111. Two thin convergent lenses of powers 5 dioptres and 4 dioptres are placed coaxially 10 cm
apart. The focal length of their combination would be
(A) 11·11 cm
(B) 9·09 cm
(C) 1·11 cm
(D) More than one of the above
(E) None of the above
112. An ideal transformer is used on 220 V line to deliver 2 A at 110 V. The current flowing in the primary of the transformer is
(A) 2 A
(B) 1 A
(C) 4·4 A
(D) More than one of the above
(E) None of the above
113. The radius of curvature of the path of a charged particle in a uniform magnetic field is directly proportional to
(A) intensity of the magnetic field
(B) momentum of the charged
particle
(C) charge of the particle
(D) More than one of the above
(E) None of the above
114. Imagine a light planet is revolving around a star in circular orbit of radius R with the period of revolution T . If the gravitational force of attraction between the two is proportional
to R 5 2/
, then
(A) T R 2 3 µ
(B) T R 2 3 2 µ/
(C) T R 2 7 2 µ/
(D) More than one of the above
(E) None of the above
115. When a proton injected in magnetic field moves perpendicular to the lines of force, it
follows
(A) circular path
(B) helical path
(C) parabolic path
(D) More than one of the above
(E) None of the above
116. The resistivity of a given conductor depends upon
(A) temperature
(B) length of the conductor
(C) area of cross-section
(D) More than one of the above
(E) None of the above
- The area under velocity-time
graph for a particle in a given
interval of time represents
(A) displacement
(B) acceleration
(C) work done
(D) More than one of the above
(E) None of the above
- The least resistance obtained by
using 2 W , 4 W , 1W and 100 W
is
(A) < 100 W
(B) < 2 W
(C) < 1W
(D) More than one of the above
(E) None of the above
- The nucleus of the atom is
positive
(A) due to the presence of
electrons around it
(B) due to the presence of
neutrons
(C) due to the presence of
protons
(D) More than one of the above
(E) None of the above
- Which of the following
represents voltage?
(A) Work done /
(Current × Time)
(B) Work done × Charge
(C) Work done ×
(Time / Current)
(D) More than one of the above
(E) None of the above
- As the wavelength is increased
from violet to red, the luminosity
(A) first increases then
decreases
(B) first decreases then
increases
(C) remains constant
(D) More than one of the above
(E) None of the above
- If the light moving in a straight
line bends by a small but fixed
angle, it may be a case of
(A) diffraction
(B) dispersion
(C) interference
(D) More than one of the above
(E) None of the above
- Two bullets are fired simul
taneously, horizontally and with
different speeds from the same
place. Which bullet will hit the
ground first?
(A) The faster one
(B) The slower one
(C) Both will reach simul
taneously
(D) More than one of the above
(E) None of the above
- If the speed and radius of a body
moving in a circular path are
doubled, then the magnitude of
centripetal acceleration will be
(A) half
(B) four times
(C) doubled
(D) More than one of the above
(E) None of the above
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