1
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
J.J. Thomson's cathode-ray tube experiment demonstrated that
A
cathode rays are streams of negatively charged ions
B
all the maas of an atom is essentially in the nucleus
C
the e/m of electrons is much greater than the e/m of protons
D
the e/m ratio of the cathode-ray particles changes when a different gas is placed in the discharge tube
2
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force $$\overrightarrow F $$ between the two is
A
$$K{{{e^2}} \over {{r^2}}}\widehat r$$
B
$$ - K{{{e^2}} \over {{r^3}}}\widehat r$$
C
$$K{{{e^2}} \over {{r^3}}}\widehat r$$
D
$$ - K{{{e^2}} \over {{r^2}}}\widehat r$$
3
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Solar energy is mainly caused due to
A
burning of hydrogen in the oxygen
B
fission of uranium present in the Sun
C
fusion of protons during synthesis of heavier elements
D
gravitational contraction
4
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
The volume occupied by an atom is greater than the volume of the nucleus by a factor of about
A
101
B
105
C
1010
D
1015
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