INDIAN SCHOOL DARSAIT
Physics– Class IX
Topic: THRUST AND PRESSURE
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Worksheet #1
Name of Student: ____________________
Prepared By: Jayalakshmi Ratish
Class: IX
Date :
Section A–Theory Based questions
1.
Define thrust. What is the unit of thrust?
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2.
Why is it easier to swim in the sea water as compared to the river water?
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3.
Mention the forces shown in the figure –
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4.
A pressure of 200 Pa is acting on an area of 5 m2. Calculate the thrust exerted.
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5.
Give reason –
(a) Nails and pins have pointed tips.
(b) Tractors have broad tyres.
2
6.
Define pressure. What is the unit of pressure? Give the formula for pressure exerted by a solid.
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7.
State Archimedes Principle. Mention two applications based on this principle.
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8.
Why does an iron nail sink in water while an ship remains floating?
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9.
What are factors affecting the pressure exerted by a liquid?
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10.
The volume of 50 g of a substance is 20 cm3. If the density of water is 1 g/cm3, will the substance float or
sink?
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11.
If two forces in the ratio of 5 :28 act on two areas 10 : 7, find the ratio of pressure exerted.
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12.
The volume of a 500 g sealed packet is 350 cm3. Will the packet float or sink in water if the density of
water is 1 g/cm3? What will be the mass of the water displaced by this packet?
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13.
(a) Define upthrust.
(b) What is the unit of upthrust?
(c) In what direction does the upthrust on a body due to the liquid act?
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14.
A 5 kg wooden block is kept on a table top. Its dimensions are 30 cm × 20 cm × 5 cm. Find the pressure
exerted by the wooden block on the table top if it is made to lie on the table top with its side of
dimensions –
(a) 30 cm × 20 cm
(b) 30 cm × 5 cm
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15.
(a) Define relative density.
(b) Mention two difference between density and relative density.
(c) The relative density of silver is 10.8. The density of water is 1000 kg/m3. What is the density of
silver?
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Section B - MCQ
16.
Select the correct way of taking the reading –
(a) 19.82
(c) 19.62
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(b) 19.70
(d) None of these
17.
If volume of glass stopper is 14 cm3 and mass of glass stopper is 35 g, then density is –
(a) 2.5 g/cm3
(b) 2.5 kg / m3
(c) 5 g / cm3
(d) N
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18.
A body weighs 400 g wt in air and 300 g wt in water. The upthrust on the body is (a) 50 g wt
(b) 200 g wt
(c) 100 g wt
(d) 100 N
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19.
Relative density is same as (a) Specific gravity
(c) Ratio between density of substance and
density of water
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20.
(b) Density
(d) Ratio between the density of water and
the density of the substance.
A body weighs 400 g wt in air and 300 g wt in water. The upthrust on the body is (a) 50 g wt
(b) 200 g wt
(c) 100 g wt
(d) 100 N
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