PHYSICS TEST 9

 

 
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#1. One electrostatic unit (esu) of charge is equivalent to

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#2. The value of solar constant in SI system is

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#3. The correct statement about Poisson’s ratio is

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#4. The SI unit of gravitational potential is

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#5. One watt-hour is equivalent to

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#6. The frequency of a human male’s voice as compared to that of a female is

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#7. The dimensions of intensity of energy are

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#8. Time of flight of projectile is

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#9. Area between the velocity time graph and time axis is equal to

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#10. When the magnitude of the drag force becomes equal to the weight, then net force acting on the droplet is

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#11. The drag force increases as the speed of the object

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#12. The force of friction that comes into action after the motion has started is called

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#13. A body of mass m is falling downward in a viscous medium with terminal velocity v, net force on the body is

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#14. Bragg’s equation will be given by

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#15. We can achieve polarization by

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#16. In single slit diffraction the condition for second minimum is

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#17. Which Phenomenon proves that nature of light is transverse

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#18. If a light of ? = 588nm falls on half silvered glass plate in Michelson’s interferometer. If movable mirror is moved through 0.233mm, the number of fringes will be observed to shift

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#19. Which one of the following is not a unit of length?

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#20. The value of g is affected by earth’s

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#21. Different radioactive materials have

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#22. The dimensional formula for amplitude of SHM is

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#23. If a spring of force constant k is cut into two equal parts, which are then joined parallel to each other. The force constant of the combination will be

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#24. Those solids which breaks soon after crossing the elastic limit are called

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#25. Which of the following has no dimension?

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#26. Hook’s law holds within

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#27. The rms velocity of air at NTP will be ______ if density of air is 1.29 kg/m^3.

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#28. The temperature, pressure and volume of two gases X and Y are T, P and V respectively. When the gases are mixed then the volume and temperature of the mixture becomes V and T respectively. The pressure and mass of the mixture will be

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#29. The first excited state of hydrogen atom is higher to its ground energy level by 10.2 EV. The temperature necessary to excite hydrogen atom to first excited state will be

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#30. The correct relation connecting the universal gas constant (R), Avogadro number N_A and Boltzmann constant (K) is

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#31. The rms velocities of molecules of two gases of equal volume are 2 ms^-1 and 3 ms^-1 respectively. The ratio of their pressure will be

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#32. Truth table of logic function

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#33. The common emitter current amplification factor Ξ² is given by

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#34. In a half-wave rectifier the diode conducts during

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#35. When temperature of a conductor increases the resistance

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#36. Resistance is independent of

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#37. Resistance of a conductor increases with the rise of temperature of the conductor, This is due to

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#38. Law of electromagnetic induction have been used in the construction of a

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PHYSICS INITIAL TEST 9

Welcome to Physics Initial Test 9, an advanced online practice module designed specifically for candidates preparing for the initial academic tests of the Pakistan Armed Forcesβ€”including Pakistan Air Force (PAF) (GDP, CAE, Aeronautical Engineering, Airmen), Pak Army (Technical Cadet Course – TCC), and Pak Navy (PN Cadet, Operations, Engineering Branches). This practice quiz focuses on nuclear mass defect, binding energy calculations, particle decay series, radiation detectors, and high-frequency multiple-choice questions needed to clear your computer-based military entrance exam with distinction.

Key Topics Covered in Physics Initial Test 9

To secure top marks in the Physics academic paper during your Armed Forces selection test, make sure to thoroughly revise these core physical concepts assessed in this module:

  • Nuclear Mass Defect & Binding Energy: Mass-energy equivalence, binding energy per nucleon curve, stability of atomic nuclei, and energy release in nuclear reactions.
  • Radioactive Decay Series & Isotopes: Alpha, beta, and gamma emission rules, decay constant ($\lambda$), half-life relationships, and radioactive equilibrium.
  • Nuclear Reactors & Fission Control: Moderators, control rods, coolants, critical mass requirements, and breeder reactor mechanics.
  • Radiation Measurement & Detection: Geiger-Muller (GM) counters, solid-state detectors, cloud chambers, and scintillation counters.

