेजी का प्रयोग 1965 में बंद हो जाना चाहिए था, लेकिन अनेक गैर-हिंदी भाषी प्रदेशों ने मांग की कि अंग्रेजी का प्रयोग जारी रखा जाए। तमिलनाडु में तो इस मांग ने उग्र रूप भी ले लिया था। केंद्र सरकार ने हिंदी के साथ-साथ अंग्रेजी को राजकीय कामों में प्रयोग की अनुमति देकर इस विवाद को सुलझाया। अनेक लोगों का मानना था कि इस समाधान से अंग्रेजी-भाषी अभिजन को लाभ पहुंचेगा।

राजभाषा के रूप में हिंदी को बढ़ावा देने की भारत सरकार की नीति बनी हुई है, लेकिन बढ़ावा देने का मतलब यह नहीं कि केंद्र सरकार उन राज्यों पर भी हिंदी को थोप सकती है, जहां लोग कोई और भाषा बोलते हैं। भारतीय राजनेताओं ने इस मामले में जो लचीला रुख अपनाया, उसी से हम श्रीलंका जैसी स्थिति में पहुंचने से बच गए।

व्याख्या

भारत एक बहुभाषी देश है। यहां 121 भाषाएं बोली जाती हैं, जिनमें से 22 भाषाएं संविधान में अनुसूचित भाषाओं के रूप में मान्यता प्राप्त हैं। हिंदी भारत की राजभाषा है, लेकिन यह देश की राष्ट्रीय भाषा नहीं है।

भारतीय संविधान ने भाषाओं के संरक्षण के लिए अनेक उपाय किए हैं। इनमें से कुछ प्रमुख उपाय निम्नलिखित हैं:

• संविधान में हिंदी के अलावा अन्य 21 भाषाओं को अनुसूचित भाषाओं का दर्जा दिया गया है।
• केंद्र सरकार के किसी पद का उम्मीदवार इनमें से किसी भी भाषा में परीक्षा दे सकता है।
• राज्यों की भी अपनी राजभाषाएँ हैं।

हिंदी को बढ़ावा देने के लिए भी अनेक उपाय किए गए हैं। इनमें से कुछ प्रमुख उपाय निम्नलिखित हैं:

• हिंदी को केंद्र सरकार के कार्यों में प्रयोग किया जाता है।
• हिंदी को स्कूलों और विश्वविद्यालयों में पढ़ाया जाता है।
• हिंदी में साहित्य, पत्रकारिता और फिल्मों का विकास किया जा रहा है।

श्रीलंका एक बहुभाषी देश है, लेकिन वहां सिंहल भाषा को राष्ट्रीय भाषा का दर्जा दिया गया है। इस कारण वहां तमिल भाषियों और सिंहल भाषियों के बीच संघर्ष होता रहा है। भारत में भी हिंदी को बढ़ावा देने के मामले में इस तरह के संघर्ष की संभावना थी, लेकिन भारतीय राजनेताओं ने इस मामले में एक लचीला रुख अपनाया। उन्होंने हिंदी को बढ़ावा देने के साथ-साथ अन्य भाषाओं के संरक्षण की भी नीति अपनाई। इस कारण भारत में श्रीलंका जैसी स्थिति नहीं बन पाई।

निष्कर्ष

भारत की भाषा नीति एक जटिल मुद्दा है। इस मुद्दे पर विभिन्न दृष्टिकोण हैं। लेकिन भारत के संविधान में भाषाओं के संरक्षण के लिए जो उपाय किए गए हैं, वे संतुलित हैं। इन उपायों से भारत में एक बहुभाषी समाज में शांति और सद्भाव बनाए रखने में मदद मिल रही है।

कक्षा 10 सामाजिक विज्ञान भाषायी राज्य

The post कक्षा 10 सामाजिक विज्ञान भाषा नीति appeared first on .

भाषायी राज्य क्या है?

