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#1. Which one of the following quantities has not been expressed in proper units except?
#2. Three students measured the length of needle with a meter rod. Which of the following is correct measurement?
#3. Prefix Pico stands for
#4. Zero error of the instrument is a type of
#5. What are the base units of Planck’s constant h? Remember the energy of a photon is given by hf where f represents the frequency
#6. Identify the correct unit of pressure among these
#7. What is the ratio 1nm / 1μm ?
#8. Dimension of momentum is
#9. A projectile thrown at an angle of 30° has range 10m. Another projectile thrown at an angle of 60° with some initial velocity has range
#10. The speed of efflux is equal to the velocity gained by the falling fluid under the action of gravity through a certain height is known as
#11. The expression for Torricelli’s theorem is given by
#12. A 10 m high tank is full of water. A hole appears in its wall near its bottom. Taking the value of g as 9.8ms^-2 the speed of efflux is
#13. Venturi’s relation is given by
#14. The resolving power in the mth order for a diffraction grating equals to
#15. Light traveling through vacuum enters water. Which characteristic of light does not change?
#16. In a pond, water is 10 m deep. An object is held 15 m above water surface. Locate the image of the object in the water. (Refractive Index of water = 4/3)
#17. Which of the following colors will have minimum critical angle when light passes from glass to air?
#18. Which of the following radiation will be focused farthest from a convex lens?
#19. If a graph is plotted between time period of a pendulum and its length, the graph will be
#20. An object executing SHM has a velocity 3 cm/s when the displacement is 4 cm. It has a velocity of 4 cm/s when the displacement is 3 cm. The amplitude of motion of this object is
#21. A long steel pipe is tapped at its one end. A listener at the other end hears two sounds
#22. The normal temperature of a healthy human body on Kelvin scale is
#23. In which of the following cases Doppler’s effect cannot be observed?
#24. Stress that induces a change in the shape of the body is named as
#25. The SI unit of modulus of elasticity is
#26. If stress is increased beyond the elastic limit, a permanent change in the material is observed. This behavior is called
#27. A container of volume 8 * 10^-4 m^3 occupies 20 g oxygen kept at a temperature of 373K. Calculate oxygen pressure.
#28. The temperature at which the average K.E. of a molecule of a gas will be the same as that of an electron accelerated through 1 volt will be
#29. When a gas is isothermally expanded so that its volume becomes double, the rms velocity
#30. If internal energy of a gas decreases by an amount equal to the external work the gas is undergoing
#31. The kinetic theory of gases breaks down most at
#32. The electronic circuit which inverts the input signal is called
#33. The basic operations of Boolean algebra are
#34. Which expression represents a NOR operation?
#35. In a thermocouple minimum current flows at
#36. Production of heat due to an electric current flowing through a conduction is given by
#37. Resistance of an ideal insulator is
#38. The direction of the induced e.m.f or current is found by the use of
#39. If the coil is wound on an iron core, the flux through it will
#40. The phenomena of producing e.m.f. in the coil due to change of current in the coil itself is called
#41. On decreasing the intensity of incident light
#42. A radio transmitter is working at frequency 880 kHz and power 10 kW. The number of photons emitted per second will be
#43. When a photon of energy 7 eV is made incident on a metal then the emitted electron is stopped by a stopping potential of -5.5 V. The work function of metal will be
#44. The work function of aluminum is 4.2 eV. Light of wavelength 2000 Å is incident on it. The threshold frequency will be
#45. Fission of nuclei is possible because the binding energy per nucleon in them
#46. Starting with a sample of pure Cu_8^66 if it decays into Zn in 15 minutes the corresponding half life is
#47. 222_86 A -> 210_84 B in this reaction how many α and β emissions have occurred
#48. Stress beyond which a permanent deformation is observed in a body is called
#49. If one mole of an ideal gas is heated at constant volume then
#50. A good example of first law of thermodynamics is
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PHYSICS INITIAL TEST 7
Welcome to Physics Initial Test 7, 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 rotational dynamics, fluid mechanics, wave motion principles, thermodynamics, and high-frequency multiple-choice questions needed to clear your computer-based military entrance exam with distinction.
Key Topics Covered in Physics Initial Test 7
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:
- Rotational & Angular Dynamics: Moment of inertia, conservation of angular momentum, rotational kinetic energy, and flywheel equations.
- Fluid Mechanics & Surface Tension: Terminal velocity, Stokes’ law, viscosity, surface tension effects, and capillary action.
- Sound Waves & Acoustics: Speed of sound in various media, stationary waves in stretched strings and air columns, and acoustic resonance.
