🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books

Class 11 Physics (Part Ii) Chapter 11 Mechanical Properties Of Solids Quiz 3 (25 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. A uniform aluminium wire and a uniform steel wire of same length and cross section are attached end to end. The compound wire is hung vertically from one end from a rigid support and a load is suspended at the free end. Y of steel is (20/7) times of aluminium. The ratio of increase of length of steel wire to aluminium wire is (Neglect the weight of wires)

Correct Answer: C) 7:20.

2. A copper ball of radius 'r' travels with a uniform speed 'v' in a viscous fluid. If the ball is changed with anotherball of radius '2r', then new uniform speed will be:-

Correct Answer: C) 4v.

3. What is happening when my ice cream changes from a solid to a liquid?

Correct Answer: B) Melting.

4. A stretched rubber has

Correct Answer: C) Increased potential energy.

5. The length of a wire is doubled by applying some deforming force to it. The value of strain produced in the wire is

Correct Answer: A) 1.

6. The increase in pressure required to decreases the 200 litres volume of a liquid by 0.004% in container is:(Bulk modulus of the liquid = 2100 MPa)

Correct Answer: D) 84 kPa.

7. Identify the SI unit of thermal conductivity.

Correct Answer: A) $\mathrm{W\, m^{-1}\, K^{-1}}$.

8. The ratio of lengths of two rods A and B of same material is 1:2 and the ratio of their radii is 2:1, then the ratio of modulus of rigidity of A and B will be

Correct Answer: D) 1:1.

9. What type of bond is primarily responsible for the hardness of diamond?

Correct Answer: B) Covalent bond.

10. Young's modulus of a wire is Y. what will be its new value if the length and the radius of the wire both are doubled?

Correct Answer: C) Y.

11. A spring fixed at one end elongates by 5 cm, when stretched by a force of 100 N. The work done in producing this elongation is

Correct Answer: C) 2.5J.

12. Ability to stretch and return to the original size

Correct Answer: C) Elasticity.

13. Resistance to scratching.

Correct Answer: B) Hardness.

14. A hole is made in a cotainer filled with water upto height H at height h from the bottom of the cotainer. Velocity of efflux from a hole is given by

Correct Answer: B) $\sqrt[]{2g\left(H-h\right)}$.

15. Strain is defined as .....

Correct Answer: B) Change in dimension per unit original dimension.

16. A fixed volume of iron is drawn into a wire of length L. The extension produced in this wire by a constant force F is proportional to:-

Correct Answer: C) L$^{2}$.

17. Which of the following is a practical example of Hooke's Law in everyday life?

Correct Answer: A) A mattress that compresses when someone lies on it.

18. The limiting force of friction is the .....

Correct Answer: A) Maximum value of static friction.

19. How do shear stress and normal stress influence material behavior under load?

Correct Answer: A) Shear stress can cause deformation along a plane, while normal stress can lead to compression or tension.

20. What are the different types of stress in materials?

Correct Answer: D) Tensile, compressive, shear, bending, and torsional stress.

21. Describe the stress-strain curve and its significance in material science.

Correct Answer: D) It illustrates how materials respond to stress, by the elastic and plastic behavior, yield strength.

22. Poisson's ratio is the ratio of .....

Correct Answer: A) Lateral strain to Linear strain.

23. Hooke's Law states that within elastic limit .....

Correct Answer: A) Stress $\alpha$ strain.

24. Tensile strain is defined as

Correct Answer: B) $\frac{\Delta l}{L}$.

25. For a metal wire, Hooke's Law is valid upto .....

Correct Answer: D) Proportinality limit.

🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books