CUET UG Physics Booster Test 3-Transformers and Energy Transmission -

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CUET UG Physics Booster Test 3-Transformers and Energy Transmission

⏱️ 30 Minutes

❓ 20 Questions

📌 Answers are locked once submitted — results and explanations appear at the end.

CUET UG Physics Booster Test 3-Transformers and Energy Transmission

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QUESTION 1 OF 20

Consider the statements regarding transformer induction. Choose the correct statements.
1. An alternating voltage applied to the primary creates a static magnetic field.
2. The alternating flux links the secondary and induces an emf in it.
3. The principle of mutual induction dictates this energy transfer.
4. Direct current cannot produce the continuously changing alternating flux.

Answer Review

1 Consider the statements regarding transformer induction. Choose the correct statements.
1. An alternating voltage applied to the primary creates a static magnetic field.
2. The alternating flux links the secondary and induces an emf in it.
3. The principle of mutual induction dictates this energy transfer.
4. Direct current cannot produce the continuously changing alternating flux.

A 1, 3, 4

B 2, 3, 4

C 1, 2, 3

D 1, 2, 4

💡 Short Explanation

�� Transformer works on mutual induction. �� Alternating flux links both coils. �� DC cannot maintain continuously changing flux.

✅ Correct Answer Explanation

Statement 2 is correct because alternating current in the primary produces a changing magnetic flux that links the secondary and induces emf according to Faraday's law. Statement 3 is correct because energy transfer in a transformer occurs through mutual induction between the primary and secondary coils. Statement 4 is correct because direct current produces essentially constant magnetic flux after the transient period, so continuous emf is not induced in the secondary. Statement 1 is incorrect because alternating voltage produces an alternating magnetic field, not a static magnetic field. Therefore, statements 2, 3, and 4 are correct.

❓ Why Other Options Are Incorrect

�� Option A → Includes Statement 1, which is incorrect.
�� Option C → Includes Statement 1, which is incorrect.
�� Option D → Includes Statement 1, which is incorrect.

🎯 Strategy

Used

Elimination

Application:

Eliminate all options containing Statement 1 because alternating voltage cannot create a static magnetic field.

Final Logic:

Only Option B contains all correct statements and excludes Statement 1.

🧠 Memory Trick

AC → Alternating Flux → Mutual Induction

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Transformer Principle and Mutual Induction

2 Regarding the core of a typical transformer,
1. it must be made of hard steel to retain permanent magnetism.
2. it is made of soft-iron to facilitate alternating magnetic flux linkage.
3. it physically conducts electrical current between the primary and secondary.
4. the coils wound on it are completely uninsulated.

A 1

B 2

C 3

D 4

💡 Short Explanation

�� Soft iron has low hysteresis loss. �� Core guides magnetic flux. �� Primary and secondary remain electrically isolated.

✅ Correct Answer Explanation

Statement 2 is correct because transformer cores are generally made of soft iron or silicon steel to provide an easy path for alternating magnetic flux and reduce energy losses. Statement 1 is incorrect because permanent magnetism is undesirable in transformer cores. Statement 3 is incorrect because there is no direct electrical connection between primary and secondary windings. Statement 4 is incorrect because transformer windings are insulated to prevent short circuits.

❓ Why Other Options Are Incorrect

�� Option A → Hard steel is unsuitable because it retains magnetism.
�� Option C → Core transfers magnetic flux, not electrical current.
�� Option D → Windings must be insulated.

🎯 Strategy

Used

Elimination

Application:

Identify the only statement consistent with transformer construction.

Final Logic:

Soft iron core is the standard transformer core material.

🧠 Memory Trick

Soft Core → Smooth Flux

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Transformer Construction

3 Choose the incorrect statement about the primary coil
1. It acts as the input coil of the transformer.
2. A back emf is induced in it due to the alternating flux.
3. Its resistance is strictly assumed to be very large in an ideal transformer.
4. The induced emf ep is assumed to be equal to the applied voltage vp.

A 1

B 2

C 3

D 4

💡 Short Explanation

�� Primary is input winding. �� Back emf exists in primary. �� Ideal transformer assumes negligible resistance.

