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Class 11 Physics (Part Ii) Chapter 11 Mechanical Properties Of Solids Quiz 5 (25 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. State true or false:Strain has no unit and dimension.

Correct Answer: A) True.

2. Out of steel and rubber, which is more elastic

Correct Answer: A) Steel.

3. Bulk modulus is defined as

Correct Answer: A) The ratio of volumetric stress to volumetric strain.

4. How many significant figures are in the number 0.1470?

Correct Answer: A) 4.

5. The dimensions of stress are .....

Correct Answer: A) $\left[L^{-1}M^1T^{-2}\right]$.

6. The Young's modulus of most solids

Correct Answer: A) Decrease with increase in temperature.

7. The property which resist the relative motion between two surface in contact is called

Correct Answer: A) Friction.

8. There are two identical wires with Young's moduli Y1 and Y2 respectively such that Y1> Y2. If they are hung from a rigid support and same weight is applied to them at their free ends then

Correct Answer: D) Elongation in the second wire will be more.

9. When two surfaces in contact become more smooth, the area of contact between the surfaces .....

Correct Answer: C) Increases.

10. Identify the correct expression for the coefficient of linear expansion $\alpha$

Correct Answer: A) $\alpha=\dfrac{\Delta L}{L_0\, \Delta T}$.

11. Four uniform wires described below are made of the same material. The wire which will have the largest extension, for a given tension is

Correct Answer: A) L = 50 cm, diameter = 0.5 mm.

12. How many significant figures are in the number 65.7?

Correct Answer: A) 3.

13. Acceleration due to gravity at the surface of earth is given by

Correct Answer: D) $g=\\frac{GM}{r^2}$.

14. Milk takes the shape of its container because it is a:

Correct Answer: B) Liquid.

15. Airfoil wing design is an example of applying

Correct Answer: A) Bernoulli's Principle.

16. An example of elastomer is

Correct Answer: C) Rubber.

17. What is the main reason metals are good conductors of electricity?

Correct Answer: A) They have free electrons.

18. Toughness is the ability to absorb energy and:

Correct Answer: B) Resist fracture or breaking.

19. Ability to be pounded into thin sheets.

Correct Answer: C) Malleability.

20. What does the spring constant (k) represent in Hooke's Law, and how does it affect the behavior of a spring?

Correct Answer: A) The spring constant (k) represents the stiffness of the spring; a higher k value indicates a stiffer spring.

21. What is the formula for calculating Young's Modulus?

Correct Answer: C) E = stress / strain.

22. A uniform metallic wire is stretched by suspending a weight from it. If $\alpha$

Correct Answer: B) $\frac{Y\alpha^2}{2}$.

23. ..... is the ability of a material to resist fracturing, when a force is applied to it

Correct Answer: D) Toughness.

24. The lower surface of a cube is fixed. On its upper surface, force is applied at an angle of 30$^\circ$ from its surface. The change will be in its

Correct Answer: D) Both shape and size.

25. The depth at which acceleration due to gravity(g) is half of that at the surface of earth is

Correct Answer: A) $\frac{R}{2}$.

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