A block of wood is floating in water at `0^@ C`. The temperature of water is slowly raised from `0^@ C` to `10^@ C`. How will the precentage of volume of block above water level change with rise in temperature?A. increaseB. decreaseC. first increase and then decreaseD. first decrease and then increase

A block of wood is floating in water at `0^@ C`. The temperature of wa

1.	A block of wood is floating in water at `0^@ C`. The temperature of water is slowly raised from `0^@ C` to `10^@ C`. How will the precentage of volume of block above water level change with rise in temperature?A. increaseB. decreaseC. first increase and then decreaseD. first decrease and then increase
Answer» Correct Answer - C Fraction of wooden block immersed at `0^@C` `(V_1)/(V_0)=((rho_("wood"))_(0^@C))/((rho_(H)_(2)O)_(0^@C))` `f_1=(V_0-V_1)/(V_0)=((rho_(H2O))_(0^@C)-(rho_("wood"))_(0^@C))/((rho_(H_2O))_(0^@C))` `V_1`- volume of wood immersed in water at `0^@C` `V_0`- Volume of wood `(rho_("wood"))_(0^@C)`- Density of wood at `0^@C` When the temperature is raised to `10^@C` the volume of wood immersed in water changes to `V_2`. `(V_2)/(V_0)=((rho_("wood"))_(0^@C))/((rho_(H_2O))_(0^@C))` `f_2=(V_0-V_2)/(V_0)=((rho_(H_2O))_(10^@C)-(rho_("wood"))_(10^@C))/((rho_(H_2O))_(10^@C))` From `0^@C` to `4^@C`, the density of water increases, and from `4^@C` to `10^@C` the density of water decreases. But for wood density decreases as temperature increases. The volume of block above water level will first increase and then decrease.

Discussion

No Comment Found

Related InterviewSolutions

A sinker of weight `w_0` has an apparent weight `w_1` when weighed in a liquid at a temperature `t_1 and w_2` when weight in the same liquid at temperature `t_2`. The coefficient of cubical expansion of the material of sinker is `beta`. What is the coefficient of volume expansion of the liquid.
Consider two rods of same length and different specific heats (`S_1` and `S_2`), conductivities `K_1` and `K_2` and area of cross section (`A_1` and `A_2`) and both having temperature `T_1` and `T_2` at their ends. If the rate of heat loss due to conduction is equal thenA. `K_1A_1=K_2A_2`B. `K_2A_1=K_1A_2`C. `(K_1A_1)/(S_1)=(K_2A_2)/(S_2)`D. `(K_2A_1)/(S_2)=(K_1A_2)/(S_1)`
If heat is supplied to a solid, its temperature (a) must increase (b) may increase (c) may remain constant (d) may decrease.
If head a supplied to a solid, its temperatureA. must increaseB. may increaseC. may remain constantD. may decrease
A copper block of mass `60kg` is heated till its temperature is increased by `20^(@)C` Find the head supplied to the block specific head capacity of `= 0.09 cal g^(-1)^(@)C`
In an industrial process 10 kg of water per hour is to be heated from `20^@C` to `80^@C`. To do this steam at `150^@C` is passed from a boiler into a copper coil immersed in water. The steam condenses in the coil and is returned to the boiler as water at `90^@C`. How many kilograms of steam is required per hour (specific heat of steam`=1 cal//g^@C`, Latent heat of vapourization`=540 cal//g`)?
Water at `0^@C` was heated until it started to boil and then until it all changed to steam. The time required to heat water from `0^@C` to `100^@C` is 5 min and the time to change boiling water to steam is 28 minutes. If the flame supplied heat at a constant rate, the specific latent heat of vaporisation of water (neglecting heat losses, container etc. is (in `J//g`). (specific heat of water s `=4.2 J//g` )A. 540B. 2268C. 2352D. 2356
A ball is droped as a floor from a height of `2.0m` After the collsion it rises up to a height of `1.5m` Assume thet `40%` of the machanical energy lost goes as thermal energy into the ball.Calculate the rise in the temperature of the ball in the colliation headcapacity of the ball is `800J K^(-1)`
Name three fossil fuels that emit carbon dioxide into the atmosphere
With the increase in carbon dioxide in the atmosphere the acidity of oceans will : (a) decrease (b) remain unaffected (c) increase (d) none of these

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment