[PPSC SUPDT. HOME DSSO, 2024]
46. The planetesimals made up of primarily water ice, dust or other frozen gases like CH4 (Methane) are knows as :
Black holes
Asteroids
Comets
Planets
47. Water, Sanitation and Hygiene' (WASH) is specifically targetted under which of the following SDGs (Sustainable Development Goals)?
SDG 1
SDG 6
SDG 16
SDG 5
48. Some common media in which speed of sound waves was measured are mentioned below:
1. Air
2. Steel
3. Water
What is the correct (increasing) order of the speed of sound in the media?
2<3<1
3<2<1
1<3<2
3<1<2
49. An object is immersed in a fluid. In order that the object becomes invisible, it should
behave as a perfect reflector, but must not obey Snell's Law.
Have Specific Gravity of 0.
Have Refractive Index as 1.
Have Refractive Index matching with that of the surrounding fluid.
50. Which one of the following is/are not a bacterial disease(s)?
AIDS
Dengue
Measles
All of the above