Physics 2009 | Study Mode

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Question 41
A
4.99 x 105 Nm-2
B
9.80 x 103 Nm-2
C
4.98 x 103 Nm-2
D
9.80 x 105 Nm-2
Explanation
PV = nRT
P = nRT = 2 x 8.313 x 300
_V___10-2

= 4.987 x 105 Nm-2

Correct option: A
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Question 42
A
reflection
B
deflection
C
diffraction
D
refraction
Explanation
Diffraction is spreading of wave after passing through a slit

Correct option: C
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Question 43
A
20 Nm-1
B
40 Nm-1
C
30 Nm-1
D
10 Nm-1
Explanation
F = Ke (Hooks law)
K = F/e = 80/4
= 20 Nm-1

Correct option: A
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Question 44
A
3.0 x 1014 Hz
B
6.0 x 1014 Hz
C
6.0 x 1012 Hz
D
2.5 x 1014 Hz
Explanation
f = c/
f = c = 3 x 108
500 x 109

=6.0 x 1014 Hz

Correct option: B
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Question 45
A
12 V
B
8 V
C
2 V
D
36 V
Explanation
1/R = 1/R1 + 1/R2 = 1/3 + 1/6
= 3/6
R = 6/3 = 2
E = I(R + r) = 4(2 + 0) = 8v

Correct option: B
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Question 46
A
116.3 V
B
50.0 V
C
230.0 V
D
106.3 V
Explanation
V =
(v1 + v2)2 + VR2



V =
(40 + 110)2 + 802


V =
(-70)2 + 802

=
4900 + 6400

=
11300

= 106.3v

Correct option: D
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Question 47
A
\(\frac{-5}{4}\)
B
\(\frac{-5}{6}\)
C
o
D
5
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: D
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Question 48
A
2700
B
450
C
900
D
1800
E
No Correct Option
Explanation
Comparing y = 10Sin\( (1000\pi t - \frac{\pi x}{34} ) \\
\text{With } y = a \text{Sin }(net - kx)\\
K = \frac{\pi}{34}, \text{and phase difference}\\

J = KAC = \frac{\pi}{34} \times 1.53rad.\\

\text{But} \pi rad = 180^0 \\
\text{Therefore } \frac{1.53rad}{34} = \frac{1.53 \pi}{34} \times \frac{1}{\pi} \times 180^0 \\
=8.1^0 \)

Correct option: E
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Question 49
A
0.200m
B
8.000m
C
0.125m
D
2.100m
E
No Correct Option
Explanation
The person's image distance v will be at the distance of 0.1m = 10cm for him to see objects at a distance of u.F = 5.0cm

\( \frac{1}{v} + \frac{1}{u} = \frac{1}{f} \implies \frac{1}{10} + \frac{1}{u} = \frac{1}{5} \\

\frac{1}{u} = \frac{1}{5} - \frac{1}{10} = \frac{2-1}{10} = \frac{1}{10} \\

\text{therefore } u = 10cm = 0.1m \)

Correct option: E

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