भाषाई राज्य वह राज्य है जिसकी अधिकांश आबादी एक ही भाषा बोलती है। भाषाई राज्यों का निर्माण करने का उद्देश्य एक ही भाषा बोलने वाले लोगों को एक साथ लाने और उनकी भाषा और संस्कृति को संरक्षित करना है।

भाषाई राज्यों के निर्माण के कारण

भारत में भाषाई राज्यों के निर्माण के कई कारण थे, जिनमें शामिल हैं:

• भाषाई अस्मिता की भावना
• भाषाई विविधता
• राजनीतिक दबाव

भारत में भाषाई अस्मिता की भावना बहुत मजबूत है। लोग अपनी भाषा और संस्कृति के प्रति बहुत संवेदनशील हैं। भाषाई राज्यों के निर्माण से इन लोगों को अपनी भाषा और संस्कृति को संरक्षित करने का अवसर मिला।

भारत में भाषाई विविधता भी बहुत अधिक है। देश में 22 आधिकारिक भाषाएँ हैं और कई अन्य भाषाएँ भी बोली जाती हैं। भाषाई राज्यों के निर्माण से इन विभिन्न भाषाओं को संरक्षित करने में मदद मिली है।

भाषाई राज्यों के निर्माण के लिए राजनीतिक दबाव भी एक महत्वपूर्ण कारक था। कई भाषा समुदायों ने भाषाई राज्यों की मांग उठाई। इन मांगों को अंततः सरकार ने स्वीकार किया और भाषाई राज्यों का निर्माण किया गया।

भाषाई राज्यों का गठन क्यों हुआ?

भाषाई राज्यों का गठन करने के कई कारण थे, जिनमें शामिल हैं:

• भाषाई अस्मिता की भावना को संतुष्ट करने के लिए
• भाषाई विविधता को संरक्षित करने के लिए
• राजनीतिक स्थिरता और एकता को बढ़ावा देने के लिए

भाषाई राज्यों के गठन से भाषाई अस्मिता की भावना को संतुष्ट करने में मदद मिली है। लोगों को अपनी भाषा और संस्कृति को संरक्षित करने का अवसर मिला है।

भाषाई राज्यों के गठन से भाषाई विविधता को भी संरक्षित करने में मदद मिली है। विभिन्न भाषाओं को संरक्षण देने के लिए अलग-अलग राज्यों का निर्माण किया गया है।

भाषाई राज्यों के गठन से राजनीतिक स्थिरता और एकता को भी बढ़ावा मिला है। विभिन्न भाषा समुदायों को एक साथ लाने से देश में एकता बढ़ी है।

भाषाई राज्य निम्नलिखित हैं:

• असम (असमिया)
• बिहार (भोजपुरी, मैथिली, उर्दू, बंगाली)
• गुजरात (गुजराती)
• हरियाणा (हरियाणवी)
• हिमाचल प्रदेश (पंजाबी)
• जम्मू और कश्मीर (कश्मीरी, उर्दू, डोगरी)
• कर्नाटक (कन्नड़)
• केरल (मलयालम)
• महाराष्ट्र (मराठी)
• मणिपुर (मणिपुरी)
• मेघालय (खासी, जयंतिया, गारो)
• मिजोरम (मिजो)
• नागालैंड (नागा)
• ओडिशा (ओडिया)
• पंजाब (पंजाबी)
• राजस्थान (राजस्थानी)
• सिक्किम (लेप्चा, नेपाली)
• तमिलनाडु (तमिल)
• तेलंगाना (तेलुगु)
• त्रिपुरा (त्रिपुरी)
• उत्तर प्रदेश (हिन्दी, उर्दू, अवधी, बघेली, बुंदेली, भोजपुरी, राजस्थानी, खड़ी बोली)
• उत्तराखंड (पंजाबी, गढ़वाली, कुमाऊँनी)
• पश्चिम बंगाल (बंगाली)

The post कक्षा 10 सामाजिक विज्ञान भाषायी राज्य appeared first on .

बेरूत शहर में खलील नाम का एक लहराइल वाला बालक रहता था। उसकी आँखों में सपने झिलमिलाते थे और दिल में देश के लिए जुनून ज्वाला भड़काता था। वह बड़ा होकर राष्ट्रपति बनना चाहता था, लेबनान का मुखिया बनकर अपने देश को नई ऊँचाइयों पर पहुँचाना चाहता था। लेकिन उसके रास्ते में एक बड़ा पहाड़ खड़ा था, जिसका नाम था – धर्म!

