546: Which one of the following types of glass can cut off ultraviolet rays ?
(a) pyrex glass
(b) Soda glass
(c) Crookes glass
(d) Jena glass
547: With reference to the United Nations Convention on the Rights of the Child, consider the following:
1. The Right to Development
2. The Right to Expression
3. The Right to Recreation
Which of the above is/ are the Rights of the child ?
(a) 1 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1, 2 and 3
548: A ship sailing from the eastern extremity of the Aleutian Islands to Dutch harbour crosses 180° meridian at 23.30 hrs on January 1, 1999. What time and date will be recorded by the captain of the ship in his diary after one-hour journey from the point of crossing of the meridian ?
(a) January 1, 0030 hrs
(b) January 2, 0030 hrs
(c) January 3, 0030 hrs
(d) January 4, 0030 hrs
549: Sugarcane, sugarbeet, sweetpea, chickpea, pigeonpea and French bean belong to
(a) two plant families
(b) three plant families
(c) four plant families
(d) five plant families
550: The Function of heavy water in a nuclear reactor is to
(a) Stop the nuclear reaction
(b) Slow down the speed of neutrons
(c) Cool down the reactor
(d) Increase the speed of neutrons