Options:
- A. change in its K.E always
- B. change in its P.E always
- C. change in its K.E and change in its P.E
- D. neither change in K.E and nor change in its P.E
View Answer
C. change in its K.E and change in its P.E
Physics
A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to ____________________?
Options:
- A. 500 mm
- B. 5 x 10-3 mm
- C. 2 x 10-5 mm
- D. 2 x 10-3 mm
View Answer
D. 2 x 10-3 mm
The consumption of energy by a 60 watt bulb in 2 sec is_________________?
Options:
- A. 120 J
- B. 60 J
- C. 30 J
- D. 0.02 J
View Answer
A. 120 J
The tides raise the mater in the see roughly in a day___________________?
Options:
- A. once
- B. twice
- C. four time
- D. eight time
View Answer
B. twice
Which one of the following bulbs has the least resistance ?
Options:
- A. 100 watt
- B. 200 watt
- C. 300 watt
- D. 60 watt
View Answer
C. 300 watt
In monochromatic red light a blue book will probably appear to be_________________?
Options:
- A. black
- B. purple
- C. green
- D. no scientific reasoning available
View Answer
A. black
Optical active crystals rotates the __________________?
Options:
- A. vibrating plane
- B. polarization plane
- C. diffraction plane
- D. interference plane
View Answer
B. polarization plane
In double slit experiment if one of the two slit is covered then________________?
Options:
- A. no interference fringes are observed
- B. no diffraction fringes are observed
- C. no fringes observed
- D. interference pattern not disturbed
View Answer
A. no interference fringes are observed
In double slit experiment we observe _____________________?
Options:
- A. interference fringes only
- B. diffraction fringes only
- C. both interference and diffraction fringes
- D. polirized frringes
View Answer
C. both interference and diffraction fringes
In the shadow of a ball the central portion appears bright that happens due to_________________?
Options:
- A. Interference
- B. Diffraction
- C. Polarization
- D. Refraction
View Answer
B. Diffraction