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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
A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then
A
each emitted electron carries one quarter of the initial energy
B
number of electrons emitted is half the initial number
C
each emitted electron carries half the initial energy
D
number of electrons emitted is a quarter of the initial number
3
AIPMT 2002
MCQ (Single Correct Answer)
+4
-1
The value of Planck's constant is
A
6.63 $$ \times $$ 10$$-$$34 J/sec.
B
6.63 $$ \times $$ 10$$-$$34 kg-m2/sec
C
6.63 $$ \times $$ 10$$-$$34 kg-m2
D
6.63 $$ \times $$ 10$$-$$34 J-sec.
4
AIPMT 2002
MCQ (Single Correct Answer)
+4
-1
Which of the following is not the property of cathode rays ?
A
In produces heating effect
B
It does not deflect in electric field
C
It casts shadow
D
It produces fluorscence.
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