? GTU Engineering 1st Year MCQ | Physics-2110011 Summer 2017 Sem-2

### MCQ(s) of Physics(2110011) - Summer 2017 Sem-2

• Q. 1  The magnatic susceptibility is equal to ________
• (A) X=mH
(B) X=mH/B
• (C) X=m/H
(D) X=mB/H
• (C) X=m/H
• Q. 2  The internal or Lorentz field equals to______________
• (A) Ei = E + Ec
(B) E = (P/ 3ε0)
• (C) E = E + (P2/ 3ε0)
(D) Ei = E + ( P/ 3ε0)
• (D) Ei = E + ( P/ 3ε0)
• Q. 3  __________dB is the sound level for the threshold of pain.
• (A) 0 dB
(B) 120 dB
• (C) 110 dB
(D) 10-12 dB
• (B) 120 dB
• Q. 4  Magnetostriction effect is obtained from ________ material.
• (A) Dia
(B) Pera
• (C) Ferro
(D) Ferri
• (C) Ferro
• Q. 5  The resistivity of liquid helium drops to zero at _______ K
• (A) 3.8 K
(B) 4.2 K
• (C) 6 K
(D) 0 K
• (B) 4.2 K
• Q. 6  From the following , Soft magnetic materials are used in ________
• (A) transformer cores
(B) dc meters
• (C) microphones
(D) compass needles
• (A) transformer cores
• Q. 7  ____________is the process to synthesize Metallic Glass
• (A) ball milling
(B) plasma arching
• (C) melt spinning technique
(D) CVD
• (C) melt spinning technique
• Q. 8  The following are the structure of CNT
• (A) Chiral
(B) Armchair
• (C) zigzag
(D) all of these
• (C) zigzag
• Q. 9  The dimensional formula for frequency of ultrasonic sound is
• (A) M0L0T0
(B) M0L-1T0
• (C) M0L0T-1
(D) M0L-1T-1
• (C) M0L0T-1
• Q. 10  Curie - Weiss law is ________
• (A) χ = C/ (T-θ)
(B) χ = C/ (2T-θ)
• (C) χ = C/ (T+θ)
(D) none of this
• (A) χ = C/ (T-θ)
• Q. 11  In Nd: YAG laser ______ kind of pumping is used.
• (A) optical pumping
(B) direct electron excitation
• (C) inelastic atom collision
(D) none of these
• (A) optical pumping
• Q. 12  The mathematical expression for existence of stimulated emission is proposed by ___________
• (A) Newton
(B) Ohm
• (C) Pascal
(D) Einstein
• (D) Einstein
• Q. 13  The electronic polarization of a solid material which contains N number of atoms are
• (A) Pe = N 2 π ε0 R3 E
(B) Pe = N π ε0 R3 E
• (C) Pe = N 4 π ε0 R3 E
(D) Pe = N 4 π ε0 R3
• (C) Pe = N 4 π ε0 R3 E
• Q. 14  According to Snell's law
• (A) n1/n2 = sin  φ1 / sin  φ2
(B) n1/n2 = sin  φ2 / sin  φ1
• (C) n1/n2 = sin  φ1 + sin  φ2
(D) n1/n2 = sin2  φ1 / sin2  φ2
• (B) n1/n2 = sin  φ2 / sin  φ1