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PHYSICS [1 Mark Question Answer]

Physical Quantities and Measurement · ICSE STD 7 (ICSE - English Medium). 20 questions.

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[1 Mark Question Answer]

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20 questions · timed · auto-graded

Question 11 Mark
The density of a substance can tell about its purity. True or false? Explain.
Answer
True. If we know the density of a pure substance, we can compare it with the density of the given substance.
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Question 21 Mark
Can we measure the volume of a regular solid using a measuring cylinder?
Answer
Yes, we can also measure the volume of a regular solid using a measuring cylinder.
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Question 31 Mark
How many litres of water will a cubical vessel hold if its side measures $50 \ cm$?
Answer
Volume of a cube $= ($side$)^3$
$= 50 \times 50 \times 50$
$= 125000 \ cm^3$
$= 125000\ mL$
$= 125\ L$
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Question 41 Mark
Find the volume of $20$ ice cubes$,$ each of side $5 \ cm.$
Answer
Volume of $1$ ice cube $= ($side$)^3$
$= 5 \ cm \times 5 \ cm \times 5 \ cm = 125 \ cm^3$
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Question 51 Mark
Find the volume of an ice$-$cream brick of length $22 \ cm$, breadth $10 \ cm$ and height $8 \ cm.$
Answer
Volume of the ice cream brick $=$ Length $\times$ Breadth $\times$ Height $= 22 \ cm \times 10 \ cm\times 8 \ cm = 1760 \ cm^3$​​​​​​​
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Question 61 Mark
The length and breadth of a park is $60 \ m$ and $40 \ m$ respectively. Find its area.
Answer
Area of the park $=$ Length $\times$ Breadth $= 60 \ m \times 40 \ m = 2400 \ m^2$
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Question 71 Mark
A train covers a distance of 820 km with a speed of 80 km/h. How long does it take to finish the journey?
Answer
Time $=\frac{\text { Distance }}{\text { Speed }}=\frac{820}{80}=10.25$ hours
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Question 81 Mark
How long will it take an object moving with a speed of $5\ m/s$ to cover a distance of $20 m$?
Answer
$\text { Time }=\frac{\text { Distance }}{\text { Speed }}$
$\text { Time }=\frac{20}{5}=4 s $
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Question 91 Mark
An express train moves at a speed of $60 \ km \ h_1.$ How far will it travel in $3 h$?
Answer
$\text { Distance }=\text { Speed } \times \text { Time }$
$\text { Distance }=60 \times 3=180 \ km $
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Question 101 Mark
Calculate the speed of an object if it covers $200$ metres in $50$ seconds.
Answer
$\text { Time }=\frac{\text { Distance }}{\text { Speed }}$
$\text { Speed }=\frac{200}{50}=4\ m / s $
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Question 111 Mark
The density of copper is $8.4\ g \ cm^3.$ What will be the volume of $200\ gm$ of copper?
Answer
Density of copper $=8.4 g \ cm ^3$
Mass $=200 g$
$V =\frac{M}{D}$
$=\frac{200}{8.4}$
$=23.8 \ cm ^3$
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Question 121 Mark
Calculate the density of a solid of mass $20 \ kg$ if it occupies a volume of $4 m^3.$
Answer
$\text { Mass of solid }=20 \ kg$
$\text { Volume }=4 m ^3$
$\text { Density }=\frac{M}{V}=\frac{20}{4} b =5 \ kg / m ^3$
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Question 131 Mark
Find the density of the stone.
Answer
$\text { Density }=\frac{\text { Mass }}{\text { Volume }}$
$\frac{250 g }{50 \ cm ^3}=5\ g \ cm ^{-3}$
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Question 151 Mark
Define speed. Write its SI unit.
Answer
The distance travelled by a body in unit time is known as its speed. The SI unit of speed is metre per second (m/s).
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Question 161 Mark
Why is iron heavier than wood for the same volume?
Answer
Iron is heavier than wood for the same volume because the density of iron is greater than that of wood.
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Question 171 Mark
Define density of a substance. State the unit of density in the $SI$ system.
Answer
Density of a substance is defined as the volume of a body is the total three$-$dimensional space occupied by it. The $SI$ unit of density is $\ kg/m^{-3} or \ km \ m^{-3}.$
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Question 181 Mark
What do you understand by the term capacity?
Answer
The maximum volume of a liquid that a container can hold is known as its capacity.
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Question 191 Mark
What do you understand by the term area?
Answer
The amount of surface enclosed by a plane figure is called its area.
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Question 201 Mark
How will you calculate the distance covered by a body if its speed and time taken are given?
Answer
If an object travels for time t at speed v, it covers a distance given by s = v $\times$ t.
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[1 Mark Question Answer] - PHYSICS STD 7 Questions - Vidyadip