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Class 8 Science
Force And Pressure
Quiz 3
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Which one of the following forces is a contact force?
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electrostatic force
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magnetic force
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force of gravity
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force of friction
Below figure shows a container filled with water. Which of the following statements is correct about pressure of water?
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Pressure at A< Pressure at B < Pressure at C
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Pressure at A > Pressure at B>Pressure at C
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Pressure at B> Pressure at C> Pressure at A
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Pressure at A=Pressure at B=Pressure at C
The S.I unit of Pressure is
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Bar
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Kg-wt
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Pascal
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Newton
which of the following is incorrect
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Pressure difference between A and C is non-zero
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Pressure difference between A and B is zero
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Pressure difference between B and C is zero
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None of these
A sharp knife enable us to cut through things more easily as compare to the blunt knife because
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The sharp edge can pass through the material slowly
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The sharp edge is not felt when cutting through the material.
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The pressure exerted is greater when the same force is used
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The pressure exerted is lesser when the same force is used
Leaves fall down on the ground because of
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Magnetic forces
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Gravitational force
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electric forces
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Spring force
1 Kg - wt equals to
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1 N
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980 N
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98 N
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9.8 N
Which force of attraction pulls everything to the Earth’s surface?
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Contact Force
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Non-contact Force
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Muscular Force
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Gravitational Force
At what fraction the gravitational force of the moon is smaller than the Earth’s gravitational force?
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One-Third
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One-Fourth
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One-Fifth
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One-Sixth
Which substance has magnetic force that is used to capture the iron nails?
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Magnet
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Cotton
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Nitrogen
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Diesel
Which force of attraction was produced by a ruler to attract pieces of paper?
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Magnetic force
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Electrostatic force
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Muscular force
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Pressure
What type of charges repel each other?
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Positive
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Negative
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Same charges
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None of these
Who invented the simple barometer?
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Galileo Galilei
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Albert Einstein
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Isaac Newton
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Evangelista Torricellli
What is the value of one atm?
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$1 \times 10^2$ Pa
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$1.01 \times 10$ Pa
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$1.013 \times 10^5$ Pa
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1 Pa
Which German Scientist performed the experiment “The Magdeburg”?
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Aristotle
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Otto von Guericke
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Schwann
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Schleiden
Which instrument is used to measure liquid pressure?
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Barometer
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Manometer
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Seismograph
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Echocardiogram
A pressure of 20 Pa acts on a smooth surface of an area of 200 cmCalculate the force applied to it.
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0.3 N
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0.4 N
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0.5 N
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0.6 N
Calculate the pressure if 100 N force is applied on a smooth surface of an area of 2 m2?
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40 Pa
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30Pa
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50 Pa
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60 Pa
Which of the following is an SI unit of force?
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Pascal
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Tesla
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Sigma
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Newton
Why wooden sleepers are placed below railway tracks?
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To reduce force
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To reduce pressure
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To increase force
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To increase pressure
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