I. Fill in the blanks
1. A physical change is generally
2. Souring of milk is a change
3. Melting of wax is a change
4. Burning of wax is a change
5. Grinding of wheat grain changes its size. It is a change
6. Acids turn blue Litmus into
7. acid is present in lemon
8. The acidic or basic nature of a substance is tested by using an
9.is a natural indicator
10. When an acidic solution is mixed with a basic solution they
water.
11. Time between one sunrise and the next Sunrise was called a
12. A is one billionth of a second
cach Other forming
13. The basic unit of time is a
14. The distance moved by an object in a unit time is called a
15. meter measures the distance moved by the vehicle
Answers
Answer:
1. Reversible
2. chemical change
3. physical change
4.chemical change
5.physical change
6.Red colour
7.citric acid
8. litmus paper
9. turmaric
10.neutralize each other forming salt and water.
11. A day
12. A femtosecond is the SI unit of time equal to 10-15 or 1⁄1 000 000 000 000 000 of a second; that is, one quadrillionth, or one millionth of one billionth, of a second. ... The word femtosecond is formed by the SI prefix femto and the SI unit second. Its symbol is fs
13.second
14.speed
15.An odometer or odograph is an instrument used for measuring the distance traveled by a vehicle, such as a bicycle or car.
Answer:
(a) Photosynthesis → Chemical change
(b) Dissolving sugar in water → Physical change
(c) Burning of coal → Chemical change
(d) Melting of wax → Physical change
(e) Beating aluminium to make aluminium foil → Physical change
(f) Digestion of food → Chemical change
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