Direct sunlight provides thermal energy that increases the rate of evaporation, causing the water molecules in wet clothes to turn into vapor much faster than on cloudy or cold days.
7. How can you separate salt from water?
(A) Evaporation
(B) Winnowing
(C) Filtration
(D) None of these
Answer:
(A) Evaporation
Explanation:
By heating the saltwater solution, the water evaporates into steam, leaving the solid salt crystals behind.
8. In which season malaria is more common?
(A) Rainy season
(B) Winter
(C) Summer
(D) Spring
Answer:
(A) Rainy season
Explanation:
Malaria is spread by mosquitoes, which breed rapidly in the stagnant water that accumulates in puddles and containers during the rainy (monsoon) season.
9. What is Anaemia?
(A) Viral disease
(B) Iron deficiency disease
(C) Fungal disease
(D) Calcium deficiency disease
Answer:
(B) Iron deficiency disease
Explanation:
Anemia is a medical condition characterized by a lack of healthy red blood cells, most commonly caused by a dietary deficiency of iron, which is essential for producing hemoglobin.
10. Quinine is a medication used to treat malaria is obtained from:
(A) Leaf
(B) Fruit
(C) Bark
(D) Root
Answer:
(C) Bark
Explanation:
Quinine, the traditional and highly effective antimalarial drug, is extracted from the bark of the Cinchona tree.
