Physics questions
20027 published questions with worked solutions.
- The length of the two rods made up of the same metal and having the same area of cross-section are 0.6 m and 0.8 m, respectively....
- Equal temperature differences exist between the ends of two metallic rods 1 and 2 of equal lengths. Their thermal conductivities...
- In a steady state, the temperature at the ends A and B of 20 cm long rod AB are 100^ C and 0^ C . The temperature of a point 9 cm...
- If a body cools down from 80^ C to 60^ C in 10 min when the temperature of the surrounding is 30^ C . Then, the temperature of...
- A body cools from 50^ C to 40^ C in 5 min. The surrounding temperature is 20^ C . In what further time (minute) will it cool to...
- A liquid cools from 50^ C to 45^ C in 5 min and from 45^ C to 41.5^ C in the next 5 min. The temperature of the surrounding is
- A calorimeter contains 10 g of water at 20^ C . The temperature falls to 15^ C in 10 min. When calorimeter contains 20 g of water...
- A metal rod having linear expansion coefficient 2 10^ -5 , ^ C ^ -1 has a length of 1 m at 20^ C . The temperature at which it is...
- A clock with an iron pendulum keeps correct time at 15^ C . What will be the error in second per day, if the room temperature is...
- A thin copper wire of length l increase in length by 1% when heated from 0^ C to 100^ C . If a thin copper plate of area 2l l is...
- The density of a substance at 0^ C is 10 g/cc and at 100^ C , its density is 9.7 g/cc. The coefficient of linear expansion of the...
- A steel tape measures the length of a copper rod as 90.0 cm, when both are at 10^ C , the calibration temperature for the tape....
- An amount of water of mass 20 g at 0^ C is mixed with 40 g of water at 10^ C , final temperature of the mixture is
- 22 g of carbon dioxide at 27^ C is mixed in a closed container with 16 g of oxygen at 37^ C . If both gases are considered as...
- The temperature of equal masses of three different liquids A, B and C are 12^ C , 19^ C and 28^ C , respectively. The temperature...
- A wall has two layers A and B, made of two different materials. The thermal conductivity of material A is twice that of B. If the...
- A cylindrical rod with one end in a steam chamber and the other end in ice results in melting of 0.1 g of ice per second. If the...
- Two rods P and Q have equal lengths. Their thermal conductivities are K_1 and K_2 and cross-sectional areas are A_1 and A_2. When...
- Two cylindrical conductors A and B of same metallic material have their diameters in the ratio 1:2 and lengths in the ratio 2:1,...
- A body cools from 80^ to 50^ in 5 min. Calculate the time, it takes to cool from 60^ to 30^ . The temperature of the surroundings...