Q.1
A block of ice in which a piece of stone is embedded is floating on water contained in a beaker. When all the ice melts the level of water
  • a) Rises
  • b) Falls
  • c)Remains unchanged
  • d)none
Q.2
1 kg of cotton and iron in air are transferred to vacuum and weighed again then.
  • a) Cotton and iron will weigh same
  • b) Iron will weigh more than cotton
  • c) Cotton will weigh more than iron
  • d) None of the above
Q.3
A boat carrying a number of stones is floating in a water tank. If the stone are unloaded into water level in the tank will
  • a)Remain unchanged
  • b) Rise
  • c)Fall
  • d)Rise or fall depending on the number of stones unloaded.
Q.4
An alloy of gold and copper weighs 0.2kg in air and 0.188 kg in water. The densities of gold and copper are 19.3×103 kg m-3 and 8.93×103kg m-3 respectively. The amount of gold in block is nearly
  • c)0.173 kg
  • d)0.388 kg
  • a)12×10⁻³kg
  • b) 12×10⁻³kg
Q.5
The density of atmospheric air varies with height above the ground according to the relation ρ=ρ0 e-λh , where λ is constant. The pressure at height h is given by
  • a)
    ch-8_qn-67choice_img_no1.png
  • b)
    ch-8_qn-67choice_img_no2.png
  • c)
    ch-8_qn-67choice_img_no3.png
  • d)
    ch-8_qn-67choice_img_no4.png
Q.6
the spring balance A reads 2kg with block m suspended from it. A balance B reads 5kg when a beaker with liquid is put on the pan of the balance. the two balances are now so arranged that hanging mass is inside the liquid in the beaker as shown. In this situation [ IIT 1985]
  • a) The balance A will read more than 2kg
  • b) The balance B will read less than 5kg
  • c) The balance A will read less than 2kg and B will read more than 5 kg
  • d) the balance A and B will read 2kg and 5 kgs respectively
Q.7
A vessel contains oil ( density=0.8 gm/cm3) over mercury ( density=13.6 gm/cm3). A homogeneous sphere floats with half of its volume immersed in mercury and the other half in oil. Then density of material of the sphere in gm/cm3 is [ IIT 1988]
  • a)3.3
  • b) 6.4
  • c)7.2
  • d)2..8
Q.8
The principle of the operation of hydraulic press is based on
  • a) Boyle's law
  • b) Pascal's law
  • c)Dalton's law of partial pressure
  • d)Newtons law of gravitation
Q.9
Pressure applied to enclosed fluid is
  • a) Increased and applied to every part of the fluid
  • b) Diminished and transmitted to wall of container
  • c)Increased in proportion to the mass of the fluid and then transmitted
  • d)Transmitted unchanged to every portion of the fluid and walls of containing vessel
Q.10
A parrot is in a wire cage which is hanging from a spring balance. Initially the parrot sits in the cage and in the second instant the parrot flies inside the cage
  • a) The reading of the balance will be grater when the parrot flies in the cage.
  • b) the reading of the balance will be lesser when the parrot flies in the cage
  • c) the reading will remain unchanged
  • d) None of the above
Q.11
Two vessels A nad B have same base area and contain water to the same height, but the mass of water in A is four times that in B. The ratio of the liquid thrust at the base of A to that of B is
  • a)4 : 1
  • b) 2 : 1
  • c)1 : 1
  • d)16 : 1
Q.12
A wooden rod of uniform cross-section and length 120cm, having density d is hanged at the bottom of a tank which is filled with water to a height of 40cm. Under equilibrium conditions, it makes an angle of 60° with the vertical. The centre of buoyancy of the rod is located at a distance ( measured from the hinge, along the length ) of [ SCRA 1994]
  • a) 90 dcm
  • b) 60 dcm
  • c)40 dcm
  • d)20 dcm
Q.13
A cubical block of wood of specific gravity 0.5 and chunk of concrete of specific gravity 2.5 are fastened together. The ratio of the mass of wood to the mass of concrete, which makes the combination to floate with its entire volume submerged under water is [ SCRA 1994]
  • a) 1/5
  • b) 1/3
  • c)3/5
  • d)2/3
Q.14
In a surface tension experiment with a capillary tube water rises upto 0.1m. If the same experiment is repeated on a n artificial satellite which revolving around the earth, water will rise in capillary tube upto height of [ CPMT 1998]
  • a)0.1 m
  • b) 9.8 m
