Why we should not use foot step or hand span for measurement? (2)
Q5. How will you separate?
Alum in pure form &
Lighter husk from grains. (2)
Q6.Give one example of homogeneous and heterogeneous mix ture.(2)
Q7. Give name of two filters. (2)
Q8. Define periodic motion with an example. (2)
Answers
Why we should not use foot step or hand span for measurement?
The size of the foot and hand varies from person to person. If footsteps or hand span of two persons are used to measure the length respectively, then the two distances may not be equal. Thus, a footstep or hand span are not the constant quantities. Hence, they cannot be used as a standard unit of length.
Explanation:
How will you separate?
Alum in pure form &
Lighter husk from grains.
answer
winnowing
Give one example of homogeneous and heterogeneous mix ture.
Examples of homogeneous mixtures include air, saline solution, most alloys, and bitumen. Examples of heterogeneous mixtures include sand, oil and water, and chicken noodle soup.
Give name of two filters.
Two main types of filter media are employed in laboratories: a surface filter, a solid sieve which traps the solid particles, with or without the aid of filter paper (e.g. Büchner funnel, Belt filter, Rotary vacuum-drum filter, Cross-flow filters, Screen filter); and a depth filter,
Define periodic motion with an example
Periodic motion, in physics, motion repeated in equal intervals of time. Periodic motion is performed, for example, by a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, the Earth in its orbit around the Sun, and a water wave.