1
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80%, the current drwn by the primary windings of the transformer is
A
3.6 ampere
B
2.8 ampere
C
2.5 ampere
D
5.0 ampere
2
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
Which of the following statement is false for the properties of electromagnetic waves ?
A
Both electric and magnetic field vectors attain the maxima and minima at the same place and same time.
B
The energy in electromagnetic wave is divided equally between electric and magnetic vectors.
C
Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave.
D
These waves do not require any material medium for propagation.
3
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 $${I \over 2}$$
4
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
Consider the following two statements.
(A)  Kirchoff's junction law follows from the conservation of charge.
(B)  Kirchhoff's loop law follows from the conservation of energy.

Which of the following is correct?
A
Both (A) and (B) are wrong
B
(A) is correct and (B) is wrong
C
(A) is wrong and (B) is correct
D
Both (A) and (B) are correct
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