A.? = 0
B.? = 1
C.? = 0
D.? + ? = 0
Related Mcqs:
- Suppose that the transmissivity is zero for a very thick piece of material. If the material is perfectly black where ? = absorptivity and ? = reflectivity
- Suppose that we have an ideal piece of glass with ? = 0. If ? = 0.09 where ? = transmissivity ? = reflectivity and ? = absorptivity
- If the absorptivity plus reflectivity of a body equals 1, then the body is known as
- The rate of heat flow from a 50 mm thick wall of material having thermal conductivity of 40 W/m?C for a temperature difference of 10?C will be
- Suppose it is a winter night and at about 11 p.m., the air cools to the dew-point temperature and a thick radiation fog develops. If the air continues to cool during the night, in 5 hours the dew point temperature will probably __________.
- For punching a hole of 25 mm diameter in a plate 20 mm thick, if the shear stress of plate material is 30 kg/mm2, the force required would be
- A steel piece after hardening is heated to 300?C and then cooled in oil. The property imparted to the steel piece will be
- A piece of paper wrapped tightly on a copper rod will get charred relatively slowly when held over a flame as compared to a piece of paper wrapped tightly on any of the following rod except:
- A gas which obeys kinetic theory perfectly is known as
- For perfectly elastic bodies, the value of the coefficient of restitution is