✅ Correct Answer Explanation

Statement 3 is incorrect because an ideal transformer assumes negligible resistance in the windings. Large resistance would produce power losses and heating. Statements 1, 2, and 4 are correct. The primary receives input voltage, experiences self-induced back emf, and in ideal conditions the induced emf approximately equals the applied voltage.

❓ Why Other Options Are Incorrect

�� Option A → Primary is indeed the input coil.
�� Option B → Back emf is induced in the primary.
�� Option D → ep ≈ vp in an ideal transformer.

🎯 Strategy

Used

Elimination

Application:

Identify the statement violating ideal transformer assumptions.

Final Logic:

Ideal transformers have negligible winding resistance, not large resistance.

🧠 Memory Trick

Ideal = Zero Loss = Tiny Resistance

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Ideal Transformer Assumptions

4 If the secondary circuit is an open circuit or the current taken from it is small,
1. the induced emf es automatically drops to zero
2. the current taken from it is assumed to be infinitely large
3. the voltage across the secondary vs is a good approximation to es
4. the alternating flux permanently fails to link to the secondary coil

A 1

B 2

C 3

D 4

💡 Short Explanation

�� Open circuit means negligible current. �� Induced emf still exists. �� Terminal voltage nearly equals induced emf.

✅ Correct Answer Explanation

Statement 3 is correct because when the secondary current is negligible, voltage drop across the secondary winding is very small. Therefore, terminal voltage is approximately equal to induced emf. Statements 1, 2, and 4 are incorrect because emf still exists, current is not infinite, and magnetic flux continues to link both windings.

❓ Why Other Options Are Incorrect

�� Option A → Induced emf does not become zero.
�� Option B → Open circuit means current is nearly zero.
�� Option D → Flux linkage still exists.

🎯 Strategy

Used

Elimination

Application:

Remove physically impossible statements.

Final Logic:

Small current implies negligible voltage drop, giving vs ≈ es.

🧠 Memory Trick

Open Circuit → Voltage Present, Current Absent

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Secondary Voltage in Transformer

5 The mathematical relationship linking primary and secondary voltages to their respective turns is:

A vs / vp = Np / Ns

B vp / vs = Ns / Np

C vs / vp = Ns / Np

D vs vp = Ns Np

💡 Short Explanation

�� Voltage is proportional to turns. �� Transformer ratio comes from Faraday's law. �� More turns produce more induced voltage.

✅ Correct Answer Explanation

For an ideal transformer, vs / vp = Ns / Np The induced emf in a coil is proportional to the number of turns. Therefore, the ratio of secondary voltage to primary voltage equals the ratio of secondary turns to primary turns. Options A and B reverse the relationship. Option D is dimensionally incorrect.

❓ Why Other Options Are Incorrect

�� Option A → Inverse relation written incorrectly.
�� Option B → Opposite ratio.
�� Option D → Not the transformer equation.

🎯 Strategy

Used

Formula Recall / Elimination

Application:

Use the standard transformer equation directly.

Final Logic:

Voltage ratio equals turns ratio.

🧠 Memory Trick

V follows N

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Transformer Turns Ratio

6 Consider the statements regarding the ideal transformer voltage ratio. Choose the correct statements.
1. It assumes extremely little flux escapes from the core.
2. It assumes the primary current and resistance are very small.
3. It assumes the secondary current is small.
4. It works without relying on Faraday's law of induction.

A 1, 2, 3

B 2, 3, 4

C 1, 3, 4

D 1, 2, 4

💡 Short Explanation

�� Flux leakage is negligible. �� Winding resistance is negligible. �� Faraday's law is essential.

✅ Correct Answer Explanation

Statements 1, 2, and 3 are accepted assumptions used in deriving the ideal transformer relationship. Statement 4 is incorrect because Faraday's law forms the basis of transformer operation and voltage ratio derivation. Hence statements 1, 2, and 3 are correct.

❓ Why Other Options Are Incorrect

�� Option B → Includes Statement 4.
�� Option C → Includes Statement 4.
�� Option D → Includes Statement 4.

🎯 Strategy

Used

Elimination

Application:

Reject any option containing Statement 4.

