NEET Physics Electromagnetic Waves Conduction and Displacement Current MCQs

Question: The electromagnetic waves do not transport

a) charge

b) information

c) energy

d) momentum

Answer: charge

Question: The polarisation of electromagnetic wave is in

a) the directions of electric field

b) the direction of magnetic field

c) the directions of electric and magnetic field

d) can not be polarized

Answer: the directions of electric field

Question: The current in the electric circuit which arises due to flow of electrons in the connecting wires of the circuit in a defined closed path is called

a) conduction current

b) alternating current

c) direct current

d) displacement current

Answer: conduction current

Question: If a variable frequency ac source connected to a capacitor then with decrease in frequency, the displacement current will

a) decrease

b) remain constant

c) first decrease then increase

d) increase

Answer: decrease

Question: Displacement current goes through the gap between the plates of a capacitor when the charge on the capacitor

a) is changing with time

b) does not change

c) decreases

d) decreases to zero

Answer: is changing with time

Question: An electron oscillating with a frequency of 3 × 10⁶ Hz, would generate

a) radio waves

b) X-rays

c) ultraviolet rays

d) microwaves

Answer: radio waves

Question: In an electromagnetic wave

a) power is transmitted in a direction perpendicular to both the fields

b) power is equally transferred along the electric and magnetic fields

c) power is transmitted along the electric field

d) power is transmitted along the magnetic field

Answer: power is transmitted in a direction perpendicular to both the fields

Question: If the frequency of EM radiations is halved then the energy of EM radiation will become

a) becomes half

b) double

c) remains unchanged

d) becomes one fourth

Answer: becomes half