## Lakshya Education MCQs

Question: The bulk modulus for an incompressible liquid is
Options:
 A. zero B. unity C. infinity D. between 0 and 1
: C

The bulk modulus is
K=pvv
If liquid is incompressible so V=0
Hence, K=pv0
=infinity

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## More Questions on This Topic :

Question 1. The Young's modulus of a rubber string 8 cm long and density  1.5 kgm3 is 5 ×108Nm2. It is suspended from the ceiling in a room. The increase in length due to its own weight will be
1.    9.6× 10−5 m
2.    9.6× 10−11m
3.    9.6× 10−3m
4.    9.6 m
: B

b):l = L2dg2Y = (8×102)2×1.5×9.82×5×108 = 9.6×1011m
Question 2. The coefficient of linear expansion of brass and steel are

α1 and α2. If we take a brass rod of length l1 and steel rod of length  l2 at 0C, their difference in length  (l2l1)will remain the same at a temperature if
1.    α1l2=α2l1
2.    α1l22=α2l21
3.    α21l1=α22l2
4.    α1l1=α2l2
: D

d)L2=l2(l+α2θ) and L1=l1(l+α1θ)
(L2L1)=(l2l1)+θ(l2α2l1α1)
Now (L2L1)=(l2l1) so, l2α2l1α1=0
Question 3. When a rod is heated but prevented from expanding, the stress developed is independent of
1.    material of the rod
2.    rise in temperature
3.    length of rod
4.    none of these