1
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
We consider the radiation emitted by the human body. Which one of the following statements is true?
A
The radiation emitted is in the infra-red region
B
The radiation emitted only during the day
C
The radiation is emitted during the summers and absorbed during the winters
D
The radiation emitted lies in the ultraviolet region and hence is not visible
2
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will
A
become zero
B
become infinite
C
become small, but non-zero
D
remain unchanged
3
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
An equiconvex lens is cut into two halves along (i) XOX' and (ii) YOY' as shown in the figure. Let $$f,f',$$ $$f''$$ be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively.

Choose the correct statement from the following

AIPMT 2003 Physics - Geometrical Optics Question 35 English
A
$$f' = f,f'' = 2f$$
B
$$f' = 2f,f'' = f$$
C
$$f' = f,f'' = f$$
D
$$f' = 2f,f'' = 2f$$
4
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
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