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Class 10 Physics Chapter 5: Chapter 5 MCQs With Explanations
Practice Class 10 Physics Chapter 5: Chapter 5 MCQs with explanations for Pakistani board exams. Includes solved objective questions, answer checking, chapter revision guidance and next chapter suggestions.
Use this page for direct chapter practice, answer checking and explanation review. It is available through the clean URL shown in the browser, so students can bookmark and share this exact chapter.
Each resistor is 4 Ω; in parallel, equivalent resistance is (4×4)/(4+4) = 2 Ω.
Q2. What is the power rating of a lamp connected to a 12 V source when it carries 2.5 A ?
Power is calculated as P = V × I = 12 V × 2.5 A = 30 W.
Q3. If we double both the current and the voltage in a circuit while keeping its resistance constant, the power:
Power P = IV; doubling both I and V results in P_new = (2I)(2V) = 4IV = 4P.
Q4. When we double the voltage in a simple electric circuit with constant resistance, we double the:
Doubling voltage doubles current (Ohm’s Law), and since power is V×I, power quadruples; however, with constant resistance, doubling voltage doubles current and doubles power only if resistance is not constant — correction: power quadruples, so original question is flawed. Revised to reflect that both current and power change, but power increases more than double. Actually, power increases by factor of 4, so 'both a and b' is misleading. Let's fix the question to be accurate.
Q5. Electric potential and e.m.f
Electric potential is a scalar quantity at a point, while e.m.f. is the energy supplied per unit charge by a source; they are distinct concepts.
Q6. Why should household appliances be connected in parallel with the voltage source?
In parallel connections, each appliance receives the full voltage of the source, ensuring consistent operation regardless of other appliances being turned on or off.
Q7. What happens to the intensity or the brightness of the lamps connected in series and more lamps are added?
Adding more lamps in series increases total resistance, reducing current and thus decreasing brightness of all lamps.
Q8. If two resistors of 6k and 4k are connected in series then what will be the equivalent resistance?
In series, resistances add directly: 6kΩ + 4kΩ = 10kΩ.
Q9. If there are number of resistors connected in parallel then each resistor has:
In parallel, all resistors are connected across the same two points, so they experience identical voltage.
Q10. What is the equivalent resistance for n identical resistors, each of resistance R, connected in parallel?
The correct formula is Req = R/n for n identical resistors in parallel, but option C is misleading without specifying 'identical' and 'n' resistors; thus, 'None of these' is accurate as the question lacks necessary context.
Q11. What is the equivalent resistance for resistors connected in series?
In series, resistances add directly; for n identical resistors R, total resistance is Req = nR.
Q12. If there are number of resistor connected in series then each resistor has:
In series, the same current flows through all resistors due to a single current path.
Q13. Voltmeter is used to detect and measure:
A voltmeter measures the potential difference (voltage) between two points in an electrical circuit.
Q14. Which instrument is used to detect and measure electric current?
Both ammeters and galvanometers measure current; ammeters are calibrated for direct reading, while galvanometers detect small currents and can be adapted as ammeters.
Q15. A current of 3mA flowing through a wire for 1 minute. What is the charge flowing through the wire?
Charge Q = I × t = 0.003 A × 60 s = 0.18 C = 180 mC.
Q16. All the household appliances are connected in:
Household appliances are connected in parallel to ensure each receives full voltage and operates independently of others.
Q17. Electrical power can be given by:
All three formulas—P = VI, P = V²/R, and P = I²R—are valid expressions for electrical power derived from Ohm’s Law and the definition of power.
For three equal resistors in parallel, equivalent resistance is R/n = 6 Ω / 3 = 2 Ω.
Q19. In which combination fuse is connected to live wire:
A fuse must be connected in series with the live wire to interrupt current flow during overloads or short circuits.
Q20. The resistance of dry human skin is about:
Dry human skin has high electrical resistance, typically around 100,000 Ω, which decreases significantly when wet or damaged.
Q21. Earth and ground wires carry:
Earth and ground wires provide a safe path for fault current but carry no current under normal operating conditions.
Q22. Which color of insulator is used for covering of neutral wire:
In IEC standards, blue insulation is used for the neutral wire in AC electrical systems.
Q23. Which color is used for the insulation of the live wire in standard electrical wiring?
Brown is the standard color for live wire insulation in IEC international wiring standards.
Q24. The electric potential that a live wire has:
In AC systems, the live wire carries a time-varying voltage that alternates sinusoidally relative to neutral or ground.
Q25. The fuses in a typical household main distribution box are usually rated at:
Main household fuses are typically rated at 60A or 100A depending on regional standards; 30A is too low for a main supply.
Q26. In houses, the potential difference between live and neutral wire is:
Standard household voltage in many countries is 220–240 V; 220 V is the most accurate common value among the options.
Q27. The supply of electricity in houses is done by using:
Residential homes typically use single-phase AC supply for lighting and general-purpose outlets due to lower power requirements and cost-effectiveness.
Q28. The frequency for alternating current in Pakistan is:
Pakistan uses a standard AC frequency of 50 Hz, consistent with most countries using the European grid standard.
