To get more orders of spectra using a diffraction grating, the wavelength should be? Increased Decreased None of these
When a ray of light passes from rarer to denser medium , its _ remains same but changes? Wavelength, Frequency Frequency, Wavelength
The dimension of angular magnification is same as that of? frequency angular displacement resolving power Both (b) and (c) None of these
In telescope, an objective of __ focal length is used.? Long Short
Length of telescope is? 1 – fo/fe (1 + fo/fe)*fe fo/fe None of these
When one mirror of a Michelson Interferometer is moved a distance 1 mm observe 2000 fringes what will be the wavelength of light? 500 nm 1000 nm 2000 nm None of these
Two convex lenses of equal focal length are placed in a contact. What is the resultant focal length of this combination?? 2F F/2 4F F None of these
If mean square velocity of gas molecules doubled then pressure of gas? double becomes four time remains same None of these
The specific heat of a gas in an adiabatic process is:? Infinity Zero None of these
In which process the P-V diagram is a straight line parallel to pressure axis:? Isobaric Isochoric Iso-thermal None of these
For mono atomic gas Cp = 5R/2, then the value of Cv is? 3R/2 7R/2 R None of these
The P.E. for an ideal gas law is:? Equal to K.E. Zero Equal to T.E. None of these
If the temperature of the sink increases then the efficiency of the Carnot engine? Increases Decreases Remains same Remains same
The efficiency of heat engine whose sink is at 27 C and source is at 327 C is:? 30% 50% 75% None of these
For an ideal gas, the product of temperature and density is equal to:? PMR PM/R R/PM None of these
The process in which the internal energy of the system remains constant is 😕 adiabatic isothermal isobaric None of these
In free expansion of a gas the internal energy of the system? Increases Decreases is unchanged None of these
Most of the natural processes are?? Reversible Irreversible
Doppler effect is independent of:? velocity of source velocity of listener distance between source and observer None of these
Spectrometer is used to measure:? refractive index of material of a prism angle of prism. dispersion. All of these
