1
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by (Eg)C, (Eg)si and (Eg)Ge respectively. Which one of the following relationships is true in their case?
A
(Eg)C > (Eg)Si
B
(Eg)C < (Eg)Si
C
(Eg)C = (Eg)Si
D
(Eg)C < (Eg)Ge.
2
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
In the reaction $${}_1^2$$H + $${}_1^3$$H $$ \to $$ $${}_2^4$$He + $${}_0^1$$n, if the binding
energies of $${}_1^2$$ H, $${}_1^3$$H and $${}_2^4$$He are respectively a, b and c (in MeV),
then the energy (in MeV) released in this reaction is
A
a + b + c
B
a + b $$-$$ c
C
c $$-$$ a $$-$$ b
D
c + a $$-$$ b
3
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
In any fission process the ratio
mass of fission products
mass of parent nucleus
is
A
equal to 1
B
greater than 1
C
less than 1
D
depends on the mass of the parent nucleus.
4
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
Fission of nuclei is possible because the binding energy per nucleon in them
A
increases with mass number at low mass numbers
B
decreases with mass number at low mass numbers
C
increases with mass number at high mass numbers
D
decreases with mass number at high mass numbers.