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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

The Dimensions of Emissive Power - Physics

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प्रश्न

The dimensions of emissive power are

पर्याय

  • [M1 L-2 T-3 ]

  • [M1 L2 T-3 ]

  • [M1 L0 T-3 ]

  • [M1 L0 T-2 ]

MCQ

उत्तर

(C) [M1 L0 T-3 ]

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
2014-2015 (October)

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संबंधित प्रश्‍न

A pinhole is made in a hollow sphere of radius 5 cm whose inner wall is at temperature 727oC. Find the power radiated per unit area. [Stefan’s constant σ = 5.7 x 10-8 J/m2 s K4 , emissivity (e) = 0.2]


A metal ball cools from 64 °C to 50 °C in 10 minutes and to 42 °C in next 10 minutes. The ratio of rates of fall of temperature during the two intervals is _______.


What is the temperature of the triple-point of water on an absolute scale whose unit interval size is equal to that of the Fahrenheit scale?


1000 tiny mercury droplets coalesce to form a bigger drop. In this process, temperature of the drop _______ .

(A) increases

(B) may increase or decrease

(C) decreases

(D) does not change


The susceptibility of magnesium at 300K is 1.2 x 10-5. At what temperature will the susceptibility increase to 1.8 X 10-5?


Does the temperature of a body depend on the frame from which it is observed?


It is said that mercury is used in defining the temperature scale because it expands uniformly with  temperature. If the temperature scale is not yet defined, is it logical to say that a substance expands uniformly with temperature?


Which of the curves in the following figure represents the relation between Celsius and Fahrenheit temperatures?


The temperature of water at the surface of a deep lake is 2°C. The temperature expected at the bottom is


A spinning wheel is brought in contact with an identical wheel spinning at identical speed. The wheels slow down under the action of friction. Which of the following energies of the first wheel decreases?

(a) Kinetic
(b) Total
(c) Mechanical
(d) Internal


Is heat a conserved quantity?


A body A is placed on a railway platform and an identical body B in a moving train. Which of the following energies of B are greater than those of A, as seen from the ground?
(a) Kinetic
(b) Total
(c) Mechanical
(d) Internal


As the temperature is increased, the time period of a pendulum


The atmospheric temperature in the cities on sea-coast change very little. Explain


Water equivalent of a body is measured in ___________ .


The mechanical equivalent of heat ____________ .


The temperature of a solid object is observed to be constant during a period. In this period

(a) heat may have been supplied to the body

(b) heat may have been extracted from the body

(c) no heat is supplied to the body

(d) no heat is extracted from the body


A steel rod of length 1 m rests on a smooth horizontal base. If it is heated from 0°C to 100°C, what is the longitudinal strain developed?


A steel ball that is initially at a pressure of 1.0 × 10Pa is heated from 20°C to 120°C, keeping its volume constant.
Find the pressure inside the ball. Coefficient of linear expansion of steel = 12 × 10–6 °C–1and bulk modulus of steel = 1.6 × 1011 Nm–2.


Temperature and Heat are ______


Our normal body temperature is ______.


Two tumblers of A and B have water at 50°C temperature. If the water from A and B is poured into tumbler C. The temperature of C is ______.


Heat is measured in Celsius or centigrade.


The degree of hotness and coldness of a body is called ______.  


Two identical beakers A and B contain equal volumes of two different liquids at 60°C each and is left to cool down. Liquid in A has a density of 8 × 102 kg/m3 and specific heat of 2000 J kg-1 K-1 while the liquid in B has a density of 103 kg m-3 and specific heat of 4000 J kg-1 K-1. Which of the following best describes their temperature versus time graph schematically? (assume the emissivity of both the beakers to be the same.)


Heat given to a body that raises its temperature by 1°C is ______.


The temperature of a liquid drops from 365 K to 361 K in 2 min. Find the time during which the temperature of the liquid drops from 344 K to 342 K.

(Take, room temperature = 293 K)


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