1
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter $${d \over 2}$$ in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively
A
$$f\,$$ and $${I \over 4}$$
B
$${{3f} \over 4}$$ and $${I \over 2}$$
C
$$f$$ and $${{3I} \over 4}$$
D
$${f \over 2}$$ and $${I \over 2}$$
2
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
A potentiometer circuit is set up as shown. The potential gradient, across the potentiometer wire, is k volt/cm and the ammeter, present in the circuit, reads 1.0 A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at length $$l$$1 cm and $$l$$2 cm respectively. The magnitudes, of the resistors R and X, in ohms, are then, equal, respectively, to

AIPMT 2010 Prelims Physics - Current Electricity Question 77 English
A
$$k({l_2} - {l_1})$$ and $$k{l_2}$$
B
$$k{l_1}$$ and $$k({l_2} - {l_1})$$
C
$$k\left( {{l_2} - {l_1}} \right)$$ and $$k{l_1}$$
D
$$k{l_1}$$ and $$k{l_2}$$
3
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency $$f$$ Hz. The magnitude of magnetic induction at the center of the ring is
A
$${{{\mu _0}qf} \over {2\pi R}}$$
B
$${{{\mu _0}qf} \over {2R}}$$
C
$${{{\mu _0}q} \over {2fR}}$$
D
$${{{\mu _0}q} \over {2\pi fR}}$$
4
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be
A
900 $$\Omega $$
B
1800 $$\Omega $$
C
500 $$\Omega $$
D
1000 $$\Omega $$
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