Welcome to Physics Initial Test 3, 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. In an experiment to determine acceleration due to gravity by simple pendulum, a student commits 1% positive error in the measurement of length and 3% negative error in the measurement of time period. The percentage error in the values of g will be
#2. The dimensions of the coefficient of viscosity are
#3. If the error in the measurement radius of a sphere is 1 %, then the error in the measurement of volume will be
#4. The ratio of the atomic radius to nuclear radius is
#5. One fermi is equivalent to
#6. Debye is the unit of
#7. The units of the temperature coefficient of resistant are
#8. Force due to water flow is
#9. Trajectory of projectile is
#10. The spherical object will have the terminal velocity
#11. The centre of gravity of an object is
#12. An object moving with acceleration g is said to fall freely. Identify freely falling objects from the list given below
#13. The two forces of a couple do not follow the rule that
#14. Sky seems Blue due to
#15. According to Young’s experiment the distance between two adjacent bright fringes of blue light is than for orange light
#16. Who gave the corpuscular nature of light?
#17. We can use Fibre optics system for
#18. There will be no change in ______ of Light entering glass
#19. The curve between acceleration and velocity of a particle executing SHM is a an
#20. On increasing the length of a second’s pendulum by Z% its time period will
#21. The ratio of the P.E of a particle executing SHM when at extreme position its total energy is
#22. The time period of a simple pendulum of infinite length is
#23. If G becomes four times then ‘g’ will become
#24. Material with smaller hysteresis loop area are best for the construction of
#25. Which of the given strains can also be written as tanθ
#26. Reciprocal of bulk modulus is called
#27. Consider the quantity MkT / pV of an ideal gas where M is the mass of the gas. It depends on the
#28. ______ is an irreversible process?
#29. In which stroke of petrol engine fuel is ignited?
#30. The following expression represent ΔU = -W
#31. A gas performs the most work when it expands
#32. In forward bias, semiconductor diode acts as
#33. In depletion region charge carriers are
#34. Basically transistor is
#35. If two conducting spheres of radii r1 and r2 are charged such that they have the same electric field on their surfaces. The ratio of the electric potential at their centres will be
#36. A 60 W bulb operates on 220 V supply. The current flowing through the bulb is
#37. Battery is charged in motor cars, which is based on
#38. The intensity of magnetization depends on magnetizing field. For its low value
#39. A transformer
#40. The armature current in a DC motor is maximum when the motor has
#41. Diffraction of x-rays was first studied by
#42. Lasers are classified as
#43. De-Broglei’s wavelength is
#44. The reciprocal of decay constant of a radioactive element is called its
#45. In nuclear fission the energy released per fission is
#46. The binding energy per nucleon of U235 is
#47. The minimum mass of uranium required to start chain nuclear reaction is called
#48. Control rods in nuclear reaction consist of
#49. Laws of motion are valid in a frame which is
#50. Under normal circumstances, the volume of the blood is sufficient to keep the vessels
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PHYSICS INITIAL TEST 3
Welcome to Physics Initial Test 3, 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 thermodynamics, electrostatics, electric circuits, and high-frequency multiple-choice questions needed to clear your computer-based military entrance exam with distinction.
Key Topics Covered in Physics Initial Test 3
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:
- Thermodynamics & Heat: First and second laws of thermodynamics, isothermal and adiabatic processes, Carnot engine efficiency, and molar specific heat capacities.
- Electrostatics & Capacitance: Coulomb’s law, electric field intensity, electric potential difference, Gauss’s law, and capacitor energy storage.
- Current Electricity & Circuits: Ohm’s law, Kirchhoff’s laws, wheatstone bridge balance conditions, temperature coefficient of resistance, and electrical power.
- Electromagnetism: Magnetic force on moving charges, Ampere’s law, magnetic flux density, and solenoid magnetic fields.