खलील के माता-पिता अलग-अलग समुदायों से थे। पिता तो थे रूढ़िवादी ईसाई, लेकिन माँ सच्ची मुसलमान। लेबनान में ऐसे मेल बहुत थे, खूबसूरत परंपराओं का ताना-बाना बुना था। पर इतिहास के गलत मोड़ पर धर्म एक खूंखार तलवार बन गया था, जिसने भाई-भाई को लड़ा दिया था। एक खौफनाक गृहयुद्ध ने पूरे मुल्क को झकझोर दिया था, जिसकी भयावह यादें खलील के चाचा की शहादत में अब भी जिंदा थीं।

गृहयुद्ध के बाद शांति लौटी, लेकिन उसके साथ लेबनान के नेताओं ने एक अनोखी व्यवस्था बनाई। सत्ता का तराजू धर्म के हिसाब से तौला जाने लगा। कैथोलिक ईसाई ही राष्ट्रपति बन सकता था, प्रधानमंत्री का तख्त मुसलमानों के लिए था। ये सब धर्मों के बीच शांति का एक नाजुक समझौता था, जिसकी कीमत खलील को हर रोज चुकाना पड़ता था।

वह सोचता था, “मैं तो आखिर हूँ क्या? ईसाई भी नहीं, मुसलमान भी नहीं! मेरा सपना तो सिर्फ लेबनान की भलाई का है, धर्म के बंधनों में क्यों उलझूँ?” पर सत्ता का दरवाजा उसके लिए हमेशा बंद ही रहता था।

एक दिन, जब खलील अपनी उलझन के जंगल में खोया हुआ था, उसे अपने दादा की बातें याद आईं। दादा कहता था, “पहाड़ को तोड़ पाना मुश्किल है, लेकिन रास्ता बदलकर चढ़ाई की जा सकती है।” खलील की आँखों में उम्मीद की चिंगारी लौटी। “शायद धर्मों की दीवारें तोड़ना मुश्किल है, लेकिन मैं तो ऐसा राज बनाऊंगा जहाँ हर किसी को उसकी योग्यता का हक मिले, जहाँ धर्म न बोलें, बल्कि सिर्फ इंसानियत गूंजे!”

यह सोचकर खलील ने अपनी मुहिम शुरू की। उसने साथियों को जोड़ा, लोगों को समझाया कि लेबनान को धर्म के बंधनों से मुक्त होना चाहिए। उसने बताया कि असली ताकत तो योग्यता और ईमानदारी में होती है, न कि मंदिर-मस्जिद में।

धीरे-धीरे, खलील की आवाज दूर-दूर तक पहुँचने लगी। हर गली में, हर चौक पर उसकी बात सुनी जाने लगी। लोगों को एहसास हुआ कि खलील की सोच में सच्चाई है, एक नए लेबनान की आशा है।

लेकिन सब रास्ते इतने आसान नहीं होते। पुराने तौर-तरीकों के हिमायती बौखला गए। खलील को खतरे, दबाव, डरावे का सामना करना पड़ा, लेकिन वह डगमगाया नहीं। वह जानता था कि जब हवा का रुख बदलने वाला होता है, तो हर पेड़ हिलता है।

आखिर में, लेबनान के लोगों ने चुनाव किया। उन्होंने धर्म के पंजे से सत्ता को मुक्त करने का फैसला किया। एक नए जहान की खुशबू हवा में घुलने लगी, जहाँ खलील के जैसे हज़ारों सपनों को उड़ान मिली।

यह कहानी अधूरी है, सवाल अनसुलझा है। क्या लेबनान धर्म के बंधनों को तोड़ पाएगा? क्या खलील का सपना Wirklichkeit बनेगा

The post कक्षा 10 सामाजिक विज्ञान सत्ता की साझेदारी MCQ appeared first on .

Electric Current and Electric Circut

Question :What is electricity?

Answer: The flow of electrons is called electricity.

Question : What is the electric circuit?

Answer: A continuous and closed path of an electric current is called an electric circuit.

Question :Electric current represent what 

1. Charge per unit 
2. Charge per unit time 
3. Charge per unit volume 
4. Charge per unit area 

Question : What is electric current? 

Answer :It is the rate of flow of electric charges in a given time in a cross section.

Questions :Which type of wire is used to constitute the flow of electrons? 

Answer :Metallic wire 

Question: State some difference between electric current and electric circuit? 