Final Logic:

Transformer theory fundamentally depends on Faraday's law.

🧠 Memory Trick

Transformer = Faraday in Action

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Ideal Transformer Assumptions

7 Match List I with List II regarding transformer efficiency

List I	List II
1. 100% Efficiency	a. Equal to ip × vp
2. 95% Efficiency	b. Achievable in well-designed actual transformers
3. Power Input	c. Theoretical ideal assumption where no energy is lost
4. Power Output	d. Equal to is × vs

A 1-c, 2-b, 3-a, 4-d

B 1-b, 2-c, 3-d, 4-a

C 1-a, 2-d, 3-c, 4-b

D 1-d, 2-a, 3-b, 4-c

💡 Short Explanation

�� 100% efficiency is ideal. �� Practical transformers have slightly lower efficiency. �� Input and output power definitions are standard.

✅ Correct Answer Explanation

1 → c because 100% efficiency is the ideal no-loss condition. 2 → b because efficiencies around 95% are achievable in practice. 3 → a because input power equals ip × vp. 4 → d because output power equals is × vs. Thus Option A is correct.

❓ Why Other Options Are Incorrect

�� Option B → Interchanges ideal and practical efficiency definitions.
�� Option C → Incorrectly matches power expressions.
�� Option D → Multiple mismatched pairs.

🎯 Strategy

Used

Option Grouping

Application:

Match definitions with their corresponding physical meanings.

Final Logic:

Only Option A provides all correct pairings.

🧠 Memory Trick

Ideal–100, Practical–95

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Transformer Efficiency

8 If efficiency is ideal, the relationship between primary and secondary power is an exact ________, making the transformer a device that merely ________ energy form without violating conservation laws.

A Equality, Generates

B Equality, Transforms

C Inequality, Transforms

D Inequality, Consumes

💡 Short Explanation

�� Input power equals output power. �� Energy is conserved. �� Transformer changes voltage-current combination.

✅ Correct Answer Explanation

For an ideal transformer: Power Input = Power Output The transformer does not create energy. It only transforms electrical energy from one voltage-current combination to another. Hence "Equality" and "Transforms" are correct.

❓ Why Other Options Are Incorrect

�� Option A → Transformer does not generate energy.
�� Option C → Power equality exists ideally.
�� Option D → Transformer does not consume all supplied power.

🎯 Strategy

Used

Contextual/Tonal Matching

Application:

Match transformer operation with conservation of energy.

Final Logic:

Ideal transformer transforms energy without changing total power.

🧠 Memory Trick

Transform, Don't Create

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Ideal Transformer Power Relation

9 In an ideal transformer, the primary voltage is 200 V and the secondary voltage is 1000 V. If the secondary current is 2 A, what is the primary current?

A 0.4 A

B 2 A

C 10 A

D 50 A

💡 Short Explanation

�� Ideal power is conserved. �� vp ip = vs is. �� Current varies inversely with voltage.

✅ Correct Answer Explanation

Using vp ip = vs is 200 × ip = 1000 × 2 ip = 2000 / 200 ip = 10 A Therefore the primary current is 10 A.

❓ Why Other Options Are Incorrect

�� Option A → Too small.
�� Option B → Ignores power conservation.
�� Option D → Excessively large.

🎯 Strategy

Used

Substitution

Application:

Substitute values into the ideal transformer power equation.

Final Logic:

Current increases inversely as voltage decreases.

🧠 Memory Trick

High V → Low I

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Ideal Transformer Calculations

10 Identify the incorrect statement about high tension power transmission
1. High voltage leads to a proportionally lower transmission current.
2. I²R heat losses are heavily minimized when current is small.
3. High tension transmission eliminates the need for any transformers.
4. Transformers at the generating station step up the voltage before long-distance transmission.

A 1

B 2

C 3

D 4

💡 Short Explanation

�� High voltage reduces current. �� Lower current reduces losses. �� Transformers are essential in transmission systems.

✅ Correct Answer Explanation

Statement 3 is incorrect because transformers are necessary to step up voltage for transmission and step down voltage for consumer use. Statements 1, 2, and 4 are correct and explain the basic principle of efficient power transmission.

