1
AIPMT 2001
MCQ (Single Correct Answer)
+4
-1
A ray of light travelling in air have wavelength $$\lambda $$, frequency n, velocity v and intensity $$I$$. If this ray enters into water then these parameters are $$\lambda $$', n', v' and $$I$$' respectively. Which relation is correct from following ?
A
$$\lambda $$ = $$\lambda $$'
B
n = n'
C
v = v'
D
$$I$$ = $$I$$'.
2
AIPMT 2001
MCQ (Single Correct Answer)
+4
-1
Optical fibre are based on
A
total internal reflection
B
less scattering
C
refraction
D
less absorption coefficient.
3
AIPMT 2001
MCQ (Single Correct Answer)
+4
-1
A disc is placed on a surface of pond which has refractive index 5/3. A source of light is placed 4 m below the surface of liquid. The minimum radius of disc needed so that light is not coming out is,
A
$$\infty $$
B
3 m
C
6 m
D
4 m
4
AIPMT 2001
MCQ (Single Correct Answer)
+4
-1
If specific resistance of a potentiometer wire is 10-7$$\Omega $$ m and current flow through it is 0.1 amp., cross-sectional area of wire is 10$$-$$6 m2 then potential gradient will be
A
10$$-$$2 volt/m
B
10$$-$$4 volt/m
C
10$$-$$6 volt/m
D
10$$-$$8 volt/m.
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