All MCQs - Lecturer Physics Past Papers and Syllabus Practice | PakExamPoint

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All MCQs and revision practice

Study All through multiple-choice questions in Lecturer Physics Past Papers and Syllabus. This subtopic contains 342 practice questions. Read the wording carefully, compare the options and attempt an answer before checking the solution in learning mode.

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81. Lenz' Law can explain _____?

لینز کا قانون _____ کی وضاحت کرسکتا ہے؟

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Answer: Diamagnetism only

Explanation Lenz’s Law states that the induced current opposes the change that produces it . When a magnetic field is applied, induced currents in atoms oppose the applied field . This opposing effect explains the behavior of diamagnetic materials . Paramagnetism and ferromagnetism are explained mainly by electron spin and magnetic domains , not Lenz’s law. Therefore, Lenz’s Law helps explain diamagnetism only . Last updated 13-March-2026

82. When N-type semiconductor is heated?

جب این قسم کے سیمی کنڈکٹر کو گرم کیا جاتا ہے؟

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Answer: Number of electron and holes increases equally

Explanation Due to heating, when a free electron is produced than simultaneously a hole is also produced.

83. How many fission take place per second in a 300 MW reactor, assuming each fission releases 200 MeV of energy?

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Answer: 9.38 x 10^18

Explanation The number of fissions taking place per second in a 300 MW reactor is approximately 9.38 x 10^18.

84. Solar radiation emitted by sun resembles that emitted by a black body at a temperature of 6000K. Maximum intensity is emitted at a wavelength of about 4800A°. If the sun was cooled down from 6000 K to 3000 K then the peak intensity would occur at a wavelength of ______?

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Answer: 9600A˚

Explanation Using Wien's displacement law: λ_peak ∝ 1/T Given: Initial temperature (T1) = 6000 K, Initial peak wavelength (λ1) = 4800 Å Final temperature (T2) = 3000 K λ2 / λ1 = T1 / T2 λ2 = λ1 * T1 / T2 = 4800 Å * 6000 K / 3000 K = 9600 Å

85. Which is the largest Tribal Agency of FATA in terms of area?

رقبے کے لحاظ سے فاٹا کی سب سے بڑی قبائلی ایجنسی کون سی ہے؟

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Answer: South Waziristan

Explanation South Waziristan is the largest agency. It was merged into KP in 2018. It is located in the former FATA. It borders Afghanistan . South Waziristan District is a district in Dera Ismail Khan. QUESTION UPDATED 14 Januray 2026

86. For an electromagnetic wave the direction of the vector EXB gives _____?

برقی مقناطیسی لہر کے لئے ویکٹر ایکس بی کی سمت _____ دیتا ہے؟

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Answer: The direction of the wave propagation

Explanation In an electromagnetic wave , the electric field (E) and magnetic field (B) are perpendicular to each other , and their cross product ( E × B ) gives the direction of wave propagation. This follows from Maxwell’s equations , which describe the movement of EM waves in space.

87. A body in a room cools from 90°C to 80°C in 5 minutes. The time taken to cool from 70°C to 60°C is?

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Answer: More than 5 minute

Explanation The rate of cooling of a body is typically faster at higher temperatures and slows down as the temperature difference between the body and its surroundings decreases. This behavior is governed by Newton's law of cooling. Given that the body cools from 90°C to 80°C in 5 minutes, we can infer that the rate of cooling will be slower when the temperature difference is smaller, such as when cooling from 70°C to 60°C.

88. Which of the following has the longest wavelength?

مندرجہ ذیل میں سے کون سی لمبی طول موج ہے؟

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Answer: Radio waves

Explanation Radio waves have the longest wavelength and the lowest frequency in the electromagnetic spectrum. They range from millimeters to kilometers in wavelength.

89. Which of the following is the correct relation between current density and magnetization?

موجودہ کثافت اور میگنیٹائزیشن کے مابین مندرجہ ذیل میں سے کون سا صحیح تعلق ہے؟

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Answer: J = Curl(M)

Explanation The correct relation between current density ( J mathbf{J} ) and magnetization ( M mathbf{M} ) is: J = ∇ × M This equation describes how the curl of magnetization produces bound current density in magnetized materials.

90. In a photoelectric cell, the velocity of ejection of an electron emitted depends upon _______?

فوٹو الیکٹرک سیل میں ، خارج ہونے والے الیکٹران کو خارج کرنے کی رفتار _______ پر منحصر ہے؟

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Answer: Frequency of the incident light

Explanation The kinetic energy of ejected electrons depends on the frequency of the incident light, as per Einstein’s photoelectric equation : K E = h f − ϕ KE = hf - phi where h h is Planck’s constant, f f is frequency, and ϕ phi is the work function. Intensity affects the number of emitted electrons but not their velocity.

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