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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1. Velocity of sound is greatest in ______?

میں آواز کی رفتار سب سے بڑی ہے؟ ______

Check answer and explanation

Answer: Steel

Explanation The velocity of sound is highest in solids , followed by liquids and then gases . Because sound travels faster in denser and more elastic materials. Steel , being a solid with high elasticity. It allows sound to travel faster compared to water, air, or glass .

2. What is the work function of the metal if the light of wavelength 4000λ generates photo electrons of velocity 6 × 10^5 ms^-1 from it?

Check answer and explanation

Answer: 2.1 eV

Explanation To find the work function, we need to calculate the energy of the photon (E) and the kinetic energy of the electron (KE), then use the equation: φ = E - KE E = hc / λ = 1240 eV nm / 4000 nm = 3.1 eV KE = (1/2)mv^2 ≈ (1/2) × 9.11 × 10^-31 kg × (6 × 10^5 m/s)^2 ≈ 1.64 × 10^-19 J ≈ 1.024 eV φ = 3.1 eV - 1.024 eV ≈ 2.076 eV ≈ 2.1 eV

3. The atomic diameter of a BCC crystal (if a is lattice parameter) is _____?

Check answer and explanation

Answer: a/(4/√3)

Explanation In a Body-Centered Cubic (BCC) lattice, the relation between the lattice parameter a and atomic radius r is: 4 r = 3 a Since atomic diameter = 2r , solving gives: Atomic Diameter = 4 r 2 = a 4 / 3 ​

4. Darfur conflict is in ______?

دارفور تنازعہ ______ میں ہے؟

Check answer and explanation

Answer: Sudan

Explanation The Darfur conflict is an ongoing war in the Darfur region of Sudan , starting in 2003 . It involves government forces, rebel groups, and militias , leading to severe humanitarian crises.

5. Wheatstone bridge is ______?

وہٹ اسٹون برج ______ ہے؟

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Answer: Circuit

Explanation A Wheatstone bridge is an electrical circuit used to measure unknown resistance by balancing two legs of a bridge circuit . It operates on the principle of null deflection. It is widely used in precise resistance measurements.

6. The professor told her student about the project months in advance so that they would have_____time to complete their work.

پروفیسر نے اپنے طالب علم کو پروجیکٹ کے بارے میں مہینوں پہلے بتا دیا تاکہ ان کے پاس اپنا کام مکمل کرنے کے لیے _____ وقت ہو۔

Check answer and explanation

Answer: Ample

Explanation The professor told her students about the project months in advance so that they would have " ample " time to complete their work.

7. Einstein’s photoelectric equation is?

آئن سٹائن کی فوٹو الیکٹرک مساوات ہے؟

Check answer and explanation

Answer: hv = hvo + (1/2 mv^2) max

Explanation Einstein’s photoelectric equation is "hv = hvo + (1/2 mv^2) max", where: hv is the energy of the incident photon h is Planck's constant vo is the threshold frequency m is the mass of the emitted photoelectron max is the maximum kinetic energy of the emitted photoelectron.

8. The classical expression for the mean energy of a one-dimensional oscillators is?

ایک جہتی آسکیلیٹرز کی اوسط توانائی کے لئے کلاسیکی اظہار ہے؟

Check answer and explanation

Answer: (KBT/2 + KBT/2)

Explanation The classical expression for the mean energy of a one-dimensional oscillator is: (1/2 KBT) + (1/2 KBT) = KBT

9. The value of molar specific heat according to classical theory is _____?

کلاسیکی تھیوری کے مطابق داڑھ کی مخصوص حرارت کی قدر _____ ہے؟

Check answer and explanation

Answer: 3R

Explanation According to the classical equipartition theorem , the molar specific heat at constant volume (Cv) : for a monatomic gas is (3/2)R for a diatomic gas is (5/2)R for a solid is 3R (Dulong-Petit law). The molar specific heat at constant pressure (Cp) for a solid is approximately 3R .

10. The distance between the adjacent atomic planes in CaCO3 is 0.3nm. The smallest Bragg scattering for 0.03nm X-ray is?

Check answer and explanation

Answer: 2.9°

Explanation To find the smallest Bragg scattering angle, we can use Bragg's law: 2d sin(θ) = nλ where d is the distance between the atomic planes, θ is the scattering angle, n is an integer (which is 1 for the smallest angle), and λ is the wavelength of the X-ray. Given: d = 0.3 nm λ = 0.03 nm Rearranging Bragg's law to solve for θ, we get: sin(θ) = λ / (2d) = 0.03 nm / (2 × 0.3 nm) = 0.05 θ = arcsin(0.05) ≈ 2.9°

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