1
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
An object $$2.4$$ $$m$$ in front of a lens forms a sharp image on a film $$12$$ $$cm$$ behind the lens. A glass plate $$1$$ $$cm$$ thick, of refractive index $$1.50$$ is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus of film?
A
$$7.2$$ $$m$$
B
$$24$$ $$m$$
C
$$3.2$$ $$m$$
D
$$5.6$$ $$m$$
2
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
Hydrogen atom is excited from ground state to another state with principal quantum number equal to $$4.$$ Then the number of spectral lines in the emission spectra will be :
A
$$2$$
B
$$3$$
C
$$5$$
D
$$6$$
3
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
A radar has a power of $$1kW$$ and is operating at a frequency of $$10$$ $$GHz.$$ It is located on a mountain top of height $$500$$ $$m.$$ The maximum distance upto which it can detect object located on the surface of the earth (Radius of earth $$ = 6.4 \times {10^6}m$$) is :
A
$$80$$ $$km$$
B
$$16$$ $$km$$
C
$$40$$ $$km$$
D
$$64$$ $$km$$
4
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
Assume that a neutron breaks into a proton and an electron. The energy released during this process is : (mass of neutron $$ = 1.6725 \times {10^{ - 27}}kg,$$ mass of proton $$ = 1.6725 \times {10^{ - 27}}\,kg,$$ mass of electron $$ = 9 \times {10^{ - 31}}\,kg$$ ).
A
$$0.51$$ $$MeV$$
B
$$7.10\,MeV$$
C
$$6.30\,MeV$$
D
$$5.4\,MeV$$
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