PHY101 Midterm Solved Subjective by Junaid Malik

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1. A generator supplies 100V to the primary coil of a transformer . the primary has 50 turns the secondary voltage is : 1000V 500V 250V 100V
2. Polarization experiments provide evidence that light is: A longitude wave A transverse wave Some type of wave Nearly monochromatic
3. The units of the plank constant h are those of : Energy Angular momentum Momentum Frequency
4. We desire to make an LC current that ascllates 100 Hz using an inductance of 2.5H . we also need a capacitance of 1 F 1mF 1uf 100uf
5. If energy of photon is E, it is equlvalent to mass: E/c^2 Ec^2 C^2/E Ec
6. The wave length of light beam A is twice the wavelength of light beam B. the energy of a photon in beam A is: Half the energy of photon in beam B One-forth the energy of a photon in beam B Equal to the energy of a photon in beam B

CS619 & CS519

Twice the energy of photon in beam B

7. The reaction of an induction at 50 Hz is 10 Ω, its reactance at 100Hz becomes: 20Ω 5Ω
8. 5Ω 1Ω
9. The wavelength of red light is 700 nm. Its frequency is
10. 29 x 10^3 Hertz 4,29 x 10^5 Hertz
11. 29 x 10^4 Hertz OR 4.29 x 10^14 Hertz
12. 29 x 10^2 Hertz

Laplace’s equation Reflection equation Refraction equation Bragg equation

10. A step-down transformer is used to : Increase the power Decrease the power Increase the voltage Decrease the voltage
11. The focal length of a spherical mirror is N times its radius of curvature where N is: ¼ ½
12. The appearance of colors in film is due to:

Diffraction Dispersion Polarization

13. Bending of light around the edges of an obstacle called: Refraction Polarization

Diffraction

14. In constructing a thermometer it is NECSSARY to use a substance that: Expends linearly with rising temperature Will not freeze Will not boil Undergoes some change when heated or cooled
15. In Young’s double slit experiment, the position of the bright fringe is given by: Ym=mU𝜆d Ym=mU𝛾d Ym=m𝜆d/L Ym=mLd𝜆
16. Constant-volume gas thermometers using di?erent gases all indicate nearly the same temperature when in contact with the same object if : The volume are all extremely large The volume are all the same The pressure are all extremely large The particle concentration are all extremely small
17. In meta stable state electrons reside: 10^-8 sec 10^-5 sec 10^-3 sec 10^-13 sec
18. Following are the ways by which light can interact with matter , EXCEPT: Emission

Absorption Transmission

19. In RL series circuit phase angle is given by: Tan-1(ꟺUR) Tan-1(R/ꟺL) Tan-1(ꟺLR) Tan-1(ꟺR/L)
20. The theoretical upper limit for the frequency of electromagnetic wave is : Just slightly greater than of red light Just slightly less than that blue light The greatest x-ray frequency There is no upper limit
21. The plants look green. It is because they have chlorophyl in them .chlorophyl make leaves green to absorb____________: Green Only Red only Blue only Red and blue both
22. Electric energy is measured: Kilowatt hour Kilowatt Horsepower Watt
23. The special theory of relativity is applicable to the object moving with maximum velocity equal to: Speed of light More than speed of light Less than speed of light Double the speed of light