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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All: questions and answer review

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121. The Synonym of Baffle is?

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Answer: Confuse

Explanation Baffle means الجھاؤ Confuse means الجھاؤ

122. The headquarters of International Court of Justice (ICJ) is located in _____?

بین الاقوامی عدالت انصاف کا صدر دفتر ______ میں واقع ہے؟

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Answer: Hague

Explanation The headquarters of the International Court of Justice is in The Hague, Netherlands . ICJ is one of the six principal organs of the United Nations. It consists of 15 judges , elected for 9-year terms . Additional information : Founded: 1945 Official Languages: English, French Member States: UN member countries Main Function: Settling legal disputes between states Last verified on 15-01-2026

123. When a proton and anti-proton annihilate, the energy release is ______?

جب ایک پروٹون اور اینٹی پروٹون فنا ہوجاتا ہے تو ، توانائی کی رہائی ______ ہوتی ہے؟

Check answer and explanation

Answer: 3x10⁻¹⁰ J

Explanation When a proton and anti-proton annihilate, the energy release is equal to the sum of their rest mass energies. The rest mass energy of a proton (or anti-proton) is approximately: E = mc² = (1.67 × 10⁻²⁷ kg) × (3 × 10⁸ m/s)² ≈ 1.5 × 10⁻¹⁰ J Since both the proton and anti-proton annihilate, the total energy release is: E_total = 2 × 1.5 × 10⁻¹⁰ J ≈ 3 × 10⁻¹⁰ J

124. If the earth stopped rotating, the weight of objects at either pole would ______?

اگر زمین گھومنے سے رک جاتی ہے تو ، کسی بھی قطب پر اشیاء کا وزن ______ ہوگا؟

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Answer: Be greater

Explanation When Earth rotates , there is a centrifugal force that slightly reduces the effective gravitational force, especially at the equator. If the Earth stopped rotating , this centrifugal effect would disappear . It causing the weight of objects to increase , particularly at the poles where the effect of rotation is minimal.

125. A submarine has circular windows of diameter 0.30m. The windows can experience a maximum external pressure of 660 kPa before they crack. What is the minimum external force needed to crack the windows?

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Answer: 47000

Explanation To find the minimum external force needed to crack the windows, we can use the formula: Force (F) = Pressure (P) × Area (A) Given: P = 660 kPa = 660,000 Pa (converting kPa to Pa) Diameter (d) = 0.30 m Radius (r) = d/2 = 0.15 m Area (A) = πr² = π(0.15)² ≈ 0.0707 m² Now, calculate the force: F = P × A ≈ 660,000 Pa × 0.0707 m² ≈ 46,662 N ≈ 47,000 N

126. A stone is projected vertically upwards from the ground at an initial speed of 15 m/s air resistance is negligible. What is the maximum height reached by the stone?

پندرہ میٹر/سیکنڈ ہوا کے خلاف مزاحمت کی ابتدائی رفتار سے زمین سے عمودی طور پر اوپر کی طرف ایک پتھر کا تخمینہ نہ ہونے کے برابر ہے۔ پتھر سے زیادہ سے زیادہ اونچائی کتنی ہے؟

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Answer: 11 m

Explanation To find the maximum height, we can use the equation: v² = u² + 2as where: v = final velocity (0 m/s, since it momentarily stops at the maximum height) u = initial velocity (15 m/s) a = acceleration due to gravity (-9.8 m/s²) s = displacement (height) Rearranging the equation to solve for s: s = u² / (2 × 9.8) s = (15)² / (2 × 9.8) s = 225 / 19.6 s ≈ 11.48 m

127. The Prime Minister "declassified" the government document. What does this imply?

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Answer: Released

Explanation Declassified means making information public by removing its confidential status. The government document was released for public access or transparency.

128. An electric field exerts a torque on a dipole only if?

برقی میدان صرف ایک ڈوپول پر ٹارک لگاتا ہے؟

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Answer: The field is perpendicular to the dipole moment

Explanation An electric field exerts a torque on a dipole only if " the field is perpendicular to the dipole moment ."

129. Uranium-238 forms Thorium-234 after radioactive decay and has a half-life of 4.5 × 10^9 years. How many years will it take to decay 75% of the initial amount?

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Answer: 9 × 10^9 years

Explanation To find the time it takes to decay 75% of the initial amount, we need to find the time it takes for 25% of the initial amount to remain. Since the half-life is 4.5 × 10^9 years, after one half-life, 50% of the initial amount remains. After two half-lives, 25% of the initial amount remains (50% of 50%). Therefore, the time it takes to decay 75% of the initial amount is: 2 × half-life = 2 × 4.5 × 10^9 years = 9 × 10^9 years

130. Ferromagnetic materials are obtained from _____?

فیرومیگنیٹک مواد _____ سے حاصل کیا جاتا ہے؟

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Answer: Nickel

Explanation Ferromagnetic materials exhibit strong magnetism due to the alignment of magnetic domains. Nickel (Ni) is a ferromagnetic material, along with iron (Fe) and cobalt (Co) , whereas aluminum and copper are non-magnetic .

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