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Forces and Pressure. Science - Forces and Pressure.

Tamil Nadu Board - STD 8 - Science (Tamil - English Medium). 111 questions in this chapter.

Question types

Forces and Pressure. question types

111 questions across 9 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

111
Questions
9
Question groups
5
Question types
Sample Questions

Forces and Pressure. questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 2M C Q1 Mark
The atmospheric pressure on the surface of the earth is about ………………
  • A
    $10<$ sup $-5 Nm ^2$
  • B
    $10^4 Nm ^2$
  • ✓
    $10^5 Nm ^2$
  • D
    $10^3 Nm ^2$

Answer: C.

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Q 3M C Q1 Mark
The total force exerted by a body normal to the surface is called
  • A
    Pressure
  • ✓
    Thrust
  • C
    force of gravity
  • D
    None of these

Answer: B.

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Q 4M C Q1 Mark
Which of the following increases friction?
  • A
    Lubricant
  • ✓
    Treads on a tyre
  • C
    Streamlining
  • D
    Polishing

Answer: B.

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Q 5M C Q1 Mark
The wear and tear in the machine part is due to
  • A
    Electrostatic force
  • ✓
    Frictional force
  • C
    Muscular force
  • D
    Gravitational force

Answer: B.

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Q 16Assertion & Reason1 Mark
Assertion : There is danger of a vehicle skidding on a wet road.
Reason : The tyres of the vehicle lose their grip on the road due to increase in friction due to presence of water on the road.
  • A
    Both assertion and reason are true and the reason is the correct explanation of the assertion.
  • B
    Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
  • ✓
    The assertion is true, but the reason is false.
  • D
    The assertion is false, but the reason is true.

Answer: C.

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Q 17Assertion & Reason1 Mark
Assertion : We can live very happily if friction is not present in nature.
Reason : Aeroplane shape is streamlined to reduce the effort of frictional force.
  • A
    Both assertion and reason are true and the reason is the correct explanation of the assertion.
  • B
    Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
  • C
    The assertion is true, but the reason is false.
  • ✓
    The assertion is false, but the reason is true.

Answer: D.

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Q 18Assertion & Reason1 Mark
Assertion : The pressure at the bottom of the sea is lesser than that near the surface.
Reason : The pressure exerted by a liquid depends upon the depth of the liquid and density of the liquid.
  • A
    Both assertion and reason are true and the reason is the correct explanation of the assertion.
  • B
    Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
  • C
    The assertion is true, but the reason is false.
  • ✓
    The assertion is false, but the reason is true.

Answer: D.

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Q 19Assertion & Reason1 Mark
Assertion : Friction always opposes the motion.
Reason : Whenever one surface moves or tries to move over another surface, the force of friction starts acting on the surfaces.
  • A
    Both assertion and reason are true and the reason is the correct explanation of the assertion.
  • B
    Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
  • C
    The assertion is true, but the reason is false.
  • ✓
    The assertion is false, but the reason is true.

Answer: D.

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Q 20Assertion & Reason1 Mark
Assertion : Force is defined as a push or pull acting on a body.
Reason : CGS unit of force is newton.
  • A
    Both assertion and reason are true and the reason is the correct explanation of the assertion.
  • B
    Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
  • ✓
    The assertion is true, but the reason is false.
  • D
    The assertion is false, but the reason is true.

Answer: C.

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Q 31Match The Following.4 Marks
Column - IColumn - II
iFriction(a)Measuring force
iiSpring balance(b)Reduce friction
iiiShape of aeroplane(c)Nature of surface
ivLubricants(d)Drag
vFluid friction(e)Bird
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Q 32Match The Following.4 Marks
Column - IColumn - II
iFriction produces(a)Ceiling fan
iiLubricants(b)Heat
iiiSoapy floor(c)Oil and grease
ivBall bearing(d)Rolling friction
vWheels(e)Less the friction
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Q 33Match The Following.4 Marks
Match the following.
Barometer reduce friction
Increasing area of contact Atmospheric pressure
Decreasing area of contact cause of friction
Lubricants increases friction
Irregular surface decreases friction
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Q 34Match The Following.4 Marks
Match the following.
Column I Column II
a) Static friction Viscosity
b) Kinetic friction Least friction
c) Rolling friction Objects are in motion
d) Friction between the liquid layers Objects are sliding
e) Sliding friction Objects are at rest
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Q 40[7 marks Questions]7 Marks
Cross word puzzle :
Across:
1. The mixture of gases that surrounds the Earth or some other celestial body.
3. A force acting normal to a surface.
5. The pressure exerted by air.
7. Something that causes a body to move, change its speed or direction, or distorts its shape.
9. The upward force that fluids exert on all matter.Down:
2. A unit used to measure pressure.
4. A unit used to measure force.
6. Amount of force applied per unit area.
8. An instrument for measuring atmospheric pressure.
10. The pressure exerted at any point on a enclosed liquid is transmitted equally and undiminished in all directions.
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