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Physics For Class IX (Science Group)
UNIT 5: FORCES AND MATTER
Multiple Choice Questions (MCQs) , Fill in the blanks and Concept Map
Section (A) Multiple Choice Questions (MCQs)
Tick mark (✓) the correct answer:
1. The springs in brakes and clutches are used:
a) To restore original position ✓
b) To measure forces
c) To absorb shocks
d) To absorb strain energy
2. If the material recovers the original dimensions, when an external force is removed, this deformation is known as ______ deformation.
a) Inelastic
b) Permanent
c) Elastic ✓
d) Irreversible
3. Which of the following material is more elastic?
a) Rubber
b) Glass
c) Steel ✓
d) Wood
4. If a spring stretches easily then its spring constant has _____.
a) Large value
b) Small value ✓
c) Constant Value
d) Both (a) and (b)
5. What is the unit for the spring constant?
a) Nm
b) Nm-2
c) Nm-1 ✓
d) Nm2
6. The spring obeys Hooke's law for the earlier extensions and when the spring becomes damaged it does not appear to do so; Fig 5.12. Estimate, from graph, after addition of which weight the spring damaged.
a) 1.5 N
b) 8 N
c) 1.6 N ✓
d) 2.0 N
7. Which of the following is not a unit of pressure?
a) Pascal
b) Bar
c) Atmosphere
d) Newton ✓
8. If a metal block applies a force of 20 N on an area of 5 cm2. Find the pressure being applied by the block on the area of ____.
a) 100 Ncm-2
b) 0.8 Ncm-2
c) 0.25 Ncm-2
d) 4 Ncm-2 ✓
9. The Fig 5.13 shows a container with three spouts. The container is filled with water. Jets of water pour out of the spouts. Why does the jet of water from the bottom spout goes farthest out from the container?
a) Pressure decreases with depth.
b) Pressure increases with depth. ✓
c) More water available to flow out from the bottom.
d) Density of water different at different places.
10. When a force is exerted on an area, this is known as:
a) torque
b) pressure ✓
c) energy
d) equilibrium
11. Pressure = ___ :
a) torque / area
b) area / torque
c) area / force
d) force / area ✓
12. The length of spring increases as the force increases. This increase in length of spring is known as:
a) extension ✓
b) stretch
c) elasticity
d) expansion
13. Within elastic limit, the displacement produced in the spring is directly proportional to the:
a) increase in length
b) extension produced
c) force applied ✓
d) None of these
14. The equation for Hooke's law may by written as:
a) x = kF
b) F = kx ✓
c) x = k/F
d) F = k/x
15. 1 atmosphere = ___ :
a) 1.013 x 105 Pascal ✓
b) 1.013 x 105 Bar
c) 1.013 x 105 Newton
d) 1.013 x 105 Nm-1
16. In SI system, unit of pressure is:
a) Nm
b) Nm-2 ✓
c) Nm-1
d) Nm2
17. 1 Pascal (Pa) = _____ :
a) 1.013 x 105 Nm-2
b) 1.013 Nm-2
c) 10 Nm-2
d) 1 Nm--2 ✓
18. It is a collection of molecules that are randomly arranged and held together by weak cohesive forces and by forces exerted by the walls of a container.
a) A liquid
b) A gas
c) Both 'a' & 'b' ✓
d) None of them
19. The pressure exerted by fluids acts in:
a) one direction
b) two directions
c) up & down directions
d) all directions ✓
20. Pressure of a fluid P is proportional to the:
a) depth ✓
b) mass
c) force
d) None of them
21. It tells us how tightly matter is packed together.
a) Mass
b) Weight
c) Density ✓
d) Volume
22. The machines in which force is transmitted by liquids under pressure is known as:
a) liquid machines
b) fluid machines
c) pneumatic machines
d) hydraulic machine ✓
23. A hydraulic machine works on:
a) Newton's third law of motion
b) Newton's law of gravitation
c) Pascal's law ✓
d) Molecular theory
24. Forces on an object can cause:
a) tensile deformation (stretching)
b) compressive deformation (squashing)
c) Both 'a' & 'b' ✓
d) None of these
25. Pressure is greater when a large force acts on:
a) large area
b) small area ✓
c) cylindrical area
d) round area
26. The pressure in a fluid is greater with:
a) large depth and high density ✓
b) large depth and low density
c) the small depth and high density
d) small depth and low density
Fill In Blanks:
1. Forces on an object can cause tensile deformation (stretching) and compressive deformation (squashing).2. An elastic change occurs when an object returns to its original shape and size after the load is removed.
3. An extension against load graph shows a body stretches when a load is applied to it.
4. Hooke’s Law states that "The extension in spring is proportional to the load applied to it, provided the limit of elasticity is not exceeded.
5. According to Hooke's law, F = kx
6. An extension against load graph is a straight line up to the limit of proportionality.
7. Pressure is greater when a large force acts on small area.
8. The pressure in a fluid is greater with large depth, and high density.
9. Pressure = depth x density x acceleration due to gravity.
10. P = dρg
11. Liquids transmit pressure equally in all directions. This is called Pascal’s law.
12. The machine in which force is transmitted by liquids under pressure is known as hydraulic machine.
13. Pressure = Force /Area
CONCEPT MAP
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