❓ Why Other Options Are Incorrect

�� Option A → Correct transmission principle.
�� Option B → Correct explanation of reduced losses.
�� Option D → Standard transmission practice.

🎯 Strategy

Used

Elimination

Application:

Identify the statement contradicting real transmission systems.

Final Logic:

High-tension transmission depends heavily on transformers.

🧠 Memory Trick

Step-Up → Send → Step-Down

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Energy Transmission Using Transformers

11 For a step-up transformer, the mathematical ratio of secondary turns to primary turns must be:

A (Ns / Np) < 1

B (Ns / Np) > 1

C (Ns / Np) = 0

D (Ns / Np) < 0

💡 Short Explanation

�� Step-up transformers increase voltage. �� Voltage ratio equals turns ratio. �� Secondary turns must exceed primary turns.

✅ Correct Answer Explanation

For an ideal transformer: Vs / Vp = Ns / Np A step-up transformer increases voltage, meaning Vs > Vp. Therefore, the turns ratio must also be greater than one. Hence: Ns / Np > 1 Options A, C, and D contradict the operating principle of a step-up transformer.

❓ Why Other Options Are Incorrect

�� Option A → Represents a step-down transformer.
�� Option C → Would imply no secondary turns.
�� Option D → Number of turns cannot be negative.

🎯 Strategy

Used

Substitution

Application:

Apply the transformer ratio equation directly.

Final Logic:

Higher secondary voltage requires more secondary turns.

🧠 Memory Trick

Step-Up → Turns Up

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Step-Up Transformer

12 Consider the statements regarding the step-up transformer. Choose the correct statements.
1. They elevate the alternating voltage.
2. They decrease the alternating current proportionally.
3. They fundamentally violate the law of conservation of energy.
4. They operate strictly with Ns > Np.

A 1, 3, 4

B 1, 2, 3

C 1, 2, 4

D 2, 3, 4

💡 Short Explanation

�� Voltage increases. �� Current decreases. �� Energy conservation remains valid.

✅ Correct Answer Explanation

Statement 1 is correct because a step-up transformer raises voltage. Statement 2 is correct because in an ideal transformer, current decreases when voltage increases to conserve power. Statement 4 is correct because a step-up transformer requires more secondary turns than primary turns. Statement 3 is incorrect because transformers obey conservation of energy. Therefore, statements 1, 2, and 4 are correct.

❓ Why Other Options Are Incorrect

�� Option A → Includes Statement 3.
�� Option B → Includes Statement 3.
�� Option D → Includes Statement 3.

🎯 Strategy

Used

Elimination

Application:

Remove any option containing the incorrect Statement 3.

Final Logic:

Transformers conserve energy and do not violate physical laws.

🧠 Memory Trick

High V, Low I

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Step-Up Transformer Characteristics

13 In analytical terms, a step-down transformer functions by ensuring that the voltage is reduced, which mathematically requires that

A Ns is strictly less than Np, making the ratio Ns/Np less than unity

B Ns is strictly greater than Np, making the ratio Ns/Np greater than unity

C Ns exactly equals Np to maintain electromagnetic equilibrium

D the primary coil is completely removed from the soft-iron core

💡 Short Explanation

�� Step-down transformers reduce voltage. �� Turns ratio determines voltage ratio. �� Fewer secondary turns give lower voltage.

✅ Correct Answer Explanation

For an ideal transformer: Vs / Vp = Ns / Np To reduce voltage: Vs < Vp Therefore: Ns < Np and Ns / Np < 1 Hence Option A is correct.

❓ Why Other Options Are Incorrect

�� Option B → Represents a step-up transformer.
�� Option C → Gives equal voltages.
�� Option D → Transformer cannot operate without the primary coil.

🎯 Strategy

Used

Substitution

Application:

Apply the transformer ratio equation.

Final Logic:

Reduced voltage requires fewer secondary turns.

🧠 Memory Trick

Step-Down → Turns Down

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Step-Down Transformer

14 Choose the correct statements about the necessity of voltage reduction
1. It provides safe operating voltages for household appliances (e.g., 240 V).
2. It occurs at area sub-stations near consumer localities.
3. It reverses the high tension transmission state to a highly usable state.
4. It actively increases the overall power generated by the grid.

