The S.I unit of electric flux is:

• A) Nm-1C-1
• B) Nm-1C-2
• C) N-1m2C
• D) Nm2C-1

What principle governs the conversion of magnetic variations into an electric current in magnetic recording tapes?

• A) Coulomb's Law
• B) Ampere's Law
• C) Faraday's Law
• D) Ohm's Law

What happens to the electric field at the surface of a perfect electric conductor

• A) Electric field is infinite
• B) Electric field is zero
• C) Electric field is discontinuous and proportional to sigma
• D) Electric field is continuous and proportional to sigma

When a charge is projected perpendicular to a uniform magnetic field, its path is:

• A) Ellipse
• B) Circular
• C) Spiral
• D) Helix

In the equation J = n⋅e⋅vd​, what does n represent?

• A) Negative charge
• B) Total number of charge carriers
• C) Drift velocity
• D) Number density of charge carriers

Electric energy is measured:

• A) Horsepower
• B) Watt
• C) Kilowatt
• D) Kilowatt hour

Which electromagnetic radiation transmits the highest photon energy?

• A) Ultraviolet radiations
• B) Infrared rays
• C) Gamma rays
• D) Microwaves

Magnetic flux (ΦB​) is defined as:

• A) The ability of a material to conduct magnetic lines
• B) The measure of magnetic pole strength
• C) The quantity of magnetic field passing through a surface
• D) The strength of a magnet

Electric field due to infinite sheet of charge is

• A) ϕ/εo
• B) ϕ/2εo
• C) σ/2εo
• D) σ/εo

In Pakistan the electricity standards are:

• A) 20 Volts and 50 Hertz
• B) 30 Volts and 50 Hertz
• C) 230 Volts and 50 Hertz
• D) 10 Volts and 50 Hertz

A particular device transmitted a signal in the form of electromagnetic waves of frequency 7.5 * 108 Hz. What is the wavelength of the signal?

• A) 40 m
• B) 0.4 m
• C) 4.04 m
• D) 4.0 m

How is the capacitance of a capacitor defined as?

• A) Electric field strength
• B) Voltage per unit charge
• C) Amount of charge stored per unit potential difference
• D) Electric force per unit charge

Force on a charged particle is zero when projected at angle with the magnetic field:

• A) 0 degree
• B) 180 degree
• C) 270 degree
• D) 90 degree

A capacitor in an LC oscillator has a maximum potential difference of 15V and a maximum energy of 360 μJ. At a certain instant the energy in the capacitor is 40 μJ. At that instant what is the emf induced in the inductor?

• A) 15V
• B) zero
• C) 10V
• D) 5V

The total energy in an LC circuit is 5.0 × 10−6 J. If L = 25mH the maximum current is:

• A) 14mA
• B) 10mA
• C) 28mA
• D) 20mA

The product of resistance and capacitance is called

• A) Velocity
• B) force
• C) Current
• D) Time

What is the direction of the area vector for a flat surface in the context of magnetic flux?

• A) Perpendicular to the surface
• B) Tangential to the surface
• C) Directed randomly
• D) Parallel to the surface

An inductor may store energy in its:

• A) Magnetic field
• B) Electric field
• C) Potential field
• D) Gravitational field

If the current in a circuit is 2 A and the resistance is 3 Ω, what is the power consumed?

• A) 5 watts
• B) 12 watts
• C) 6 watts
• D) 18 watts

Total flux through a closed surface depends on:

• A) Medium only
• B) Charge and – N
• C) Charge enclosed
• D) Shape of surface