Heat and Thermal Expansion Questions

One end of a horizontal thick copper wire of length 2L and radius 2R is welded to an end of another horizontal thin copper wire of length L and radius R. When the arrangement is stretched by applying ...

The pressure that has to be applied to the ends of a steel rod of length 10 cm to keep its length constant when its temperature is raised by 100oC is :(For steel Young′s modulus is 2 × 1011...

A thermodynamic system undergoes cyclic process ABCDA as shown figure. The work done by the system is : -...

A sonometer wire of length 1.5 m is made of steel. The tension in it produces an elastic strain of 1%. What is the fundamental frequency of steel if density and elasticity of steel are 7.7 × 103 kg/m...

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?

A wooden wheel of radius R is made of twosemicircular parts (see figure). The two partsare held together by a ring made of a metal stripof cross sectional area S and Length L. L isslightly less than ....

In the determination of Young′s modulus by using Searle′s method, a wire of length L = 2mand diameter d = 0.5 mm is used. For a load M = 2.5 kg, an extension l = 0.25 mm in the length of t...

A thermocouple of negligible resistance produces an e.m.f of 40 μ V/oC in the linear range of temperature. A galvanometer of resistance 10 Ω whose sensitivity is 1μ A/div, is employed w...

Two conductors have the same resistance at 0oC but their temperature coefficients of resistance are α1 and α2. The respective temperature coefficients of their series and parallel combinatio...

The thermo e.m.f. E in volts of a certain thermocouple is found to very with temperature difference θ in oC between the two junctions according to the realtion E = 30θ - The neutral temperat...

Two wires are made of the same material and have the same volume. However wire 1 has crosssectional area A and wire-2 has cross-sectional area 3A. If the length of wire 1 increases by ᐃx on appl...

A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold then, an electric current will

A wire elongates by l mm when a 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)...

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

The thermistors are usually made of

Time taken by a 836 W heater to heat one litre of water from 10oC to 40oC is

The thermo emf of a thermocouple varies with the temperature θ of the hot junction as E = a θ + bθ2 in volts where the ratio a/b is 700oC. If the cold junction is kept at 0oC, then the ...

The thermo e.m.f. of a thermo-couple is 25 μV/oC at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as 10-5 A, is connected with the thermocouple. The s...

Copper of fixed volume V is drawn into wire of length l. When this wire is subjected to a constant force F, the extension produced in the wire is ᐃI. Which of the following graphs is a straight ...

In the following figure a wire of cross sectional radius r is fixed lightly at P and Q. The Young′s modulus of the material of the wire is Y and a...