  • c)0.98 m
  • d)full length of capillary tube
Q.15
A man is carrying a block of a certain substance ( of density 1000 kg/m3) weighing 1 kg in left hand and a bucket filled with water and weighing 10 kg in his right hand. He drops the block into bucket. How much load does he carry in his right hand now [ UGET 1995]
  • a)9 kg
  • b) 10 kg
  • c)11 kg
  • d)12 kg
Q.16
Two rods A and B of same material and length, have their electric resistance in ratio 1:2, When both rods are dipped in water, the correct statement will be [ Raj. PMT 1997]
  • a) A has more loss of weight
  • b) B has more loss of weight
  • c)Both have same loss of weight
  • d)Loss ratio will be in the ratio 1:2
Q.17
The volume of air bubble becomes three times as it rises from the bottom of lake to its surface. Assuming atmospheric pressure to be 75 cm of Hg and the density of water is to be 0.1 times of the density of mercury, the depth of the lake is [ AMU 1995]
  • a) 5 m
  • b) 10 m
  • c)15 m
  • d)20 m
Q.18
the density of ice is x gm/cm3 and that of water is y gm/cm3 when m gram of ice melts, then the change in volume is
  • a) m(y-x)
  • b) (y-x)/m
  • c) my(x-y)
  • d) (m/y) - (m/x)
Q.19
Hook's law essentially defines [ MPPMT 1998]
  • a)Stress
  • b) Strain
  • c)Yield point
  • d)Elastic limit
Q.20
Bulk modulus was first defined by [ CPMT 1987]
  • a) Young
  • b) Bulk
  • c)Maxwell
  • d)none
Q.21
The beam of metal supported at the two ends is loaded at centre. The depression at the centre is proportional to
  • a) Y2
  • b) Y
  • c)1/Y
  • d)1/Y2
Q.22
A wire is stretched by 0.1m by a certain force F. Another wire of same material whose diameter and lengths are doubled to the original wire is stretched by the same force. Then its elongation will be .. [ EAMCET 1995]
  • a) 0.005 m
  • b) 0.01 m
  • c) 0.02 m
  • d) 0.02 m
Q.23
Two rods of different materials having coefficient of linear expansion α1 , α2 and Young's modulii Y1 , Y2 respectively are fixed between two rigid massive walls. the rods are heated such that they undergoes the same increase in temperature. there is no bending of rods. If α1 : α2=2 : 3, the thermal stress developed in two rods are equal provided Y1:Y2 is equal to [ IIT 1989]
  • a)3 : 2
  • b) 1 : 1
  • c)2 : 3
  • d)4 : 9
Q.24
A spherical ball contracts in volume by 0.01%, when subjected to a normal uniform pressure of 100 atmospheres. The bulk modulus of its material in dynes/cm2 is
  • a) 10 ×1012
  • b) 100 ×1012
  • c)1 ×1012
  • d)2 ×1012
Q.25
Two wires A and B are of the same material. their lengths are in ratio 1:2 and the diameters are in ratio 2:If they are pulled by the same force, the increase in length will be in ratio [ MPPMT 1988]
  • a)2 : 1
  • b) 1 : 4
  • c)1 : 8
  • d)8 : 1
Q.26
A thick copper rope of density 1.5×103 kg/m3 and Young's modulus 5×106 N/m2, 8 m in length is hung from the ceiling of a room. The increase in its length due to its own weight is [ CPMT 1998]
  • d) 9.6 m
  • a) 9.6×10⁻² m
  • b) 19.2×10⁻⁷ m
  • c) 9.6×10⁻³ m
Q.27
The upper end of a wire of radius 4mm and length 100 cm is clamped and its other end is twisted through an angle of 30°. Then angle of shear is [ NCERT 1990]
  • a)12°
  • b) 0.12°
  • c)1.2°
  • d)0.012°
Q.28
A cube at temperature 0°C is compressed equally from all sides by an external pressure P. By what amount should its temperature be raised to bring it back to the size it had before the external pressure was applied. the bulk modulus of the material of the cube is K and the coefficient of linear expansion is α [ CPMT 1998]
  • a) P / Kα
  • b) P/ 3Kα
  • c)3Pα / K
  • d) 3K/ P
Q.29
A steel ring of radius r and cross-section area 'A' is fitted onto a wooden disc of radius R(R>r). If young's modulus be E, then the force with which the steel ring is expanded is [ AP 1986]
  • a)
    ch-8_qn-92choice_img_no1.png
  • b)
    ch-8_qn-92choice_img_no2.png
  • c)
    ch-8_qn-92choice_img_no3.png
  • d)
    ch-8_qn-92choice_img_no4.png
Q.30
The extension of wire by the application of load is 3mm. The extension in a wire of the same material and length but half the radius by the same load [ CPMT 1990]
  • a)12 mm
  • b) 0.75 mm
  • c)6 mm
  • d)15 mm
0 h : 0 m : 1 s