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. <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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2. At the _______ a dipping compass needle is horizontal and at the magnetic poles it is vertical.

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

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4. 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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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. 4.0A and 23.1V

B. 2.17A and 32.8V

C. 1.6A and 24.2V

D. 0.13A and 12.1V

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

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

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8. 1 volt is equal to ________

A. 1 watt/C

B. 1 J/C

C. 1 N/C

D. 1 J/s C

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9. A negative charge ---------------------------negative charge

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10. 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. $7.0\times10^{4}$m/s

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

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

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

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11. 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 P, electric potential is positive

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

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

D. electric field is toward P, electric potential zero

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

A. shock waves

B. Rapid expansion of surrounding air

C. gamma radiation.

D. Lightning

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

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14. Potential difference is the work done in moving a unit charge ____ from one point to another in an electric field.

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15. 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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16. 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. 0.71

C. 0.25

D. 0.62

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

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

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19. 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. 790$\Omega$

B. 2000$\Omega$

C. 200$\Omega$

D. 950$\Omega$

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20. 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 $20.10\Omega$ in series to it

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

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

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21. 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. 3.26eV

B. 4.48eV

C. 7.46eV

D. 2.67eV

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22. 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. 1.27A

C. 2.44A

D. 0.13A

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

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24. A positively charged object repels

A. negatively charged objects

B. both positively and negatively charged objects

C. positively charged object

D. neutral objects

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

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

A. an oscillating magnetic field

B. a magnetic field circling the wire

C. no magnetic field

D. a magnetic field pointing radially outward

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

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29. When amber is rubbed with fur

A. amber is negatively charged while fur is neutral

B. amber is negatively charged while fur is positively charged

C. amber is positively charged while fur is negatively charged

D. amber is positively charged while fur is neutral

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

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

A. 1.33A

B. 0.69A

C. 3.27A

D. 2.15A

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32. 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. 0.11A

B. 0.06A

C. 6.0A

D. 1.1A

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33. 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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34. 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. 22.6min

D. 30.2min

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35. 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. 377angstrome units

D. 518nm

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36. 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. wool

C. silk

D. fur

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37. 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. 30

B. 20

C. 100

D. 60

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

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39. 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 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.

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

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

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40. 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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41. 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. $3.6\times10^{-7}$m

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

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

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

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42. 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 obeys an inverse square law

C. it is mutually attractive or repulsive

D. it acts along the line joining the point charges

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43. 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 dissipated in the external (load) resistance

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

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44. 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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45. 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. 2.13A

D. 0.32A

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

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

A. 240cos339.4t

B. 240sin339.4t

C. 377cos339.4t

D. 339.4sin377t

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

A. $ $\vec{E}$ is directly proportional to the distance from the centre 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 maximum at the surface of the sphere

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49. The study of static charges is called ---------------------------

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50. 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. 9.17V

B. 14.43V

C. 17.49V

D. 6.17V

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