 # PHY102

## Category:PHY102

0

PHY102

1 / 50

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

2 / 50

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?

3 / 50

<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.

4 / 50

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?

5 / 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.

6 / 50

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

7 / 50

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

8 / 50

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

9 / 50

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

10 / 50

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

11 / 50

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 $0.5Omega$

12 / 50

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

13 / 50

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

14 / 50

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

15 / 50

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

16 / 50

When a charge density depends only on the perpendicular distance from a plane, the charge distribution is said to have--------------------------- symmetry.

17 / 50

According to Faraday's law, the magnitude of the induced e.m.f is proportional to the rate of change of --------------------------- linking the circuit.

18 / 50

Which of the following is a conductor

19 / 50

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

20 / 50

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

21 / 50

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?

22 / 50

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?

23 / 50

A magnetic field does not exert a force on a _________

24 / 50

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

25 / 50

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

26 / 50

An electric field of 50 kV/m is perpendicular to a magnetic field 0.25 T. What is the velocity of a charge whose initial of motion is perpendicular to both fields and which passes through the fields undeflected?

27 / 50

The work function of a metal is 3.45eV. Calculate th maximum wavelength of a photon that can eject photo-electrons from the metal

28 / 50

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 ---------------------------

29 / 50

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

30 / 50

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

31 / 50

A positively charged object repels

32 / 50

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

33 / 50

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

34 / 50

Gaussian surface is an imaginary closed ---------------------------

35 / 50

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?

36 / 50

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

37 / 50

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}

38 / 50

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?

39 / 50

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

40 / 50

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 $Q_{2}$

41 / 50

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

42 / 50

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

43 / 50

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

44 / 50

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

45 / 50

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

46 / 50

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

47 / 50

1 volt is equal to ________

48 / 50

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.

49 / 50

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.

50 / 50

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

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