01-SCF-CBSE-PHYSICS-IX-BMT-1-THRUST AND PRESSURE-QP

SCF-CBSE-IX- PHYSICS-THRUST AND PRESSURE-BMT-01
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Time: 1Hr
Maximum Marks: 26
SCF-CBSE-IX
THRUST AND PRESSURE
INSTRUCTIONS:
1.
2.
All the questions are compulsory.
The question paper consists of 16 questions and are divided into 4 sections, A, B ,C and D.
3.
Question numbers 1 to 6 are in section A and are multiple choice questions.
Where you need to select one correct option out of the given four.
4.
5.
6.
7.
Question numbers 7 to 10 are in section B and are Very Short Answer Type Questions.
Question numbers 11 to 14 are in section C and are Short Answer Type Questions.
Question numbers 15 & 16 are in section D and are Long Answer Type Questions.
Use of calculators are not permitted.
SECTION-A
1.
A given solid is weighed in air using a spring balance. It is then weighed separately by immersing it
fully first in a vessel containing tap water and then in a vessel containing salt solution. The reading
of the spring balance would be:
1) Least in air
2) Least in water
2.
3) Least in salt solution
4) Equal in all the three cases.
The weight of a body felt in tap water and salty water are WA and WB respectively, then:
3.
1) WA = WB
Upthrust depends on:
4.
5.
2) WA > WB
3) WA < WB
4) WB = 2WA.
1) Density of the liquid
2) Dipped volume of the body immersed
3) Volume of the liquid
4) Both (1) and (2)
A student lowers a body in a liquid filled in a container. He finds that there is a maximum apparent
loss in weight of the body when:
1) It just touches the surface of the liquid
2) It is completely immersed in the liquid
3) It is partially immersed in the liquid
4) It is partially immersed and also touches the sides of the container.
Four students a, b, c and d while performing an experiment on establishing the relation between
the loss of weight of small solid when fully immersed in tap water, and the weight of water
displaced by it, used four different shapes of overflow cans containing water as shown:
(A)
(B)
(C)
The arrangement that would give correct results is that of student:
1) A
2) B
3) C
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(D)
4) D
6.
SCF-CBSE-IX- PHYSICS-THRUST AND PRESSURE-BMT-01
For performing an experiment to verify Archimedes principle, a student used a spring balance with a
zero error of 4 g wt. He used to measure the weight of a solid metallic block as shown in the figure
below. The solid metallic block was then lowered in water contained in an overflow jar and the water
displaced by this block was collected in graduated or measuring cylinder as shown in figure.
The apparent loss in weight of the solid metallic
block is:
1) 30 g wt
2) 40 g wt
3) 35gwt
4) 38gwt
SECTION-B
VERY SHORT ANSWER QUESTIONS
(1mark)
7.
Which of the two will double the pressure — doubling the area and force or making the area half?
8.
When a floating body is pressed down a little, which of the two will increase — weight or upthrust?
9.
In what direction does the buoyant force on an object immersed in a liquid act?
10.
What is the meaning of the statement, the relative density of gold is19.3?
SECTION-C
SHORT ANSWER QUESTIONS
11.
(2marks)
(a) State Archemedes' principle
(b) Distinguish thrust from pressure
(c) Why is it easier to swim in sea water than in river water.
12.
(a) Name the forces acting on a body when it is fully or partly immersed in a liquid. What is their
magnitude and effect?
(b) Briefly explain why some objects sink but other float when immersed in a liquid.
13.
(a) State the SI units of Thrust and Pressure.
(b) In which situation we exert more pressure on ground when we stand on one foot or one the both
feet. Justify your answer.
14.
Relative density of silver is 10.8.What is the density of silver in S.I unit?
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SCF-CBSE-IX- PHYSICS-THRUST AND PRESSURE-BMT-01
SECTION-D
LONG ANSWER QUESTIONS
15.
(4marks)
What is upthrust? What are the quantities that can vary upthrust? How does it account for the
floating of a body? When a partially immersed body is pressed down a little, what will happen to
the upthrust?
16.
Give reasons for the following:
(i) A ship made of iron floats on water but an iron needle sinks. Explain why?
(ii) Why is it easier to cut an apple with a sharp knife?
*****END OF TEST PAPER*****
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