MHT CET questions
29293 published questions with worked solutions.
- A body having a surface area of 50 cm^2 radiates 300 J of energy per minute at a temperature of 727°C. The emissivity of the body...
- Rate of loss of heat at 600 K, if surrounding temperature is 300 K is R. The rate of heat loss at 900 K is
- A black body radiates 6 J/cm^2s when its temperature is 127°C. How much heat will be radiated per square centimeter per second...
- If the temperature of a hot body is increased by 50%, then the increase in the quantity of emitted heat radiation will be
- A spherical black body with a radius of 12 cm radiates 440 W power at 500 K. If the radius were halved and the temperature...
- If the temperature of black body decreases to half of the initial temperature, then the radiation emitted by the body will be...
- At 127°C, the radiated energy is 2.7 10^ -3 J/s. At what temperature is radiated energy 4.32 10^ 6 J/s?
- The unit of Stefan's constant is:
- If R is universal gas constant, then the amount of heat needed to raise the temperature of 2 moles of a monoatomic gas from 273 K...
- Rate of cooling of body is 0.2°C/min, when excess temperature is 20°C. The proportionality constant is
- Consider two hot bodies B_1 and B_2 which have temperatures 100°C to 80°C respectively at t = 0. The temperature of the...
- Half part of ice block is covered with black cloth and rest half is covered with white cloth and then it is kept in sunlight....
- Efficiency of a Carnot engine is 50% when temperature of outlet is 500 K. In order to increase efficiency up to 60% keeping...
- The volume of air increases by 5% in its adiabatic expansion. The percentage decrease in its pressure will be
- A body initially at 80°C cools to 64°C in 5 minutes and to 52°C in 10 minutes. The temperature of the body after 15 minutes will...
- A body takes 5 minutes for cooling from 50°C to 40°C. Its temperature comes down to 33.33°C in next 5 minutes. Temperature of...
- A cup of tea cools from 65.50°C to 62.50°C in one minute in a room of temperature 22.5°C. How long will the same cup of tea take...
- A cup of tea cools from 80°C to 60°C in one minute. The ambient temperature is 30°C. In cooling from 60°C to 50°C, it will take
- A pan filled with hot food cools from 50°C to 49.9°C in 5 s. If it cools from 40°C to 39.9°C in 10 s, then room temperature is
- A body cools at the rate of 0.75 °C/s, when it is 50°C above the surrounding. Its rate of cooling, when it is 30 °C above the...