AIIMS: Physics MCQs (PracticeTest 21 of 35)
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A single slit is used to observe diffraction pattern with red light. On replacing the red light with violet light the diffraction pattern would be

remain unchanged

become narrower

become broader

disappear


The thickness of a quarterwave plate made of quartz for wavelength l = 5000 A, refractive indices mE = 1.553 and m0 = 1.543 is

5.00 × 10 − 3 cm

3.75 × 10 − 3 cm

2.50 × 10 − 3 cm

1.25 × 10 − 3 cm


When unpolarised light gets reflected from a plane glass surface, it becomes partly polarized because glass

is optically active

rotates the components in the plane of incidence and those perpendicular to the plane of incidence by different amounts

reflects the components of light parallel to the plane of incidence and those perpendicular to it by different amounts

is a stereoisomer


If a quarter waveplate with its fast axis vertical is inserted into abeam of linearly polarized light oscillating at 450, then the emerging light will be

linearly polarized

vertically polarized

left circularly polarized

left elliptically polarized


In a FabryPerot interferometer the circular fringes formed are referred to as fringes of

equal thickness

equal inclination

equal chromatic order

None of the above


Scattering intensity of pure carbon tetrachloride is 6 units for 500. The scattering intensity for 4000 is

4.5 units

6.0 units

7.5 units

14.6 units


A substance shows a Raman frequency shift of 4000 cm1. If this mode is active in the infrared, then the corresponding infrared adsorption band will be at

0.5 m

1.0 m

1.5 m

2.5 m


The population inversion necessary for laser action used in solid state lasers is

electrical discharge

inelastic atomatom collision

direct conversion

optical pumping


A given amount of heat cannot be completely converted into work. How ever it is possible to convert a given amount of work completely into heat. This apparently contradictory statement results from the

zero th law of thermodynamics

first law of thermodynamics

second law of thermodynamics

third law of thermodynamics


The work done, W, during as isothermal process in which the gas expands from an initial volume V1 to a final volume V2 is given by (R: Gas constant, T: Temperature)

R (V2 − V1) loge (T1/T2)

R (T2 − T1) loge (V1/V2)

R T loge (V2/V1)

2 R T loge (V1/V2)


The combined form of first and second law of thermodynamics is given by (P: Pressure V: Volume, T: Temperature, U: Internal energy, S: Entropy, Q: Quantity of heat)

TdS = dU + PdV

dQ = TdS + PdV

dU = TdS + dQ

TdS = dUPdV


The temperature of water (mass, m) increases from T1 to T2. If C is the specific heat capacity of water, then the total increase in entropy of water is given by

mC (T2 − T1)

MC loge T1/T2

mC (T1 − T2)

mC loge T2/T1


Which one of the following Maxwell's relations leads to ClausiusClapeyron equation?

(T/V) S =  (p/S) V

(T/P) S = (V/S) P

(V/T) P =  (S/P) T

(S/V) T = (P/T) V


A perfect gas at 27 degree C is heated at constant pressure so as to doubles its volume. The temperature of the gas will now be

600 degree C

327 degree C

300 degree C

54 degree C


Consider the following processes that take place in a Carnet cycle:

Adiabatic expansion

Adiabatic compression

Isothermal expansion

Isothermal compression
The correct sequence of the above process is

1, 3, 4, 2

3, 1, 2, 4

3, 1, 4, 2

1, 3, 2, 4
