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Basic Electricity Complete Notes for Railway ALP & Technician | प्रारंभिक वैद्युतिकी के संपूर्ण नोट्स – रेलवे ALP एवं टेक्नीशियन
27 Aug 2026 • ALP AND TECHNICIAN NOTES

Basic Electricity Complete Notes for Railway ALP & Technician | प्रारंभिक वैद्युतिकी के संपूर्ण नोट्स – रेलवे ALP एवं टेक्नीशियन

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ALP AND TECHNICIAN NOTES Question Bank

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ALP AND TECHNICIAN NOTES Questions

20 questions found
Q1

What is electrical resistance?

विद्युत प्रतिरोध क्या है?
Answer
The property of a material that opposes the flow of electric current / पदार्थ का वह गुण जो विद्युत धारा के प्रवाह का विरोध करता हैOpen full set →
Q2

What is the SI unit of electrical resistance?

विद्युत प्रतिरोध का SI मात्रक क्या है?
Answer
Ohm / ओमOpen full set →
Q3

Which formula represents the resistance of a uniform conductor?

एक समान चालक के प्रतिरोध को कौन-सा सूत्र प्रदर्शित करता है?
Answer
R = ρL/A / R = ρL/AOpen full set →
Q4

What is the SI unit of resistivity?

प्रतिरोधकता का SI मात्रक क्या है?
Answer
Ohm metre / ओम-मीटरOpen full set →
Q5

If the length of a wire is doubled without changing its area and material, its resistance becomes:

यदि किसी तार की लंबाई दोगुनी कर दी जाए तथा क्षेत्रफल और पदार्थ अपरिवर्तित रहें, तो उसका प्रतिरोध कितना होगा?
Answer
Double / दोगुनाOpen full set →
Q6

If the cross-sectional area of a conductor becomes three times while all other factors remain constant, its resistance becomes:

यदि चालक का अनुप्रस्थ क्षेत्रफल तीन गुना हो जाए और अन्य कारक अपरिवर्तित रहें, तो उसका प्रतिरोध कितना हो जाएगा?
Answer
Q7

Resistance of a circular wire is inversely proportional to:

वृत्ताकार तार का प्रतिरोध किसके व्युत्क्रमानुपाती होता है?
Answer
Square of its radius / उसकी त्रिज्या का वर्गOpen full set →
Q8

A wire of resistance 900 Ω has its radius increased to 3/2 times its original value. If length remains unchanged, what is the new resistance?

900 Ω प्रतिरोध वाले तार की त्रिज्या को मूल मान का 3/2 गुना कर दिया जाता है। यदि लंबाई अपरिवर्तित रहे, तो नया प्रतिरोध कितना होगा?
Answer
400 Ω / 400 ΩOpen full set →
Q9

A wire is stretched to twice its original length without change in volume. Its new resistance becomes:

किसी तार को आयतन अपरिवर्तित रखते हुए उसकी मूल लंबाई से दोगुना खींचा जाता है। उसका नया प्रतिरोध कितना होगा?
Answer
Q10

In a positive temperature coefficient material, what happens to resistance when temperature increases?

धनात्मक ताप गुणांक वाले पदार्थ में तापमान बढ़ने पर प्रतिरोध का क्या होता है?
Answer
It increases / यह बढ़ता हैOpen full set →
Q11

Which of the following commonly shows a negative temperature coefficient of resistance?

निम्नलिखित में से कौन सामान्यतः ऋणात्मक ताप गुणांक प्रदर्शित करता है?
Answer
Thermistor / थर्मिस्टरOpen full set →
Q12

Which formula approximately gives resistance at a new temperature t2 when resistance at t1 is known?

यदि t1 तापमान पर प्रतिरोध ज्ञात हो, तो t2 तापमान पर प्रतिरोध का लगभग मान किस सूत्र से प्राप्त होता है?
Answer
Rt2 = Rt1[1 + α(t2 − t1)] / Rt2 = Rt1[1 + α(t2 − t1)]Open full set →
Q13

In a four-band resistor colour code, the fourth band represents:

चार-बैंड प्रतिरोधक कलर कोड में चौथा बैंड किसे दर्शाता है?
Answer
Tolerance / सहनशीलताOpen full set →
Q14

In a five-band resistor code, how many bands normally represent significant digits?

