Electricity
Current Electricity
MCQ (Single Correct Answer)
Moving Charges and Magnetism
MCQ (Single Correct Answer)
Magnetism and Matter
MCQ (Single Correct Answer)
Electromagnetic Induction
MCQ (Single Correct Answer)
Electromagnetic Waves
MCQ (Single Correct Answer)
Modern Physics
Semiconductor Electronics
MCQ (Single Correct Answer)
1
NEET 2013
MCQ (Single Correct Answer)
+4
-1
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is
A
Microwaves are heat waves, so always produce heating.
B
Infra-red waves produce heating in a microwave oven.
C
The frequency of the microwaves must match the resonant frequency of the water molecules.
D
The frequency of the microwaves has no relation with natural frequency of water molecules.
2
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagatting in vacuum is equal to
A
the speed of light in vacuum
B
reciprocal of speed of light in vacuum
C
the ratio of magnetic permeability to the electric susceptibility of vacuum
D
unity
3
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
The electric field associated with an em wave in vacuum is given by
E = $$\widehat i$$ 40 cos (kz $$-$$ 6 $$ \times $$ 108 t) where E, z and t are in volt/m, meter and seconds respectively. The value of wave vector k is
A
2 m$$-$$1
B
0.5 m$$-$$1
C
6 m$$-$$1
D
3 m$$-$$1
4
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
The electric and the magnetic field, associated with an e.m. wave, propagating along the +z-axis, can be represented by
A
$$\left[ {\overrightarrow E = {E_0}\widehat i,\overrightarrow B = {B_0}\widehat j} \right]$$
B
$$\left[ {\overrightarrow E = {E_0}\widehat k,\overrightarrow B = {B_0}\widehat i} \right]$$
C
$$\left[ {\overrightarrow E = {E_0}\widehat j,\overrightarrow B = {B_0}\widehat i} \right]$$
D
$$\left[ {\overrightarrow E = {E_0}\widehat j,\overrightarrow B = {B_0}\widehat k} \right]$$
NEET Subjects