A white light when passed through prism is Deviated Dispersed None of these Answer: Dispersed
40 dB + 44 dB = ? 40 dB 41 dB 44 dB 45 dB Answer: 45 dB
A string fixed at both ends forms standing waves with node separation of 10 cm. If the velocity of waves traveling time string is 4 m/s, then the frequency or vibration of the string will be_______ 20 Hz 40 Hz 10 Hz 1 Hz None of these Answer: 20 Hz
If the focal length of convex lens is 50cm, then its power is +2D -2D -5D None of these Answer: +2D
In Young’s double slit experiment, fringe spacing will be minimum if we use Blue light Red light yellow light green light Answer: Blue light
To get more orders of spectra using a diffraction grating, the wavelength should be Increased Decreased None of these Answer: Decreased
When a ray of light passes from rarer to denser medium , its _ remains same but changes Wavelength, Frequency Frequency, Wavelength Answer: Frequency, Wavelength
The dimension of angular magnification is same as that of frequency angular displacement resolving power Both (b) and (c) None of these Answer: Both (b) and (c)
In telescope, an objective of __ focal length is used. Long Short Answer: Long
Length of telescope is 1 – fo/fe (1 + fo/fe)fe fo/fe None of these Answer: (1 + fo/fe)fe
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 Answer: 1000 nm
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 Answer: F/2
If mean square velocity of gas molecules doubled then pressure of gas double becomes four time remains same None of these Answer: double
The specific heat of a gas in an adiabatic process is: Infinity Zero None of these Answer: Zero
In which process the P-V diagram is a straight line parallel to pressure axis: Isobaric Isochoric Iso-thermal None of these Answer: Iso-thermal
For mono atomic gas Cp = 5R/2, then the value of Cv is 3R/2 7R/2 R None of these Answer: 3R/2
The P.E. for an ideal gas law is: Equal to K.E. Zero Equal to T.E. None of these Answer: Zero
If the temperature of the sink increases then the efficiency of the Carnot engine Increases Decreases Remains same None of these Answer: Decreases
The efficiency of heat engine whose sink is at 27 C and source is at 327 C is: 30% 50% 75% None of these Answer: 50%
For an ideal gas, the product of temperature and density is equal to: PMR PM/R R/PM None of these Answer: PM/R
The process in which the internal energy of the system remains constant is : adiabatic isothermal isobaric None of these Answer: isothermal
In free expansion of a gas the internal energy of the system Increases Decreases is unchanged None of these Answer: is unchanged
Most of the natural processes are? Reversible Irreversible Answer: Irreversible
Doppler effect is independent of: velocity of source velocity of listener distance between source and observer None of these Answer: distance between source and observer
Spectrometer is used to measure: refractive index of material of a prism angle of prism. dispersion. All of these Answer: All of these
