| 1 |
To get high resolving power for a telescope one should use |
Objective of large aperture
Objective of large focal length
Eye piece of large focal length
Eye piece of small focal length
|
| 2 |
The frequency of light ray is 6 x 1014 Hz. The frequency when it propagates in a medium of refractive index 1.5 will be |
6 x 10<sup>14</sup> Hz
4 x 10<sup>14</sup> Hz
9 x 10<sup>14</sup> Hz
1.67 x 10<sup>14</sup> Hz
|
| 3 |
Rainbow is formed due to combination of |
Dispersion and total internal reflection
Reflection and refraction
Dispersion and focusing
Refection and scattering
|
| 4 |
Spectrum of sun consists of |
Bright lines
Dark lines
Bright bands
Dark bands
|
| 5 |
Focal length of convex lens is maximum for |
Blue light
Yellow light
Green light
Red light
|
| 6 |
Wavelength of light of frequency 100 Hz is |
2 x 10<sup>6 </sup>m
3 x 10<sup>6 </sup>m
4 x 10<sup>6 </sup>m
5 x 10<sup>6 </sup>m
|
| 7 |
One cannot see through fog becuase |
Fog absorbs light
The refractive index of fog is infinity
Light suffers total reflection at the droplet in a fog
Light is scattered by the droplets in fog
|
| 8 |
In young s interference experiment one slit is covered with a cellophane paper which absorbs half the intensity then |
No fringes are observed
All fringes will be darks
bright fringes will be less bright and dark will be less dark
Bright fringes will be brighter and dark fringes will be darks
|
| 9 |
In Newton s rings the central spot appears dark due to |
Phase change
Destructive interference
Small eye piece of optical device
Both a and b
|
| 10 |
Optically active substance are those substance which |
Produce polarization of polarized light
Rotate the plane of polarization of polarized light
Produce double refraction
Both a and b
|
| 11 |
Which of the following is not an application of polarization |
To reduce glare of light
To check concentration sugar in solution
Curtain less windows
All of these
|
| 12 |
A diffraction grating of length 2cm has 4000 lines The grating element is |
0.5 x 10<sup>-2</sup> cm
5 x 10<sup>4</sup>
5 x 10<sup>-4</sup>
0.5 x 10<sup>-4</sup> cm
|
| 13 |
In Michelsons interference the movable mirror is moved and a shift of two fringes is observed then the distance moved by the mirror is |
<span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">λ</span><font color="#000000" face="Georgia" size="4"><span style="line-height: 23.390625px;">/2</span></font>
<span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">λ</span>
2<span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">λ</span>
None
|
| 14 |
For single slit diffraction the first minimum occurs when |
dsinθ = <span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">λ</span>
dsinθ = <span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">λ</span>/2
dsinθ = 2<span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">λ</span>
dsinθ = m<span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">λ</span>
|
| 15 |
In Young s experiment the distance between two adjacent fringes for blue light is than that for green light |
Lesser
Greater
Equal
Lesser if distance between source and screen is large
|
| 16 |
In electromagnetic waves electric and magnetic field ar |
Parallel
Antiparallel
Perpendicular
Sometimes parallel sometimes perpendicular
|
| 17 |
The ratio of fringes with for bright and dark fringes is |
1 : 2
2 : 1
1 : 4
1 : 1
|
| 18 |
An oil film floating on water surface show colours due to |
Interference
Diffraction
Scattering
Reflection
|
| 19 |
A normal to the waves front showing direction of propagating of wave is called |
Photon
Particle
Ray
Line
|
| 20 |
In Young s double slit experiment if we use white light then |
Colored fringes will be observed
Bright fringes will be observed
Alternate dark and bright fringes will be observed
No interference fringes will be seen
|
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