1
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
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
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices $$\mu $$1 and $$\mu $$2 and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is
A
$${R \over {\left( {{\mu _1} - {\mu _2}} \right)}}$$
B
$${{2R} \over {\left( {{\mu _2} - {\mu _1}} \right)}}$$
C
$${R \over {2\left( {{\mu _1} + {\mu _2}} \right)}}$$
D
$${R \over {2\left( {{\mu _1} - {\mu _2}} \right)}}$$
3
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
A, B and C are three points in a uniform electric field. The electric potential is

NEET 2013 Physics - Electrostatics Question 61 English
A
maximum at C
B
same at all the three points A, B and C
C
maximum at A
D
maximum at B
4
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths $${\lambda _1}$$ = 12000 $$\mathop A\limits^ \circ $$ and $${\lambda _2}$$ = 10000 $$\mathop A\limits^ \circ $$. At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other ?
A
4 mm
B
3 m
C
8 mm
D
6 mm
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