Related Questions

When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,
A α = 1, ρ = 0 and τ = 0
B α = 0, ρ = 1 and τ = 0
C α = 0, ρ = 0 and τ = 1
D α + ρ = 1 and τ = 0
The changes in the reflectivity/emissivity with time, is called:
A Spectral variation
B Spatial variation
C Temporal variation
D None of these
The sum of reflectivity and absorptivity for an opaque body is equal to
A 0.5
B 1
C 0
D 2
Smoking tells upon our body .Here 'tell upon' means ____ .
A benefits
B harms
C indicates
D strengthens
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is $$\tau $$. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be
A $$\frac{\tau }{2}$$
B $$\tau $$
C $$2\tau $$
D $$4\tau $$
The humidity of air depends upon-
A Weather
B Location
C Temperature
D All of the above
Intrauterine development of brain depends upon
A Folic acid
B Vitamin B12
C Zinc
D Iodine
E Vitamin C
Flank wear depends upon the
A hardness of the work and tool material at the operating temperature
B amount and distribution of hard constituents in the work material
C degree of strain hardening in the chip
D none of the mentioned
The specific cutting energy used for establishing the machinability of the metal depends upon its
A coefficient of friction
B micro-structure
C work hardening characteristics
D all of the mentioned
The size of a cam depends upon
A base circle
B pitch circle
C prime circle
D pitch curve

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