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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161. Which of the following is the property of an ionic compound?

آئنک کمپاؤنڈ کی جائیداد مندرجہ ذیل میں سے کون ہے؟

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Answer: High melting and boiling

Explanation Ionic compounds have strong electrostatic forces between ions, requiring high energy to break, resulting in high melting and boiling points. Examples include sodium chloride (NaCl) and potassium bromide (KBr), which have high thermal stability.

162. What is the divergence of the vector field f = 3x^2i + 5xyj + xyz^3kA at the point (1, 2, 3)?

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Answer: 65

Explanation To find the divergence, calculate: div(f) = ∂/∂x (3x^2) + ∂/∂y (5xy) + ∂/∂z (xyz^3) = 6x + 5x + 3xyz^2 At (1, 2, 3): div(f) = 6(1) + 5(1) + 3(1)(2)(3)^2 = 6 + 5 + 54 = 65

163. Divergence of a vector at a point in a vector field is _____ quantity.

ویکٹر فیلڈ میں ایک نقطہ پر ویکٹر کا انحراف _____ مقدار ہے۔

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Answer: A scalar

Explanation Divergence of a vector field measures the rate at which a vector spreads out from a point, resulting in a scalar value . It is computed as the dot product of the del operator (∇) with the vector field, producing a single numerical value at each point.

164. ‘Be under the scanner’ means _______?

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Answer: All of the Above

Explanation "Be under the scanner" means being carefully scrutinized or closely examined . It suggests being under observation or the watchful eye of someone.

165. A hollow metal sphere is charged to a potential V. The potential at its center is _____?

ایک کھوکھلی دھات کے دائرے سے کسی ممکنہ وی سے معاوضہ لیا جاتا ہے۔ اس کے مرکز میں صلاحیت _____ ہے؟

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Answer: V

Explanation Inside a hollow conducting sphere , the electric field is zero due to electrostatic shielding. Since there is no electric field inside, the potential remains constant throughout the sphere , including at the center. Therefore, the potential at the center is V , the same as the surface.

166. Image formed by a bi-convex lens is ______?

تصویری بائیو ایکس لینس کے ذریعہ تشکیل کردہ تصویر ______ ہے؟

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Answer: Real

Explanation A bi-convex lens is a converging lens , It typically forms a real image when the object is beyond the focal point. Real images are inverted . It can be projected onto a screen.

167. The Jury members _____ for almost an hour before signing the verdict.

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Answer: Deliberated

Explanation " Deliberated " means to carefully consider or discuss before making a decision. Jury members deliberate before reaching a verdict in a trial.

168. The Synonym of ‘Postulate’ is?

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Answer: Hypothesize

Explanation Postulate means نظریہ پیش کرنا، دعوی کرنا Hypothesize means نظریہ قائم کرنا

169. A particle of mass 40 g executes a simple harmonic motion of amplitude 2.0 cm. If the time period is 0.20 s, find the total mechanical energy of the system?

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Answer: 8.0 × 10^-3 J

Explanation Total mechanical energy (E) = (1/2) × m × ω^2 × A^2 ω = 2π / T = 2π / 0.20 s = 10π rad/s m = 40 g = 0.04 kg A = 2.0 cm = 0.02 m E = (1/2) × 0.04 kg × (10π rad/s)^2 × (0.02 m)^2 = 8.0 × 10^-3 J

170. What will be the time period of a simple pendulum in a freely falling lift?

آزادانہ طور پر گرتی لفٹ میں ایک سادہ لاکٹ کا وقت کیا ہوگا؟

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Answer: ∞

Explanation In a freely falling lift, both the pendulum and its support fall with the same acceleration (g), creating a weightless condition. Since there is no restoring force (no effective gravity), the pendulum does not oscillate, leading to an infinite time period.

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