Page 2 - HA CH 11 CLASS XI

9. The bulk modulus of a fluid is inversely proportional to the
(a) Change in pressure(b) Volume of the fluid
(c) Density of the fluid (d) Change in its volume

10. If the work done in stretching a wire by 1 mm is 2 J, the work necessary for stretching another wire
of the same material but with double the radius of cross-section and half the length by 1 mm is in
joules (EAMCET 91)
(a) 16 (b) 8

(c) 4 (d)

5
2
11. To compress a liquid by 10% of its original volume, the pressure required is 2 × 10 N/m . the bulk
modulus of the liquid is
4 2 5 2
(a) 2 × 10 N/m (b) 2 × 10 N/m
7 2 6 2
(c) 2 × 10 N/m (d) 2 × 10 N/m

12. A wire of length L, radius r, when stretched with a force F, changes in length l. what will be the
change in length in a wire of same material having length 2 L, radius 2 r and stretched by a force of
2 F (MPPMT 80, 96)

(a) (b) 2l
(c) 3l (d) 4l

13. In a wire, when the elongation is 2 cm, the energy stored is E. if the wire is stretched by 10 cm, then
the energy stored in the wire will be
(a) E (b) 5E

(c) 25E (d)

14. A stretched wire has a Young’s modulus Y and energy density E. the strain in the stretched wire is

(a) (b)

(c) (d)

15. The upper end of wire 1 m long and 2 mm radius is clamped. The lower end is twisted through an
angle of 45°. The angle of shear is
(NCERT 90 PMT MP 90, 96)
(a) 0.09° (b) 0.9°
(c) 9° (d) 90°

16. Which of the following is correct statement from the given graph plotted, for four wires of same
material and same thickness (MHT-CET-2001)