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. The magnetic flux through each loop of a 35-loop coil is given by $(3.6t-0.71t^{3})times10^{-2}Tm^{2}$, where the time is in seconds. Determine the induced emf at t=5.0s.
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2. The surface integral of the electric field E over a surface is defined to be electric ---------------------------
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3. An alpha particle is a --------------------------- nucleus consisting of 2 protons and 2 neutrons.
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4. 1 volt is equal to ________
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5. The half-life of a certain radioactive isotope is 32 hours. What fraction of the sample would remain after 16 hours?
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6. The resistivity of a semiconductor decreases rapidly with increasing ---------------------------.
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7. The term 'lost volts' refers to -----------
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8. For capacitors connected in series each has the same ____________.
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9. In the method of charging by friction, The algebraic sum of the individual charges that is the net charge is ---------------------------.
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10. Neutral objects constitute of equal ---------------------------
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11. The energy stored in a system of charges is known as electrostatic potential ---------------------------
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12. An RLC circuit is used to tune a radio set to receive NOUN RADIO broadcasting at 105.9MHz in the FM band. The resistance and the inductance of the circuit of the radio set are $12Omega$ and 1.4$mu$H respectively. What capacitance should the circuit have?
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13. Two identical balls balls P and Q, each of mass 0.20 g, carry identical charges and are suspended by two threads of equal length. The balls position themselves at equilibrium such that the angle between the threads is 60_{o}.If the distance between the the balls is 0.5m, find the charge on each of them. Take g = 9.8 m/s^{2}
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14. A magnetic field does not exert a force on a _________
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15. In the space surrounding a wire carrying a steady current, there exists ________
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16. 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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17. A rectangular coil of dimensions 20 cm by 15 cm lies with its plane parallel to a magnetic field of $ 0.5 W/$m^{2}$. The coil, carrying a current of 10 A experiences a torque of 4.5 Nm in the field. How many loops has the coil?
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18. A huge spark due to electric discharge in the atmosphere produces all of the following except ______
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19. For capacitors in parallel, the potential difference across each capacitor is ---------------------------
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20. According to ohm's law the potential difference is proportional to the ---------------------------
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21. Whose law is employed in electrostatics ?
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22. If the steady current in a wire is coming directly toward you, the magnetic field lines
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23. 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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24. The force that is responsible for holding electrons to nuclei to form atoms is called the --------------------------- force
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25. A body that absorbs all radiations falling on it is known as ---------------------------.
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26. Kirchhof's junction rule is statement of conservation of -----------
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27. Gauss's law applies to any hypothetical closed surface called --------------------------- surface.
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28. For capacitors in parallel, the potential difference across each capacitor is ---------------------------
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29. Electric flux density is a function of ---------------------------
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30. The potential difference between two points B and A is equal to the --------------------------- in taking a unit positive charge from A to B.
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31. 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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32. 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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33. When a dielectric material is inserted between the plates of a capacitor it increases its ---------------------------
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34. Potential difference is the work done in moving a unit charge ____ from one point to another in an electric field.
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35. From Gauss’ law which of the following is NOT correct?
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36. Find the current in through the $0.3Omega$ in the circuit shown
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37. What is the self - inductance of an air-core solenoid, 1m long and 0.05m in diameter, if it has 1400 turns?
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38. Electric field is measured in Newton per ---------------------------.
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39. A region where an electric charge experiences a force is ---------------------------field
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40. Electric charge between two bodies can be produced by ---------------------------
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41. The minimum energy required to liberate an electron from a metal surface is called ---------------------------.
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42. 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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43. The variation of the compass from the north-south direction is called the ---------------------------
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44. 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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45. A conductor 2cm long carrying a current of 8A lies at right angles to a magnetic field of which the flux density is 1.0T. Calculate the force exerted on the conductor
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46. Which of the following is not true about the electric field intensity $vec{E}$ of a uniformly charged solid sphere?
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47. A positively charged object repels
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48. Property of magnetic material in which --------------------------- attracts or repels.
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49. 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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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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