A student rubs a rod held in his hand.
Which action causes the rod to gain a large electrostatic charge?

• A) Rubbing a polythene rod with a steel magnet
• B) Rubbing an iron rod with a steel magnet
• C) Rubbing an iron rod with a woolen duster
• D) Rubbing a polythene rod with a woolen duster

The wavelength of red light is 700 nm. Its frequency is ______.

• A) 4.29 * 10^15 Hertz
• B) 4.29 * 10^12 Hertz
• C) 4.29 * 10^13 Hertz
• D) 4.29 * 10^14 Hertz

What is the relationship between the electric field (E) and the dipole moment (p) at a point (r) on the axial line of the dipole?

• A) E = p/r
• B) E ∝ p/r²
• C) E = p
• D) E ∝ p/r³

What is the unit of charge distribution for linear density?

• A) Coulomb / length2
• B) length / Coulomb
• C) Length/ Farad
• D) Coulomb / length

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) mg/q
• C) qv/mg
• D) q/mg

If magnetic field is doubled then magnetic energy density becomes:

• A) Six times
• B) Three times
• C) Two times
• D) Four times

Under what condition is induced electromotive force (EMF) produced in a conductor?

• A) When there is a strong magnetic field
• B) When there is a strong electric field
• C) When there is a constant magnetic field
• D) When there is a time-varying magnetic field

What does effect the introduction of dielectric material have on the relative permittivity (ϵr​) in a capacitor?

• A) Remains constant
• B) Becomes zero
• C) Decreases
• D) Increases

If F is the force acting on the test charge qo, the electric field intensity E would be given by

• A) E = F + qo
• B) E = F - qo
• C) E = F/qo
• D) E = qo/F

If the drift velocity vd of charge carriers in a conductor increases, what happens to the current density J?

• A) J becomes negative.
• B) J decreases.
• C) J increases.
• D) J remains unchanged.

Greenhouse gases absorb _____ radiation.

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

A particle having 2e charge falls through a potential difference of 5 V. energy acquired by it is

• A) 0.4 eV
• B) 10 eV
• C) 20 eV
• D) 2.5 eV

The known laws of electromagnetism before James Clerk Maxwell were following, EXCEPT:

• A) Gauss's Laws
• B) De Broglie Law
• C) Faraday's Law
• D) Ampere's Law

Which of the following is NOT the characteristic of electromagnetic waves?

• A) They have both fields, electric field and magnetic fields
• B) They can travel with different speeds in vacuum depending on frequency
• C) There is no limit to the amplitude or frequency
• D) They can travel through vacuum

Electric flux is maximum when surface is held __________ to field lines.

• A) 45o
• B) Perpendicular
• C) 0o
• D) Parallel

Electromagnetic waves are transverse in nature, as evident by the phenomenon of ______.

• A) Interference
• B) Polarization
• C) Reflection
• D) Diffraction

In an electric field E, if a charge Q is present, the force F acting on it is given by:

• A) F = Q + E
• B) F = QE
• C) F = Q - E
• D) F = Q / E

How is the potential difference related to the electric field in a capacitor?

• A) Inversely proportional
• B) Unrelated
• C) Directly proportional
• D) Exponential relationship

Maximum power delivered by a battery is:

• A) E2/4r
• B) VIT
• C) Unlimited
• D) 4rE2

When we accelerate the charge, which types of waves are produced?

• A) Electromagnetic waves
• B) Stationary waves
• C) Travelling waves
• D) Mechanical waves