1
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

The equation of a progressive wave can be given by $$y=15\sin(660\pi t-0.02\pi x)$$ cm. The frequency of the wave is

A
330 Hz
B
342 Hz
C
365 Hz
D
660 Hz
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A source of sound gives 5 beats per second, when sounded with another source of frequency 100 s$$^{-1}$$. The second harmonic of the source, together with a source of frequency 205 s$$^{-1}$$ gives 5 beats per second. What is frequency of the source?

A
95 s$$^{-1}$$
B
105 s$$^{-1}$$
C
100 s$$^{-1}$$
D
205 s$$^{-1}$$
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A charge of 0.8 C is divided into two charges Q$$_1$$ and Q$$_2$$. These are kept at a separation of 30 cm. The force on Q$$_1$$ is maximum when

A
$$Q_1=Q_2=0.4$$ C
B
$$Q_1 \approx 0.8$$ C, $$Q_2$$ negligible
C
$$Q_1$$ negligible, $$Q_2 \approx 0.8$$ C
D
$$Q_1=0.2$$ C, $$Q_2=0.6$$ C
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

An electric dipole has a pair of equal and opposite point charges $$q$$ and $$-q$$ separated by a distance $$2x$$. The axis of the dipole is defined as

A
direction from positive charge to negative charge
B
direction from negative charge to positive charge
C
perpendicular to the line joining the two charges drawn at the centre and pointing upward direction
D
perpendicular to the line joining the two charges at the centre and pointing downward direction
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