Answer : Electric circuit – A continuous and closed path of an electric current is called an electric circuit. 

Electric current –  it is the rate of flow of electric charges in a given time.

Question: What happens if the circuit is broken?

Answer: if the circuit is broken the current stops flowing in it.

Question: How do we Express electric current ?

Answer: Electric current is expressed by the amount of charge flowing through a particular area in unit time, in other word it is the rate of flow of electric charges.

Question: What is the SI unit of electric charge?

Answer Coulomb (C).

Question 1 coulomb is equivalent to ?

Answer  6 x 10¹⁸ electrons.

Question: How much charge is contained in one electron?

Answer 1.6 x 10^-19 c

Question: Which unit is used to express the electric current?

Answer: Ampere (A)

Question: Small quantity of current are expressed by what?

Answer: small quantity of current are expressed in miliampere  or in microampere.

Question :1 milliampere and 1 microampere is equal to ?

Answer :1mA = 10^-3 A   and  1µA = 10^-6 A

Question: Which instrument is used to measure electric current in a circuit?

Answer Ammeter.

Question :Write an electric current unit in ascending order? 

Answer :Unit is ampere 

Microampere, milliampere, ampere. 

Question : In which direction does the electric current flows ?

Answer : the electric current flows in the circut from the positive terminal of the cell to the negative terminal of the cell .

Question :How does a metal conduct electricity? 

Answer :Metals conduct electricity by moving or transferring its electron to another atom in metal.

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Electric Potential Difference

Question :What makes the charge flow? 

Answer :Potential difference

Question:Why does the cell have to expend its chemical energy stored in it? 

Answer : in order to maintain the current in a given electric circuit.

Question :What is the potential difference? 

Answer :When electrons move only if there is a difference of electric pressure, called potential difference. 

Question :Define electric potential difference with formula. 

Answer :Electric potential difference between the two points in an electric circuit carrying some current from one point to another. 

FORMULA :V=W/Q. 

Question :What is the SI unit of potential difference ?

Answer : SI unit is Volt(V). 

Question :Which device is used to measure V? 

Answer :Voltmeter. 

Question: Why is the voltmeter connected in parallel ?

Answer Voltmeter is Connected in parallel because, to measure potential difference of two ends of a resistor.

Question : Who was Alessandro volta?

Answer : He was an Italian physicist.

Question :Explain how 1 volt = 1 joule /1 coulomb? 

Answer :When 1 joule of work is done to move a charge of one coulomb from one point to the other so we can call it 1 volt = 1 joule/1 coulomb.

Question :Voltmeter is always connected…….. 

1. Vertical
2. Series 
3. Parallel 
4. Horizontal 

Question : Ammeter is connected in ……..

   1- parallel

   2- series

Question: Who discovered ampere law ?

 Answer:Andre Marie Ampere.

Question: What is the SI unit of time?

Answer: Second.

Question: What is the formula of current with charge?

Answer: FORMULA: I=Q/t.

Question: 1 volt is equal to…

Answer : 1V =1J/1C. 

Ohm’s Law

Question :Who found the relationship between current and potential difference? 

Answer :German physicist George Simon Ohm.

Question :Explain ohm’s law? 

Answer : The potential difference across the ends of a given metallic wire. its temperature remains the same, called ohm’s law. 

Where, V=IR

If the potential difference is across the two ends of a conductor is 1V and the the current is one ampere then, 

1 ohm=1 volt /ampere 

:The current flow through the resistor is inversely proportional to resistance. 

Questions: What is resistance ?

Answer: It is the property of a conductor to resist the flow of charge.

Questions: Who discovered the ohm?

Answer: Georg Simon ohm.

Questions: Who is Georg Simon ohm?

Answer: He is a German physicist.

Questions: Formula of current?

Answer: I=V/R.

Questions: What is the SI unit of resistance?

Answer: ohm

Questions: Which component is used to regulate electric current without changing the voltage?

Answer:Variable resistance. 

Questions: Which device is used to change the resistance in the circuit?

Answer: Rheostat 

Questions: What is a resistor?

Answer:  a conductor having some applicable resistance is called a resistor. 

Questions: What is a good and poor conductor of electricity?

Answer: a component of a given size that offers a low resistance is a good conductor.

              a component of an identical size that offers a higher resistance is a poor conductor. 

