GATE PH discipline:physics PYQs & Answers — Page 59 — Exam Papers

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Questions 581–590 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 59 of 65

An air-conditioner maintains the room temperature at 27 °C while the outside temperature is 47 °C. The heat conducted through the walls of the room from outside to inside due to temperature difference is 700 W. The minimum work done by the compressor of the air-conditioner per unit time is ______ W.

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Two solid spheres A and B have same emissivity. The radius of A is four times the radius of B, and temperature of A is twice the temperature of B. The ratio of the rate of heat radiated from A to that from B is ______.

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The partition function of an ensemble at a temperature

is

where

is the Boltzmann constant. The heat capacity of this ensemble at

is

, where the value of X is ______ (up to one decimal place).

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An atom in its singlet state is subjected to a magnetic field. The Zeeman splitting of its 650 nm spectral line is 0.03 nm. The magnitude of the field is ______ Tesla (up to two decimal places).

(

)

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The quantum effects in an ideal gas become important below a certain temperature

when de Broglie wavelength corresponding to the root mean square thermal speed becomes equal to the inter-atomic separation. For such a gas of atoms of mass

kg and number density

,

(up to one decimal place).\n\n(

)

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Identical charges

are placed at five vertices of a regular hexagon of side

. The magnitude of the electric field and the electrostatic potential at the centre of the hexagon are respectively

Your answerChoose one option.

A.

B.

C.

D.

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A parallel plate capacitor with square plates of side 1 m separated by 1 micro meter is filled with a medium of dielectric constant of 10. If the charges on the two plates are 1 C and -1 C, the voltage across the capacitor is ______ kV. (up to two decimal places). (

F/m)

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Light is incident from a medium of refractive index

onto vacuum. The smallest angle of incidence for which the light is not transmitted into vacuum is ______ degrees. (up to two decimal places).

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A monochromatic plane wave in free space with electric field amplitude of 1 V/m is normally incident on a fully reflecting mirror. The pressure exerted on the mirror is ______

Pa. (up to two decimal places) (

F/m).

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The best resolution that a 7 bit A/D converter with 5 V full scale can achieve is ________ mV. (up to two decimal places).

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