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

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2. 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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3. For capacitors connected in series each has the same ____________.

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

A. terminal potential difference

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

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

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

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

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

A. Lightning

B. shock waves

C. Rapid expansion of surrounding air

D. gamma radiation.

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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. 200$\Omega$

B. 2000$\Omega$

C. 950$\Omega$

D. 790$\Omega$

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8. Whose law is employed in electrostatics ?

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9. 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. $4.66\times10^{10}$ N/C

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

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

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

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

A. it is mutually attractive or repulsive

B. it acts along the line joining the point charges

C. it obeys an inverse square law

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

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

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

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13. The --------------------------- number is the total number of neutrons and protons.

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14. 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

A. 46.5 m

B. 90.6 m

C. 37.8 m

D. 56.1 m

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

A. 1.33A

B. 0.69A

C. 2.15A

D. 3.27A

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16. Gauss's law applies to any hypothetical closed surface called --------------------------- surface.

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17. 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. 2.13A

B. 1.24A

C. 0.32A

D. 0.64A

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

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

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

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

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19. 1 volt is equal to ________

A. 1 watt/C

B. 1 N/C

C. 1 J/s C

D. 1 J/C

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20. Which of the following is a conductor

A. glass

B. copper

C. silk

D. plastic

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21. For capacitors in parallel, the potential difference across each capacitor is ---------------------------

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22. 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. 0.06A

B. 6.0A

C. 0.11A

D. 1.1A

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23. 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

A. 0.20N

B. 0.45N

C. 0.16N

D. 0.25N

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24. 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. $0.65\mu$V

B. $0.52\mu$V

C. $0.72\mu$V

D. $0.47\mu$V

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

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26. 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. ${-}80\vec{i}+69.3\vec{j}$

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

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

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

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27. 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. $8.4\times10^{-3}$ J

B. 21$\times10-4$J

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

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

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28. Kirchhof's junction rule is statement of conservation of -----------

A. energy

B. mass

C. momentum

D. charge

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

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

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

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

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33. 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. 287nm

B. 518nm

C. 507angstrome units

D. 377angstrome units

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34. A negative charge ---------------------------negative charge

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35. A voltmeter connected across a 60Hz ac source reads 240V. Write down the expression of the instanteneous voltage as a function of time.

A. 377cos339.4t

B. 240sin339.4t

C. 339.4sin377t

D. 240cos339.4t

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36. 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 $200.12\Omega$ in series to it

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

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

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

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37. 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.

A. 0.3 km

B. 0.5 km

C. 0.9 km

D. 0.7 km

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

A. do not intersect one another

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

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. are discontinuous and may terminate in a vacuum

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

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40. For capacitors in parallel, the potential difference across each capacitor is ---------------------------

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

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

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

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 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.

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

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44. Which of the following is not true about the electric field intensity $vec{E}$ of a uniformly charged solid sphere?

A. $$\vec {E}$$ decreases as a square of the distance from the centre of the sphere.

B. $$\vec{E}$$ is maximum at the surface of the sphere

C. $\vec{E}$$decreases as a square of the distance from the surface of the sphere

D. $ $\vec{E}$ is directly proportional to the distance from the centre of the sphere

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45. The energy stored in a system of charges is known as electrostatic potential ---------------------------

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

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47. 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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48. When amber is rubbed with fur

A. amber is positively charged while fur is negatively charged

B. amber is negatively charged while fur is positively charged

C. amber is positively charged while fur is neutral

D. amber is negatively charged while fur is neutral

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49. 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. 1.6A and 24.2V

B. 2.17A and 32.8V

C. 4.0A and 23.1V

D. 0.13A and 12.1V

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50. 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. 7.46eV

B. 3.26eV

C. 2.67eV

D. 4.48eV

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