(a) (YxA)/(2L) (b) (Yx2 A)/(L) (c) (Yx2 A)/(2L) …
21. When a 4 kg mass is hung vertically on a light spring that obeys Hooke’s law, the spring stretches by 2 cms. The work required to be done by an external agent in stretching this spring by 5 cms …
(a) Fl/2AL (b) FA/2L (c) FL/2A …
16.The length of a rod is 20 cm and area of cross-section 2 cm2 . The Young’s modulus of the material of wire is 1.4×1011 N/m2 . If the rod is compressed by 5 kg-wt along its length, then increase …
(a) 3 : 2 (b) 2 : 3 (c) 3 : 4 (d) 4 : 3 Answer-a (23)
(a) √(2E)/Y (b) √(2E) (c) EY …
(a) 0.01 J (b) 0.02 J (c) 0.04 J (d) 1.00 J Answer-a (37)
10. A brass rod of cross-sectional area 1cm2 and length 0.2 m is compressed lengthwise by a weight of 5 kg. If Young’s modulus of elasticity of brass is 1×1011 N/m2 and g=10 m/sec2 , then increase in the energy of …
(a) Converts into kinetic energy (b) Converts into heat energy (c) Remains as potential energy (d) None of the above Answer-b (9)
(a) Remains constant (b) Decreases (c) Increases (d) None of the above Answer-c (13)
(a) It will break (b) Its temperature will reduce (c) There will be no change in its temperature (d) Its temperature increases Answer-d (12)
(a) Kl/2 (b) Kl (c) Kl2 /2 …
(a) Zero (b) 0.05 joule (c) 100 joule (d) 500 joule Answer-b (16)
(a) 1 : 2 (b) 1 : 4 (c) 2 : 1 (d) 1 : 1 Answer-a (19)
(a) Mgl (b) Zero (c) Mgl/2 …
(a) Stress × Strain (b) (1/2)(Stress× Strain) (c) 2× Stress × Strain (d) Stress/Strain Answer-b (8)
(a) V/25 (b) 5V (c) V/5 (d) 25V Answer-d (4)
(a) Shape (b) Size (c) None (d) Shape and size Answer-d (60)
(a) Volume stress (b) Shearing strain (c) Longitudinal strain (d) Metallic strain Answer-b (7)
(a) 2.4 (b) 1.2 (c) 0.4 (d) 0.2 Answer-d (17)
(a) Non zero constant (b) Infinite (c) Zero (d) Can not be predicted Answer-c (18)
(a) Zero (b) Infinity (c) 2×1010 N/m2 (d) 3×1010 N/m2 Answer-b (10)
(a) r1 2 /r2 2 (b) r2 2 /r1 2 (c) r2 4 /r1 4 …
The Young’s modulus of the material of a wire is 6×1012 N/m2 and there is no transverse strain in it, then its modulus of rigidity will be (a) 3×1012 N/m2 (b) 2×1012 N/m2 (c) 1012 N/m2 …
(a) Shearing (b) Longitudinal (c) Volume (d) Transverse Answer-a (5)
(a) 3Y=K(1-σ) (b) K=(9ηY)/(Y+η) (c) σ=(6K+η)Y (d) σ=(0.5Y-η)/η …
(a) 4 : 1 (b) 16 : 1 (c) 8 : 1 (d) 1 : 1 Answer-d (45)
(a) Too less (b) Greater than all matters (c) Less than all matters (d) Zero Answer-b (9)
19. The pressure applied from all directions on a cube is P. How much its temperature should be raised to maintain the original volume ? The volume elasticity of the cube is β and the coefficient of volume expansion is …
21. For a constant hydraulic stress on an object, the fractional change in the object’s volume (ΔV/V) and its bulk modulus (B) are related as (a) (ΔV/V) ∝ B (b) (ΔV/V) ∝ 1/B (c) …
20. The pressure of a medium is changed from 1.01 × 105 Pa to 1.165 × 105 Pa and change in volume is 10% keeping temperature constant. The Bulk modulus of the medium is (a) 204.8 ×105 Pa (b) …
(a) Young’s modulus (b) Coefficient of volume elasticity (c) Modulus of rigidity (d) Poisson’s ratio Answer-b (11)
(a) Zero (b) Unity (c) Infinity (d) Between 0 to 1 Answer-c (16)
(a) Is equal to its volume V (b) Is equal to p/2 (c) Is equal to its pressure p (d) Can not be determined Answer-c (25)