Questions:  what is an insulator?

Answer:  a component of the same size give even higher resistance than the poor conductor in which the electricity does not pass through it.

Factors on which the resistance of a conductor depends 

Questions :What are the three factors on which resistance of the conductor depends? 

Answer:1) On its length 

2)On its area of cross section 

3)On the nature of its material. 

Question :Is  there a relation between R and l and A? 

Answer yes,R is directly propostional to L and A is inversly prpostional to R.

Questions: Which unit is constant in electrical resistivity?

Answer: rho is a constant.

Question what will you observe when the when we increase thickness of wire of the same material and of the same length 

Answer we observed that the ammeter reading is increase because Resistivity of the wire will be less  

Questions :Define electrical resistivity and its SI unit? 

Answer:Where rho is a constant of proportionality and called electrical resistivity of the material of the conductor and its SI unit is ohm m. 

Questions :Write the name of alloy or metal which has low resistivity? .

Answer: Metal which has low resistivity silver,copper,aluminium,Tungsten, etc.

Alloys which has low resistivity are constantan,Maganin, nichrome 

Question: What is the electrical resistivity of silver and copper?

AnswerElectrical resistivity of silver 1.60 x10^-8.

Electrical resistivity of copper 1.62 x 10^-8.

Question: What is the resistivity of rubber and glass?

Answer Insulators like rubber and glass have resistivity of the order of 10¹² to 10¹⁷ ohm metres.

Question :Why is alloy used for conducting electricity?f FFFd

Answer :resistivity of  an alloy is generally higher than that of its constituents.Alloys do not oxidise readily at high temperature. For this reason they are used for conducting electricity.

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Question: Does the e www r Reddy of resistivity of material vary with temperature.

Answer yes.

• Questions : Why is tungsten used in bumilroflb filamentrd

Answer:Because tungsten has high resistivity as well  be vmbas compared  f deto copper and aluminium. Bff

Resistance of a system of resistors 

Question: In how many ways resistors can be connected and explained?

Answer:Resistors can be connected in series and parallel. Oo FB b

1)Resistors in parallel :combination of resistors in which one or more resistors jare connected together betwelen a point, hence said to be parallel. 

2)Resistors in series :In an electric circuit where one or lftb g hu fv VVji kimore resd cistors having resistance and joining end to end, hence are said to be series. 

Questions What effect does happens to the  voltage and current when resistors is connected in series 

Answer:W c ee khen the resistor is connected in series the vol.ttage will be different at all points but current is constant in the k. circuit.

Que stions What effect does happen to the DDd and VG  when resistor is connected in parallel

Answer: When the resistor is connected in parallel the voltage remains constant but the current will be diffdx DC d DD mmmcdderent at different points of circuit. 

Questions: What is the formula of resistors in series? 

Answer: R= R1+R2+R3.f 

 c

Cdc rrd: pdWhat is the Formula of a resistor in parallel?

Answddder: 1/R=1/R1+1/R2+1/R3.

c:cccc the disadvantage of a series circuit?

Answer:  when series circuit is that when d DD c

c: f is the advantage of parallel circuits? Ex xsx DCC d DC xx ex xsx DD RR x 

Answer: A parallel circuit divides the DD DD cf CR DD through the electric gadget,the total  xd xd is helpful particularly wvv BChen each gadget has different resistance and reequirees different curr DD DD cdcdc Dent to c properly this type of circuit is majorly used at home electric wiring.s XD e DD f de c ee

Heating effect of electric current 

When an dy electric fan becomes warm this shows which effect of electric current?

Answer: heating effect of electric currendt.

•  VG JB jn

Questions: What is the heating effect of electric current?d

DD xx gets dissipated entirely in the form of heat, this is known as the heating effect of electric current.

Question s Heating effect of electric current is utilised by which devices?

Answer: devices such as electric heater, electric iron etc. 

Question :To maintain the current, the source has to expand its energy but where does its energy go? 

Answer : this energy get dissipated in the resistor as heat 

BB kk kb BB kk in parallel 

Question:The power input to the circuit by the source. Explain with formula? 

Answer :Let t be hmmthe time d i ki koi l kbh iring ok BB VG LLP  which a charge Q flows across.

The work done in moving the charge through a potential differuence V is VQ therefore,the source must supply energy equal to o in time t hence the power input tol.

