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
Consider the following statements A and B and identify the correct answer given below:
(A) A body initially at rest is acted upon by a constant force. The rate of change of its kinetic energy varies linearly with time.
(B) When a body is at rest, it must be in equilibrium.
A and B are correct
A and B are wrong
A is correct and B is wrong
A is wrong and B is correct
A jet plane flies through air with a velocity of 2 Mach. While the velocity of sound is 332 m/s the airspeed of the plane is:
166 km/s
66.4 km/s
332 m/s
664 m/s
Which one among the following statements is correct?
Convex mirrors are used by doctors to examine oral cavity
Concave mirror are used as reflectors
Convex mirror are used as reflectors
Convex mirror should be used for shaving
Light travels in optical fiber irrespective of its shape because it is a device by which signals can be transferred from one location to another. It is based on the phenomenon of:
Diffraction of light
Refraction of light
Polarization of light
Total internal reflection of light
Which one among the following is the major cause of blurring and unsharp images of objects observed through very large telescope at the extreme limit of magnification ?
Air turbulence of earth’s atmosphere
Poor optical polish achievable on large mirrors
Poor tracking capacities of telescopes
Varying density of air in the Earth’s atmosphere