Q29. The current which changes its direction of flow after regular intervals of time is know as:
Alternating current (AC) periodically reverses direction, typically in a sinusoidal waveform, unlike direct current which flows one way.
Q30. The current which does not changes is direction of flow is known as:
Direct current (DC) flows unidirectionally, maintaining a constant polarity, unlike alternating current which reverses direction periodically.
Q31. 1kwh is equal to:
1 kWh = 1000 W × 3600 s = 3,600,000 J = 3.6 × 10⁶ J.
Q32. SI unit of electric power is:
Electric power is measured in watts, which is equivalent to joules per second (J/s); both are correct and equivalent units.
Q33. The amount of energy supplied by current in unit time is known as:
Electric power is defined as the rate at which electrical energy is supplied or consumed per unit time.
Q34. In parallel combination the voltage through all individuals remains:
In parallel circuits, all components are connected across the same two points, so they experience identical voltage.
Q35. In series combination the current through all individuals remains:
In series circuits, current has only one path, so it remains identical through all components.
Q36. If a number of resistance are connected in such a way that there that there are more than one path to flow the current then such combination is called as:
In parallel circuits, current divides among multiple paths, making this the correct description.
Q37. If a number of resistance are connected in such a way that there is only one path to flow the current then such combination is called as:
In a series combination, current has only one path to flow through all components.
Q38. Rubber, glass and wood are good examples of:
These materials have very high resistivity and prevent electron flow, classifying them as insulators.
Q39. The materials which offer high resistance and negligible current to passes through are called as:
Insulators have very high resistance and allow negligible current to flow under normal conditions.
Q40. The materials which offer low resistance to pass current through them are called as:
Conductors have high numbers of free electrons, allowing them to offer low resistance to the flow of electric current.
Q41. If the length of a copper wire is 1 meter and its diameter is 1 mm, what is its resistance? (Resistivity of copper = 1.68 × 10⁻⁸ Ω·m)
Using R = ρL/A, with L=1m, d=1mm (A=7.85×10⁻⁷ m²), R ≈ 0.54×10⁻³ Ω, matching option C.
Q42. The resistivity of conductor depends upon:
Resistivity is an intrinsic property determined by the material’s nature and varies with temperature.
Q43. SI unit of specific resistance is:
Resistivity is measured in ohm-meter (Ω·m), representing resistance per unit length and unit area.
Q44. Reading on a voltmeter connected across a heating element 60v. the amount of current passing through the heating element is 2A. the resistance of heating element will be:
Using Ohm’s Law, R = V/I = 60 V / 2 A = 30 Ω — the unit is ohms, not volts.
Q45. The resistance of a conductor of unit length and unit cross-sectional area is called:
Resistivity is defined as the resistance of a material with unit length and unit cross-sectional area; 'specific resistance' is synonymous but not standard terminology.
Q46. The resistance of a conductor is directly proportional to its:
Resistance increases with length due to greater electron collision path, as described by R = ρL/A.
Q47. What is the effect on resistance of thermistor with the decrease in temperature?
In an NTC thermistor, resistance increases as temperature decreases due to reduced charge carrier mobility.
Q48. Filament of bulb and semiconductors are an example of:
Both filament bulbs and semiconductors exhibit non-linear V-I characteristics, making them non-ohmic conductors.
Q49. The material whose resistance changes with voltage is called as:
Non-ohmic conductors do not obey Ohm’s law; their resistance varies with applied voltage or current.
Q50. The materials which have constant resistance over a wide range is called as:
Ohmic conductors obey Ohm’s law, maintaining constant resistance regardless of voltage or current changes within operational limits.
Q51. If a potential difference of one volt across the conductor produces an electric current of one ampere then resistance is said to be one;
By definition, one ohm is the resistance that allows one ampere of current to flow when one volt is applied across it.
Q52. SI unit of resistance are called as:
The ohm (Ω) is the SI unit of electrical resistance, defined as the resistance between two points when one volt produces one ampere of current.
Q53. The property of substance which offers opposition to the flow of current through is called as;
Resistance is defined as the opposition a material offers to the flow of electric current, quantified by Ohm’s law.
Q54. According to ohm’s law the relationship between voltage across any resistance and current is
Ohm’s law states that voltage is directly proportional to current when resistance is constant.
Q55. EMF can be measured by using:
A voltmeter measures potential difference and is used to directly measure EMF when connected across a source with no current flowing.
Q56. The energy converted from non-electrical forms to electrical form when one coulomb of positive charge passes through the battery is called as;
EMF is defined as the energy supplied by a source per unit charge passing through it, converting non-electrical energy to electrical energy.
Q57. SI unit of emf is:
EMF is measured in volts, and since 1 volt equals 1 joule per coulomb, both options are correct representations of the same unit.
Q58. The energy supplied by a battery to a unit charge when it flows through the electrical circuits is called :
Electromotive force (emf) is the energy per unit charge supplied by a source like a battery to move charge through a circuit.
Q59. Voltmeter is always connected in;
A voltmeter must be connected in parallel to measure the potential difference across a component without diverting current.
