1
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
A wave in a string has an amplitude of 2 cm. The wave travels in the +ve direction of x axis with a speed of 128 m/s. and it is noted that 5 complete waves fit in 4m length of the string. The equation describing the wave is
A
y = (0.02) m sin (15.7 x $$-$$ 2010t)
B
y = (0.02) m sin (15.7 x + 2010t)
C
y = (0.02) m sin (7.85 x $$-$$ 1005t)
D
y = (0.02) m sin (7.85 x + 1005t)
2
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
Three concentric spherical shells have radii a, b and c (a < b < c) anf have surface charge densities $$\sigma $$, $$-$$$$\sigma $$ and $$\sigma $$ respectively. If VA, VB and VC denote the potentials of the three shells, then, for c = a + b, we have
A
VC = VB $$ \ne $$ VA
B
VC $$ \ne $$ VB $$ \ne $$ VA
C
VC = VB = VA
D
VC = VA $$ \ne $$ VB
3
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
Three capacitors each of capacitance C and of breakdown voltage V are joined in series. The capacitance and breakdown voltages of the combination will be
A
$$3C,{V \over 3}$$
B
$${C \over 3},3V$$
C
$$3C,3V$$
D
$${C \over 3},{V \over 3}$$
4
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
If the dimensions of a physical quantity are given by MaLbTc, then the physical quantity will be
A
velocity if   a = 1, b = 0, c = $$-$$1
B
acceleration if   a = 1, b = 1, c = $$-$$2
C
force if   a = 0, b = $$-$$1, c = $$-$$2
D
pressure if   a = 1, b = $$-$$1, c = $$-$$2
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