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. 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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2. 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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3. Which of the following is not true of an electrostatic force?
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4. The study of static charges is called ---------------------------
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5. A body that absorbs all radiations falling on it is known as ---------------------------.
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6. The energy stored in a system of charges is known as electrostatic potential ---------------------------
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7. A region where an electric charge experiences a force is ---------------------------field
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8. In the method of charging by friction, The algebraic sum of the individual charges that is the net charge is ---------------------------.
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9. 1 volt is equal to ________
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10. When a charge density depends only on the perpendicular distance from a plane, the charge distribution is said to have--------------------------- symmetry.
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11. The variation of the compass from the north-south direction is called the ---------------------------
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12. <p style="text-align:left">Six equal point charges Q = 10nC are located at 2,3, 4,5,6,7m. Find the potential at origin.
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13. 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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14. At the _______ a dipping compass needle is horizontal and at the magnetic poles it is vertical.
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15. 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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16. In the circuit shown, each of the cells has an emf of 2V and internal resistance of $0.1Omega$. Find the current in through the $0.5Omega$
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17. 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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18. Field lines are drawn such that the lines per unit cross-section area is proportional to ---------------------------field.
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19. The force between electric charges is known as ---------------------------
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20. An electric field of 50 kV/m is perpendicular to a magnetic field 0.25 T. What is the velocity of a charge whose initial of motion is perpendicular to both fields and which passes through the fields undeflected?
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21. 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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22. 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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23. A series circuit consisting of an uncharged $42mu$F capacitor and $10 MOmegaega$ resistor is connected to 100V power source. What are the current in the circuit and the charge on the capacitor after one time constant?
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24. 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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25. Calculate the electric field at distance of 320 cm from an infinitely long wire carrying a charge per unit length 8.3 C/m.
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26. If the steady current in a wire is coming directly toward you, the magnetic field lines
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27. The force that is responsible for holding electrons to nuclei to form atoms is called the --------------------------- force
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28. According to ohm's law the potential difference is proportional to the ---------------------------
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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. 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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31. The resistivity of a semiconductor decreases rapidly with increasing ---------------------------.
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32. A uniform electric field of 200 N/C is in the x-direction. A point charge of 3mu{C} is released from rest at the origin. What is the kinetic energy of the charge when it is at x = 4 m?
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33. When beta decay occurs --------------------------- changes into a proton and electron.
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34. The electric flux is a --------------------------- quantity.
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35. Kirchhof's junction rule is statement of conservation of -----------
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36. 1eV is the energy acquired by an electron in falling freely through --------------------------- 1volt.
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37. 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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38. In the space surrounding a wire carrying a steady current, there exists ________
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39. 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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40. In the cathode ray oscilloscope, when fast moving electrons strike the glass screen coated with zinc and sulphide they cause ---------------------------.
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41. When a dielectric material is inserted between the plates of a capacitor it increases its ---------------------------
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42. The magnitude of the forces between charged spheres was first investigated by Charles ---------------------------
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43. 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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44. 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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45. The magnetic North is found by suspending a bar magnet freely on the --------------------------- axis.
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46. When an atom is in the ground state it is said to be ---------------------------
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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. The --------------------------- number is the total number of neutrons and protons.
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49. The term 'lost volts' refers to -----------
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50. The minimum energy required to liberate an electron from a metal surface is called ---------------------------.
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