Mechanical Properties of Matter

Physics, SSC-Punjab Class 9. This chapter is split into 39 topics and has 917 practice questions. The topics covered are listed below, followed by 10 free sample questions from the chapter.

Topics in this chapter

1. Exercise 6B short answer questions 23 questions
2. Barometer numericals 22 questions
3. Units of density and density table 26 questions
4. Deformation of solids 22 questions
5. Activity 6.1 and Quick Quiz on springs 21 questions
6. Measurement of density 24 questions
7. Exercise 6E numerical problems 22 questions
8. Springs in series and parallel 24 questions
9. Atmospheric pressure numericals 28 questions
10. Units of pressure and conversions 23 questions
11. Applications of Hooke's law 23 questions
12. Evidence and variation of atmospheric pressure with height 23 questions
13. Extension of stretched wires 20 questions
14. Typical pressures table 23 questions
15. Liquid pressure numericals 25 questions
16. Density numericals 28 questions
17. Atmospheric pressure and weather 24 questions
18. Hydraulic brakes and other hydraulic systems 23 questions
19. Exercise 6C constructed response questions 23 questions
20. Hydraulic press: principle and force multiplier 23 questions
21. Elasticity and elastic limit 21 questions
22. Pressure numericals 30 questions
23. Force-extension graph 22 questions
24. Hydraulic press numericals 24 questions
25. Exercise 6A multiple choice questions 23 questions
26. Measurement of pressure by manometer 22 questions
27. Atmospheric pressure: concept 23 questions
28. Mercury barometer 24 questions
29. Density: concept and definition 23 questions
30. Exercise 6D comprehensive questions 21 questions
31. Pressure: concept and definition 24 questions
32. Hooke's law numericals 27 questions
33. Hooke's law 23 questions
34. Pascal's law 23 questions
35. Pressure in daily life 23 questions
36. Pressure in liquids 24 questions
37. Spring constant 24 questions
38. Key points and learning outcomes of Chapter 6 24 questions
39. Activities 6.3 to 6.6 on liquid pressure 22 questions

Sample questions: Mechanical Properties of Matter

10 sample questions with the correct answer and an explanation. Try to answer each one before reading the explanation.

Q1. Why do equal volumes of different substances have different masses?

• A. They have different colours
• B. They have different temperatures only
• C. The molecules of different substances are different in size and mass, and their inter-molecular spacing is different(correct answer)
• D. Gravity acts differently

Answer: C.As explained on p. 131. The correct answer is: The molecules of different substances are different in size and mass, and their inter-molecular spacing is different.

Q2. Sports boots for football and hockey have studs on their soles because they:

• A. reduce the area in contact with the ground, increasing the pressure so the feet grip the surface more firmly(correct answer)
• B. increase friction by making the boot heavy
• C. reduce the pressure
• D. increase the contact area

Answer: A.The FYI box states this. The correct answer is: reduce the area in contact with the ground, increasing the pressure so the feet grip the surface more firmly.

Q3. We do not feel the enormous atmospheric pressure because:

• A. the atmosphere is hot
• B. we are too small
• C. practically all bodies have air inside them, and the atmospheric pressure acting in all directions balances the pressure inside(correct answer)
• D. air is weightless

Answer: C.As explained on p. 136. The correct answer is: practically all bodies have air inside them, and the atmospheric pressure acting in all directions balances the pressure inside.

Q4. Can we use water in place of mercury to construct a barometer (Quick Quiz)? In principle yes, but:

• A. water would boil immediately
• B. the water column would be more than 10 m high, so the instrument would be impractical(correct answer)
• C. water has a larger density than mercury
• D. water cannot hold pressure

Answer: B.The height would be about 10.3 m. The correct answer is: the water column would be more than 10 m high, so the instrument would be impractical.

Q5. The basic principle used to measure atmospheric pressure by a simple mercury barometer is that:

• A. mercury is cold
• B. mercury is silver
• C. mercury is a gas
• D. the pressure at the same level in a liquid is the same, so the pressure at the base of the mercury column equals the atmospheric pressure(correct answer)

Answer: D.Short Answer 6.9. The correct answer is: the pressure at the same level in a liquid is the same, so the pressure at the base of the mercury column equals the atmospheric pressure.

Q6. Which learning outcome is about Pascal's law?

• A. Define density
• B. Define and apply Pascal's law to systems such as the transmission of pressure in hydraulic systems like the hydraulic press and brakes(correct answer)
• C. Describe a manometer
• D. Use Hooke's law

Answer: B.It is listed in the outcomes. The correct answer is: Define and apply Pascal's law to systems such as the transmission of pressure in hydraulic systems like the hydraulic press and brakes.

Q7. In Exercise 6.5, option (d) is correct because Pascal's law says the pressure is:

From your book: Exercise 6.5 (page 143) Full page Open book

• A. increased at the bottom only
• B. transmitted undiminished to every part of the enclosed fluid and the walls of the vessel(correct answer)
• C. absorbed by the fluid
• D. reduced at the walls

Answer: B.That is the statement of the law. The correct answer is: transmitted undiminished to every part of the enclosed fluid and the walls of the vessel.

Q8. Exercise 6.7 answer 'potential' agrees with which statement from Chapter 5?

From your book: Exercise 6.7 (page 143) Full page Open book

• A. Kinetic energy is energy of position
• B. Chemical energy is stored in springs
• C. The potential energy stored in a compressed or stretched spring is called elastic potential energy(correct answer)
• D. Energy of a spring is heat

Answer: C.Chapter 5 Key Points. The correct answer is: The potential energy stored in a compressed or stretched spring is called elastic potential energy.

Q9. Short Answer 6.5: By elasticity of a solid we mean:

• A. its density
• B. its ability to flow
• C. the property of a solid by which it regains its original size and shape after the deforming force is removed(correct answer)
• D. its temperature

Answer: C.As defined in section 6.1. The correct answer is: the property of a solid by which it regains its original size and shape after the deforming force is removed.

Q10. Which Key Point connects mercury with atmospheric pressure?

• A. Density is mass per unit volume
• B. Atmospheric pressure is measured by the column of mercury which the atmospheric pressure can support(correct answer)
• C. Elasticity is a property of solids
• D. Pressure is force per unit area

Answer: B.Key Points of Chapter 6. The correct answer is: Atmospheric pressure is measured by the column of mercury which the atmospheric pressure can support.