Questions: What is the joules hulaw of heating?

Answer: the energy dissipated in the resistor as heat thus for a stu gdy current I the amount of heat produced in a time t e Ti is this is known as a joule’s  law of heating.

Questions: What does joule’s law of heating imply?

Answer:The law implies that heat produced in a resistor is

             1 directly proportional to the square of current for a given resistance,

             2 directly proportional to the resistance for a given current.

             3 directly proportional to the time for which the current flows through the resistor.

Question:Define voltage source? 

Answer : a voltage source is a two terminal device which can maintain a fixed  voltage.

Practical applications of heating effect of electric current 

Questions: What are the practical  applications of heating effect of electric current ?

Answer: Heating effect of electric current has many useful applications such as the electric laundry iron electric toaster electric oven electric kettle and electric heater are some of their devices based heating effect.

Question : Name some familiar devices based on joules heating? 

Answer :Electric geyser, electric heater, electric induction, electric iron, electric toaster.

Question: What is the other use of electric heating?

Answer:The electric heating is also used to produce light In a bulb.

Questions: Which metal is used to make filament of bulb?

Answer: Tungsten

Questions Why tungsten is used for making bulb filaments?

Answer: Because tungsten has a high melting point of 3380 C.

Questions: Which chemical gas is usually filled in a bulb?

Answer: The bulbs are usually filled with chemical inactive nitrogen and Argon gases to prolong the life of filament.

Questions: What is the use of a fuse?

Answer: It protects circuits and appliances by stopping the flow of any unduly high electric current.

Questions: Where the fuse is placed in the circuit?

Answer: The fuse is placed in series with the devices in the circuit.

Questions: What is a fuse?

Answer: Fuse is a piece of wire made up of metal or an alloy of appropriate melting point.

Questions: What happens if a current larger than a specific value flows through the circuit when the fuse is connected?

Answer: When the fuses connected in a circuit the temperature of the fuse wire will be increased and this will melt the fuse wire and break the circuit.

Questions: What rate of fuse is used for domestic purposes?

Answer: the fuses used for domain purpose are rated  as 1A, 2A, 3A, 4A, 5A, 10A,etc

Questions: In which case the fuse must be used?

Answer: An electric iron which consumes 1kW electric power when operated at 220 V,a current of 1000/220 A  that is 4.54A will flow in the circuit. In this case a 5A fuse must be used.

Electric power 

Questions: What is electric power?

Answer: The rate at which electric energy is dissipated or consumed in an electric circuit is termed as electric power. 

The power is given by

P = VI

P = I²R = V^{2 kk}R

Questions: What is the SI unit of electric power? Ma

Answer:  Watt (W)

Questions: Define 1 watt ?

Answer: it is the power consumed by a device that carries 1A of current when operated at a potential difference of 1V.

1W = 1volt x 1ampere = 1 V A

Questions: What is the larger unit of watt?

Answer: kilowatt and it is equal to 1000 watts.

Questions: Define watt hour?

Answer:  when 1 watt of power is used for 1 hour (W h).

Questions: What is the commercial unit of electric energy?

Answer:  kilowatt hour (kW h). 

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Combination Reaction

A single product is formed from two or more reactants, is called Combination Reaction.

2Mg +O2→2MgO

Decomposition Reaction

A single reactant breaks down to yield two or more products , is calledDecomposition Reaction.

(a) Thermal decomposition 2Pb(NO3)2 → 2PbO + 4NO2 +O2 (b) Electrolysis 2H2O →2H2 +O2 (c) Photo chemical reaction 2AgBr →2Ag +Br2

Displacement Reaction

One element is displaced by another element , is called Displacement Reaction.

Zn + CuSO4→ ZnSO4 + Cu

Double displacement reaction

Exchange of ions between reactants , is called Double displacement reaction.

AgNO3 +NaCl →AgCl +NaNO3

Redox reaction

Both oxidation and reduction take place simultaneously, is called Redox reaction.

CuO + H2 → Cu + H2O

Exothermic reaction – 

A chemical reaction in which heat energy is evolved, is called Exothermic reaction. 

C + O2 →CO2 (g) + heat

Endothermic reaction- 

A chemical reaction in which heat energy is absorbed , is called Endothermic reaction.

