| 1 |
The refractive index of internal coating of optical fibre is: |
- A. 1.56
- B. 1.51
- C. 1.53
- D. 1.58
|
| 2 |
<p class="MsoNormal">The loudness of a sound is most closely related to its:<o:p></o:p></p> |
- A. <p class="MsoNormal">Frequency<o:p></o:p></p>
- B. <p class="MsoNormal">Period<o:p></o:p></p>
- C. <p class="MsoNormal">Wavelength<o:p></o:p></p>
- D. <p class="MsoNormal">Amplitude<o:p></o:p></p>
|
| 3 |
The S.I unit of power of a lens is: |
- A. Dioptre
- B. Volt
- C. Ampere
- D. Watt
|
| 4 |
Magnification of mirror is given by: |
- A. m=p/q
- B. m=q/p
- C. m=pxq
- D. m=1/p+q
|
| 5 |
A converging mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance? |
- A. 5.0 cm
- B. 7.5 cm
- C. 15 cm
- D. 20 cm
|
| 6 |
Focal length for concave mirror is : |
- A. -ve
- B. +ve
- C. same
- D. none of these
|
| 7 |
Angle opposite to the base of triangle of prism is called: |
- A. angle of incidence
- B. angle of refraction
- C. angle of prism
- D. emerging angle
|
| 8 |
The distance between principal focus and pole of mirror is called: |
- A. Princpal focus
- B. Focal length
- C. P
- D. Image
|
| 9 |
Concave mirror formula is given by: |
- A. R = 2r
- B. sin<i/sin<r
- C. 1/f=1/p+1/q
- D. 1/f=1/p-1/q
|
| 10 |
Bouncing back of light after striking the surface is called: |
- A. Refraction
- B. Reflection
- C. Diffraction
- D. Interference
|
