Which one of the following is the velocity of a carrier wave?

• A) 3 × 108 ms-1
• B) 3 × 109 ms-1
• C) 3 × 1010 ms-1
• D) 3 × 106 ms-1

Which of the following statements is false about the properties of electromagnetic waves?

• A) The energy of the electromagnetic wave is divided equally between electric and magnetic fields.
• B) Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave.
• C) Both electric and magnetic field vectors attain their maximum and minimum at the same place and at the same time.
• D) These waves do not require any material medium for propagation.

An alternating current 'I0sinωt' produces heat in a given resistance at a given time, which is nearly equal to:

• A) 0.707 / I0
• B) 1/√I0
• C) 0.707 I0
• D) √I0

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

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

What does effect polarization have on the dipole moment in a dielectric material?

• A) Dipole moment decreases
• B) Dipole moment remains constant
• C) Dipole moment becomes zero
• D) Dipole moment increases

What property of ions determines the extent of deflection in a magnetic field in a mass spectrometer?

• A) Ion energy
• B) Ion-mass to charge ratio (m/q)
• C) Ion size
• D) Ion charge

The wave form of alternating voltage is a:

• A) Sine wave
• B) Contingent wave
• C) Tangent wave
• D) Cosine wave

Coulomb's law is only true for point charges whose sizes are

• A) very small
• B) very large
• C) large
• D) medium

In an electrical circuit with constant resistance, if the voltage source is doubled, what happens to the power delivered to the circuit?

• A) The power is halved.
• B) The power is doubled.
• C) The power remains the same.
• D) The power is quadrupled.

What is the expression for electric potential due to an electric dipole at a point on the axis at distance r?

• A) 𝑽 = 𝒒/(4𝝅ε₀r)
• B) 𝑽 = 𝒒d/(4𝝅ε₀r)
• C) 𝑽 = 𝒒d/(4𝝅ε₀r²)
• D) 𝑽 = 𝒒/(4𝝅ε₀r²)

It is required to suspend a proton of charge q and mass m in an electric field. The strength of field must be:

• A) m/qv
• B) qv/mg
• C) mg/q
• D) q/mg

Electric field due to oppositely charged parallel plate capacitor is

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

If the area of the plates increase by 6 times, and the distance between plates is reduced to half, the capacitance will be

• A) increased by 3 times
• B) decreased by 12 times
• C) decreased by 3 times
• D) increased by 12 times

What is the direction of the force between two charges according to Coulomb's law?

• A) Towards each other
• B) Away from each other
• C) Depends on the polarity of the charges
• D) Perpendicular to each other

In US the electricity standards are:

• A) 120 Volts and 50 Hertz
• B) 120 Volts and 60 Hertz
• C) 100 Volts and 50 Hertz
• D) 230 Volts and 50 Hertz

The electric mains supply in our homes and offices is a voltage that varies like a sine function with time. Such a voltage is called ___ and the current driven by it in a circuit is called ____.

• A) DC voltage, AC current
• B) AC voltage, DC current
• C) AC voltage, DC voltage
• D) AC voltage, AC current

Greenhouse gases absorb _____ radiation.

• A) infrared
• B) microwaves
• C) gamma
• D) ultraviolet

What is the unit of electric potential?

• A) Joule/Meter
• B) Volt/Coulomb
• C) Joule/Coulomb
• D) Newton/Meter

The relation between electric filed due to infinite sheet of charge (Es) to oppositely charged parallel plate capacitor of infinite length (Ec) is

• A) Es = 2Ep
• B) Es = Ep
• C) Ec = 2Es
• D) Es = 4Ep

Work done between two points on equipotential surface is

• A) Zero
• B) Maximum
• C) Infinite
• D) Negative