1
IIT-JEE 2006
MCQ (Single Correct Answer)
+3
-1

A point object is placed at a distance of 20 cm from a thin plano-convex lens of focal length 15 cm , if the plane surface is silvered. The image will form at

IIT-JEE 2006 Physics - Geometrical Optics Question 4 English
A

60 cm left of AB

B

30 cm left of $A B$

C

12 cm left of AB

D

60 cm right of AB

2
IIT-JEE 2006
MCQ (Single Correct Answer)
+3
-1

A biconvex lens of focal length $f$ forms a circular image of sun of radius $r$ in focal plane. Then

A

$\pi r^2 \propto f$.

B

$\pi r^2 \propto f^2$.

C

if the lower half part is covered by black sheet, then the area of the image is equal to $\frac{\pi r^2}{2}$.

D

if f is doubled intensity will increase.

3
IIT-JEE 2006
MCQ (Single Correct Answer)
+3
-1

Graph of position of image versus position of point object from a convex lens is shown. Then, the focal length of the lens is

IIT-JEE 2006 Physics - Geometrical Optics Question 6 English
A

$0.50 \pm 0.05 \mathrm{~cm}$

B

$0.50 \pm 0.10 \mathrm{~cm}$

C

$5.00 \pm 0.05 \mathrm{~cm}$

D

$5.00 \pm 0.10 \mathrm{~cm}$

4
IIT-JEE 2006
MCQ (Single Correct Answer)
+3
-1

A massless rod is suspended by two identical strings AB and CD of equal length. A block of mass $m$ is suspended from point $O$ such that BO is equal to $x$. Further, it is observed that the frequency of 1st harmonic (fundamental frequency) in AB is equal to 2 nd harmonic frequency in CD. Then, length of BO is

IIT-JEE 2006 Physics - Waves Question 2 English
A

$\frac{\mathrm{L}}{5}$

B

$\frac{4 \mathrm{~L}}{5}$

C

$\frac{3 \mathrm{~L}}{4}$

D

$\frac{\mathrm{L}}{4}$

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