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 examples:
1) Twinkling of stars
2) Shining of air bubble
3) Depth of swimming pool floor appears smaller
4) Oval shape of the sun in morning and evening
Which of the examples given above are the illustration of Refraction?
1, 2 and 3
2, 3 and 4
1, 3 and 4
1 , 2 and 4
Which one of the following physical quantities is the same for molecules of all gases at a given temperature?
Speed
Mass
Kinetic energy
Momentum
A brick is thrown vertically from an aircraft flying two kilometres above the earth. The brick will fall with a
constant speed
constant velocity
constant acceleration
constant speed for some time then with constant acceleration as it nears the earth
The outside rear-view mirror of modern automobiles is marked with warning “objects in mirror are closer than they appear”. Such mirrors are
plane mirrors
concave mirrors with very large focal lengths
concave mirrors with very small focal lengths
convex mirrors
In winters, lakes and ponds freeze from the up to bottom because:
Surface water gets chilled rst
There is low pressure on surface
Water has maximum density at 4°C
Water has minimum density at 4°C
