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RGPV PH110 Practical MCQ | RGPV Physics Practical Objectives


1.         When the angle of the prism changes from 50 to 70 degree, then what happens to the minimum deviation?      
A.       Increased by 20 degree
B.        No change
C.        Decrease
D.       Increase

2.         A ray of the light travels from medium of refractive index N1 to a medium of refractive index N2 , if angle of incidents is ‘i’ and angle of refraction is ‘r’ then sin(i)/sin(r) = ?     
A.       N1      
B.         N2 
C.        N21
D.        N12

3.         Light travels __ in water than in air
A.       faster
B.        slower
C.        at the same speed
D.       perpendicular to

4.         Gas inside sodium vapour lamp         
A.       Helium           
B.        Mercury
C.        Neon  
D.       No gas

5.         A point source produces__________.           
A.       Cylindrical wavefront
B.        Spherical wavefront
C.        Plane wavefront         
D.       None of these

6.         When the path difference between the two light waves is integral multiples of wavelength, then the waves are said to be?             
A.       Out of phase  
B.        In phase
C.        Unaffected     
D.       Diffracted

7.         What is LASER?       
A.       Light Amplification by Stimulated Emission of Radiation
B.        Light Amplitude by Stimulated Emission of Radiation
C.        Light Ampliication by Stimulation Emission of Radiation
D.       Light Amplification and Stimulated Emission of Radiation

8.         Monochromatic light means:
A.         light that is only seen in black and white;
B.          light of all colours;
C.          light of one colour only;
D.         light that is outside the visible spectrum.

9.         What is the use of collimator?           
A.       It is used for focusing source light
B.        Use to get the parallel rays
C.        Diverge the source light
D.       Converge the source light

10.     Snell's law can be written as: 
A.       Sin(i)/Sin(r)=n2/n1     
B.        Sin(i)/Sin(r)=n1/n2
C.        Sin(r)/Sin(i)=n2/n1     
D.       Sin(r)/Sin(i)=1/(n1*n2)
Ans A

11.     How does the refractive index changes with wave length ? 
A.       Increase with increase in wave length
B.        Decrease with increase in wave length
C.        Remains constant
D.       Exponential decrease
12.     The wave length of green light in mercury spectrum is         
A.       546.1nm         
B.        235.36nm
C.        400.12nm       
D.       625.5nm
13.     A telescope's resolving power measures its ability to see
A.       fainter sources.
B.        more distnt sources.
C.        finer details in sources.
D.       larger sources.

14.     What process limits a telescope's resolving power?
A.       Reflection
B.        Refraction
C.        Diffraction
D.       Distraction

15.     The main advantage of a grating over Young's apparatus is the
A.       sharpness of the bright lines
B.        absence of dark fringes
C.        absence of bright fringes
D.       greater deviation of light

16.     A diffraction grating with a spacing of 15,000 lines/in. has a slit separation of
A.       6.67 x 10-6 in.
B.        5.9 x 10-3 cm
C.        3.81 μm
D.       1.69 x 10-4 cm
17.     Which one of these wave behaviours is not possible for longitudinal waves?
A.       Diffraction
B.        Reflection
C.        Refraction
D.       Polarisation
18.     A simple harmonic motion is the one where the force is proportional to
A.       displacement
B.        velocity
C.        Mass
D.       distance
19.     Acompound pendulum is
A.       a bar supported at two knife edges
B.        a rigid body capable of oscillating in vertical plane
C.        a bar supported at four knife edges
D.       a bar supported at six knife edges

20.     Are the centre of suspension and centre of oscillation in a Bar pendulum interchangeable?
A.       yes
B.        no
C.        In some special case
D.       None of these
21.     The word photovoltaic comes from words meaning:
A.       wind energy
B.        brightness
C.        light and electricity
D.       picture which moves
22.     Developing solar energy is important because it:
A.       does not produce pollution
B.        can be utilized in most regions of the U.S.
C.        reduces our dependency on imported energy
D.       all of the above
23.     Electronic distribution of a Si atom is
A.       2, 10, 2
B.        2, 8, 4
C.        2, 7, 5
D.       2, 4, 8.
24.     Semiconductor materials have ................. bonds.
A.       ionic
B.        covalent
C.        mutual
D.       metallic.

25.     The process of adding impurities to a pure semiconductor is called
A.       mixing
B.        doping
C.        diffusing
D.       refining.

