hi can anyone solve this sample paper of science..class-10th
I'm trying to solve it!
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Answer:
5. By convention, the focal length of a concave mirror and a concave lens are taken as negative. Hence, both the spherical mirror and the thin spherical lens are concave in nature.
6. (2nd) The optical centre is the part through which a ray light passes without suffering any deviation.
10. Veins have thin walls because blood inside them flows with low pressure and speed. Veins have thin walls and have valves as they help in preventing the blood from flowing back/opposite in the wrong direction. Veins carry blood from different parts of the body towards the heart.
11. (2nd) Goat because herbivores eating grass need a longer small intestine to allow the cellulose to be digested.
12. (2nd) The number of trophic levels in an ecosystem is limited and is not more than 4. Because the amount of energy flow decreases with successive trophic level, as only 10% of energy is transferred from one trophic level to the next trophic level.
SORRY I CAN'T ANSWER ALL.....I JUST WANTED TO HELP YOU SO I ANSWERED AS MUCH I KNEW.... HOPE IT HELPS!
