56. If poisson's ratio equal to 0.4 for the material
cylindrical wire, then find the percentage change
TRX
WX
(4)
3W
RR²x
(3)
TER?
3.
(2) 14 kg
(4) 12 kg
to of 0.5. If a uniform rod
a longitudinal strain of
e in volume of the rod is
(2) 20%
90%
volume of the same wire in which longitudinale
is 2x103 on applying tensile stress,
(1) 0.04%
(3) 0.02%
(2) 0.08%
(4) 4%
4.
acceleration 19.6 mly in horizontal direc
the amount of water split out is
(1) 250 kg
(2) 500 kg
(3) 750 kg
(4) 900 kg
8 identical drops of the same radius 2
through air with steady velocity 5 omis,
drops coalesco the terminal velocity wou
(1) 10 m/s
(2) 0.1 m/s
(3) 20 cm/s
(4) 40 cm/s
Bernoulli's principle is based on
(1) Conservation of mass
(2) Conservation of Energy
(3) Conservation of momentum
(4) Conservation of Volume
An open U-tube contains mercury. W
of water is poured into one of the arms
how high does the mercury rise in th
from its initial level ? (Density of
13.6 g/cm)
(1) 0.56 cm
(2) 1.35
modulus Y, coefficient of
rea of cross-section A is
agnitude of temperature
te the thermal stress
length is L and it is free
zontal surface,
(2) YAOAT
57. Two rods A and B of radii in ratio 1:2 and for
ratio 2 : 5, are placed between rigid supports
no scope for expansion. The material of both
is same. Now if both the rods are heated
produce the same temperature rise, then ther.
of thermal stress developed in A and B is
5.
(1) 1:1
(2) 1:2
(4) Zero
(3) 1:4
(4) 1:8
58. Calculate the maximum length of a uniform
which can be hanged from ceiling, padensity
material of wire, g-acceleration due to gravity
o=breaking stress for the material of wire.
6.
(3) 0.41 cm
(4) 2.32
A closed compartment containging
with some acceleration in horizont
Stress
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Answer:
57----- The lengths and radii of two rods made of same material are in the ratios 1 : 2 and 2 : 3 respectively ; If the temperature difference between the ends for the two rods be the same, then in the steady state, the amount of heat flowing per second through them will be in the ratio:
Medium
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Answer
Correct option is
C
8 : 9
Q=
d
kAδ(T)
Q
2
Q
1
=
kπ3x
2
δ(T)y
kπ2x
2
δ(T)2y
Q
2
Q
1
=
9
8
58--------------
If ρ is the density of the material of a wire and σ is the breaking stress, the greatest length of the wire that can hang freely without breaking is?
Easy
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Answer
Correct option is
A
σ/ρg
Stress = weight/area
=Alρg/A=lρg⇒σ=lρg
∴l=σ/ρg
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