Q.1
The poisson ratio can not have the value [ EAMCET 1989]
  • a) 0.7
  • b) 0.2
  • c)0.1
  • d)0.5
Q.2
Streamline flow is more likely for liquids with
  • a) High density an low viscosity
  • b) Low density and high viscosity
  • c)High density and high viscosity
  • d)Low density and low viscosity
Q.3
Two cylinder A and B are made of the same material. the length and radii of the two cylinder are in the ratio of 1 :Both are twisted by the same external torque. the ratio of the angle of twist of A and B is
  • a) 1: 2
  • b) 1 : 4
  • c)1 : 8
  • d)8 : 1
Q.4
Two cylinder A and B of the same material have same length, the radii of A and B are in the ratio of 1:The two are joined end to end as shown in figure. The upper end of A is rigidly fixed. The lower end of B is twisted through an angle θ, the angle of twist of cylinder A is
ch-8_que_no-100_img_no1.png
  • a) θ
  • b) (15/16) θ
  • c) (16/17)θ
  • d) (17/16) θ
Q.5
In steel the Young's modulus and strain at the breaking point are 2×1011Nm-2 and 0.15 respectively. The stress at the break point for steel is therefore [ MPPET 1990]
  • a)1.33 × 1011Nm-2
  • b) 1.33×1012Nm-2
  • c)7.5×10⁻³ Nm-2
  • d)3×1010Nm-2
Q.6
Which of the following statement is correct? [ MPPET 1992]
  • a) Hook's law is applicable only within elastic limit
  • b) The adiabatic and isothermal elastic constant of gas are equal
  • c)Young's modulus is dimensionless
  • d)Stress multiplied by strain is equal to the stored energy
Q.7
The force required to stretch a steel wire of 1cm2 cross-section to 1.1 times its length would be ( Y=2×1011 Nm-2) MPPER 1992]
  • a) 2×106 N
  • b) 2×103 N
  • c)2×10⁻⁶
  • d)2×10⁻⁷ N
Q.8
Which of the following substance possesses the highest elasticity [ MPPMT 1992]
  • a) Rubber
  • b) Glass
  • c) Steel
  • d) Copper
Q.9
Which of the following quantities does not have the unit of force per unit area [ MPPMT]
  • a)Stress
  • b) Strain
  • c)Young's modulus of elasticity
  • d)Pressure
Q.10
A rod of length l and radius is joined to a rod of length l/2 and radius r/2 of same material. The free end of small rod is fixed to rigid base and the free end of larger rod is given a twist of θ°, the twist angle at the joint will be
  • a) θ/4
  • b) θ/2
  • c)(5/6) θ
  • d)(8/9) θ
Q.11
As steel wire has length 2.0 m, radius 1.0 mm and Y=20×1010 N/mA sphere of mass 10 kg is attached to one end of the wire ,which is then whirled in a vertical circle with an angular velocity of 2 revolutions per sec. The elongation of wire when the mass is at lowest point of the path is nearly [ AMU 1995]
  • a)1.0 mm
  • b) 2.0 mm
  • c)0.1 mm
  • d)0.01 mm
Q.12
Two wires of the same material have lengths in ratio 1:2 and their radii are in the ratio 1 :√If they are stretched by applying equal force, the increase in their lengths will be in the ratio.. [ MPPMT 1994]
  • a) 2 : √2
  • b) √2 : 2
  • c) 1 : 1
  • d) 1 : 2
Q.13
A uniform cube is subjected to volume compression. If each side is increased by 1% then bulk strain is .. [ EAMCET 1995]
  • a)0.01
  • b) 0.06
  • c)0.02
  • d)0.03
Q.14
A cylinder tree has a breaking stress of 106 N/mThe density of the tree is 2×104 kg/mThe maximum possible height of the tree is then [ CET 1994]
  • a) 25 m
  • b) 150 m
  • c)5.0 m
  • d)100 m
Q.15
A force of 103 N stretches the length of a hanging wire by 1 millimeter. The force required to stretch a wire of same material and length but having four times the diameter by 1 millimetre is [ PMT 1995]
  • a) 4×103 N
  • b) 16×103 N
  • c)(1/4)×103 N
  • d)(1/16)×103 N
Q.16
When a weight of 10 kg is suspended from a copper wire of length 3 metres and diameter 0.4 mm, it length increases by 2.4 cm. If the diameter of the wire is doubled, then the extension in its length will be [ MPPMT 1994]
