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Class 10 Physics Chapter 7: Chapter 7 MCQs With Explanations
Practice Class 10 Physics Chapter 7: Chapter 7 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.
Two NAND gates can be configured such that the first performs NAND and the second inverts its output, effectively creating an AND gate.
Q2. The output of a two-input NOR gate is1 when
A NOR gate outputs 1 only when both inputs are 0; it is the inverse of an OR gate.
Q3. If X=A.B then X is 1 when
The AND operation (A · B) yields 1 only when both inputs A and B are 1.
Q4. The output of a NAND gate is 0 when
A NAND gate outputs 0 only when both inputs are 1; otherwise, it outputs 1.
Q5. Which logic gate is most suitable for triggering a house safety alarm when any sensor (door, window, motion) is activated?
An OR gate outputs a high signal if any input is high, making it ideal for alarms triggered by any one of multiple sensors being activated.
Q6. The tables which gives the values of input and output basic types of logical gates is called as:
Truth tables systematically list all possible input combinations and their corresponding outputs for logic gates.
Q7. The process by which electrons are emitted by a hot metal surface is known as
Thermionic emission is the release of electrons from a heated metal surface due to thermal energy overcoming the work function.
Q8. The particles emitted from a hot cathode surface are :
Thermionic emission from a heated cathode releases electrons due to thermal energy overcoming the work function.
Q9. For NOT operation when switch is open then lamp is
When the switch is open in a NOT gate setup, current flows through the lamp, turning it on.
Q10. For NOT operation when switch is closed then lamp is
In a NOT gate using a switch, closing the switch shorts the circuit, bypassing the lamp and turning it off.
Q11. In an OR gate circuit, if any one of the switches is open (off), what is the state of the lamp?
An OR gate outputs HIGH (lamp ON) only if at least one input is HIGH; if any switch is open (LOW), and the other is also open, output is LOW (lamp OFF).
Q12. For OR operation when all switches are closed then the lamp is
In an OR gate, if any input is high (switch closed), the output is high, so the lamp turns ON.
Q13. For OR operation when all switches are open then the lamp is
In an OR gate, the lamp turns on if any switch is closed; if all are open, no path exists and lamp remains off.
Q14. For AND operation when any one of the switch is open then lamp is :
In an AND gate, all inputs must be closed for output; if any switch is open, the circuit is incomplete and lamp is off.
Q15. For AND operation when all switches are open then lamp is
With all switches open in an AND configuration, the circuit is broken and no current flows, so the lamp remains off.
Q16. For AND operation when all switches are closed then lamp is :
In an AND gate, the output is ON only when all inputs are closed (high), so the lamp lights up when all switches are closed.
Q17. For OR operation switches are connected in
In an OR gate implementation, switches in parallel allow current to flow if any one is closed.
Q18. X=A+B shows ___________ operation .
In Boolean algebra, the '+' symbol represents the OR operation between two inputs A and B.
Q19. X=A.B shows __________ operation .
The dot (.) symbol in Boolean algebra represents the AND operation between variables A and B.
Q20. For AND operation switches are connected in
In an AND gate implementation with switches, all must be closed (ON) to complete the circuit, which requires series connection.
Q21. Boolean variables can have only ________ values
Boolean variables are binary, taking only two possible values: true (1) or false (0).
Q22. The binary digits 0 and 1 are also called:
0 and 1 are referred to as logic states in digital electronics, and they represent binary values used in logic operations; 'logic variables' typically refer to symbols like A, B, X that hold these states.
Q23. A switches has only _________states
A switch has two states: ON (closed) and OFF (open), representing binary logic levels.
Q24. The device which is used to convert digital signal to analogue signal one is :
DAC (Digital-to-Analog Converter) transforms discrete digital inputs into continuous analog output signals.
Q25. The device which is used to convert digital to analogue one is:
DAC stands for Digital-to-Analogue Converter, which transforms digital signals into analogue outputs.
