Thermal Expansion Questions and Answers

Steel wire of length L at 40 C is suspended from the ceiling and then a mass m is hung from its free end The wire is cooled down from 40 C to 30 C to regain its original length L The coefficient of linear thermal expansion of the steel is 105PC Young s modulus of steel is 10 N m and radius of the vire is 1 mm Assume that L diameter of the wire Then the value of m in kg is nearly 2011
Physics
Thermal Expansion
Steel wire of length L at 40 C is suspended from the ceiling and then a mass m is hung from its free end The wire is cooled down from 40 C to 30 C to regain its original length L The coefficient of linear thermal expansion of the steel is 105PC Young s modulus of steel is 10 N m and radius of the vire is 1 mm Assume that L diameter of the wire Then the value of m in kg is nearly 2011
PHYSICS A semi circular disc of radius R is placed on a smooth horizontal surface Figure shows top view of this If temperature is increased by At then displacement of coefficient of linear expansion is a A A along y axis is Raat 4R B A along x axis is ast 3m C B along x axis is Rast D B along y axis is zero
Physics
Thermal Expansion
PHYSICS A semi circular disc of radius R is placed on a smooth horizontal surface Figure shows top view of this If temperature is increased by At then displacement of coefficient of linear expansion is a A A along y axis is Raat 4R B A along x axis is ast 3m C B along x axis is Rast D B along y axis is zero
21 a An oil trucker loaded 40000 liters of certain fuel during his travel He reached the destination where the temperature was 20 C lower than that of the temperature at the starting point The coefficient of the volume expansion of the fuel is 8 225x10 4 C How much load he delivered at the destination point
Physics
Thermal Expansion
21 a An oil trucker loaded 40000 liters of certain fuel during his travel He reached the destination where the temperature was 20 C lower than that of the temperature at the starting point The coefficient of the volume expansion of the fuel is 8 225x10 4 C How much load he delivered at the destination point
A thermally insulated vessel contains an ideal gas of molecular mass M and ratio of specific heats y It is moving with speed v and is suddenly brought to rest Assuming no heat is lost to the surroundings its temperature increases by 1 7 1 2 y 1 R Mv K 2 Y Mv K 27R 3 My K 2R 7 1 Mv K 4 AIEEE 2011 2R partition fitted with a valye One part is filled with an
Physics
Thermal Expansion
A thermally insulated vessel contains an ideal gas of molecular mass M and ratio of specific heats y It is moving with speed v and is suddenly brought to rest Assuming no heat is lost to the surroundings its temperature increases by 1 7 1 2 y 1 R Mv K 2 Y Mv K 27R 3 My K 2R 7 1 Mv K 4 AIEEE 2011 2R partition fitted with a valye One part is filled with an
A rod of length 20 cm is made of metal It expands by 0 075cm when its temperature is raised from 0 C to 100 C Amother rod of a different metal B having the same length expand by 0 45 cm for the same change in temperature A third rod of the same length is composed of two parts one of metal A and the other of metal B This rod expands by 0 060 cm for the same change in temperature The portion made of metal A has the length 1 20 cm 2 10 cm AIPMT 91 3 15 cm 4 18 cm
Physics
Thermal Expansion
A rod of length 20 cm is made of metal It expands by 0 075cm when its temperature is raised from 0 C to 100 C Amother rod of a different metal B having the same length expand by 0 45 cm for the same change in temperature A third rod of the same length is composed of two parts one of metal A and the other of metal B This rod expands by 0 060 cm for the same change in temperature The portion made of metal A has the length 1 20 cm 2 10 cm AIPMT 91 3 15 cm 4 18 cm
The thermal conductivity of brick is 1 7 W m K and that of cement is 2 9 W m K What thickness of cement will have same insulation as the brick of thickness 20 cm Assuming their area to be same
Physics
Thermal Expansion
The thermal conductivity of brick is 1 7 W m K and that of cement is 2 9 W m K What thickness of cement will have same insulation as the brick of thickness 20 cm Assuming their area to be same
3 7 x 10 J 4 A diatomic ideal gas is used in a Carnot engine as the working substance If during the adiabatic expansion part of t cycle the volume of the gas increases from V to 32 V the efficiency of the engine is AIEEE 201 1 0 5 2 0 75 3 0 99 4 0 25
Physics
Thermal Expansion
3 7 x 10 J 4 A diatomic ideal gas is used in a Carnot engine as the working substance If during the adiabatic expansion part of t cycle the volume of the gas increases from V to 32 V the efficiency of the engine is AIEEE 201 1 0 5 2 0 75 3 0 99 4 0 25
Four metalic conductors having different shape Sphere cylinder pear lighting conductor an mounted on insulating stands and charged TH one which is best suited to retain the charges fo a longer time is 1 Sphere 3 Pear 2 Cylinder 4 Lightning conduct
Physics
Thermal Expansion
Four metalic conductors having different shape Sphere cylinder pear lighting conductor an mounted on insulating stands and charged TH one which is best suited to retain the charges fo a longer time is 1 Sphere 3 Pear 2 Cylinder 4 Lightning conduct
A glass cylinder contains mo 100 g of mercury at a temperature of to 0 C When temperature becomes t 20 C the cylinder contains 99 7 g of mercury The coefficent of volume expension of mercury XHE 18 times 10 5 C Assume that the temperature of the mercury is equal to that of the cylinder The coefficent of linear expansion of glass a is A B C D 10 5 C 2 x 10 5 C 3 x 10 5 C 6 10 5 C