A 1, 2, 3

B 2, 3, 4

C 1, 3, 4

D 1, 2, 4

💡 Short Explanation

�� Consumer appliances require lower voltages. �� Substations perform voltage reduction. �� Power generation is not increased.

✅ Correct Answer Explanation

Statements 1, 2, and 3 are correct because high transmission voltages must be reduced before supply to consumers. Statement 4 is incorrect because transformers do not generate power; they only change voltage and current levels. Therefore, statements 1, 2, and 3 are correct.

❓ Why Other Options Are Incorrect

�� Option B → Includes Statement 4.
�� Option C → Includes Statement 4.
�� Option D → Includes Statement 4.

🎯 Strategy

Used

Elimination

Application:

Remove options containing Statement 4.

Final Logic:

Transformers redistribute power but do not increase it.

🧠 Memory Trick

Transmit High, Use Low

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Power Transmission and Distribution

15 The physical arrangement of winding the primary and secondary coils one over the other

A deliberately increases the air gap to prevent internal sparking.

B is a method to reduce flux leakage so more flux links both coils.

C effectively eliminates the need for an iron core.

D causes a massive and uncontrollable increase in hysteresis loss.

💡 Short Explanation

�� Flux linkage should be maximum. �� Leakage flux reduces efficiency. �� Close winding improves coupling.

✅ Correct Answer Explanation

Winding the primary and secondary coils one over the other improves magnetic coupling. More magnetic flux produced by the primary links the secondary, reducing leakage flux and improving efficiency. Therefore Option B is correct.

❓ Why Other Options Are Incorrect

�� Option A → Not the purpose of coil arrangement.
�� Option C → Iron core is still required.
�� Option D → Coil arrangement does not cause hysteresis loss.

🎯 Strategy

Used

Contextual/Tonal Matching

Application:

Match the winding arrangement with transformer efficiency improvement.

Final Logic:

Closer windings maximize common flux linkage.

🧠 Memory Trick

Closer Coils → Better Coupling

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Flux Leakage Reduction

16 Match List I with List II concerning winding design constraints

List I	List II
1. Thick wire usage	a. Has higher electrical resistance per unit length
2. Thin wire usage	b. Reduces I²R loss effectively
3. High current winding	c. Corresponds to the low voltage side
4. Low current winding	d. Corresponds to the high voltage side

A 1-b, 2-a, 3-c, 4-d

B 1-a, 2-b, 3-d, 4-c

C 1-c, 2-d, 3-a, 4-b

D 1-d, 2-c, 3-b, 4-a

💡 Short Explanation

�� Thick wires reduce resistance. �� High current requires thicker conductors. �� High-voltage side carries lower current.

✅ Correct Answer Explanation

1 → b because thick wire lowers resistance and reduces I²R loss. 2 → a because thin wire has greater resistance per unit length. 3 → c because the low-voltage side carries higher current. 4 → d because the high-voltage side carries lower current. Thus Option A is correct.

❓ Why Other Options Are Incorrect

�� Option B → Reverses thick and thin wire characteristics.
�� Option C → Multiple mismatched pairs.
�� Option D → Incorrect current-voltage side associations.

🎯 Strategy

Used

Option Grouping

Application:

Match conductor properties with current and voltage requirements.

Final Logic:

Only Option A gives all physically correct pairings.

🧠 Memory Trick

High I → Thick Wire

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Transformer Loss Reduction

17 When the solid core is replaced by a ________ core, the magnitude of induced ________ is substantially reduced, preventing excessive energy loss as heating.

A Laminated, Eddy currents

B Solid, Hysteresis

C Laminated, Alternating flux

D Copper, Leakage flux

💡 Short Explanation

�� Eddy currents cause heating. �� Laminations increase resistance. �� Energy loss is reduced.

✅ Correct Answer Explanation

A laminated core breaks up large current loops into smaller paths, increasing resistance to eddy currents. This significantly reduces eddy current heating losses. Hence the correct completion is "Laminated, Eddy currents."

