# MCQ Questions on Physics

**MCQ Questions on Physics**

**1-Energy gap in the Dirac electron energy spectrum is**

(A) mc^{2}

(B) -mc^{2}

(C) 2mc^{2}

(D) zero

**2-Gauss’s Law is a special case of**

(A) Coulomb’s Law

(B) Plank’s Law

(C) Faraday’s Law

(D) Ampere’s Law

**3-The divergence of which quantity will be zero?**

(A) B

(B) H

(C) D

(D) E

**4-The change in Kinetic Energy of an atomic system due to the magnetic field is because of the change in ___ of the atomic system.**

(A) Torque

(B) Angular momentum

(C) Angular velocity

(D) Angular acceleration

**5-The escape velocity for the planet mercury is**

(A) 34 km/sec

(B) 618 km/sec

(C) 61 km/sec

(D) 4.2 km/sec

**6-The Einstein’s mass-energy relation is**

(A) E = -mc^{2}

(B) E = -mc

(C) E = mc

(D) E = mc^{2}

**7-Escape velocity from the surface of earth is**

(A) 11.2 x 10^{3} km/s

(B) 11.2 x 10^{2} km/s

(C) 11.2 km/s

(D) 11.2 m/s

**8-For a maximum range on the horizontal plane, the angle of projection is**

(A) 90°

(B) 45°

(C) 30°

(D) 0°

**9-The kinetic energy of colliding particles after collision is ___ the kinetic energy before collision**

(A) less than or equal to

(B) equal to

(C) greater than

(D) less than

**10-The minimum wavelength of X-ray produced is**

(A) Inversely proportional to square root of accelerating potential

(B) Directly proportional to square root of accelerating potential

(C) Inversely proportional to accelerating potential

(D) Directly proportional to accelerating potential

**ANSWERS:**

**1-(C), 2-(A), 3-(A), 4-(C), 5-(D), 6-(D), 7-(C), 8-(B), 9-(D), 10-(C)**