  • a) 9.6 cm
  • b) 4.8 cm
  • c) 1.2 cm
  • d) 0.6cm
Q.17
A 2 m long rod of radius 1cm, which is fixed from one end is given twist of 0.8 radians. The shear strain developed will be [ Raj.PET 1997]
  • a) 0.002
  • b) 0.004
  • c)0.008
  • d)0.016
Q.18
Two wires of same material and length but diameter in the ratio 1 : 2 are stretched by the same force. the potential energy per unit volume for the two wires when stretched will be in the ratio [ CPMT 1998]
  • a) 16 : 1
  • b) 4 : 1
  • c) 2 : 1
  • d) 1 : 1
Q.19
A fixed volume of iron is drawn in to a wire of length l. The extension x produced in the wire by a constant force F is proportional to [ MPPMT 1999]
  • b) 1/l
  • c)l2
  • d)l
  • a)1 / l²
Q.20
The elastic energy stored in a wire of Youngs modulus Y is [ MPPMT 1999]
  • a) Y×(strain)2 / volume
  • b) stress × strain × volume
  • c)(stress)2 × volume / 2Y
  • d)½ Y × stress × strain × volume
Q.21
When there are no external force, the shape of liquid drop is determined by [ CPMT 1999]
  • a) surface tension of the liquid
  • b) Density of liquid
  • c)viscosity of liquid
  • d)temperature of air only
Q.22
An iron needle slowly placed on the surface of water floats on it because [ MNR 1993]
  • a) When inside the water it will displace water more than its weight.
  • b) The density of the material of needle is less than that of water
  • c) its surface tension
  • d) Of its shape
Q.23
A number of water droplets each of radius r collusion to form a droplet of radius R, the rise in temperature dθ is : [ MPPMT 1994]
  • a)
    ch-8_qn-122choice_img_no1.png
  • b)
    ch-8_qn-122choice_img_no2.png
  • c)
    ch-8_qn-122choice_img_no3.png
  • d)
    ch-8_qn-122choice_img_no4.png
Q.24
More liquid rises in a thin tube because of [ CPMT 1987]
  • a) Larger value of radius
  • b) Larger value of surface tension
  • c) small values of surface tension
  • d) small value of radius
Q.25
Two spherical soap bubbles of radii r1 and r2 in vacuum collapses under isothermal conditions. the resulting bubble has a radius R such that
  • a)
    ch-8_qn-125choice_img_no1.png
  • b)
    ch-8_qn-125choice_img_no2.png
  • c)
    ch-8_qn-125choice_img_no3.png
  • d)
    ch-8_qn-125choice_img_no4.png
Q.26
When soap bubble is charged [ Raj.PMT 1997]
  • a) It contracts
  • b) It expands
  • c)It does not undergo any change in size
  • d)None of these
Q.27
Small droplets of a liquid are usually more spherical in shape than the larger drop of the same liquid because [ EAMCET 1988]
  • a)Force of surface tension is equal and opposite to the force of gravity
  • b)Force of surface tension predominates the force of gravity
  • c)Force of gravity predominates the force of surface tension
  • d)Force of gravity and force of surface tension act in the same direction and are equal
Q.28
With a rise in temperature, the surface tension of liquid [ MPPMT 199]
  • a) Increases
  • b) Decreases
  • c) Does not change
  • d) Changes erratically
Q.29
Water rises to a height of 10 cm in a capillary tube, and mercury falls to a depth of 3.42 cm in the same capillary tube. if the density of mercury is 13.6 and the angle of contact is 135°, the ratio of surface tension for water and mercury is [ MPPMT 1988]
  • a)1 : 0.5
  • b) 1 : 3
  • c)1 : 6.5
  • d)1.5 : 1
Q.30
Surface tension may be defined as
  • a) The work done per unit area in increasing the surface area of liquid under isothermal condition
  • b) The work done per unit area in increasing the surface area of a liquid under adiabatic condition
  • c) the work done per unit area in increasing the surface area of liquid under both isothermal and adiabatic conditions
  • d)free surface energy per unit volume
0 h : 0 m : 1 s