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

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

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

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2. What is the self - inductance of an air-core solenoid, 1m long and 0.05m in diameter, if it has 1400 turns?

A. 2.42mH

B. 5.23mH

C. 3.63mH

D. 4.84mH

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3. At the _______ a dipping compass needle is horizontal and at the magnetic poles it is vertical.

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

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

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

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

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5. A negative charge ---------------------------negative charge

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6. In the space surrounding a wire carrying a steady current, there exists ________

A. no magnetic field

B. an oscillating magnetic field

C. a magnetic field circling the wire

D. a magnetic field pointing radially outward

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7. 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. 790$\Omega$

C. 950$\Omega$

D. 200$\Omega$

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8. Which of the following can be used to charge a metal rod that si held in your hand? Rub it with ______

A. fur

B. It cannot be done

C. wool

D. silk

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9. 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. 1.64pF

B. 1.51$\mu$F

C. 2.11pF

D. 1.33mF

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10. Kirchhof's loop rule is statement of conservation of __________

A. energy

B. momentum

C. mass

D. charge

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11. 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. $3.7\mu$A and $126\mu$C

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

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

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

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12. The --------------------------- is the SI Unit of electric charge

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

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14. An alpha particle is a --------------------------- nucleus consisting of 2 protons and 2 neutrons.

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15. <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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16. 1 volt is equal to ________

A. 1 J/C

B. 1 watt/C

C. 1 N/C

D. 1 J/s C

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17. 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. 30.2min

B. 42.1min

C. 22.6min

D. 25.3min

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18. 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. 4.8$\times10^{-2}$ J

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

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

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

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19. 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. 377angstrome units

B. 507angstrome units

C. 287nm

D. 518nm

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20. Neutral objects constitute of equal ---------------------------

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

A. terminal potential difference

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

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

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

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22. The force that is responsible for holding electrons to nuclei to form atoms is called the --------------------------- force

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23. The variation of the compass from the north-south direction is called the ---------------------------

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24. 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?

A. connect $2000\Omega$ in parallel to it

B. connect $200.12\Omega$ in series to it

C. connect $0.012\Omega$ in parallel to it

D. connect $20.10\Omega$ in series to it

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25. Which of the following is not true of an electrostatic force?

A. it is weaker than the gravitational attraction between the charged particles.

B. it acts along the line joining the point charges

C. it is mutually attractive or repulsive

D. it obeys an inverse square law

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26. 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?

A. $8.4\times10^{-4}$ J

B. 21$\times10-4$J

C. $8.4\times10^{-3}$ J

D. $2.1\times10^{-3}$ J

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

A. point radially inward

B. circle the wire in the clockwise direction

C. point radially outward

D. circle the wire in the counterclockwise direction

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28. 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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29. Which of the following is a conductor

A. plastic

B. copper

C. glass

D. silk

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30. 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?

A. electric field is toward Q, electric potential is negative

B. electric field is toward P, electric potential zero

C. electric field is toward P, electric potential is positive

D. electric field is toward Q, electric potential is zero

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31. When an atom is in the ground state it is said to be ---------------------------

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32. According to ohm's law the potential difference is proportional to the ---------------------------

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33. A magnetic field does not exert a force on a _________

A. stationary charge

B. moving charge

C. steel pin

D. magnet

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34. 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. 4.0A and 23.1V

B. 1.6A and 24.2V

C. 0.13A and 12.1V

D. 2.17A and 32.8V

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35. Find the force on a charge 2C in a field 1Vm<sup>-1</sup>---------------------------

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

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37. 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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38. Gaussian surface is an imaginary closed ---------------------------

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

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

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41. 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.

A. $0.72\mu$V

B. $0.65\mu$V

C. $0.47\mu$V

D. $0.52\mu$V

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42. The surface integral of the electric field E over a surface is defined to be electric ---------------------------

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43. Calculate the electric field at distance of 320 cm from an infinitely long wire carrying a charge per unit length 8.3 C/m.

A. $3.26\times10^{10}$ N/C

B. $8.85\times10^{10}$ N/C

C. $6.22\times10^{10}$ N/C

D. $4.66\times10^{10}$ N/C

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44. 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. ${-}3.1\times10^{-6}C

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

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

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

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

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47. The resistivity of a semiconductor decreases rapidly with increasing ---------------------------.

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

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49. What are the dimensions of the constant k in Coulomb’s law of electrostatics?

A. $ ML^{3}T^{-4}A^{-2}$

B. $ML^{2}T{-4} T{-2}A{-1}$

C. $M^{-2}L^{3}T^{2}A^{-1}$

D. $ML^{2}T^{3}A^{-2}$

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50. The force between electric charges is known as ---------------------------

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