❓ Why Other Options Are Incorrect

�� Option B → Solid cores increase eddy currents.
�� Option C → Alternating flux is necessary for operation.
�� Option D → Copper is not used as transformer core material.

🎯 Strategy

Used

Contextual/Tonal Matching

Application:

Connect laminations with eddy current reduction.

Final Logic:

Laminations specifically target eddy current losses.

🧠 Memory Trick

Lamination Limits Loops

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Eddy Current Losses

18 Because the alternating magnetic field repeatedly reverses the magnetisation of the core,

A a magnetic material with low hysteresis loss is selected to keep heat dissipation minimal

B a perfectly non-magnetic material must be used instead

C the transformer eventually becomes a strong permanent magnet

D the primary current will instantaneously drop to zero to prevent overheating

💡 Short Explanation

�� Magnetization reverses continuously. �� Hysteresis causes energy loss. �� Low hysteresis materials are preferred.

✅ Correct Answer Explanation

Repeated reversal of magnetization causes hysteresis loss. To reduce heat production and improve efficiency, transformer cores are made from materials with low hysteresis loss, such as silicon steel. Therefore Option A is correct.

❓ Why Other Options Are Incorrect

�� Option B → Non-magnetic materials cannot efficiently guide flux.
�� Option C → Alternating magnetization prevents permanent magnet formation.
�� Option D → Current does not instantly become zero.

🎯 Strategy

Used

Elimination

Application:

Identify the statement that directly addresses hysteresis loss.

Final Logic:

Low hysteresis materials minimize magnetic energy loss.

🧠 Memory Trick

Low Hysteresis = Low Heat

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Hysteresis Loss

19 A power plant generates 100 kW of power at 1000 V. If it is stepped up by a transformer with Ns/Np = 10 for transmission, what is the current in the transmission line? (Assume ideal transformer)

A 100 A

B 10 A

C 1000 A

D 10000 A

💡 Short Explanation

�� Step-up transformer increases voltage. �� Power remains constant ideally. �� Current decreases proportionally.

✅ Correct Answer Explanation

Given: Power = 100 kW = 100000 W Primary voltage = 1000 V Ns/Np = 10 Secondary voltage: Vs = 10 × 1000 = 10000 V Current in transmission line: Is = P / Vs = 100000 / 10000 = 10 A Hence Option B is correct.

❓ Why Other Options Are Incorrect

�� Option A → Corresponds to the original current before stepping up.
�� Option C → Violates power conservation.
�� Option D → Unrealistically high.

🎯 Strategy

Used

Substitution

Application:

Calculate stepped-up voltage first and then use P = VI.

Final Logic:

Higher transmission voltage results in lower current.

🧠 Memory Trick

10× Voltage → 1/10 Current

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: High Voltage Power Transmission

20 Electrical grid sequence statements
1. Voltage is stepped up immediately after generation.
2. Transmission occurs over long distances at high voltage.
3. Voltage is stepped down at distributing sub-stations and utility poles.
4. Home power supply is typically around 2400 V.

A 1, 3, 4

B 1, 2, 3

C 2, 3, 4

D 1, 2, 4

💡 Short Explanation

�� Voltage is stepped up after generation. �� High-voltage transmission reduces losses. �� Voltage is reduced before reaching consumers.

✅ Correct Answer Explanation

Statement 1 is correct because generators are followed by step-up transformers. Statement 2 is correct because long-distance transmission is carried out at high voltage. Statement 3 is correct because substations and distribution transformers reduce voltage before supply to homes. Statement 4 is incorrect because household supply is typically about 230–240 V, not 2400 V. Therefore statements 1, 2, and 3 are correct.

❓ Why Other Options Are Incorrect

�� Option A → Includes Statement 4.
�� Option C → Includes Statement 4.
�� Option D → Includes Statement 4.

🎯 Strategy

Used

Elimination

Application:

Reject all options containing the incorrect Statement 4.

Final Logic:

Domestic supply is around 230–240 V, making Statement 4 false.

🧠 Memory Trick

Generate → Step-Up → Transmit → Step-Down

📚 Class XII – Physics Part I – Chapter: Alternating Current – Topic: Electrical Power Transmission and Distribution

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