Welcome to Physics Initial Test 5, an advanced online practice module designed specifically for candidates preparing for the initial academic tests of the Pakistan Armed Forces—including Pakistan Air Force (PAF) (GDP, CAE, Aeronautical Engineering, Airmen), Pak Army (Technical Cadet Course – TCC), and Pak Navy (PN Cadet, Operations, Engineering Branches).
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#1. Dimension of torque is
#2. Unit of solid angle is
#3. For assessment of total uncertainty in case of division
#4. To decrease timing uncertainty
#5. Correction factor can be applied to
#6. Light year is a unit of
#7. In addition and subtraction
#8. The product of force and time of impact force is called
#9. The maximum height attained by the projectile is
#10. For a freely falling elevator
#11. For a freely falling elevator, everything in it
#12. If an elevator is moving downward with an acceleration a, the apparent weight ‘T’ of an object of real weight ‘W’ will be
#13. The base of equation of continuity is on the
#14. The speed at which light travels within the material depends upon
#15. The speed of light in vacuum or in air is
#16. Michelson used the equation to find the speed of light is
#17. The final image obtained by astronomical telescope is
#18. The magnifying power of an instrument is expressed in
#19. The displacement of particle executing simple harmonic motion at any instant t is x = 3 cos 2 π t. the acceleration produced in the particle will be
#20. A block of 4 kg produces an extension of 0.16 m in a spring. The block is replaced by a body of mass 0.5 kg. If the spring is stretched and then released the time period of motion will be
#21. The kinetic energy of a harmonic oscillator is K = K_0 cos^2 ωt. The maximum potential energy of the particle is
#22. The magnitude of the force producing an acceleration of 10 m/sec^2 in a body of mass 500 gms in Newton is
#23. The time period of the second’s hand of watch is
#24. Which of the given elements is a diamagnetic material?
#25. Yttrium barium copper oxide (YBa_2Cu_3O_7) becomes superconductor at
#26. Steel is more elastic than rubber because
#27. The efficiency of Carnot engine depend upon
#28. An engine which converts heat energy into useful work upto 35% to 40% is
#29. A device which convert heat energy into mechanical energy is called
#30. An ideal heat engine has 100% efficiency y only if its exhaust temperature is
#31. A system in which there is no transfer of mass across the boundary is called
#32. A device which convert A.C into D.C is called
#33. P-type semi conductor is electrically
#34. What is the minimum distance between an object and its real image in a convex lens?
#35. The process of obtaining D.C from A.C using diode value is called
#36. Thermocouple is an arrangement of two different metals
#37. A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be
#38. In case of a motor, if V is the applied emf and ε is the back emf then net emf in the circuit is
#39. Lenz’s law is consequence of law of conservation of
#40. When is the armature current in DC motor maximum?
#41. A surface has work function 3.3 eV. Which of the following cause emission?
#42. Find the maximum potential a Cu ball (isolated) can have when irradiated with a wavelength λ = 140 nm [ϕ_Cu = 4.47 eV]
#43. An α particle of mass 6.65 * 10^-27 kg travels at right angles to a magnetic field of 0.2T with a speed of 6 * 10^5 m/s. The acceleration of α-particles will be
#44. What voltage is needed to balance an oil drop carrying 5 electron when located the plates of a capacitor 5 mm apart? The mass of drop is 3.12 * 10^-14 kg
#45. The binding energy per nucleon is maximum in the case of
#46. A radioactive element has half-life period 1600 years. After 6400 years what amount will remain?
#47. The element used for radioactive Carbon dating for more than 5600 years
#48. Pair production can take place only with
#49. Work done by centripetal force is
#50. Identify the INCORRECT statement: A planet is observed by an astronomical telescope having objective of focal length 16 m and eye-piece of focal length 2 cm. Then
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PHYSICS INITIAL TEST 5
Welcome to Physics Initial Test 5, an advanced online practice module designed specifically for candidates preparing for the initial academic tests of the Pakistan Armed Forces—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 modern physics, photoelectric effect, atomic spectra, nuclear phenomena, and high-frequency multiple-choice questions needed to clear your computer-based military entrance exam with distinction.
Key Topics Covered in Physics Initial Test 5
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:
- Dawn of Modern Physics: Special theory of relativity principles, mass-energy equivalence ($E = mc^2$), blackbody radiation, and de Broglie wavelength.
- Quantum Phenomena & Photoelectric Effect: Photon momentum, photoelectric threshold frequency, work function, Compton effect, and pair production.
- Atomic Spectra & Quantum Mechanics: Bohr’s atomic model postulates, hydrogen energy levels, X-ray production mechanisms, and continuous vs line spectra.