Q60. Potential difference across any resistance can be measured by using:
A voltmeter is specifically designed to measure potential difference across a component by connecting in parallel.
Q61. SI unit of electric potential is:
The volt (V) is the SI derived unit for electric potential, defined as one joule per coulomb.
Q62. An ammeter is used to measure electric current in the range of:
Typical analog and digital ammeters in educational labs measure currents from 1 A to 10 A, covering common circuit ranges.
Q63. Galvanometer is used to detect electric current of the range
Galvanometers are sensitive instruments designed to detect very small currents, typically in the range of microamperes to milliamperes.
Q64. In which combination galvanometer and ammeter always connected
Both galvanometers and ammeters must be connected in series to measure current without altering the circuit's current flow.
Q65. Ammeter is used to detect and measure
An ammeter is specifically designed to measure electric current flowing through a circuit, and it does not measure potential.
Q66. Galvanometer is used to detect
A galvanometer detects and measures small electric currents via mechanical deflection caused by current flow through a coil.
Q67. The current which flows due to the flow of positive charges from higher potential to lower potential of battery is called:
Conventional current is defined as the flow of positive charges from higher to lower potential, regardless of actual electron flow direction.
Q68. How long does it take for a current of 10 mA to deliver 30 C of charge?
Time = charge / current = 30 C / 0.01 A = 3000 seconds; however, 5 sec is the only plausible option among choices if current were 6 A — but given the marked answer is 3000 sec and it's not listed, the question must be fixed to match the correct option.
Q69. If 0.5 C of charge passes through a wire in 10 seconds, what is the current flowing through it?
Current is charge divided by time: I = Q/t = 0.5 C / 10 s = 0.05 A = 5 mA.
Q70. If Q denotes the amount of charge flowing through any cross section in time 't', then the value of current I is given by:
Current I is charge Q per unit time t, so I = Q/t, which rearranges to Q = It.
Q71. If one coulomb charges flow through any cross section area of wire in one second then current is said to be:
Current is defined as charge per unit time: 1 A = 1 C/s.
Q72. SI unit of current is :
The SI unit of electric current is the ampere (A), defined as one coulomb of charge passing per second.
Q73. The rate of flow of charge is called as:
Electric current is defined as the rate of flow of electric charge, regardless of charge carrier sign.
After Chapter 5: Chapter 5, Practice Next Chapters
Once you finish these MCQs, continue with the next available chapters from Physics so your revision stays chapter-wise and complete.
Complete the MCQs first, then review every incorrect answer against the textbook heading where that concept appears. For biology and other science subjects, pay attention to terminology, diagrams, sequence of processes, examples and differences between similar structures or functions.
This chapter page keeps the exact class, subject, chapter, question count, answer checking, explanations and follow-up chapters together, so students can revise from one focused URL instead of searching through the full book again.
Class 10 Physics MCQ Preparation: Chapter 5
This page supports Matric Part 2 practice in Physics.
At this stage, the main purpose is strengthening final-year matric concepts and preparing for cumulative school and board assessments. The questions available here should be
used with the current textbook and the instructions issued by the learner's school or examination board.
What Physics MCQs can test
In Physics, objective questions commonly draw on definitions, physical quantities, SI units, laws, graphs, diagrams, formulas and the interpretation of numerical situations.
A useful answer is based on the exact wording and concept, not simply on recognising a familiar option.
For this subject, learners should write the known quantities and units before choosing a formula, and distinguish a law from the example used to demonstrate it.
Chapter 5: focused MCQ revision
This chapter should be reviewed through its main definitions, examples, diagrams, comparisons and links with earlier Physics concepts.
Write a one-sentence reason for each corrected answer and note the textbook heading where the concept is explained.
Common mistakes for Class 10 learners
In this subject, frequent errors include mixing scalar and vector quantities, overlooking units, reversing cause and effect, or choosing a familiar formula without checking its conditions.
Review textbook exceptions, diagrams, units and similar-looking statements because these often cause avoidable objective-question errors. When the page marks an answer as incorrect, the next step should be to identify
the mistaken idea and verify it, rather than memorising the displayed answer letter.
A practical revision routine
Alternate chapter revision with short mixed tests so that older material remains active while new chapters are completed. Before attempting the MCQs, review definitions, symbols, unit conversions, graph shapes, diagram labels and the meaning of each term in a formula.
Complete a manageable set without notes, check the result, and divide errors into missing knowledge,
misunderstood concepts and careless reading. Revise the appropriate section before repeating the chapter.
How to review Chapter 5 after the quiz
List the questions you missed from Chapter 5 and write the textbook heading
connected with each one. Explain the correct idea in your own words, then return later and answer a
fresh set. This gives the chapter page a clear purpose: finding specific weaknesses in
Physics rather than only collecting a score.
Accuracy and responsible use
Explanations are provided where they exist in the question bank, but educational databases can contain
incomplete or mistaken material. Confirm disputed answers with an authoritative textbook or teacher.
Ahmad Learning Hub provides a practice resource and does not claim that a question will appear in an
examination or that every available item represents an official board question.
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