Related InterviewSolutions

• Which of the curves in figure represents the telation between Celsius and Fahrenheit temperatures? ` `A. `a`B. `a`C. `a`D. `a`
• If a graph is plotted taking the temperature in Fahrenheit along the `Y`-axis and the corresponding temperature in Celsius along the `X`-axis, it will be a straight lineA. having a positive intercept on the `Y`-axisB. having a positive intercept on the `X`-axisC. passing through the originD. having a negative intercepts on both the axis
• A vernier calliper has 10 divisions on vernier scale coinciding with 9 main scale divisions. It is made of a material whose coefficient of linear expansion is `alpha= 10^(-3).^(@)C^(-1)`. At `0^(@)C` each main scale division = 1mm. An object has a length of 10 cm at a temperature of `0^(@)C` and its material has coefficient of linear expansion equal to `alpha_(1)=1xx10^(-4).^(@)C^(-1)`. The length of this object is measured using the said vernier calliper when room temperature is `50^(@)C`. (a) Find the reading on the main scale and the vernier scale (b) The same object is measured (at `50^(@)C`) using a wooden scale whose least count is 1mm. Write the measured reading using this scale assuming it to be correct at all temperature.
• Two samples of a liquid have volumes 400 cc and 220 cc and their temperature are `10^(@)C` and `110^@C` respectively. Find the final temperature and volume of the mixture if the two samples are mixed. Assume no heat exchange with the surroundings. Coefficient of volume expansion of the liquid is `g = 10^(-3).^(@)C^(-1)` and its specific heat capacity is a constant for the entire range of temperature.
• A composite bar has two segments of equal length L each. Both segments are made of same material but cross sectional area of segment OB is twice that of OA. The bar is kept on a smooth table with the joint at the origin of the co - ordinate system attached to the table. Temperature of the composite bar is uniformly raised by `Delta theta`. Calculate the x co-ordinate of the joint if coefficient of linear thermal expansion for the material is `alpha^(@)C^(-1)`
• A water in glass thermometer has density of water marked on its stem [Density of water is the thermometric property in this case]. When this thermometer is dipped in liquid A the density of water read is 0.99995 g `cm^(3)`. Thereafter it is dipped in liquid B and the reading remains unchanged. Maximum density of water is 1.00000 g `cm^(-3)`. (a) Can we say that liquid A and B are necessarily in thermal equilibrium? (b) If two liquids are mixed and the thermometer is inserted in the mixture, the height of water column in stem is found to change (i.e. reading is different from 0.99995 g `cm^(-3)`). Has the height increased or decreased?
• An iron rod of length `50cm` is joined at an end to an aluminium rod of length `100cm` . All measurements refer to `20^(@)C` . Find the length of the composite system at `100^(@)C` and its average coefficient of linear expansion. The coefficient of linear expansion of iron and aluminium are `12xx10^(-6)//^(@)C` and `24xx10^(-6)//^(@)C` respectively.
• Two rods , one of aluminium and the other made of steel, having initial length `l_(1)` and `l_(2)` are connected together to from a sinlge rod of length `l_(1)+l_(2)` . The coefficient of linear expansion for aluminium and steel are `alpha_(a)` and `alpha_(s)` for `AC` and `BC` . If the distance `DC` remains constant for small changes in temperature,A. `(alpha_(s))/(alpha_(a))`B. `(alpha_(a))/(alpha_(s))`C. `(alpha_(s))/((alpha_(a)+alpha_(s)))`D. `(alpha_(a))/((alpha_(a)+alpha_(s)))`
• (a) A steel tank has internal volume `V_0` (= 100 litre). It contains half water ( volume = `(V_0)/2` ) and half kerosene oil at temperature `theta_(1) = 10^(@)C` Calculate the mass of kerosene that flows out of the tank at temperature of `theta_(2)=40^(@)C`. Coefficient of cubical expansion for different substances are: `gamma_(k)=10^(-3).^(@)C^(-1), gamma_(w)=2xx10^(-4) .^(@)C^(-1), gamma_("steel")=1.2xx10^(-5).^(@)C^(-1)`. density of kerosene at `10^(@)C` is `rho_(1)=0.8 kg` /litre. (b) In the last problem the height of water in the container at `theta_(1)=10^(@)C` is `H_1 = 1.0 m`. Find the height of water at `theta_(2) = 40^(@)C`.
• There are two sphers of same radius and material at the same temperature but one being solid while the other hollow. Which sphere will expand more if they are given the same amount of heat ?A. sameB. hollow sphereC. solid sphereD. no conclusion