Chapter – 9: Mechanical Properties of Solids

MCQ Practice Question of Physics Part-I, Chapter – 9: Mechanical Properties of Solids

1. The fractional change in volume per unit increase in the pressure is called
   (a) Volume coefficient
   (b) Pressure gradient
   (c) Compressibility
   (d) Bulk modulus
2. A steel wire is loaded by 2 kg weight. If the radius of the wire is doubled, then its extension will become (a) half (b) four times (c) one-fourth (d) double
3. The graph between the Stress and the Strain of a wire within elastic limit is a (a) straight line with zero slope (b) straight line with positive slope (c) straight line with negative slope (d) all of the above
4. Which of the following group of quantities having same dimensions (a) Stress, Strain & Young Modulus (b) Stress, Young Modulus & Pressure (c) Stress, Pressure & Force (d) Young Modulus, Stress & Energy
5. Which of the following has no dimensions ?

(a) strain

(b) angular velocity

(c) momentum

(d) angular momentum

6. Which of the following material have maximum elasticity (a) CO₂ (b) Water (c) O₂ (d) Iron

7. The breaking stress for wire of unit area of cross-section is called its:
(a) Young’s modulus
(b) tensile strength
(c) yield point
(d) elastic limit

8. If both the length and radius of the wire are doubled, then how does the modulus of elasticity change?
(a) doubled
(b) halved
(c) becomes one fourth
(d) remains unchanged

9. For obtaining appreciable extension, the wire must be
(a) short and thin
(b) long and thick
(c) long and thin
(d) short and thick

10. The Young’s modulus of air is
(a) zero
(b) infinity
(c) more han 1 but not infinity
(d) less than 1 but not zero