ZnCO3 + Heat →ZnO + CO2

Redox reaction- 

Chemical reaction in which both oxidation and reduction take place simultaneously , is called Redox reaction.  ZnO + C →Zn + CO

Oxidation- 

Reaction that involves the gain of oxygen or loss of hydrogen is called Oxidation.

Reduction – 

Reaction that shows the loss of oxygen or gain of hydrogen , is called Reduction.

Effects of oxidation reactions in our daily life – Corrosion , Rancidity

Preventive methods :- (a) Adding antioxidants to the food materials. (b) Storing food in air tight container (c) Flushing out air with nitrogen gas. (d) Refrigeration.

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Question 1 Which of the following is not a physical change?

(A) Dissolving of salt in water

(B) LPG Combustion of salt

(C) Melting of ice

(D) Formation of water vapor

Question 2 Which of the following is an exothermic reaction

(A) Sublimation of camphor crystals

(B) Sublimation of dry ice

(C) Evaporation of water

(D) Reaction of water with limestone

Question 3   6Fe2O3 + 2Al → Al2O3 + 2Fe  is a

(A) Double displacement reaction

(B) Displacement reaction

(C) Combination Reaction

(D) Decomposition Reaction

Question 4  The addition of H2 and the reduction of O2 is called –

(A) Oxidation Reaction

(B) Corrosion Reaction

(C) Reduction reaction

(D) Redox reaction

Question 5 The reactions in which heat is absorbed are called –

(A) Evaporation Reaction

(B) exothermic reaction

(C) Combination Reaction

(D) exothermic reaction

Question 6 Which of the following is not a characteristic of a chemical change

(A)  change in temperature

(B) change in color

(C)  change in shape

(D) emission of gas

Question 7 The breakdown of food into carbon dioxide and water is a type of –

(A) Evaporation Reaction

(B) exothermic reaction

(C) Combination Reaction

(D) exothermic reaction

Question 8  What is the name of the acid which dissolves gold and platinum?

(A) Nittic Acid

(B) Hydrochloric acid

(C) Aqua regia

(D) All of these

Question  9 The substances which take part in a chemical reaction are called –

(A) Atom

(B) Compound

(C) Reactant

(D) Product

Question 10 Dried fruits rot if not consumed for a long time because –

(A) Rusting

(B) Change in temperature

(C) Corrosion

(D) Pernicious odor

Chemical Reactions and Equations MCQ

Answers:-

Question 1 Which of the following is not a physical change?

(A) Dissolving of salt in water

(B) LPG Combustion of salt

(C) Melting of ice

(D) Formation of water vapor

Question 2 Which of the following is an exothermic reaction

(A) Sublimation of camphor crystals

(B) Sublimation of dry ice

(C) Evaporation of water

(D) Reaction of water with limestone

Question 3  6Fe2O3 + 2Al → Al2O3 + 2Fe  is a

(A) Double displacement reaction

(B) Displacement reaction

(C) Combination Reaction

(D) Decomposition Reaction

Question 4 The addition of H2 and the reduction of O2 is called –

(A) Oxidation Reaction

(B) Corrosion Reaction

(C) Reduction reaction

(D) Redox reaction

Question 5  The reactions in which heat is absorbed are called –

(A) Evaporation Reaction

(B) exothermic reaction

(C) Combination Reaction

(D) exothermic reaction

Question 6 Which of the following is not a characteristic of a chemical change

(A)  change in temperature

(B) change in color

(C)  change in shape

(D) emission of gas

Question 7 The breakdown of food into carbon dioxide and water is a type of –

(A) Evaporation Reaction

(B) exothermic reaction

(C) Combination Reaction

(D) exothermic reaction

Question 8  What is the name of the acid which dissolves gold and platinum?

