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Answers
Answer:
11 ) bluish green
12)pink
13)artery
14) lymph
Answer:
11. Option b) bluish green
12. Option a) pink
13. Option a) artery
14. Option c) lymph
15. Option a) is less than one
16. Option b)
Explanation:
11. Option a) bluish green
When copper oxide and aillute hydrochloric acid react, colour changes to bluish green, due to formation of cooper.
12. Option a) pink
When the sodium hydroxide, which is a base, is mixed with phenolphthalein, it turns pink. This happens because the base is neutralized in an acid solution l, which causes the indicator to become colorless. All of the base is neutralized by the citric acid.
13. Option a)
The arteries (red) carry oxygen and nutrients away from your heart, to your body's tissues. the veins (blue) take oxygen-poor blood back to the heart. Arteries begin with the aorta, the large artery leaving the heart. they carry oxygen-rich blood away from the heart to all the body's tissues.
14. Option c) lymph
Other than blood, another circulatory fluid present in the body is lymph. Lymph is colourless or transparent fluid which circulates inside the lymphatic system that include lymphatic vessels and lymph nodes.
15. Option a) is less than one
Convex mirrors are used in vehicles for rear view due to their wide field of view. Therefore, magnification (m) produced by a rear view mirror fitted in vehicles is less than one.
16. Option b)
While a light ray is travelling through air, its path is a straingh line. when the ray passes from air to glass(or any transparent material), the ray is, in general, bent at the surface of separation.