पाँच-बैंड प्रतिरोधक कोड में सामान्यतः कितने बैंड सार्थक अंकों को दर्शाते हैं?
Answer
Three / तीनOpen full set →
Q15

What digit does the red colour represent in resistor colour coding?

प्रतिरोधक कलर कोड में लाल रंग किस अंक को दर्शाता है?
Answer
Q16

What tolerance is represented by a gold band on a resistor?

प्रतिरोधक पर सोने का बैंड कितनी सहनशीलता दर्शाता है?
Answer
Q17

A 200 Ω resistor has a tolerance of ±5%. What is its maximum possible resistance?

200 Ω प्रतिरोधक की सहनशीलता ±5% है। उसका अधिकतम संभावित प्रतिरोध कितना होगा?
Answer
210 Ω / 210 ΩOpen full set →
Q18

In BS 1852 resistor notation, the letter K represents which multiplier?

BS 1852 प्रतिरोधक कूट में K किस गुणज को दर्शाता है?
Answer
Q19

What resistance is represented by the BS 1852 code 4R7J?

BS 1852 कूट 4R7J किस प्रतिरोध को दर्शाता है?
Answer
4.7 Ω ±5% / 4.7 Ω ±5%Open full set →
Q20

What does the code 6K8F represent?

6K8F कूट क्या दर्शाता है?
Answer
6.8 kΩ ±1% / 6.8 kΩ ±1%Open full set →
QUICK PRACTICE

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Q1

What is electrical resistance?

विद्युत प्रतिरोध क्या है?

  1. The property of a material that opposes the flow of electric currentपदार्थ का वह गुण जो विद्युत धारा के प्रवाह का विरोध करता है
  2. The ability of a material to produce electric chargeपदार्थ की विद्युत आवेश उत्पन्न करने की क्षमता
  3. The rate of flow of electric chargeविद्युत आवेश के प्रवाह की दर
  4. The electrical energy consumed per secondप्रति सेकंड उपभोग की गई विद्युत ऊर्जा
Check answer
Answer: The property of a material that opposes the flow of electric current / पदार्थ का वह गुण जो विद्युत धारा के प्रवाह का विरोध करता है

Electrical resistance is the property of a conductor or material by which it opposes the flow of electric current. It is represented by R and its SI unit is ohm, symbol Ω. For a uniform conductor, resistance is given by R = ρL/A, where ρ is resistivity, L is the length of the conductor and A is its cross-sectional area. This relation shows that a longer conductor has more resistance, while a thicker conductor has les

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Q2

What is the SI unit of electrical resistance?

विद्युत प्रतिरोध का SI मात्रक क्या है?

  1. Voltवोल्ट
  2. Ampereएम्पियर
  3. Ohmओम
  4. Coulombकूलाम
Check answer
Answer: Ohm / ओम

The SI unit of electrical resistance is the ohm, represented by the Greek letter Ω. From Ohm's law, R = V/I. Therefore, one ohm is the resistance of a conductor when a potential difference of one volt produces a current of one ampere through it. Thus, 1 Ω = 1 V/A. Volt is the unit of potential difference, ampere is the unit of electric current and coulomb is the unit of electric charge. Resistance is a very important

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Q3

Which formula represents the resistance of a uniform conductor?

एक समान चालक के प्रतिरोध को कौन-सा सूत्र प्रदर्शित करता है?

  1. R = ρL/AR = ρL/A
  2. R = ρA/LR = ρA/L
  3. R = LA/ρR = LA/ρ
  4. R = ρLAR = ρLA
Check answer
Answer: R = ρL/A / R = ρL/A

The resistance of a uniform conductor is R = ρL/A. Here, ρ represents the resistivity of the material, L is the length of the conductor and A is its cross-sectional area. The equation shows that resistance is directly proportional to length and resistivity and inversely proportional to cross-sectional area. Therefore, if the same material is made into a longer wire, its resistance increases. If the wire is made thick

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