Indian army has published the notification for SSC Tech 56 men and SSC Tech 27 women for the course commencing at OTA Chennai from April 2021
The time elapsed between viewing a lightning flash and hearing the thunder of a cloud is 10 s. If the speeds of sound and light in the air are 330 m/s and 3 × 108 m/s respectively, how far away is the storm?
About 1650 m
About 3300 m
About 990 m
About 1000 m
What is the approximate wavelength of violet light in air?
0.7 µm
0.6 µm
0.5 µm
0.4 µm
Which one of the following statements with regard to a short-sighted person is correct?
A short-sighted person sees the near objects blurred but distant objects clearly and a convex lens is used to correct this defect.
A short-sighted person sees the near objects clearly but distant objects are blurred and a concave lens is used to correct this defect
A short-sighted person sees the near objects blurred but distant objects clearly and a concave lens is used to correct this defect.
A short-sighted person sees the near objects clearly but distant objects blurred and a convex lens is used to correct this defect.
When a white light beam is made to fall on a hollow prism filled with water, it breaks into seven constituent colors. Which of the following colors suffers the maximum angle of deviation?
Red
Violet
Green
All suffer by equal amount of deviation
Which one among the following is not a luminous object?
Sun
Proxima Centauri
Jupiter
Alpha Centauri
