1
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Which of the following rays are not electromagnetic waves ?
A
X-rays
B
$$\gamma $$-rays
C
$$\beta $$-rays
D
heat rays
2
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
$$f' = 2f,f'' = 2f$$
3
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
4
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
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