1
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
Two plane mirrors are inclined at 70o. A ray incident on one mirror at angle, $$\theta $$ after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of $$\theta $$ is
A
45o
B
30o
C
55o
D
50o
2
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
The reddish appearance of the sun at sunrise and sunset is due to
A
the scattering of light
B
the polarisation of light
C
the colour of the sun
D
the colour of the sky
3
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
A source of light is placed at a distance of 50 cm from a photo cell and the stopping potential is found to be V0. If the distance between the light source and photo cell is made 25 cm, the new stopping potential will be :
A
V0/2
B
V0
C
4V0
D
2V0
4
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
The de-broglie wavelength of neutrons in thermal equilibrium at temperature T is
A
$${{3.08} \over {\sqrt T }}\mathop A\limits^ \circ $$
B
$${{0.308} \over {\sqrt T }}\mathop A\limits^ \circ $$
C
$${{0.0308} \over {\sqrt T }}\mathop A\limits^ \circ $$
D
$${{30.8} \over {\sqrt T }}\mathop A\limits^ \circ $$
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