Select the correct answer:

1. If the ratio of length and breadth of a rectangle is 4:7. Find the length while its breadth is 77 cm.

2. Which medicine is known as 'THE QUEEN OF DRUGS'?

3. 'மருந்துகளின் இராணி' என அழைக்கப்படும் மருந்து பொருள் எது?

4. A man bought an old bicycle for Rs. 1,500. He spends Rs.500 on its repair and sells it for Rs.1,800. Find the percentage of his loss.

5. ஒருவர் ரூ. 1,500-க்கு ஒரு பழைய மிதிவண்டியை வாங்கி அதில் ரூ. 500 - க்கு பழுதுகளை நீக்குகிறார். முடிவில் அவர் அந்த மிதிவண்டியை ரூ.1,800-க்கு விற்கிறார் எனில் அவர் அடையும் நஷ்ட சதவிகிதத்தைக் காண்.

6. Pick out the correct reasons:
Oil mixed with petrol for.two wheelers due to the following reason(s):
(1) It lubricates the engine parts.
(2) It remove heat inside two engines. .
(3)It allows for the deposit of carbon on the spark plug.

7. Match the following:
(a) Osmium 1. Best conductor of electricity
(b) Lithium 2. Heaviest metal
(c) Tungsten 3. Lightest metal
(d) Silver 4. Highest melting point - 3300°C
(a) (b) (c) (d)

8. Match List I with List II correctly:
List - I List - II
(Solution) (pH value)
(a) Blood 1. 6.5
(b) Urine 2. 7.3-7.5
(c) Vinegar 3. 5.5-7.5
(d) Milk 4: 2.4 3.4
(a) (b) (c) (d)

9. The theme of the World Special Week, celebrated from 4th October 2017 to 10th October 2017 is

10. Who among the following women boxers was declared best boxer of the meet during the World Youth Boxing Championship held in Guwahati in 2017?