171: The unit of specific heat of water is
a) J kg/k
b) J kg k
c) J/kg/k
d) none of these
172: The actual value of e/m is
a) 1.7*10-11esu/gm
b) 1.7*1017esu/gm
c) 1.7*1019esu/gm
d) none of these
173: The cross sectional area A of copper bar of sear’s apparatus is measured
using……..formula
a) 1/2 πd2
b) 1/4 πd2
c) 2/3 πd2
d) 3/2 πd2
174: The diameter of Lee disk……inch
a) 1.497
b) 2.497
c) 3.497
d) none of these
175: In planks constant experiment the actual value of backing off voltage for blue filter is
a) 0.25V
b) 0.63V
c) 0.77V
d) none of these
176: In planks apparatus photo electron tube is made of……..cathod
a) Cobalt antimony
b) cobalt caesium
c) caesium antimony
d) none of these
177: One Tesla is equal to……
a) 1weber/m2
b) 106weber/m2
c) 10weber/m
d) none of these
178: In Cauchy’s constant, B has a dimension of
a) length
b) area
c) time
d) none of these
179: velocity of sound is ……. In liquid then in gases
a) Greater
b) Smaller
c) Same
d) None of these
180: the unit of sound intensity is ……
a) N/m2
b) W/m2
c) J/sec. m-2
d) None of these
181: threshold of pain is
a) 130 dB
b) 110 dB
c) 100 pa
d) 40 pa
182: auditory threshold at 1 kHz…….pa
a) 2*10-3
b) 2*10-5
c) 2*101
d) 0
183: 1 pascal will be equal to SPL of …… dB
a) 60
b) 92
c) 94
d) 120
184: the standard pressure in air is……micro Pascal which is usually considered the threshold
of hearing a) 20
b) 30
c) 40
d) 35
185: the SI unit of magnetic induction B is….
a) Tesla
b) Newton/meter
c) Newton/m2
d) Gauss
186: the soft magnetic material have……type of BH curve
a) Narrow
b) Wide
c) It is not a closed loop
d) None of these
187: in CGS system the unit of ‘H’ is
a) Wb/m2
b) Amp-turn/m
c) Dersted
d) Both b&c
188: the permeability of diamagnetic material is
a) µ > 1
b) µ < 1
c) µ = 1
d) µ ≤ 1
189: the u-value of 20/20 AM model of polar plani meter is …….inch2
a) 0.129
b) 0.015
c) 0.01
d) 0.1
e) 0.02
