Question

2
127. A structural steel rod has a radius of 20 mm and a length of 2.0 m If a 10KN force stretches it along its length then stress produced in it is
ncarly
A) 3 x 10* Nm
B) 3 x 10'Nm-?) x 10 Nm D) 8 x 10°Nm-2
128. A steel wire of length 4 mand cross-section area 2 x 10-5 in? stretches by the same amount as a copper wire of length 2.5 mn and cross-
section arca of 4 x 10"inunder a given load. The ratio of Young's modulus of steel to that of copper is
A) 1.2 B) 1.8 C) 2.5 D) 3.2
129
AV
The average depth of an ocean is about 2200 m, if the bulk modulus of water is 2.2 x 10'Nin then the fractional compression V of
water is
D) 6 x L3
A) 0.2 B) 0,02 C) 0.1 D) 0.01
130 Which of the following substances has the highest elasticity?
A) Aluminium B) Brass C) Copper D) Steel
131. In case of bending of a beam, depression depends on length of beam (L) as
δα
B) O O L?
δα
A)
L
C)
132
A steel cable with a radius of 1 cm supports a chairlift at a ski arca. If the maximum stress is not to exceed 10' N/m- the maximum load, the
cable can support is
A) 7 x 10-'N B) 6.28 x 10' N C) 3.14 x 104 N D) 31.4 x 10' N
133 A glass slab is subjected to a hydraulic pressure of 5 atm, the fractional change in volume of glass slab is (Bulk modulus for glass = 37CP
A) 3.12 x 10-8 B) 1.35 x 10-5C) 2.21 x 10-5 D) 5.25 x 10-7
134 A solid copper cube of an edge 20 cm is subjected to a hydraulic pressure of 14 x 10° Pa If Bulk modulus for copper is 140CP4, then the
change in volume of the cube is
A) 8 x 10-7 m
m B) 5 x 10-7 m) 5 x 10-* m D) 6 x 10- in
135. The change in the pressure on a litre of water to compress it by 0.5% is (Bulk modulus of water = 2.2GPa)
A) 11 x 10 Pa B) 2.2 x 10° Pa C) 22 x 10 Pa D) 20 x 10 Pa​

Answer 1

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