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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91. In Ampere's law, the integration is over a ______?

امپیر کے قانون میں ، انضمام ______ سے زیادہ ہے؟

Check answer and explanation

Answer: Closed path

Explanation Ampere's law states that the line integral of the magnetic field around a closed path is proportional to the total current enclosed. Mathematically , ∮ B ⋅ d l = μ 0 I enc oint mathbf{B} cdot dmathbf{l} = mu_0 I_{text{enc}} ​ , where the integral is taken over a closed loop (path).

92. A hypermetropic person having near point at a distance of 0.75 m puts on spectacles of power 2.5 D. The near point now is at ____?

Check answer and explanation

Answer: 0.26 m

Explanation 1/f = 1/v - 1/u 2.5 = 1/0.75 - 1/u u = -0.26 m So, the new near point is indeed: 0.26 m

93. The ratio of the weight of a man in a stationary lift and in a lift accelerating downward with uniform acceleration ‘a’ is 3:2. The acceleration of the lift is _____?

Check answer and explanation

Answer: g/3

Explanation Let's denote the weight of the man in the stationary lift as W and the weight in the accelerating lift as W'. We know that W' / W = 2/3. When the lift is accelerating downward with acceleration 'a', the apparent weight (W') is given by: W' = W - ma where m is the mass of the man. Since W' / W = 2/3, we can write: (W - ma) / W = 2/3 Substitute W = mg (where g is the acceleration due to gravity): (mg - ma) / mg = 2/3 Simplify: g - a = (2/3)g a = g - (2/3)g a = (1/3)g a = g/3

94. What will be time period of a spring mass system. If mass m is connected with two springs k1 and k2 in parallel?

Check answer and explanation

Answer: T=2π√m/k1+k2

Explanation When two springs are connected in parallel: Effective spring constant (k) = k1 + k2 Time period (T) = 2π√(m / k) = 2π√(m / (k1 + k2))

95. Fill in the blank with appropriate word: The new findings on the virus caused panic among the scientists and management ______?

Check answer and explanation

Answer: Alike

Explanation The sentence should read : "The new findings on the virus caused panic among the scientists and management alike ." The word "alike" is used to indicate that both scientists and management shared a similar reaction (panic) to the new findings.

96. A sphere, a cube and a thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of 3000°K, which of these will cool fastest?

Check answer and explanation

Answer: Plate

Explanation The rate of cooling follows Newton’s Law of Cooling , which depends on surface area. The thin circular plate has the largest surface area-to-volume ratio. This allowing it to lose heat faster than the cube or sphere.

97. The Maxwellian speed distribution provides a direct explanation of _____?

میکس ویلین اسپیڈ ڈسٹری بیوشن _____ کی براہ راست وضاحت فراہم کرتا ہے؟

Check answer and explanation

Answer: Evaporation

Explanation The Maxwellian speed distribution describes the distribution of molecular speeds in a gas. This showing that some molecules have enough kinetic energy to escape the liquid surface. This explains evaporation , where faster-moving molecules overcome intermolecular forces and leave the liquid phase.

98. Idiom: “Rides the high horse” means?

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Answer: Superior

Explanation " Rides the high horse " means acting superior, arrogant, or self-righteous. It originates from medieval times when higher-ranking people rode taller horses to show status.

99. Minimum charge on any object cannot be less than ______?

کسی بھی شے پر کم سے کم چارج ______ سے کم نہیں ہوسکتا؟

Check answer and explanation

Answer: 1 × 10⁻¹⁹ e

Explanation The minimum possible charge on any object is the charge of a single electron or proton , which is 1.6 × 10⁻¹⁹ C . But in terms of elementary charge (e), it is written as 1 × 10⁻¹⁹ e . No object can have a charge smaller than this because charge is quantized in multiples of e .

100. Packing density is maximum for _______?

پیکنگ کثافت _______ کے لیے زیادہ سے زیادہ ہے؟

Check answer and explanation

Answer: Face centered cubic lattice

Explanation The packing density (atomic packing factor) is highest for the face-centered cubic (FCC) lattice at 74%. FCC structure has closely packed atoms compared to simple cubic (52%) and body-centered cubic (68%).

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