Q.1
Mercury thermometer can be used to measure temperature up to [ CBSE-PMT 1992]
  • a)260°C
  • b) 100°C
  • c)357°C
  • d)500°C
Q.2
Two rods of thermal conductivities K1 and K2 cross-sections A1 and A2 and specific heats S1 and S2 are of equal lengths. The temperatures of two ends of each rod are T1, and TThe rate of flow of heat at the steady state will be equal if[ CBSE-PMT 2002]
  • a)
    ch-8_qn-34choice_img_no1.png
  • b) K1A1=K2A2
  • c) K1S1=K2S2
  • d) A1S1=A2S2
Q.3
Consider a compound slab consisting of two different materials having equal thick nesses and thermal conductivities K and 2K, respectively. The equivalent thermal conductivity of the slab is [ CBSE-PMT 2003]
  • a) (4/3) K
  • b) (2/3) K
  • c)√3 K
  • d)3 K
Q.4
A cylindrical rod having temperature T1 , and T2 at its end. The rate of flow of heat is Q1 cal/sec. If all the linear dimensions are doubled keeping temperature constant, then the rate of flow of heat Q2 will be [ CBSE-PMT 2001]
  • a) 4Q1
  • b) 2Q1
  • c) Q1 / 4
  • d) Q1 / 2
Q.5
A vessel containing water is given a constant acceleration 'a' towards the right along a straight horizontal path. Which of the following diagram in fiure represents the surface [ IIT 1981]
  • a)
    ch-8_qn-37choice_img_no1.png
  • b)
    ch-8_qn-37choice_img_no2.png
  • c)
    ch-8_qn-37choice_img_no3.png
  • d)none of these
Q.6
The following four wires are made of the same meterial. Which of these will have the largest extension when the same tension is applied [IIT 1981]
  • a) length=50 cm, diameter=0.5 mm
  • b) length=100 cm, diameter=1 mm
  • c)length=200 cm, diameter=2 mm
  • d)length=300 cm, diameter=3 mm
Q.7
A U tube of uniform cross section is partially filled with liquid I and another liquid II which does not mix with liquid I is poured into one side as shown in figure. It is found that the liquid levels of the two sides of the tube are same, while the level of liquid I has risen by 2 cm. If the specific gravity of liquid is 1.1, the specific gravity of liquid II must be [ IIT 1983]
ch-8_que_no-39_img_no1.png
  • a) 1.12
  • b) 1.1
  • c)1.05
  • d)1.0
Q.8
A homogeneus solid cylinder of length L ( L < H/2), cross-sectional area A/5 is immersed such that it flots with its axis verical at the liquid-liquid interface with length L/4 in the denser liquid as shown in the figure. The lower density liquid is open to atmosphere having pressure PThen density D of solid is given by [ IIT 1995]
ch-8_que_no-40_img_no1.png
  • a) 5d/4
  • b) 4d/5
  • c) 4d
  • d) d/5
Q.9
A large open tank has two holes in the wall. One is square hole of side L at a depth y from the top and the other circular hole of radius R at depth 4y from the top. When the tank is completely filled with water, the quantities of water flowing out per second from both holes are same. Then R is equal to [ IIT 2005]
  • a)L/√2π
  • b) 2πL
  • c)L
  • d)L/2π
Q.10
A hemispherical portion of radius R is removed from the bottom of a cylinder of radius R. The volume of the remaining cylinder is V and its mass M. It is suspended by a string in a liquid of density ρ where it stays verical. The upper surface of the cylinder is at a depth h below the liquid surface. The force on the bottom of the cylinder by the liquid is [ IIT 2001]
ch-8_que_no-42_img_no1.png
  • a) Mg
  • b) Mg- Vρg
  • c)Mg+πR2hρg
  • d)ρg(V+πR2h)
Q.11
A wooden block, with coin placed on its top, floats in water as shown in figure. The distance l and h are shown here. After some time the coin falls into the water. then [ IIT 2002]
ch-8_que_no-43_img_no1.png
  • a)l decreases and h increases
  • b) l increases and h decreases
  • c)both l and h increases
  • d)both l and h decreases
Q.12
The adjacent graph shows the extension (Δl) of a wire of length 1 m suspended from the top of a roof at one end and with load W connected to the other end. If the cross sectional area of the wire is 10-6 m2, calculate the Young modulus of the material of the wire [ IIT 2003]
ch-8_que_no-44_img_no1.png
  • a) 2 ×1011 N/m
  • b) 2 ×10⁻¹¹ N/m
  • c) 3 ×10⁻¹² N/m
  • d) 2 ×10⁻¹³ N/m
Q.13
Water is filled in a container upto height 3m. A small hole of area 'a' is punched in the wall of the container at a height 52.5cm from bottom. the cross sectional area of the container is A. If a/A=0.1, then v2 is ( where v is the velocity of water coming out of hole) [ IIT 2005]
  • a)50
  • b) 51
  • c)48
  • d)51.5
Q.14
When temperature of gas is 20° C and pressure is changed from P1=1.01×105 Pa to P2=1.165×105 Pa then the volume changed by 10%. the bulk modulus is [ IIT 2005]
  • a) 1.55×105Pa
  • b) 0.115×105Pa
  • c)1.4×105Pa
  • d)1.01×105Pa
Q.15
