PHY102

Category: PHY102

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. If the steady current in a wire is coming directly toward you, the magnetic field lines

A. circle the wire in the clockwise direction

B. circle the wire in the counterclockwise direction

C. point radially outward

D. point radially inward

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2. A huge spark due to electric discharge in the atmosphere produces all of the following except ______

A. gamma radiation.

B. Rapid expansion of surrounding air

C. Lightning

D. shock waves

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3. 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}

A. $3.2\times10^{-6}$ C

B. $4.2\times10^-{6}$ C

C. ${-}3.1\times10^{-6}C

D. ${-}4.1\times10^{-3}$C

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4. The following are true about electric field lines except that they ______

A. are discontinuous and may terminate in a vacuum

B. do not intersect one another

C. are drawn such that the magnitude of the field is proportional to the number of lines crossing a unit area perpendicular to the lines

D. give the direction of motion of a unit positive test-charge under the action of the electrostatic force

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5. 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.

A. 0.13A and 12.1V

B. 4.0A and 23.1V

C. 2.17A and 32.8V

D. 1.6A and 24.2V

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6. 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?

A. $40\vec{i}-63.7\vec{j}$

B. ${-}80\vec{i}+69.3\vec{j}$

C. $80\vec{i}-69.3\vec{j}$

D. ${-}40\vec{i}+63.7\vec{j}$

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7. Electric field is measured in Newton per ---------------------------.

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8. The magnitude of the forces between charged spheres was first investigated by Charles ---------------------------

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9. 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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10. The work function of a metal is 3.45eV. Calculate th maximum wavelength of a photon that can eject photo-electrons from the metal

A. $1.6\times10^{-6}$m

B. $3.4\times10^{-7}$m

C. $2.4\times10^{-8}$m

D. $3.6\times10^{-7}$m

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11. Find the current in through the $0.3Omega$ in the circuit shown

A. 2.15A

B. 3.27A

C. 1.33A

D. 0.69A

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12. The term 'lost volts' refers to -----------

A. energy per coulomb wasted to heat up the connecting wires

B. energy per coulomb dissipated in the internal resistance of the source of emf

C. terminal potential difference

D. energy per coulomb dissipated in the external (load) resistance

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13. Neutral objects constitute of equal ---------------------------

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14. 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?

A. $7.2\mu$A and $100\mu$C

B. $4.6\mu$A andC 221\mu$C

C. $3.7\mu$A and $126\mu$C

D. $1.3\mu$A and $52\mu$C

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15. 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.

A. 2.67eV

B. 3.26eV

C. 7.46eV

D. 4.48eV

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16. The electric flux is a --------------------------- quantity.

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17. 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 $0.5Omega$

A. 1.27A

B. 3.45A

C. 2.44A

D. 0.13A

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18. For how long must a steady current of 2A flow through a copper voltameter to deposit $10^{-3}$kg of copper? Z for coper is 0.000329g/C

A. 42.1min

B. 22.6min

C. 30.2min

D. 25.3min

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19. A body that absorbs all radiations falling on it is known as ---------------------------.

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20. The minimum energy required to liberate an electron from a metal surface is called ---------------------------.

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21. 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?

A. 518nm

B. 507angstrome units

C. 287nm

D. 377angstrome units

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22. For capacitors connected in series each has the same ____________.

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23. The magnetic North is found by suspending a bar magnet freely on the --------------------------- axis.

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24. When beta decay occurs --------------------------- changes into a proton and electron.

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25. <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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26. The study of static charges is called ---------------------------

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27. 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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28. 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?

A. $3\times10^{3}$ m/s

B. $4\times10^{7}$ m/s

C. $2\times10^{5}$ m/s

D. $5\times10^{4}$ m/s

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29. A positively charged object repels

A. neutral objects

B. positively charged object

C. negatively charged objects

D. both positively and negatively charged objects

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30. The principle that electric forces add vectorially is known as the principle of ---------------------------

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31. A positive ion passes through an electric and magnetic fields which are mutually perpendicular. The electric field strength is 20.0kV/m while the magnetic flux density is 0.40T. At what speed will the ion pass through undeflected?

A. $6.0\times10^{4}$m/s

B. $8.0\times10^{4}$m/s

C. $5.0\times10^{4}$m/s

D. $7.0\times10^{4}$m/s

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32. 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?

A. 0.14A

B. 2.0A

C. 40.0A

D. 0.10A

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33. 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?

A. 6.0A

B. 0.11A

C. 0.06A

D. 1.1A

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34. Field lines are drawn such that the lines per unit cross-section area is proportional to ---------------------------field.

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35. Gaussian surface is an imaginary closed ---------------------------

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36. From Gauss’ law which of the following is NOT correct?

A. The total electric flux through a cylinder placed in an electric field with its axis parallel to the field is zero

B. The electric flux through a Gaussian surface is a vector product of the electric field and a unit vector perpendicular to and outward from the surface

C. The outward flux of electric field through an enclosed surface is proportional to the electric charges enclosed

D. The field at a point outside a spherically symmetric charge is the same as the electric field at the same point due to a point charge at its centre.

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37. A region where an electric charge experiences a force is ---------------------------field

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38. 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?

A. 3.6$\times10^{-2}$ J

B. 1.6$\times10^{-2}$ J

C. 2.4$\times10^{-2}$ J

D. 4.8$\times10^{-2}$ J

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39. 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.

A. 6.17V

B. 9.17V

C. 17.49V

D. 14.43V

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40. When a dielectric material is inserted between the plates of a capacitor it increases its ---------------------------

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41. 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

A. 1.24A

B. 0.64A

C. 0.32A

D. 2.13A

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42. Which of the following is a conductor

A. silk

B. copper

C. glass

D. plastic

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43. 1 volt is equal to ________

A. 1 J/C

B. 1 J/s C

C. 1 N/C

D. 1 watt/C

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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?

A. 1.51$\mu$F

B. 1.64pF

C. 2.11pF

D. 1.33mF

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45. 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?

A. 2000$\Omega$

B. 950$\Omega$

C. 200$\Omega$

D. 790$\Omega$

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46. The direction of the electric field is opposite to that of the force if the charge is ---------------------------

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47. 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}

A. $3.1\times10^{-5}$ C

B. $1.1\times10^{-3}$C

C. $2.3\times10^-{6}$C

D. $1.8\times10^-{7}C

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48. The half-life of a certain radioactive isotope is 32 hours. What fraction of the sample would remain after 16 hours?

A. 0.50

B. 0.25

C. 0.71

D. 0.62

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49. 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?

A. 60

B. 20

C. 100

D. 30

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50. The magnitude and direction of the earth's field varies with position over the --------------------------- surface.

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