1
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
The diagram shows the energy levels for an electron in a certain atom. Which transition shown represents the emission of a photon with the most energy? AIEEE 2005 Physics - Atoms and Nuclei Question 231 English
A
$$iv$$
B
$$iii$$
C
$$ii$$
D
$$i$$
2
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
A photocell is illuminated by a small bright source placed $$1$$ $$m$$ away. When the same source of light is placed $${1 \over 2}$$ $$m$$ away, the number of electrons emitted by photo-cathode would
A
increases by a factor of $$4$$
B
decreases by a factor of $$4$$
C
increases by a factor of $$2$$
D
decreases by a factor of $$2$$
3
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is $${4 \over 3}$$ and the fish is $$12$$ $$cm$$ below the surface, the radius of this circle in $$cm$$ is
A
$${{36} \over {\sqrt 7 }}$$
B
$${36\sqrt 7 }$$
C
$${4\sqrt 5 }$$
D
$${36\sqrt 5 }$$
4
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Two sources of equal $$emf$$ are connected to an external resistance $$R.$$ The internal resistance of the two sources are $${R_1}$$ and $${R_2}\left( {{R_1} > {R_1}} \right).$$ If the potential difference across the source having internal resistance $${R_2}$$ is zero, then
A
$$R = {R_2} - {R_1}$$
B
$$R = {R_2} \times \left( {{R_1} + {R_2}} \right)/\left( {{R_2} - {R_1}} \right)$$
C
$$R = {R_1}{R_2}/\left( {{R_2} - {R_1}} \right)$$
D
$$R = {R_1}{R_2}/\left( {{R_1} - {R_2}} \right)$$
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