High-Frequency Sample MCQs for Practice
Test your understanding with these representative Physics MCQs frequently asked in tri-services academic tests:
1. In an adiabatic process, which of the following quantities remains strictly constant?
A) Temperature
B) Pressure
C) Heat content ($Q$)
D) Volume
Answer: C) Heat content ($Q$)
2. The maximum theoretical efficiency of a heat engine depends solely on:
A) The nature of the working substance
B) The temperatures of the source and sink
C) The pressure of the gas
D) The mass of the fuel used
Answer: B) The temperatures of the source and sink
3. The electric field intensity inside a hollow charged conducting sphere is:
A) Maximum
B) Zero
C) Infinite
D) Dependent on radius
Answer: B) Zero
4. Two equal charges are separated by a distance $r$. If the distance is halved, the Coulomb force between them becomes:
A) Double
B) Half
C) Four times
D) One-fourth
Answer: C) Four times
5. What is the equivalent resistance of three $6\ \Omega$ resistors connected in parallel?
A) $18\ \Omega$
B) $6\ \Omega$
C) $2\ \Omega$
D) $3\ \Omega$
Answer: C) $2\ \Omega$
6. Kirchhoff’s First Rule ($\sum I = 0$) is a direct statement of the conservation of:
A) Energy
B) Momentum
C) Charge
D) Mass
Answer: C) Charge
7. The SI unit of magnetic flux density ($B$) is:
A) Weber
B) Tesla
C) Henry
D) Gauss
Answer: B) Tesla
Detailed Overview of Physics Initial Test 3 Preparation
Preparing for Physics Initial Test 3 requires a solid grasp of thermodynamic cycles and electromagnetic principles. In military selection centers, the computer-based Physics paper evaluates both your rapid formula execution and conceptual clarity under tight deadlines. Regular practice with structured questions helps streamline circuit analysis, master thermal laws, and build complete confidence for test day.
Effective Revision Tips for Test 3
- Master Circuit Laws: Understand the physical basis behind Kirchhoff’s laws—Current Law (Charge Conservation) and Voltage Law (Energy Conservation).
- Review Thermodynamic Equations: Pay close attention to work done formulas in isothermal ($\Delta U = 0$) vs adiabatic ($Q = 0$) expansions.
- Practice Timed Quizzes: Solve questions under timed conditions to adapt to the time constraints of military selection computer tests.
Useful Resources & Next Steps
- Next Quiz: Practice Physics Initial Test 4
- Main Hub: Access All Forces Academic Online Quizzes
- Official Websites:
Physics Academic Test Preparation: Work, Energy, Power & Momentum
Work-Energy Theorem, Conservative Forces & Power Calculations
Energy transformations and work calculations are among the highest-yielding topics in the Pakistan Armed Forces recruitment exams. Candidates are frequently asked conceptual and calculation-based questions involving kinetic energy, potential energy, work done by variable forces, power ratings, and conservation principles. Mastering this module ensures swift points during your initial computer test.
Work done is zero if the applied force is perpendicular to the displacement ($\theta = 90^\circ$), such as centripetal force acting on a satellite in a circular orbit.
Core Topics Covered in Physics Quiz 3
- Work Done by Constant and Variable Forces: Scalar product definition ($W = F \cdot d \cos\theta$), positive, negative, and zero work scenarios, and graphical work estimation under force-displacement curves.
- Work-Energy Theorem: Equating net work done on an object to its change in kinetic energy ($\Delta K = W$).
- Conservative and Non-Conservative Forces: Gravitational and electrostatic fields as conservative forces; friction and air resistance as non-conservative dissipative forces.
- Power and Efficiency: Definition of power ($P = \frac{W}{t} = F \cdot v$), units of power (Watts, Horsepower), and mechanical efficiency calculations.
Essential Energy Formulas
- Kinetic Energy: $K = \frac{1}{2}mv^2 = \frac{p^2}{2m}$
- Gravitational Potential Energy: $U = mgh$
- Power & Velocity Relation: $P = F \cdot v$
Attempt Physics Quiz 3 below to evaluate your speed and accuracy in solving energy and power problems.