Which one of the following forces is a contact force?
  • electrostatic force
  • magnetic force
  • force of gravity
  • force of friction
Below figure shows a container filled with water. Which of the following statements is correct about pressure of water?
class8-science-chapter-11-mcq-5.png
  • Pressure at A< Pressure at B < Pressure at C
  • Pressure at A > Pressure at B>Pressure at C
  • Pressure at B> Pressure at C> Pressure at A
  • Pressure at A=Pressure at B=Pressure at C
The S.I unit of Pressure is
  • Bar
  • Kg-wt
  • Pascal
  • Newton
which of the following is incorrect
class8-science-chapter-11-mcq-6.png
  • Pressure difference between A and C is non-zero
  • Pressure difference between A and B is zero
  • Pressure difference between B and C is zero
  • None of these
A sharp knife enable us to cut through things more easily as compare to the blunt knife because
  • The sharp edge can pass through the material slowly
  • The sharp edge is not felt when cutting through the material.
  • The pressure exerted is greater when the same force is used
  • The pressure exerted is lesser when the same force is used
Leaves fall down on the ground because of
  • Magnetic forces
  • Gravitational force
  • electric forces
  • Spring force
1 Kg - wt equals to
  • 1 N
  • 980 N
  • 98 N
  • 9.8 N
Which force of attraction pulls everything to the Earth’s surface?
  • Contact Force
  • Non-contact Force
  • Muscular Force
  • Gravitational Force
At what fraction the gravitational force of the moon is smaller than the Earth’s gravitational force?
  • One-Third
  • One-Fourth
  • One-Fifth
  • One-Sixth
Which substance has magnetic force that is used to capture the iron nails?
  • Magnet
  • Cotton
  • Nitrogen
  • Diesel
Which force of attraction was produced by a ruler to attract pieces of paper?
  • Magnetic force
  • Electrostatic force
  • Muscular force
  • Pressure
What type of charges repel each other?
  • Positive
  • Negative
  • Same charges
  • None of these
Who invented the simple barometer?
  • Galileo Galilei
  • Albert Einstein
  • Isaac Newton
  • Evangelista Torricellli
What is the value of one atm?
  • $1 \times 10^2$ Pa
  • $1.01 \times 10$ Pa
  • $1.013 \times 10^5$ Pa
  • 1 Pa
Which German Scientist performed the experiment “The Magdeburg”?  
  • Aristotle
  • Otto von Guericke
  • Schwann
  • Schleiden
Which instrument is used to measure liquid pressure?
  • Barometer
  • Manometer
  • Seismograph
  • Echocardiogram
A pressure of 20 Pa acts on a smooth surface of an area of 200 cmCalculate the force applied to it.
  • 0.3 N
  • 0.4 N
  • 0.5 N
  • 0.6 N
Calculate the pressure if 100 N force is applied on a smooth surface of an area of 2 m2?
  • 40 Pa
  • 30Pa
  • 50 Pa
  • 60 Pa
Which of the following is an SI unit of force?
  • Pascal
  • Tesla
  • Sigma
  • Newton
Why wooden sleepers are placed below railway tracks?
  • To reduce force
  • To reduce pressure
  • To increase force
  • To increase pressure
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