Q26. Digital signal have only ____________values
Digital signals represent data as discrete values, typically binary (0 and 1), not continuous ranges.
Q27. A continuously varying signals is called as
Analogue signals vary continuously over time, representing physical quantities like voltage or sound waves without discretization.
Q28. In which form data is provided in digital system ?
Digital systems fundamentally use binary (base-2) representation for all data processing and storage.
Q29. The branch of electronics which deals with digital quantities is called _________ electronics .
Digital electronics processes discrete signals represented as binary digits (0s and 1s).
Q30. Digital quantities are expressed in the form of:
Digital quantities are represented using discrete digits (0,1) that form numerical values, so 'all of these' is accurate.
Q31. Digital quantities are those values vary in ___________ manner :
Digital quantities change in discrete, non-continuous steps, typically between defined levels like 0 and 1.
Q32. Amplifier is an analogue circuit which amplifies the signal without changing its :
An amplifier increases the amplitude of a signal without altering its waveform shape in linear operation.
Q33. The branch of electronics consisting of circuits which process _________ quantities is called Analogue electronics .
Analog electronics processes continuous analog signals, distinguishing it from digital electronics that handle discrete values.
Q34. C.R.O is primarily used as :
C.R.O is designed to display voltage waveforms over time; while voltage can be inferred, it is not a direct measuring instrument like a voltmeter, and heartbeats require ECG sensors.
Q35. The screen of C.R.O consist of a thin layer of
Phosphor coating on the C.R.O screen emits light when struck by electrons, creating visible traces of the signal.
Q36. The electrode in an electron gun that emits electrons is called as :
The electron source (typically the heated cathode) emits electrons; the grid controls beam intensity but is not the source.
Q37. The C.R.O electron gun is used for production of
The electron gun in a CRO emits a focused beam of fast-moving electrons to strike the phosphor screen.
Q38. Which component is a key part of a cathode ray oscilloscope?
The electron gun generates and focuses the electron beam essential for displaying waveforms on the CRT screen.
Q39. C.R.O consist of
A CRO consists of an electron gun to emit electrons, deflecting plates to steer the beam, and a fluorescent screen to display the waveform.
Q40. The instrument which is used to display the magnitude of changing electric current or potential is called as :
C.R.O (Cathode Ray Oscilloscope) visually displays time-varying voltage signals, making it ideal for observing changing electric potentials.
Q41. In thermionic emission the high positive potential is supplied to :
The anode is held at a high positive potential to attract and accelerate electrons emitted from the heated cathode.
Q42. Which one supply is used to heat tungsten filament in thermionic emission :
A low voltage of around 6V is typically used to heat the tungsten filament in thermionic emission devices to release electrons without damaging it.
Q43. ___________ is used to investigate the properties of electron beam .
An electron gun generates and accelerates a focused beam of electrons, making it essential for studying electron beam properties in devices like CRTs.
Q44. Thermionic emission can also be produced by electrically heating :
Thermionic emission occurs when electrons are emitted from a heated material, commonly a tungsten filament due to its high melting point and electron emission properties.
Q45. Cathode rays are discovered by :
J.J. Thomson identified cathode rays as negatively charged particles (electrons) in 1897, earning him the Nobel Prize.
Q46. Cathode rays are also called as:
Cathode rays consist of streams of electrons emitted from the cathode in a vacuum tube.
Q47. Cathode rays were discovered in :
J.J. Thomson identified cathode rays as electrons in 1897 through experiments with discharge tubes.
Q48. The charge carried by cathode rays are
Cathode rays are streams of electrons, which carry a negative electric charge.
Q49. Electronics is the branch of science which deals with the behavior of ___________using different devices for various purposes.
Electronics focuses on the control and flow of electrons through semiconductor and vacuum devices to perform functions like amplification and switching.
After Chapter 7: Chapter 7, 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 7
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 7: 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 7 after the quiz
List the questions you missed from Chapter 7 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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