(A) Nittic Acid

(B) Hydrochloric acid

(C) Aqua regia

(D) All of these

Question 9 The substances which take part in a chemical reaction are called –

(A) Atom

(B) Compound

(C) Reactant 

(D) Product

Question 10 Dried fruits rot if not consumed for a long time because –

(A) Rusting

(B) Change in temperature

(C) Corrosion

(D) Pernicious odor

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NCERT Class 10 Notes

Resource and Development Class 10

Earth Summit Short Note

Making of Germany and Italy

Visualization of The Nation

The Age of Revolution: 1830-1848

Class 10 History Chapter 1 Very Short Questions

French Revolution and the Idea of ​​the Nation

Rise of Nationalism in Europe Intro

Suffrage Class 10 SSt

Aristocrat class Class 10 SSt

Napoleon Class 10 SSt

French Revolution Class 10 SST

Rise of Nationalism in Europe

NCERT CLASS 10 SCIENCE PAGE 164 ONE LINERS

NCERT CLASS 10 SCIENCE PAGE 161 ONE LINERS

NCERT CLASS 10 SCIENCE PAGE 160 ONE LINERS

Chapter 3 Metals and Non-metals

Class 10 Science table 2.2

Chemical Reactions and Equations MCQ

Human Digestive System

Corrosion MCQ Class 10

Acid Base & Salt Lesson -2 FORMULAS LIST Class 10

Chemical Formulas list for Class 10 Science Chapter 1

Why did nationalist tensions emerge in the Balkans

How was the history of nationalism in Britain

Through focus how nations developed over the nineteenth century

Choose three examples to show the contribution of culture …

Explain what is meant by the 1848 revolution of the liberals

The Rise of Nationalism in Europe

Class 10 Surdas सूरदास

What changes did Napoleon make …

Briefly explore the process of German integration?

Who were Marian and Germania?

What steps did the French revolutionaries take to create …

Role of women in nationalist struggles

Frankfurt parliament

Greek independence war

Count Camilo de Kavur

Giuseppe Metsini

A LETTER TO GOD LESSON 1 Class 10

Types of Chemical Reactions

Burning of magnesium in air

Class 10 Fire and Ice Poem Explanation, Summary, Difficult words

Parts of The Female Reproductive System

wooden article was made ……. Ex 13.1 9

MULTI-PURPOSE RIVER PROJECTS  

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MCQ Chapter 14 CHEMICAL EFFECT OF ELECTRIC CURRENT

Choose the correct answer:

Congratulations on completing the MCQ quiz on Chapter 14 - Chemical Effects of Electric Current. We hope this quiz has helped you to test your understanding of the basic concepts of electric current and its chemical effects such as electrolysis and electroplating. Keep learning and exploring!

The post MCQ Chapter 14 CHEMICAL EFFECT OF ELECTRIC CURRENT appeared first on .

Q. 1 What is the chemical formula of rust?

(1) Fe2O3

(2) Fe2O3.xH2O

(3) FeCO3

(4) FeCO3.xH2O

Ans: (1) Fe2O3

Q. 2 What is required for iron to rust?

(1) water

(2) Air

(3) its open surface

(4) All of the above.

Ans: (4) All of the above.

Q. 3 Rusting is a type of:

(1) Reduction Reaction

(2) Displacement Reaction

(3) Oxidation Reaction

(4) Decomposition Reaction

Ans: (3) Oxidation Reaction

Q. 4 How can items made of iron be prevented from corrosion?

(1) Paint

(2) Oil

(3) Oil paint

(4) All of the above

Ans: (4) All of the above

Q. 5 What is rust primarily composed of?

(1) Hydrated Iron (III) Oxide

(2) Hydrated Iron (II) Oxide

(3) Hydrated Iron (VI) Oxide

(4) Hydrated Iron (IV) Oxide

Ans: (1) Hydrated Iron (III) Oxide

Q. 6 How can iron be protected from corrosion by the application of a layer?

(1) Chromium

(2) Nickel

(3) Zinc

(4) All of the above

Ans: (4) All of the above

Q. 7 Which metal is least prone to corrosion?

(1) Iron

(2) Aluminum

(3) Gold

(4) None of them

Ans: (3) Gold

Q. 8 What is the most suitable method to protect an iron fry pan from rust?

(1) Greasing

(2) Oil Painting

(3) Layer of Zinc

(4) All of the above

Ans: (3) Layer of Zinc

Q. 9 What is the process called when a layer of oxygen forms on the surface of aluminum?

(1) Anodizing

(2) Rusting

(3) Catenation

(4) Galvanization

Ans: (1) Anodizing

Q. 10 What metal is used to create galvanized iron?

(1) Chromium

(2) Nickel

(3) Zinc

(4) Oil

Ans: (3) Zinc

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