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

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

B. $$\vec {E}$$ decreases as a square of the distance from the centre 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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2. 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. 0.06A

C. 1.1A

D. 0.11A

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3. When amber is rubbed with fur

A. amber is positively charged while fur is neutral

B. amber is negatively charged while fur is positively charged

C. amber is negatively charged while fur is neutral

D. amber is positively charged while fur is negatively charged

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

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5. A charge distribution in which the charge density at any point depends only on the distance of the point from a central point and not on the direction is said to be spherically ---------------------------

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6. 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. 0.32A

C. 2.13A

D. 0.64A

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7. Electric charge between two bodies can be produced by ---------------------------

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

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

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10. In the cathode ray oscilloscope, when fast moving electrons strike the glass screen coated with zinc and sulphide they cause ---------------------------.

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

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

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

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

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

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

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

A. 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

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

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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14. 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. 4.8$\times10^{-2}$ J

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

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15. In the method of charging by friction, The algebraic sum of the individual charges that is the net charge is ---------------------------.

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

A. momentum

B. energy

C. charge

D. mass

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17. 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. 790$\Omega$

D. 950$\Omega$

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18. 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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19. 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. 0.10A

C. 2.0A

D. 40.0A

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20. A positively charged object repels

A. negatively charged objects

B. both positively and negatively charged objects

C. neutral objects

D. positively charged object

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21. Two charges $Q_{1} = 500mu{C}$ and $Q_{2} = 100mu{C}$ are located on the XY plane at the positions $r_{1} = 3vec{j} m and r_{2} = 4vec{i}$ m. Find the force exerted on the $Q_{2}$

A. $10.8\vec{i} – 14.4\vec{j}$ N

B. $14.4\vec{i} – 10.8\vec{j}$ N

C. $14.4\vec{i} + 10.8\vec{j}$ N

D. $10.8\vec{i} + 14.4\vec{j}$ N

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

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

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24. 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. $8.4\times10^{-3}$ J

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

D. 21$\times10-4$J

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

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

A. 2.15A

B. 1.33A

C. 3.27A

D. 0.69A

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27. 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. $0.52\mu$V

B. $0.65\mu$V

C. $0.72\mu$V

D. $0.47\mu$V

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

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29. 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. 507angstrome units

C. 518nm

D. 377angstrome units

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

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31. 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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32. 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. 3.45A

B. 2.44A

C. 0.13A

D. 1.27A

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

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34. 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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35. As charge increases, electric flux density ---------------------------

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

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

A. It cannot be done

B. fur

C. silk

D. wool

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

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39. 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. 25.3min

B. 42.1min

C. 30.2min

D. 22.6min

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40. Electric flux density is a function of ---------------------------

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41. 1 volt is equal to ________

A. 1 J/s C

B. 1 watt/C

C. 1 N/C

D. 1 J/C

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42. Property of magnetic material in which --------------------------- attracts or repels.

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

A. a magnetic field circling the wire

B. an oscillating magnetic field

C. a magnetic field pointing radially outward

D. no magnetic field

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44. 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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45. Which of the following is a conductor

A. silk

B. plastic

C. glass

D. copper

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

A. energy

B. charge

C. mass

D. momentum

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

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

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

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50. 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. 0.25N

B. 0.16N

C. 0.20N

D. 0.45N

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