1
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
Two thin lenses of focal lengths f1 and f2 are in contact and coaxial. The power of the combination is
A
$${{{f_1} + {f_2}} \over 2}$$
B
$${{{f_1} + {f_2}} \over {{f_1}{f_2}}}$$
C
$$\sqrt {{{{f_1}} \over {{f_2}}}} $$
D
$$\sqrt {{{{f_2}} \over {{f_1}}}} $$
2
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the sun is 1.39 $$ \times $$ 109 m and its mean distance from the earth is 1.5 $$ \times $$ 1011 m. What is the diameter of the sun's image on the paper ?
A
6.5 $$ \times $$10$$-$$5 m
B
12.4 $$ \times $$10$$-$$4 m
C
9.2 $$ \times $$10$$-$$4 m
D
6.5 $$ \times $$10$$-$$4 m
3
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 $$ \times $$ 106 m s$$-$$1. The velocity of the particle is
A
3 $$ \times $$ 10$$-$$31 ms$$-$$1
B
$$2.7 \times {10^{ - 21}}\,m{s^{ - 1}}$$
C
2.7 $$ \times $$ 10$$-$$18 ms$$-$$1
D
9 $$ \times $$ 10$$-$$2 ms$$-$$1
4
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the
A
infrared region
B
X-ray region
C
Ultraviolet region
D
Visible region
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