ATTENTION:
Kindly note that you will be presented with 50 questions randomized from the NOUN question bank. Make sure to take the quiz multiple times so you can get familiar with the questions and answers, as new questions are randomized in each attempt.
Good luck!
PHY102
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1. Whose law is employed in electrostatics ?
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2. An ammeter is suspected of giving inaccurate readings. In order to confirm the readings, the ammeter is connected to a silver votltameter in series and a steady current is passed for one hour. The ammeter reads 0.56A and 2.0124g of silver is deposited. What is the error is the ammeter reading?
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3. What are the dimensions of the constant k in Coulomb’s law of electrostatics?
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4. Three point charges $$2mu{C$}, ${-}4mu{C}$$, and $$6mu{C}$$ are held at the corners of an equilateral triangle with sides equal to 3 cm.What is the resultant force in newtons on the $$2mu{C}$$ charge?
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5. Electric charge between two bodies can be produced by ---------------------------
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6. As charge increases, electric flux density ---------------------------
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7. In the space surrounding a wire carrying a steady current, there exists ________
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8. The magnetic North is found by suspending a bar magnet freely on the --------------------------- axis.
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9. Potential difference is the work done in moving a unit charge ____ from one point to another in an electric field.
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10. An ac circuit consists of a voltage source $v = 200sin120pi{t}$ and a $6mu$F capacitor in series. Calculate the current established in the circuit
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11. In the cathode ray oscilloscope, when fast moving electrons strike the glass screen coated with zinc and sulphide they cause ---------------------------.
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12. Kirchhof's loop rule is statement of conservation of __________
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13. The minimum energy required to liberate an electron from a metal surface is called ---------------------------.
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14. The --------------------------- number is the total number of neutrons and protons.
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15. An electron enters a uniform magnetic field 0.20 T at an angle of $30^{o}$ the field. Determine the pitch of the helical path assuming its speed is $3times10^{7}$ m/s
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16. The electric flux is a --------------------------- quantity.
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17. The study of static charges is called ---------------------------
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18. A charge distribution in which the charge density at any point depends only on the distance of the point from a central point and not on the direction is said to be spherically ---------------------------
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19. A positively charged object repels
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20. A potentiometer wire of length 100cm has a resistance of 10$Omega$. It is connected in series to to a resistance R and a cell of emf 2V and negligible internal resistance. A source of emf of 10mV is balanced by a length of 40cm of the potentiometer wire. What is the value of the resistance R?
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21. A galvanometer of resistance $120Omega$ a full scale deflection with a current of 0.0005A. How would you convert it to an ammeter that reads a maximum current of 5A?
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22. The surface integral of the electric field E over a surface is defined to be electric ---------------------------
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23. The electric potential difference between two points A and B is 42 V. What is the work done by an external agent in carrying a charge of 5.0$times 10^{-5}$ C from A to B at constant speed?
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24. A body that absorbs all radiations falling on it is known as ---------------------------.
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25. The following are true about electric field lines except that they ______
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26. For capacitors in parallel, the potential difference across each capacitor is ---------------------------
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27. Electric field is measured in Newton per ---------------------------.
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28. When amber is rubbed with fur
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29. The work function of a metal is 3.45eV. Calculate th maximum wavelength of a photon that can eject photo-electrons from the metal
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30. When an atom is in the ground state it is said to be ---------------------------
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31. Charges of ${+}2$ C and ${-2}$ C are situated at points P and Q respectively which are at a distance apart. A point X is mid-way between P and Q. Which of the following correctly describes the electric field and the electric potential at point X?
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32. From Gauss’ law which of the following is NOT correct?
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33. The variation of the compass from the north-south direction is called the ---------------------------
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34. According to Faraday's law, the magnitude of the induced e.m.f is proportional to the rate of change of --------------------------- linking the circuit.
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35. A spectral line is emitted when an atom undergoes transition between two levels with a difference in energy of 2.4eV. What is the wavelength of the line?
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36. A tiny ball of mass 0.60 g is suspended from a rigid support with a piece of thread in a horizontal electric field of intensity 700 N/C. The ball is in equilibrium when the thread is inclined at an angle of 20_{o} to the vertical. What are the magnitude and sign of the charge on the ball? Take g = 9.8m/s^{2}
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37. When a copper surface is illuminated by radiation of wavelength 2537 angstrome units the value of the stopping potential is found to be 0.24volts. Calculate the work function of copper.
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38. A magnetic field does not exert a force on a _________
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39. A proton is accelerated through a potential difference of 100V and the enters a region in which it is moving perpendicular to a magnetic field of flux density 0.20 T. Find the radius of the circular path in which it will travel.
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40. The work done in taking a unit positive charge from one point to another in electric field is --------------------------- of the path chosen between the two points.
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41. The --------------------------- is the SI Unit of electric charge
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42. According to ohm's law the potential difference is proportional to the ---------------------------
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43. The magnitude and direction of the earth's field varies with position over the --------------------------- surface.
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44. An air-cored transformer is assumed to be 100% efficient. The ratio of the secondary turns to the primary turns is 1:20. A 240V ac supply is connected to the primary coil and a $6Omega$ load is connected to the secondary coil. what is the current in the primary coil?
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45. A single turn coil of cross-sectional area $7.2cm^2$ is in the a magnetic field of flux desity 0.45T. The field which is perpendicular to the coil, is steadily reduced to 0.0T in 5s. Calculate the induced emf.
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46. Gauss's law applies to any hypothetical closed surface called --------------------------- surface.
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47. An RLC circiut contains an ac voltage source with rms value of 50V and has a frequency of 600Hz. Suppose that a resistance R = 20 $Omega$, capacitance C = 10.0 $mu$F and an inductance L = 4.0mH are connected in series to the source. Find the current in the circuit and the voltmeter reading across the inductor.
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48. For capacitors in parallel, the potential difference across each capacitor is ---------------------------
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49. The force applied to a conductor is 10N if the charge in the conductor is 5C, what is the electric field intensity?
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50. Which of the following can be used to charge a metal rod that si held in your hand? Rub it with ______
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