# Physics 2011 | Study Mode

Question 41
A
Z only
B
X only
C
Y and Z
D
Y and X
Explanation.
Under neutral equilibrium, the body rolls and the position of the center of gravity , C. G is neither raised nor lowered

Question 42
A
10 cm
B
25 cm
C
16 cm
D
14 cm
Explanation.
m = v/u = -3
v = -3u
f = 15cm
1/v + 1/U = 1/f
1/-3U + 1/u = 1/15
2/3u = 1/15
3U = 15 x 2
U = 30/3
= 10 cm

Question 43
A
 _q2 4or2
B
 _q2 4or
C
 _q 4or2
D
 _q 4or
Explanation.
Electric potential is work done in taking a unit mass or charge from infinity to that point
 V = w = Fr = Q1Q2 x r Q Q 4or2 Q1

 = _q 4or

Question 44
A
306 Hz
B
512 Hz
C
488 Hz
D
356 Hz
Explanation.
f1 = 255Hz, T1 = 225N
f2 = ? T2 = 324N
But f T => f = KT
=> K = f/T
f1/T1 = f2/T2
225/225 = f2/324
 f2 = 225225 225

 = 225 x 18 __15

= 306Hz

Question 45
A
14.4 A
B
1.0 A
C
3.2 A
D
9.6 A
Explanation.
 I V R

 = 12 12

= 1A

Question 46
A
Graham's Law
B
Boyle's Law
C
Pressure law
D
Charles Law
E
No Correct Option
Explanation.
Rate of diffusion is inversely proportional to the square root of density - Graham's law

$$P \propto \frac{1}{v}$$ at constant temperature - Boyle's law

$$P \propto T$$ at constant volume - Pressure law

$$P \propto T$$ at constant pressure - Charles law

therefore no correct option

Question 47
A
Parallel connections do not heat up the wires
B
series connections use high voltage
C
less current will be used
D
less voltage will be used
Explanation.
if appliances are connected in series, the effective voltage is the sum of individual voltages which will be high.

Question 48
A
2
B
$$\frac{1}{2}$$
C
$$\frac{1}{\sqrt{2}}$$
D
$$\sqrt{2}$$
Explanation.
Irms = $$\frac{I_0}{\sqrt{2}}$$

$$\text{Therefore } \sqrt{2Irms} = I_0 \\ \frac{Irms}{I_0} = \frac{1}{\sqrt{2}}$$

Question 49
A
5:3
B
1:50
C
50:1
D
3:5
E
No Correct Option
Explanation.

No official Explanation yet!

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