Physics
Grade-8
Easy
Question
A charged plastic rod attracts _____ pieces.
- Paper
- Iron
- Rubber
- Mica
Hint:
Paper
The correct answer is: Paper
- A charged plastic rod attracts paper pieces.
- The positively charged rod attracts the electrons of a paper piece towards itself.
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There are ____ types of charges that can accumulate on a non-charged body.
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(ii). It is used to separate the mixture of acetone and water
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(iv). This method can also be used to separate those components that have very high boiling points.
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(i). This method is used to separate the different gases from air.
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Read the following paragraph and fill in the blanks by choosing the correct option.
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When a crude oil(petroleum) is subjected to fractional distillation, The component (i)_______ out last. This component is used for making paints and surfacing roads. The another component which comes out at 40℃ is (ii)______ And is used for fuels in vehicles. The component which distil out at 330℃ is (iii)_____.
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In the below table the boiling point of a few gases are given. The liquid mixture which contains these all gases are fractionally distilled. What will be the order of gases distilling out?
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In the process of vacuum distillation the pressure of _______ above the solvent is lowered.
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(2) The liquid-liquid mixture is poured into the separating funnel clamped vertically.
(3) The light component remains in the flask.
(4) The liquid with higher density settles down at the bottom of the flask
(5) The mixture is allowed to stand where clear layers of liquids are formed.
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(1) The nozzle tap is opened gradually and the denser component is allowed to the dropdown.
(2) The liquid-liquid mixture is poured into the separating funnel clamped vertically.
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