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
$$\left[ {\overrightarrow E = {E_0}\widehat j,\overrightarrow B = {B_0}\widehat k} \right]$$
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