High-Frequency Sample MCQs for Practice

Test your understanding with these representative Physics MCQs frequently asked in tri-services academic tests:

1. The difference between the mass of an intact nucleus and the sum of the masses of its constituent nucleons is known as:

A) Mass number

B) Atomic mass unit

C) Mass defect

D) Critical mass

Answer: C) Mass defect

2. One atomic mass unit ($1\text{ u}$) is equivalent to an energy of approximately:

A) $931.5\text{ MeV}$

B) $0.51\text{ MeV}$

C) $1.02\text{ MeV}$

D) $13.6\text{ eV}$

Answer: A) $931.5\text{ MeV}$

3. Which element possesses the highest binding energy per nucleon, making its nucleus exceptionally stable?

A) Uranium-235

B) Iron-56

C) Helium-4

D) Hydrogen-1

Answer: B) Iron-56

4. In a commercial nuclear reactor, heavy water or graphite is primarily used as a:

A) Coolant

B) Control rod

C) Moderator

D) Shielding material

Answer: C) Moderator

5. During a positive beta ($\beta^+$) decay, the nucleus emits a positron along with a:

A) Neutrino

B) Antineutrino

C) Gamma photon

D) Proton

Answer: A) Neutrino

6. Cadmium or boron rods are used in nuclear reactors to fulfill which function?

A) Slow down fast neutrons

B) Absorb excess neutrons to control the chain reaction

C) Transfer thermal heat to steam turbines

D) Prevent radioactive leakage

Answer: B) Absorb excess neutrons to control the chain reaction

7. The dead time of a standard Geiger-Muller (GM) tube counter is approximately in the range of:

A) A few microseconds

B) A few hundred microseconds

C) Several seconds

D) Zero

Answer: B) A few hundred microseconds

Detailed Overview of Physics Initial Test 9 Preparation

Preparing for Physics Initial Test 9 requires a deep understanding of nuclear binding energies, decay mathematics, and reactor physics. In military selection centers, the computer-based Physics exam evaluates both conceptual clarity and rapid numerical application under tight deadlines. Regular practice with structured practice modules sharpens your calculation speed, improves formula recall, and guarantees peak test-day performance.

Effective Revision Tips for Test 9

  1. Master Mass-Energy Equivalents: Remember that $1\text{ u} = 931.5\text{ MeV}$ to quickly calculate mass defect energies without performing long arithmetic.
  2. Understand Reactor Components: Memorize the functional difference between moderators (slow down neutrons) and control rods (absorb neutrons).
  3. Practice Timed Quizzes: Solve practice questions rapidly to build optimal time management skills under real testing conditions.

Useful Resources & Next Steps

Physics Academic Test Preparation: Electromagnetism & Induction

Magnetic Forces, Ampere’s Law, Faraday’s Law & Lenz’s Law

Electromagnetism links electricity and magnetism, revealing how moving charges create magnetic fields and how changing magnetic fluxes induce electromotive force (EMF). Initial military entrance exams test candidate proficiency in magnetic force on moving charges (Lorentz force), Ampere’s law, Faraday’s law of induction, Lenz’s law, and self/mutual induction. Mastering these concepts ensures you tackle magnetic induction problems with confidence.

Key Principle:

Lenz’s Law is a direct consequence of the law of conservation of energy; the induced current always flows in such a direction as to oppose the very cause producing it.

Major Topics Covered in Physics Quiz 9

  • Magnetic Force on Moving Charges: Lorentz force equation ($F = q(E + v \times B)$) and circular motion of charged particles in uniform magnetic fields.
  • Magnetic Field of Currents: Biot-Savart Law and Ampere’s Circuital Law applied to long straight wires, solenoids, and toroids.
  • Faraday’s Law of Electromagnetic Induction: Induced EMF magnitude ($E = -N \frac{\Delta \Phi_B}{\Delta t}$) and flux linkage calculations.
  • Inductance: Self-inductance ($L$) and mutual inductance ($M$), energy stored in magnetic fields of inductors ($U = \frac{1}{2}LI^2$).

Electromagnetic Equations

  • Magnetic Force: $F = qvB\sin\theta$
  • Radius in Magnetic Field: $r = \frac{mv}{qB}$
  • Inductor Stored Energy: $U = \frac{1}{2}LI^2$

Proceed to Physics Quiz 9 below to test your knowledge on magnetic forces and electromagnetic induction laws.

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