Physics
Thermal Expansion
A glass cylinder contains mo 100 g of mercury at a temperature of to 0 C When temperature becomes t 20 C the cylinder contains 99 7 g of mercury The coefficent of volume expension of mercury XHE 18 times 10 5 C Assume that the temperature of the mercury is equal to that of the cylinder The coefficent of linear expansion of glass a is A B C D 10 5 C 2 x 10 5 C 3 x 10 5 C 6 10 5 C
Density of a substance at 0 Cis 10 6 g cc and at 100 C is 10 g cc Find the coefficient of linear expansion of solid a 0 0006 C b 0 0004 C c 0 0003 C d 0 0002
Physics
Thermal Expansion
Density of a substance at 0 Cis 10 6 g cc and at 100 C is 10 g cc Find the coefficient of linear expansion of solid a 0 0006 C b 0 0004 C c 0 0003 C d 0 0002
3 A solid sphere of radius r made of a soft material of bulk modulus K is surrounded by a liquid in a cylindrical container A massless piston of area a floats on the surface of the liquid covering entire cross section of cylindrical container When a mass m is placed on the surface of the piston dr to compress the liquid the fractional decrement in the radius of the sphere 1 mg 3 Ka 2 mg Ka 3 Ka mg 4 is Ka 3 mg
Physics
Thermal Expansion
3 A solid sphere of radius r made of a soft material of bulk modulus K is surrounded by a liquid in a cylindrical container A massless piston of area a floats on the surface of the liquid covering entire cross section of cylindrical container When a mass m is placed on the surface of the piston dr to compress the liquid the fractional decrement in the radius of the sphere 1 mg 3 Ka 2 mg Ka 3 Ka mg 4 is Ka 3 mg
TWO and 3h 2 are the V2 is 25 A constant force Fo is applied on a uniform elastic string placed over a smooth horizontal surface as shown in figure Young s modulus of string is Y and area of cross section is S The strain produced in the string in the direction of force is a For S b Fo SY L c Fo Fo 2SY d Foy 2S
Physics
Thermal Expansion
TWO and 3h 2 are the V2 is 25 A constant force Fo is applied on a uniform elastic string placed over a smooth horizontal surface as shown in figure Young s modulus of string is Y and area of cross section is S The strain produced in the string in the direction of force is a For S b Fo SY L c Fo Fo 2SY d Foy 2S
At some temperature T a bronze pin is a little large to fit into a hole drilled in a steel block The change in temperature required for an exact fit is minimum when only the block is heated both block and pin are heated together both block and pin are cooled together only the pin is cooled
Physics
Thermal Expansion
At some temperature T a bronze pin is a little large to fit into a hole drilled in a steel block The change in temperature required for an exact fit is minimum when only the block is heated both block and pin are heated together both block and pin are cooled together only the pin is cooled
Three uniform rods of lengths l 2l and 3l masses m 2 m and 3 m and coefficient of linear expansion a 2a and 3a are placed in contact on a smooth horizontal surface as shown in figure The temperature of the system is increased by T Which of the following options is are correct Take laT e 1 A C B m m m m 77 m l a 2m 2l 2a B and C shift by equal distance 2e in opposite directions A shifts left by 35 e D shifts right by 777 77 3m 36 3a 49 A and D shift by equal distance 7e in opposite directions
Physics
Thermal Expansion
Three uniform rods of lengths l 2l and 3l masses m 2 m and 3 m and coefficient of linear expansion a 2a and 3a are placed in contact on a smooth horizontal surface as shown in figure The temperature of the system is increased by T Which of the following options is are correct Take laT e 1 A C B m m m m 77 m l a 2m 2l 2a B and C shift by equal distance 2e in opposite directions A shifts left by 35 e D shifts right by 777 77 3m 36 3a 49 A and D shift by equal distance 7e in opposite directions
l Question 12 A system of rods is assembled such that each rod has a length and cross sectional area S The mode of heat transfer is conduction and the system is in steady state The temperature of junction A is T and that of C is 2T Thermal conductivities of rods are mentioned in term of k Now answer the following questions D A 2k k 2k B Temperature of junction B is Options a 1 4T b 1 6T c 1 8T d 1 5T I
Physics
Thermal Expansion
l Question 12 A system of rods is assembled such that each rod has a length and cross sectional area S The mode of heat transfer is conduction and the system is in steady state The temperature of junction A is T and that of C is 2T Thermal conductivities of rods are mentioned in term of k Now answer the following questions D A 2k k 2k B Temperature of junction B is Options a 1 4T b 1 6T c 1 8T d 1 5T I
Two conductors A and B each of cross section area 5 cm are connected in series Variation of temperature in C along the length in cm is as shown in the figure If thermal conductivity of A is 120 J m sec C The thermal conductivity of B is 40K J m sec C Find the value of K TA 53 A 25cm 45 B 50cm X
Physics
Thermal Expansion
Two conductors A and B each of cross section area 5 cm are connected in series Variation of temperature in C along the length in cm is as shown in the figure If thermal conductivity of A is 120 J m sec C The thermal conductivity of B is 40K J m sec C Find the value of K TA 53 A 25cm 45 B 50cm X