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 lighting flash and hearing the thunder of a cloud in 10s. if the speeds of sound and light in air are 330 m/s and 3 x respectively, how far away is the storm?
About 1650 m
About 990 m
About 3300 m
About 1000 m
what is the approximate wavelength of violet
0.7 pm
0.6 pm
0.5 pm
0.4 pm
Which electromagnetic radiation (s) is / are used to cook food?
Infrared radiation only
Microwave radiation only
Infrared microwave radiations
All electromagnetic radiations
An object is placed 10 cm in front of a lens. The image formed is real, inverted and of same size as the object. What is the focal length and nature of the lens?
5cm, converging
10cm, diverging
20cm, converging
20 cm, diverging
Which one of the following students 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 blurred and 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 objects.
