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

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

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

A. charge

B. momentum

C. energy

D. mass

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4. 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. 1.1A

D. 0.06A

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5. 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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6. Which of the following is a conductor

A. glass

B. copper

C. plastic

D. silk

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

A. circle the wire in the counterclockwise direction

B. circle the wire in the clockwise direction

C. point radially outward

D. point radially inward

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

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

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10. 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. 100

C. 60

D. 20

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

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12. 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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13. 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. 40.0A

B. 2.0A

C. 0.14A

D. 0.10A

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

A. a magnetic field circling the wire

B. a magnetic field pointing radially outward

C. an oscillating magnetic field

D. no magnetic field

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

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17. <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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18. For capacitors in parallel, the potential difference across each capacitor is ---------------------------

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19. 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 is weaker than the gravitational attraction between the charged particles.

D. it obeys an inverse square law

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20. 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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21. 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. $2.3\times10^-{6}$C

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

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

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

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

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

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

A. shock waves

B. Lightning

C. Rapid expansion of surrounding air

D. gamma radiation.

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

A. 3.27A

B. 1.33A

C. 0.69A

D. 2.15A

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

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

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

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

D. 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

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30. 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. $3.4\times10^{-7}$m

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

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

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

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

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32. 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. 14.43V

B. 6.17V

C. 17.49V

D. 9.17V

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

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

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35. 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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36. 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. 0.62

C. 0.25

D. 0.71

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

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

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

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38. As charge increases, electric flux density ---------------------------

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

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

B. terminal potential difference

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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40. 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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41. A magnetic field does not exert a force on a _________

A. stationary charge

B. magnet

C. moving charge

D. steel pin

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42. 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. 2.11pF

C. 1.51$\mu$F

D. 1.33mF

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

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

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45. 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. 0.16N

B. 0.25N

C. 0.45N

D. 0.20N

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

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47. 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. $4.6\mu$A andC 221\mu$C

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

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

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48. 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. 0.7 km

B. 0.3 km

C. 0.9 km

D. 0.5 km

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49. 1eV is the energy acquired by an electron in falling freely through --------------------------- 1volt.

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

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