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Classify the following into slow and fast changes:
(i) Spinning of top
(ii) Formation of day and night
(iii) Formation of curd from milk
(iv) Change of season
(v) Making curd from milk by adding lemon juice.
(i) Spinning of top - Fast change
(ii) Formation of day and night- Slow change
(iii) Formation of curd from milk- Slow change
(iv) Change of season- Slow change
(v) Making curd from milk by adding lemon juice- Fast change
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- Formation of curd from milk is a/ ani. physical and irreversible changeii. irreversible and desirable changeiii. chemical and undesirable changeiv. physical and desirable change
- Is the formation of curd a chemical change?
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- What is the process of getting curd from milk known as?
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- Which among the following are not the functions of testes at puberty?(i) formation of germ cells (ii) secretion of testosterone (iii) development of placenta(iv) secretion of estrogen (a) (i) and (ii) (b) (i) and (iii) (c) (ii) and (iv) (d) (iii) and (iv)
- Fresh milk has a pH of 6. When it changes into curd (yogurt), will its pH value increase or decrease? Why?
- Which of the following are chemical changes?(i) decaying of wood(ii) burning of wood(iii) sawing of wood(iv) hammering of a nail into wood(a) (i) and (ii) (b) (ii) and (iii)(c) (iii) and (iv) (d) (i) and (iv)
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