26.     The leakage current of a P-N diode is caused by
A.       heat energy
B.        chemical energy
C.        barrier potential
D.       majority carriers.
27.     Any voltage that is connected across a P-N junction is called ............. voltage.
A.       breakdown
B.        barrier
C.        bias
D.       reverse.
28.     Principle behind optical fibers?   
A.       Reflection     
B.        Refraction
C.        Total internal reflection     
D.       Diffraction

29.     Light is confined within the core of a simple optical fiber by
A.       refraction.   
B.        total internal reflection at the outer edge of the cladding.
C.        total internal reflection at the core cladding boundary.
D.       reflection from the fiber's plastic coating.
30.     Which of the following is not a reason to use fiber-optic cables for point to point data transmission?
A.       Need to assure data security. 
B.        Avoidance of ground loops.
C.        Data-transfer rates too low to use metal cables. 
D.       Elimination of spark hazards.

31.     Which of the following is NOT a reason to use flexible optical circuits?
A.       Low loss distribution. 
B.        Protection of fiber. 
C.        Small size. 
D.       Compact and bend easily.
32.     The light sources used in fibre optic communication are.  
A.       LEDs   
B.        semiconductor lasers
C.        Phototransistors 
D.       both a and b
33.     Acceptance angle formula is
A.       Sinq (N1-N2)
B.        Sin-1(Ö(N21-N22))
C.        Cos-1(Ö(N21-N22)) 
D.       None of these
34.     Numerical aperture formula is:
A.       (Ö(N21-N22)/N0)
B.        (N21-N22)   
C.        Sin-1(Ö(N21-N22)) 
D.       None of these
35.     The experiment which directly determines both the sign and density of charge carriers in a sample material is. 
A.       Four probe method
B.          Hall Experiment 
C.         Quincke's method
D.        None of these

36.     If a current carrying conductor placed in a perpendicular magnetic field, a potential difference will generate in the conductor which is perpendicular to both magnetic field and current. This phenomenon is called        
A.       Peltier effect
B.        Joule effect 
C.        Thomson effect  
D.       Hall effect

37.     The quantity 1/(ne) where 'n' is the number density of charge carriers and 'e' is the electric charge represents.   
A.       Thomson effect
B.        Joule effect  
C.        Hall coefficient 
D.       Peltier effect

38.     Negative Hall coefficient indicates that the charge carriers are.         
A.       Holes 
B.        Electrons 
C.        Both holes and electrons  
D.       None of the above

39.     Wave nature of light is evidenced by
A.       Photo-electric effect
B.        Interference
C.        black body radiation
D.       Nuclear emission
40.     In Netwon’s rings, interference is due to light rays reflected from
A.       lower surface of lens and upper surface of glass plate.
B.        lower surface of glass plate and upper surface of lens.
C.        lower surface of lens and lower surface of glass plate.
D.       upper surface of lens and upper surface of glass plate.
41.     Newton ring Experiments works under the principle of        
A.       Diffraction of light.   
B.        Polaristion of light.
C.        Interference of light.  
D.       None of the above
42.     In reflected light the central fringe of Newton’s ring is
A.       dark
B.        non-uniform
C.        bright
D.       none of them
43.     In Newton’s ring experiment properties can be measured.
A.       Wavelength of light
B.        Thickness of the film
C.        Refractive index of liquid
D.       All the above
44.     The spacing between the Newton’s ring ______ with the increase of the order of the ring.
A.       Increases
B.        Decreases
C.        Remains same
D.       None of these
45.     Light waves are
A.       longitudinal waves
B.        transverse waves
C.        both A and B
D.       none of them
46.     Maximum number of orders available with a grating is
A.       directly proportional to the wavelength
B.        inversely proportional to the grating element
C.        independent of grating element
D.       directly proportional to the grating element.
47.     In a single slit experiment if the slit width is reduced
A.       the fringes becomes brighter
B.        the fringes becomes narrower
C.        the fringes becomes wider
D.       the colour of the fringes change
48.     The condition of minima for grating
A.       N (a + b) sin θ = mλ
B.        (a + b) sin θ = mλ
C.        (a + b) sin θ = m N λ
D.       N (a + b) cos θ = m λ
49.     In Fraunhofer diffraction, the diffracted wavefront is
A.       Plane
B.        Spherical
C.        Cylindrical
D.       None of these
50.     When white light is incident on a diffraction grating, the light diffracted more will be
A.       blue
B.        yellow
C.        violet
D.       red
1.         D   2.         C    3.         B    4.         C    5.         B      6.         B       7.         A    8.         C   9.         B  10.     A
11.     B   12.     A   13.     C    14.     C    15.     A      16.     D        17.     D   18.     A   19.     B   20.     A
21.     C   22.     A   23.     B    24.     B    25.     B      26.     A        27.     C   28.     C   29.     C  30.     C
31.     C    32.     D  33.     B    34.     A    35.     B      36.     D       37.     C    38.     B   39.     B  40.     A
41.     C    42.     A  43.     D    44.     B    45.     B      46.     D       47.     B    48.     A   49.     A  50.     D
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