Best Resources for PAF Metrology Branch Physics Test Preparation
PAF Physics Tests Online (Part-3)
Q. Clausius’ statement of the Second Law states that:
A. Heat cannot spontaneously flow from cold to hot
B. Entropy always decreases
C. Perfect engines are possible
D. Energy cannot be created
Correct Answer: A. Heat cannot spontaneously flow from cold to hot
Q. Gauss’s Law relates electric flux to:
A. Enclosed charge
B. Current density
C. Magnetic fields
D. Potential difference
Correct Answer: A. Enclosed charge
Q. Kirchhoff’s Voltage Law states that:
A. ฮฃV = 0 in a closed loop
B. ฮฃI = 0 at junctions
C. P = IยฒR
D. V = IR
Correct Answer: A. ฮฃV = 0 in a closed loop
Q. Ampere’s Circuital Law relates magnetic field to:
A. Enclosed current
B. Electric flux
C. Charge density
D. Resistance
Correct Answer: A. Enclosed current
Q. Maxwell’s equations unify laws of:
A. Electricity and magnetism
B. Mechanics and thermodynamics
C. Optics and acoustics
D. Quantum and classical physics
Correct Answer: A. Electricity and magnetism
Q. Shear Modulus measures resistance to:
A. Tensile deformation
B. Volume change
C. Angular deformation
D. Surface stress
Correct Answer: C. Angular deformation
Q. Bulk Modulus measures resistance to:
A. Compression
B. Stretching
C. Twisting
D. Bending
Correct Answer: A. Compression
Q. The constancy of light speed is a postulate of:
A. Newtonian mechanics
B. Thermodynamics
C. Special Relativity
D. Quantum theory
Correct Answer: C. Special Relativity
Q. Planck’s quantum hypothesis states energy is:
A. Continuous
B. Proportional to wavelength
C. Quantized (E=nhฮฝ)
D. Always conserved
Correct Answer: C. Quantized (E=nhฮฝ)
Q. The photoelectric effect demonstrates:
A. Wave nature of light
B. Particle nature of light
C. Light refraction
D. Light interference
Correct Answer: B. Particle nature of light
