A body takes 5 minute for cooling from 50⁰C to 40⁰C. Its temperature comes down to 33.33⁰C in next 5 minute. Temperature of surroundings is
Options
(a) 15⁰C (b) 20⁰C (c) 25⁰C (d) 10⁰C
Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature t⁰C, the power received by a unit surface, (normal to the inicident rays) at a distance […]
An ideal black body is equivalent to
Options
(a) Hot sodium lamp (b) Tungsten filament (c) Hot lampblack (d) Small hole in a hollow sphere
Correct Answer:
Small hole in a hollow sphere
Explanation: […]
If the cold junction of a thermo-couple is kept at 0⁰C and the hot junction is kept at T⁰C then the relation between neutral temperature (Tₙ) and temperature of inversion (Ti) is
Options
(a) […]
A body is placed in an insulating container at temperature 227⁰C. In order to keep its temperature at 727⁰C, power of 60 watt is required. Then power required to keep its temperature at 1227⁰C will […]
A body of length 1 m having cross-sectional area 0.75 m² has heat flow through it at the rate of 6000 joule/sec. Then find the temperature difference if K=200 Jm⁻¹K⁻¹
Options
(a) 20⁰C (b) […]
Which of the following statements is correct?
Options
(a) A good absorber is a bad emitter (b) Every body absorbs and emits radiations at every temperature (c) The energy of radiation emitted from a […]
Which of the following is true for elastic potential energy density?
Options
(a) Energy density=1/2 x strain x stress (b) Energy density= (strain)² x volume (c) Energy density= strain x volume (d) Energy density […]
Which is correct relation?
Options
(a) Y<σ (b) Y>σ (c) Y=σ (d) σ=±1
Correct Answer:
Y>σ
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting below.
Stress to strain ratio is equivalent to
Options
(a) Modulus of rigidity (b) Poisson’s ratio (c) Reynold number (d) Fund number
Correct Answer:
Modulus of rigidity
Explanation:
No explanation available. Be the first to […]
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