Science Reporter, DECEMBER 2016 58

TEST

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1. Which of the following plants is the source of blue dye?a) Lawsonia alba b) Indigofera nctoriac) Rubia cordifolia d) Acacia catechu

2. Orange-yellow dye used for colouring silk and co on clothes is prepared from:a) Bixa b) Turmericc) Saff ron d) Manjistha

3. Which plant is the source of ancient brown dye used for colouring silk and co on clothes?a) Saff ron b) Hennac) Catechu d) Blood root

4. The only plant used for staining fi ngers, hands and nails by brown dye is:a) Catechu b) Hennac) Saff ron d) Manjistha

5. Which part of the plant Bixa orellana is used to prepare natural orange-yellow colour?a) Pericarp b) Flowerc) Aril d) Rhizome

6. Which part of the saff ron plant is used to produce red-yellow colour for food?a) Root b) S gmac) Petal d) Leaf

7. Which chemical cons tuent is responsible for yellow dye in palash tree?a) Orelline b) Bu nc) Lawson d) Galangin

8. Yellow colour in marigold is due to presence of:a) Patulitrin b) Curcuminc) Carthamin d) Purpurin

9. ‘Anthocyanin’, a poten al food colorant, is prepared from:a) Red cabbage b) Red onionc) Red radish d) Red amaranthus

10. Which of the following plants is s ll used by the cra dyers in Nepal?a) Indian madder b) Catechuc) Galangald) Henna

11. Which chemical cons tuent is responsible for forma on of blue colour in indigo?a) Bu nb) Indigo nc) Tannind) Carthamin

12. Peel of which fruit is used to prepare yellow colour?a) Mango b) Pomegranatec) Litchid) Orange

13. Blue colour in Cassia tora is prepared from:a) Woodb) Seedc) Rootd) Leaf

14. Which chemical cons tuent is responsible for yellow colouring property of turmeric?a) Tannin b) Robine nc) Curcumind) Purpurin

15. Red colouring pigment ‘aril’ of Amaranthus hypochondriacus is used to colour:a) Co onb) Silkc) Cra d) Food

16. Which part of the plant Adenanthera pavonina is used to produce red colour?a) Seed b) Woodc) Root d) Leaf

SOUMENDRA NATH DAS

Contributed by Soumendra Nath Das, H. No. B-1/359, P.O.-Kalyani, Nadia, West Bengal-741235

ANSWERS: 1) b 2) a 3) c 4) b 5) c 6) b 7) b 8) a 9) c 10) a 11) b 12) b 13) b 14) c 15) d 16) b

Science Reporter, DECEMBER 201659

TEST YOUR KNOWLEDGE

1. Where does the word “volcano” come from?a) Volume b) Star trekc) The god ‘Vulcan’ c) Italian for ‘angry’

2. Which is the tallest volcano in the world?a) Mauna Kea, US b) Tambora, Indonesiac) Mt. Etna, Italy d) Kilauea, US

3. What is magma?a) Lava that has cooled to a solidb) Liquid rock inside the earthc) Poisonous gas trapped under the Earth’s crustd) Liquid rock spewed from a volcano

4. Magma and _________ build up before exploding through holes in the Earth’s surface.a) Debris b) Toxic liquidsc) Lava d) Poisonous gases

5. Which of these is not a common gas in magma?a) Water vapour b) Carbon dioxidec) Sulfur dioxide d) Methane

6. Hot lava of volcanoes can mix with water to create a ____________.a) Strombolian explosion b) Steam explosionc) Base surge d) Plinian erup on

7. What is volcanic lava?a) Magma that erupts on to the Earth’s surfaceb) Ash that is spewed out onto Earth’s surfacec) Gas clouds created by volcanoesd) Molten rock deep in the Earth’s crust

8. Which country has the most historically ac ve volcanoes?a) Canada b) Italyc) US d) Indonesia

9. Which volcano buried the ancient town of Pompeii in Italy?a) Mt. Etna b) Teidec) Mt. Vesuvius d) Mt. Pelée

10. Magma with a high silica content tends to be:a) Very viscous b) Very smellyc) Very hot d) Very explosive

11. Which of the following does not aff ect the viscosity of magma?a) Silica content b) Temperaturec) Amount of gases d) All of these aff ect the viscosity of a magma

12. Most volcanoes are concentrated around the “Ring of fi re” which encircles __________ocean.a) Atlan c b) Pacifi cc) Indian d) Arc c

13. Which planet has the largest volcano in the solar system?a) Earth b) Uranusc) Mars d) Saturn

14. Which of these op ons is not a type of volcano?a) Shield b) Cinder conec) Composite d) Macarena

15. What is a hotspot?a) Hot lavab) Areas where magma breaks through the Earth’s crustc) A vent in the ground from which hot gas and steam escaped) A crater created by hot magma or lava mixing with water

16. Which lava only occurs under water?a) Pillow b) Magmac) Pahoehoe d) Aa

17. Which type of volcano has a very broad base with gentle slopes?a) Stratovolcano b) Calderac) Shield volcano d) Cinder cone

18. A typical example of shield volcano is:a) Mt. St. Helens b) Hawaiic) Mt. Rainier d) Mt. Pinatubo

19. Crater lake in Oregon is an example of:a) A shield volcano b) A volcanic bombc) A cinder cone d) A caldera

20. Obsidian is an igneous rock that:a) Solidifi ed very rapidly to form glassb) Solidifi ed very slowly to form pegma tec) Solidifi ed beneath earth’s surfaced) Solidifi ed in Earth’s mantle

21. What is a dormant volcano?a) A volcano that has erupted recentlyb) One that has not erupted in recorded historyc) A volcano that erupts occasionallyd) A volcano that will never erupt again

22. Volcanoes can cause:a) Global cooling b) Earthquakesc) Release of poisonous gases d) All of the above

SONAM CHOUDHARY

Contributed by Sonam Choudhary, Research Intern, Science Reporter,CSIR-NISCAIR, New Delhi

ANSWERS: 1) c 2) a 3) b 4) d 5) d 6) b 7) a 8) d 9) c 10) a 11) d 12) b 13) c 14) d 15) b 16) a 17) c 18) b 19) d 20) a 21) b 22) d