1
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
This question has Statement - $$1$$ and Statement - $$2$$. Of the four choices given after the statements, choose the one that best describes the two statements.
Statement -$$1$$ : Sky wave signals are used for long distance radio communication. These signals are in general, less stable then ground wave signals.
Statement -$$2$$ : The state of ionosphere varies from hour to hour, day to day and season to season.
A
Statement - $$1$$ is true, Statement - $$2$$ is true, Statement - $$2$$ is the correct explanation of Statement - $$1$$.
B
Statement - $$1$$ is true, Statement - $$2$$ is true, Statement - $$2$$ is not the correct explanation of Statement - $$1$$.
C
Statement - $$1$$ is false, Statement - $$2$$ is true
D
Statement - $$1$$ is true, Statement - $$2$$ is false.
2
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
Energy required for the electron excitation in $$L{i^{ + + }}$$ from the first to the third Bohr orbit is :
A
$$36.3$$ $$eV$$
B
$$108.8$$ $$eV$$
C
$$122.4$$ $$eV$$
D
$$12.1$$ $$eV$$
3
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
This question has Statement - $$1$$ and Statement - $$2$$. Of the four choices given after the statements, choose the one that best describes the two statements.

Statement - $$1$$ : A metallic surface is irradiated by a monochromatic light of frequency $$v > {v_0}$$ (the threshold frequency). The maximum kinetic energy and the stopping potential are $${K_{\max }}$$ and $${V_0}$$ respectively. If the frequency incident on the surface is doubled, both the $${K_{\max }}$$ anmd $${V_0}$$ are also doubled.
Statement - $$2$$ : The maximum kinetic energy and the stopping potential of photoelectrons emitted from a surface are linearly dependent on the frequency of incident light.

A
Statement - $$1$$ is true, Statement - $$2$$ is true, Statement - $$2$$ is the correct explanation of Statement - $$1$$.
B
Statement - $$1$$ is true, Statement - $$2$$ is true, Statement - $$2$$ is not the correct explanation of Statement - $$1$$.
C
Statement - $$1$$ is false, Statement - $$2$$ is true.
D
Statement - $$1$$ is true, Statement - $$2$$ is false.
4
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The half life of a radioactive substance is $$20$$ minutes. The approximate time interval $$\left( {{t_2} - {t_1}} \right)$$ between the time $${{t_2}}$$ when $${2 \over 3}$$ of it had decayed and time $${{t_1}}$$ when $${1 \over 3}$$ of it had decayed is :
A
$$14$$ min
B
$$20$$ min
C
$$28$$ min
D
$$7$$ min
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