MHT CET questions
29293 published questions with worked solutions.
- The luminousity of a star is10000 times that of the sun. If the surface temperature of the sun is 6000 K, then the surface...
- A black body at temperature 227 °C radiates heat at the rate of 5 cal/cm^2 s, at a temperature of 27°C, the rate of heat radiated...
- A solid sphere cools at the rate of 2.8°C per minute, when its temperature is 127°C. Find the rate at which another solid copper...
- The ratio of the rate of radiation of heat by a perfectly black body at a temperatures 527°C and 127°C is
- A black body radiates 3 J/cm^2 s when its temperature is 127°C. How much heat will be radiated cm^2 s when its temperature is...
- If the temperature of a hot body is increased by 50 %, then amount of radiant energy emitted by it increases approximately by
- A 60 w bulb has a filament temperature of 2000 K°. What will be the wattage of another bulbs of same filament area and material...
- The radiant energy from the sun, incident normally at the surface of the earth is 30 kcal/m^2. min. What would have been the...
- A perfect black body emits radiation at the rate of 11.34 watt/cm^2. Its temperature is ( = 5.67 10^ -8 watt/m^2-K^4)
- The energy emitted by a black body at 727°C is E. If the temperature of the body is increased to 2227°C, then the emitted energy...
- A black body radiates 6 J/cm^2-s, when its temperature is 127°C. How much heat will be radiated per square centimetre per second,...
- The ratio of energy of emitted radiation of a black body at 27°C and 1227°C is
- Two perfectly black bodies A and B, having the same surface area are heated to the temperatures 527°C and 127°C respectively and...
- A metal ball of surface area 200 cm^2 and temperature 527°C is surrounded by a vessel at 27°C. If the emissivity of the metal is...
- 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...
- The temperature of filament of a bulb is 350 K and amount of heat radiated is 'u'. If the filament is supposed to be a black...
- An object is at temperature of 400°C. At what temperature it would radiate energy twice as fast as initial rate? The temperature...
- Two bodies A & B have thermal emissivity's of the 0.16 & 0.81 resp. The outer surface areas of two bodies are same. The two...
- The energy radiated in one minute by a perfectly black body of surface area 300 cm^2, when its temperature is 227°C is (Stefan's...
- Two spheres P and Q of the Same colour having radii 8 cm and 2 cm respectively are maintained at temperatures 127°C and 527°C...