- Thermodynamic Cycles & Kinetic Theory: Pressure-volume ($P-V$) diagrams, root-mean-square speed of gas molecules, and internal energy variations.
High-Frequency Sample MCQs for Practice
Test your understanding with these representative Physics MCQs frequently asked in tri-services academic tests:
1. The moment of inertia of a solid sphere of mass $M$ and radius $R$ about its central axis is:
A) $\frac{1}{2} M R^2$
B) $\frac{2}{5} M R^2$
C) $\frac{2}{3} M R^2$
D) $M R^2$
Answer: B) $\frac{2}{5} M R^2$
2. According to Stokes’ Law, the viscous drag force acting on a spherical object falling through a fluid is directly proportional to its:
A) Mass
B) Radius
C) Volume
D) Density
Answer: B) Radius
3. The fundamental frequency of a closed organ pipe of length $L$ is given by (where $v$ is sound velocity):
A) $v / 2L$
B) $v / 4L$
C) $2v / L$
D) $4v / L$
Answer: B) $v / 4L$
4. When the temperature of an ideal gas is quadrupled (multiplied by 4), its root-mean-square ($v_{\text{rms}}$) speed becomes:
A) Doubled
B) Quadrupled
C) Halved
D) Unchanged
Answer: A) Doubled
5. Angular momentum ($L$) of a rotating rigid body is mathematically expressed as:
A) $I \omega$
B) $I \omega^2$
C) $\frac{1}{2} I \omega$
D) $F \cdot r$
Answer: A) $I \omega$
6. At terminal velocity, the net acceleration of a body falling through a fluid medium is:
A) $9.8\text{ m/s}^2$
B) Maximum
C) Zero
D) Variable
Answer: C) Zero
7. In a stationary wave, the distance between two consecutive nodes or two consecutive antinodes is:
A) $\lambda$
B) $\lambda / 2$
C) $\lambda / 4$
D) $2\lambda$
Answer: B) $\lambda / 2$
Detailed Overview of Physics Initial Test 7 Preparation
Preparing for Physics Initial Test 7 requires a strong understanding of angular mechanics, wave acoustics, and fluid behavior. In military selection centers, the computer-based Physics test evaluates both theoretical mastery and quick numerical estimation under tight time limits. Regular practice with structured practice modules sharpens your calculation speed, improves formula recall, and guarantees peak test-day performance.
Effective Revision Tips for Test 7
- Master Acoustic Node Distances: Memorize node-to-node ($\lambda / 2$) and node-to-antinode ($\lambda / 4$) distance ratios for stationary waves.
- Review Terminal Velocity Conditions: Understand that terminal velocity occurs when viscous drag force plus buoyant force equals weight ($\Sigma F = 0$).
- 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: Electrostatics & Electric Fields
Coulomb’s Law, Electric Flux, Gauss’s Law & Capacitance
Electrostatics examines charges at rest and the electric fields and potentials they produce. In military academic screening tests, electrostatic questions check your command over Coulomb’s law, electric field intensity, electric potential energy, Gauss’s law applications, and parallel plate capacitors. A solid grasp of these concepts allows you to resolve field calculations swiftly.
Remember that the electric field inside a charged hollow metallic sphere is always zero, regardless of the net charge residing on its outer surface.
Major Topics Covered in Physics Quiz 7
- Coulomb’s Law: Force between two stationary point charges, relative permittivity (dielectric constant), and vector form of electrostatic force in various media.
- Electric Field and Potential: Electric field intensity ($E = F/q$), electric potential difference, electron-volt unit definition, and equipotential surfaces.
- Gauss’s Law and Its Applications: Electric flux definition ($\Phi_E = E \cdot A$), Gauss’s law statement ($\Phi_E = q / \epsilon_0$), and electric field calculations around charged sheets and spheres.
- Capacitors and Capacitance: Parallel plate capacitor formula ($C = \frac{\epsilon_0 A}{d}$), effect of dielectric insertions, energy stored in capacitors, and series-parallel capacitor networks.
Electrostatic Equations
- Coulomb’s Law: $F = \frac{1}{4\pi\epsilon_0} \frac{q_1 q_2}{r^2}$
- Capacitor Stored Energy: $U = \frac{1}{2}CV^2 = \frac{1}{2}QV = \frac{Q^2}{2C}$
- Dielectric Effect: $C’ = \epsilon_r \cdot C$
Proceed to Physics Quiz 7 below to evaluate your competency in solving electrostatics and capacitor problems.