Density of water is maximum at ______.
1). 12 degree Celsius
2). 8 degree Celsius
3). 4 degree Celsius
4). 0 degree Celsius
1. An atom with more neutrons than protons is called
2. The hydraulic brakes used in automobiles is a direct application of :
4. Parabolic mirrors are used in
5. The hair of shaving brush clings together when removed from water due to
6. When a piece of stone is immersed in water, it displaces water of equal
7. Which physical quantity is measured in 'siemens'?
8. A small gap is left at the joints of rails in a railway track to
10. For a ray of light to suffer total internal reflection it has to pass from :