- Nuclear Physics & Radioactivity: Radioactive decay laws, half-life calculations, binding energy per nucleon, nuclear fission, and nuclear fusion reactions.
High-Frequency Sample MCQs for Practice
Test your understanding with these representative Physics MCQs frequently asked in tri-services academic tests:
1. The rest mass of a photon is strictly equal to:
A) Infinity
B) $1.6 \times 10^{-19}\text{ kg}$
C) Zero
D) $9.1 \times 10^{-31}\text{ kg}$
Answer: C) Zero
2. In the photoelectric effect, the maximum kinetic energy of emitted photoelectrons depends on:
A) Intensity of incident light
B) Frequency of incident light
C) Area of the target plate
D) Distance from the source
Answer: B) Frequency of incident light
3. According to Bohr’s theory, the angular momentum of an electron in an orbit is quantized and equal to:
A) $nh / 2\pi$
B) $2\pi / nh$
C) $nh / \pi$
D) $h / 2\pi n$
Answer: A) $nh / 2\pi$
4. The minimum energy required to cause pair production is approximately:
A) $0.51\text{ MeV}$
B) $1.02\text{ MeV}$
C) $2.04\text{ MeV}$
D) $13.6\text{ eV}$
Answer: B) $1.02\text{ MeV}$
5. Which type of radiation emitted during radioactive decay possesses the highest penetrating power?
A) Alpha particles
B) Beta particles
C) Gamma rays
D) Positrons
Answer: C) Gamma rays
6. If a radioactive material has a half-life of 4 days, what fraction of the original sample remains after 12 days?
A) $1/2$
B) $1/4$
C) $1/8$
D) $1/16$
Answer: C) $1/8$
7. The energy released in the sun is primarily due to which nuclear reaction?
A) Nuclear fission
B) Nuclear fusion
C) Alpha decay
D) Chemical combustion
Answer: B) Nuclear fusion
Detailed Overview of Physics Initial Test 5 Preparation
Preparing for Physics Initial Test 5 requires a solid grasp of modern physical concepts, quantum properties, and nuclear structure. In military selection centers, the computer-based Physics paper heavily tests atomic and nuclear energy calculations alongside wave-particle duality concepts. Regular practice with structured questions helps master photon equations, radioactive decay rates, and fundamental atomic constants for maximum speed and accuracy during your test.
Effective Revision Tips for Test 5
- Master Half-Life Formulas: Practice solving exponential decay equations ($N = N_0 (1/2)^n$) where $n$ represents the number of half-lives.
- Review Photonic Relationships: Understand how photon energy ($E = hf$) relates to threshold frequency ($\Phi = hf_0$) and stopping potential ($eV_0$).
- Practice Timed Quizzes: Solve practice questions rapidly to build optimal time management skills under real testing conditions.
Useful Resources & Next Steps
- Main Hub: Access All Forces Academic Online Quizzes
- Official Websites:
Physics Academic Test Preparation: Oscillations, Waves & Sound
Simple Harmonic Motion, Wave Properties & Doppler Effect
Wave mechanics and oscillatory motion represent vital wave-theory components in intermediate physics. Initial armed forces tests regularly feature questions concerning simple harmonic motion (SHM), resonance, transverse and longitudinal wave behavior, speed of sound in various media, standing waves in pipes, and the Doppler effect. Strengthening your knowledge here ensures you can easily decode wave-related conceptual problems.
The time period of a simple pendulum depends solely on its length and acceleration due to gravity ($T = 2\pi\sqrt{l/g}$); it is completely independent of the mass of the bob or its amplitude of oscillation.
Key Topics Covered in Physics Quiz 5
- Simple Harmonic Motion (SHM): Kinematics of SHM, energy conservation in mass-spring systems, simple pendulums, phase angles, and acceleration-displacement proportions.
- Wave Motion Fundamentals: Transverse vs. longitudinal waves, wavelength, frequency, wave speed equation ($v = f\lambda$), and phase differences.
- Sound Waves and Standing Waves: Speed of sound in gases (Laplace correction), harmonics in open and closed organ pipes, nodes, and antinodes.
- Doppler Effect: Apparent shift in frequency when a sound source and observer are in relative motion towards or away from each other.
SHM & Wave Formulas
- Pendulum Time Period: $T = 2\pi\sqrt{\frac{l}{g}}$
- Mass-Spring Time Period: $T = 2\pi\sqrt{\frac{m}{k}}$
- Wave Equation: $v = f\lambda$
Take Physics Quiz 5 below to evaluate your speed and comprehension regarding oscillations, waves, and sound formulas.