666: Health hazard floods are responsible for the spread of:
(a) Cholera
(b) Malaria
(c) Influenza
(d) Diarrhoea
667: Assertion (A) :
The temperature of a metal wire rises when an electric current is passed through it.
Reason (R):
Collision of metal atoms with each other releases heat energy.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is NOT a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
668: If a gas is compressed to half of its original volume at 27°C, to what temperature should it be heated to make it occupy its original volume ?
(a) 327°C
(b) 600°C
(c) 54°C
(d) 300°C
669: With reference to the latest developments in stem cell research, consider the following statements:
1. The only source of human stem cells are the embryos at blastocyst stage
2. The stem cells can be derived a without causing destruction to blastocysts
3. The stem cells can regenerate themselves in vitro virtually forever
4. Indian research centres also created a few cell lines which can be developed into many types of tissues
Which of these statements are correct?
(a) 1, 2, 3 and 4
(b) 1, 2 and 3
(c) 1, 2 and 4
(d) 3 and 4
670: Match List I (Ancient site) with List II (Archaeological finding) and select the correct answer using the codes given below the lists :
List I-------------------List II
(Ancient site)----------(Archaeological finding)
A. Lothal--------------1. Ploughed field
B. Kalibangan----------2. Dockyard
C. Dholavira-----------3. Terracotta replica of a plough
D. Banawali------------4. An inscription comprising ten large sized signs of the Harappan script
Codes:
A B C D
(a) 1 2 3 4
(b) 2 1 4 3
(c) 1 2 4 3
(d) 2 1 3 4