1
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
An inductor of inductance $$L=400$$ $$mH$$ and resistors of resistance $${R_1} = 2\Omega $$ and $${R_2} = 2\Omega $$ are connected to a battery of $$emf$$ $$12$$ $$V$$ as shown in the figure. The internal resistance of the battery is negligible. The switch $$S$$ is closed at $$t=0.$$ The potential drop across $$L$$ as a function of time is : AIEEE 2009 Physics - Alternating Current Question 139 English
A
$${{12} \over t}{e^{ - 3t}}V$$
B
$$6\left( {1 - {e^{ - t/0.2}}} \right)V$$
C
$$12{e^{ - 5t}}V$$
D
$$6{e^{ - 5t}}V$$
2
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
A transparent solid cylindrical rod has a refractive index of $${2 \over {\sqrt 3 }}.$$ It is surrounded by air. A light ray is incident at the mid-point of one end of the rod as shown in the figure. AIEEE 2009 Physics - Geometrical Optics Question 163 English

The incident angle $$\theta $$ for which the light ray grazes along the wall of the rod is :

A
$${\sin ^{ - 1}}\left( {{\raise0.5ex\hbox{$\scriptstyle {\sqrt 3 }$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 2$}}} \right)$$
B
$${\sin ^{ - 1}}\left( {{\raise0.5ex\hbox{$\scriptstyle 2$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle {\sqrt 3 }$}}} \right)$$
C
$${\sin ^{ - 1}}\left( {{1 \over {\sqrt 3 }}} \right)$$
D
$${\sin ^{ - 1}}\left( {{\raise0.5ex\hbox{$\scriptstyle 1$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 2$}}} \right)$$
3
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
The transition from the state $$n=4$$ to $$n=3$$ in a hydrogen like atom result in ultra violet radiation. Infrared radiation will be obtained in the transition from :
A
$$3 \to 2$$
B
$$4 \to 2$$
C
$$5 \to 4$$
D
$$2 \to 1$$
4
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
The surface of a metal is illuminated with the light of $$400$$ $$nm.$$ The kinetic energy of the ejected photoelectrons was found to be $$1.68$$ $$eV.$$ The work function of the metal is : $$\left( {hc = 1240eV.nm} \right)$$
A
$$1.41$$ $$eV$$
B
$$1.51$$ $$eV$$
C
$$1.68$$ $$eV$$
D
$$3.09$$ $$eV$$
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