1
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
A photocell employs photoelectric effect to convert
A
change in the frequency of light into a change in the electric current
B
change in the frequency of light into a change in electric voltage
C
change in the intensity of illumination into a change in photoelectric current
D
change in the intensity of illumination into a change in the work function of the photocathode.
2
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
When photons of energy h$$\upsilon $$ fall on an aluminimum plate (of work function E0), photoelectrons of maximum kinetic energy K are ejected. If the frequency of radiation is doubled, the maximum kinetic energy of the ejected photoelectrons will be
A
K + h$$\upsilon $$
B
K + E0
C
2K
D
K.
3
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
In a discharge tube ionization of enclosed gas is produced due to collisions between
A
neutral gas atoms/molecules
B
positive ions and neutral atoms/molecules
C
negative electrons and neutral atoms/molecules
D
photons and neutral atoms/molecules.
4
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again ?
A
2 cm upward
B
1 cm upward
C
4.5 cm downward
D
1 cm downward