SawaalBoxसवाल बॉक्स
2011 · Q50Science & TechnologyPhysicseasy

The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason ?

  1. (a)Ice is a bad conductor of heat
  2. (b)Since the surface of the lake is at the same temperature as the air, no heat is lost
  3. (c)The density of water is maximum at 4°C
  4. (d)None of the statements (a), (b) and (c) given above is correct
Show answerHide answer

Official answer(c) The density of water is maximum at 4°C

2015 · Q30Science & TechnologyPhysicsmoderate

In the context of modern scientific research, consider the following statements about ‘IceCube’, a particle detector located at South Pole, which was recently in the news : 1. It is the world’s largest neutrino detector, encompassing a cubic kilometre of ice. 2. It is a powerful telescope to search for dark matter. 3. It is buried deep in the ice. Which of the statements given above is/are correct?

  1. (a)1 only
  2. (b)2 and 3 only
  3. (c)1 and 3 only
  4. (d)1, 2 and 3
Show answerHide answer

Official answer(d) 1, 2 and 3