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PHYSICS [2 Mark Question Answer]

Unit - 2.1 Measurement Of Density, Floatation And Sinking · ICSE STD 8 (ICSE - English Medium). 9 questions.

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[2 Mark Question Answer]

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9 questions · timed · auto-graded

Question 12 Marks
An empty density bottle weighs 22 g. When filled completely with water, it weighs 50 g. When filled completely with brine solution , it weighs 54 g. calculate:
(a) volume of density bottle
(b) density of brine solution
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Question 22 Marks
Volume of metal cube is 200 cm3. If the density of metal cube is 7.5 gcm-3, find the mass of metal cube in kilogram.
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Question 32 Marks
5 litres of kerosene oil is found to weigh 4.40 kg. Find the density of kerosene oil in
(a) CGS System
(b) SI System
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Question 42 Marks
An empty density bottle weighs 22 g. When filled completely with water, it weighs 50 g. When filled completely with brine solution , it weighs 54 g. calculate:
volume of density bottle
density of brine solution
Answer
SELF
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Question 52 Marks
Volume of metal cube is 200 cm3. If the density of metal cube is $7.5 gcm ^{-3}$, find the mass of metal cube in kilogram.
Answer
SELF
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Question 62 Marks
5 litres of kerosene oil is found to weigh 4.40 kg. Find the density of kerosene oil in
CGS System
SI System
Answer
SELF
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Question 72 Marks
Calculate the volume of wood of mass 6000 kg, when density of wood is $0.8 gcm ^{-3}$.
Answer
Volume of wood (V) = ?
Mass of wood (M) = 6000 kg
Density of wood D = 0.8 g/ Cm3
D=O.8g/Cm3=o=0.8 × I000 = 800kg /m3
D= M/V
V= M/D
=6000\800
=7.5m3
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Question 82 Marks
A piece of wood of mass 150 g has a volume of 200 cm3 . Find the density of wood in
CGS System
SI System
Answer
Mass of wood (M) = 150 g
Volume of wood (V) = 200 Cm3
Density (D) =?
D = MV/MV
=150/200
=0.75 gcm-3
In S.I. system = 0.75 × 1000
= 750 kg m-3
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Question 92 Marks
On the basis of change of density with the change in temperature, explain how do the liquids get heated up, when heated in a vessel.
Answer
When a liquid is heated in a vessel then first of all vessel is heated and it expands slightly because expansion of solids is less than liquid. Now liquid is heated and it expands more than solids. This expansion in solids and liquids is due to the increase in molecular vibration because of the heat energy which causes an increase in volume and decrease in density. If you still go on heating the liquid then due to vigorous molecular motions, separation in the molecules further increases and they are converted in to gaseous state which increases the volume and decreases the density.
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[2 Mark Question Answer] - PHYSICS STD 8 Questions - Vidyadip