A glass tube of uniform internal radius (r) has a valve separating the two identical ends. Initially, the valves is in a tightly closed position. End 1 has a hemispherical soap bubble of radius r. End 2 has sub-hemispherical soap bubble as as shown in figure. Just after opening the valve [ IIT 2008]
ch-8_que_no-47_img_no1.png
  • a)air from end 1 flows towards end 2. No change in the volume of the soap bubbles
  • b)air from end 1 flows towards end 2. volume of the soap bubble at end 1 decreases
  • c)no changes occurs
  • d)air from end 2 flows towards end 1. Volume of the soap bubble at end 1 increases
Q.16
A spring of force constant 800N/m has an extension of 5 cm. The work done in extending it from 5cm to 15 cm is [ AIEEE 2002]
  • a) 16J
  • b) 8J
  • c) 32J
  • d) 24 J
Q.17
A wire fixed at the upper end stretched by length l by applying a force F. The work done in stretching is [ AIEEE 2004]
  • a)2Fl
  • b) Fl
  • c)F/2l
  • d)Fl/2
Q.18
Spherical ball of radius 'R' are falling in a viscus fluid of viscosity 'η' with a velocity 'v'. The retarding viscous force acting on the spherical ball is [ AIEEE 2004]
  • a) inversely proportional to both radius 'R' and velocity 'v'
  • b) directly proportional to both radius 'R' and velocity 'v'
  • c)directly proportional to 'R' but inversely proportional to 'v'
  • d)inversely proportional to 'R' but directly proportional to velocity 'v'
Q.19
Two soap bubbles of different radii are connected by tube [ AIEEE 2004]
  • a) air flows from the smaller bubble to the bigger
  • b) air flows from bigger bubble to the smaller bubble till the size are interchanged
  • c)air flows from the bigger bubble to the smaller bubble till the size becomes equal
  • d)there is no flow of air
Q.20
If 'S' is stress and 'Y' is young's modulus of material of a wire, the energy stored in the wire per unit volume is [ AIEEE 2005]
  • a) S2 / 2Y
  • b) 2S2 Y
  • c) S/ 2Y
  • d) 2Y/S2
Q.21
A 20cm long capillary tube is dipped in water. The water rises up to 8 cm. If the entire arrangement is up in a freely falling elevator the length of water column in the capillary tube will be [ AIEEE 2005]
  • a)10 cm
  • b) 8 cm
  • c)20 cm
  • d)4 cm
Q.22
A wire elongated by l mm when load W is hanged from it. If the wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be ( in mm) [AIEEE 2006]
  • a) l
  • b) 2l
  • c)zero
  • d)l/2
Q.23
If the terminal speed of a sphere of gold ( density=19.5 kg/m3) is 0.2 m/s in a viscous liquid ( density=1.5 kg/m3), find the terminal speed of a sphere of silver ( density=10.5kg/m3) of the same size in the same liquid [ AIEEE 2006]
  • a) 0.4 m/s
  • b) 0.133 m/s
  • c)0.1 m/s
  • d)0.2 m/s
Q.24
A sphere solid ball of volume V is made of a material of density ρIt is falling through a liquid of density ρ2 . Assume that the liquid applies a viscous force on the ball that is proportional to square of its speed v,Fviscous=-kv2 (k > 0). The terminal velocity of the ball is [ AIEEE 2008]
  • a)
    ch-8_qn-56choice_img_no1.png
  • b)
    ch-8_qn-56choice_img_no2.png
  • c)
    ch-8_qn-56choice_img_no3.png
  • d)
    ch-8_qn-56choice_img_no4.png
Q.25
16 cm3 of water flows per second through a capillary tube of radius a cm and length l cm when connected to a pressure head of h cm of water. If a tube of the same length and radius a/2 cm is connected to the same pressure head, the quantity of water following through the tube per second will be [ CPMT 1998]
  • a) 16 cm3
  • b) 4 cm3
  • c) 1 cm3
  • d) 8 cm3
Q.26
Two wires are made of same material and have the same volume. However wire 1 has cross-section area A and wire 2 has crosssectional area 3A. If the length of wire 1 increases by Δx on appling force F, how much force is needded to stretch wire 3 by same amount
  • a) 4F
  • b) 6F
  • c)9F
  • d)F
Q.27
In order that a floating object be in stable equilibrium, its centre of buoyancy should be
  • a) vertically above its centre of gravity
  • b) vertically below its centre of gravity
  • c)Horizontally line with its centre of gravity
  • d)May be anywhere
Q.28
A large air bubble of radius r rises from the bottom of a lake to the surface. The depth of the lake is 7H. If the atmospheric pressure is equal to that of water height H, the radius of the bubble is
  • a) r
  • b) 2r
  • c) 3r
  • d) 8r
Q.29
A block of ice is floating on water contained in a beaker. When all ice melts, the level of water
  • a) Rises
  • b) Falls
  • c)Remains unchanged
  • d)none
Q.30
A body is just floating in a liquid 99 their densities are equal). If the body is slightly pressed down and released it will
  • a) start oscillating
  • b) sink to the bottom
  • c)comes back to the same position immediately
  • d)come back to the same position immediately.
0 h : 0 m : 1 s