9th Standard Syllabus & Materials
9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -கற்கண்டு (இலக்கணம்) - தொடர் இலக்கணம், ஆகுபெயர் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -விரிவானம் (துணைப்பாடம்) - தாய்மைக்கு வறட்சி இல்லை! Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -கவிதை பேழை (செய்யுள்) - மார்கழி பெருவிழா Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உயிருக்கு வேர்-இலக்கணம் - பகுபத உறுப்பிலக்கணம் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil அமுதென்று பேர் - இலக்கணம்-எழுத்து -அளபெடை Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil அமுதென்று பேர்-துணைப்பாடம் - ஆறாம்திணை Important Questions And Answers Study Material - QB365 Set A
Published on: 18/10/2019
Fluids
Download Tamil Nadu 9th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
Air gets ____________ as we go down below the sea level like mines
heavier
thinner
greater
lesser
2.
Heavy trucks are fitted with six to eight wheels, As area increases, Pressure will ___________.
decrease
increase
remains the same
3.
In CGS system pressure is measured in ____________.
dyne cm-2
dyne
dyne cm-3
None
4.
In a pressure cooker, the food is cooked faster because
increased pressure lowers the boiling point
increased pressure raises the boiling point
decreased pressure raises the boiling point
increased pressure lowers the melting point
5.
Clouds float in atmosphere because of their low
density
pressure
velocity
mass
6.
The size of an air bubble rising up in water
decreases
increases
remains same
may increase or decrease
7.
_____________ is an experiment, that demonstrates the principle of buoyancy.
8.
A drinking straw works on the existence of _________.
9.
The magnitude of buoyant force acting on an object immersed in a liquid depends on ___________of the liquid.
10.
The instrument used to measure atmospheric pressure is _____________.
11.
In a fluid, buoyant force exists because pressure at the ____________ of an object is greater than the pressure at the top.
12.
Pressure exerted by thrust is directly proportional to area of surface on which it acts.
13.
Hydraulic press is used in the extraction of oil from oil seeds.
14.
Archimede's principle can also be applied to gases.
15.
The foundations of high-rise buildings are kept wide so that they may exert more pressure on the ground
16.
The weight of fluid displaced determines the buoyant force on an object.
17.
What is relative density?
18.
State Pascal’s law.
19.
Why it is easy to swim in river water than in sea water?
20.
Why does a helium balloon float in air?
21.
Scuba divers
22.
Hydraulic Jack
23.
Lactometer
24.
1 gwt
25.
Density
26.
State the laws of flotation.
27.
Explain the construction and working of a hydrometer with diagram.
28.
Assertion: A sleeping mattress is so designed that when you lie on it, a large area of your body comes in its contact.
Reason: This reduces the pressure on the body and sleeping becomes comfortable.
(a) If both assertion and reason are true and reason is the correct explanation of assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of assertion.
(c ) If assertion is true but reason is false.
(d) If assertion is false but reason is true.
29.
Assertion: Pascal’s law is the working principle of a hydraulic lift.
Reason: Pressure is thrust per unit area.
(a) If both assertion and reason are true and reason is the correct explanation of assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of assertion.
(c ) If assertion is true but reason is false.
(d) If assertion is false but reason is true.
30.
The density of water is 1g cm–3. What is its density in S.I. units?
1.
(a)
heavier
2.
(a)
decrease
3.
(a)
dyne cm-2
4.
(b)
increased pressure raises the boiling point
5.
(a)
density
6.
(b)
increases
7.
( )
Cartesian diver
8.
( )
Atmosphere pressure
9.
( )
Density
10.
( )
Barometer
11.
( )
bottom
12.
(b)
13.
(a)
14.
(a)
15.
(b)
16.
(a)
17.
Density of any other substance with respect to the density of water at 4°C is called the relative density.
Relative density (R.D) = \(\frac { Density of the substance} { Density of water at {4}^{o} C }\).
18.
Pascal's Law states that the external pressure applied on an incompressible liquid is transmitted uniformly throughout the liquid.
19.
It is easier to swim in the sea water as compared to river water, Because sea water has dissolved salts in it, which increases the density of water and also increases its upthrust, so the body sink less and we can easily swim in it as compared to the river water, because river water is less dense than sea water.
20.
Helium in the balloon is lighter than the air around it, it receives an upward thrust known as buoyancy. Because helium weighs less than the amount of air it has displaced. So it floats.
21.
Twice the atmospheric pressure
22.
Pascal's Law
23.
Milk
24.
980 dyne
25.
\(\frac { Mass }{ volume }\)
26.
Laws of flotation are:
1. The weight of a floating body in a fluid is equal to the weight of the fluid displaced by the body.
2. The centre of gravity of the floating body and the centre of buoyancy are in the same vertical line.
The point through which the force of buoyancy is supposed to act is known as centre of buoyancy.
27.
Hydrometer is based on the principle of floatation. The weight of the liquid displaced by the immersed portion of the hydrometer is equal to the weight of the hydrometer
1. It is a direct reading instrument used for measuring the density or relative density of the liquid.
2. It consists of a cylindrical stem having a spherical bulb at its lower end, and a narrow tube at its upper end.
3. The lower spherical bulb is partially filled with leadshots or mercury. This helps hydrometer to float or stand vertically in liquids.
4. The narrow tube has marking so that relative density of a liquid can be read directly.
5. The liquid to be tested is poured into the glass jar. The hydrometer is gently lowered into the liquid until it floats freely.
6. The reading against the level of liquid touching the tube gives the relative density of the liquid.
28.
a) Both assertion and reason are true and reason is the correct explanation of assertion.
29.
b) Both assertion and reason are true but reason is not the correct explanation of assertion.
30.
Density of water = 1g cm-3
Density in SI unit = ?
1g = 1000 kg/m3
1 cm3 = 1 x 10-6m3
1 g / cm3 = \(= \frac{10^-3}{10^-6}\)= 1000 kg/m3
In SI unit density of water is 1000 kg/m3.
9th Standard Syllabus & Materials
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
