211: in the absence of electric field drag force is equal to……..
a) Electric force
b) Gravitational force
c) Both a & b
d) None of these
212: the value of ή for air is…..
a) 951 Kg/m3
b) 9.8 Kg/m3
c) 971 Kg/m3
d) 981 Kg/m3
213: refractive index can be measured by measuring the minimum angle deviation and
a) Refractive angle
b) Prism angle
c) Refracting angle
d) Minimum angle of deviation
214: if angle of incident become larger then critical angle then phenomena of
a) Reflection occurs
b) Refraction occurs
c) Total internal reflection occurs
d) Reflection simultaneous
215: property of light which does not change during refraction is
a) Direction
b) Speed
c) Frequency
d) Wavelength
216: Ratio of sin(x) of angle of incidence to sin(x) of angle of refraction is
a) Gravitational law
b) Reflection law
c) Refraction law
d) Snell’s law
217: a light ray has an angle of incidence of 34 degree. The reflected ray will make what
angle with the reflected angle
a) 0 degree
b) 34 degree
c) 56 degree
d) 66 degree
218: refractive index of water is
a) 0.33
b) 0.5
c) 1.5
d) 1.33
219: least count of spectrometer is
a) 1sec
b) 1mint
c) 1degree
d) 1mm
220: angle of minimum deviation will be maximum for
a) Red light
b) Blue light
c) Violet light
d) None of these
221: the lens presents in the telescope is called
a) Condenser lens
b) Objective lens
c) Normal lens
d) Projection
222: refractive index is equal to
a) Speed of light in material/speed of light in vacuum
b) Speed of light in material/speed of light in air
c) Speed of light in vacuum/speed of light in material
d) Speed of light in air/speed of light in material
223: the power light source used in new Plank’s constant apparatus is
a) 15 W
b) 25 W
c) 30 Wd) 35 W
224: the refractive index for blue ( 450nm) colour is ……
a) 1.502
b) 1.507
c) 1.509
d) 1.508
225: in plank’s constant apparatus the light source used is of
a) Halogen tungsten
b) Cathode tungsten
c) Caesium antimony
d) Both b & c
226: the model number of Lorentz force ( e/m ) demonstrator ( apparatus ) is …
a) J 2433
b) J 4633
c) J 2533
d) J 2333
227: the refractive index of violet colour at wavelength 434 nm for solid prism is
a) 1.489
b) 1.059
c) 1.521
d) 1.519
228: the refractive index of red colour at wavelength of 640 nm for solid prism is
a) 1.052
b) 1.520
c) 1.509
d) 1.445
229: the refractive index of solid prism ( glass crown ) is ….
a) 1.4
b) 1.05
c) 1.52
d) 1.45
230: the work function of visible light is about……. eV?
a) 4
b) 3
c) 2
d) 5
