1
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Two sources P and Q produce notes of frequency 660 Hz. each. A listener moves from P to Q with a speed of 1 ms$$-$$1. If the speed of sound is 330 m/s, then the number of beats heard by the listener per second will be
A
4
B
8
C
2
D
zero
2
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to
A
$$-$$Q/4
B
Q/4
C
$$-$$Q/2
D
Q/2
3
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
An electric dipole of dipole moment p is aligned parallel to a uniform electric field E. The energy required to rotate the dipole by 90o is
A
p2 E
B
pE
C
infinity
D
pE2
4
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
Two rods are joined end to end, as shown. Both have a cross-sectional area of 0.01 cm2. Each is 1 meter long. One rod is of copper with a resistivity of 1.7 $$ \times $$ 10$$-$$6 ohm-centimeter, the other is of iron with a resistivity of 10$$-$$5 ohm-centimeter.
NEET 2013 (Karnataka) Physics - Current Electricity Question 82 English
How much voltage is required to produce a current of 1 ampere in the rods?
A
0.00145 V
B
0.0145 V
C
1.7 $$ \times $$ 10$$-$$6 V
D
0.117 V
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