# Physics 2008 | Study Mode

Question 41
A
275N
B
325N
C
375N
D
573N
##### Explanation
VR = No. of pulleys = 4
Efficiency = M.A/V.R x 100% = load
Effort x 100%_V.R
80 = 1200 x 100 x 1100__Effort4
Effort = 1200 x 100 = 375N_80 x 4

Question 42
A
melting region
B
boiling region
C
sublimation region
D
evaporating process
##### Explanation
At melting point there is no change temperature

Question 43
A
parallel to OX
B
parallel to OY
C
60o to OX
D
60v to OY
##### Explanation
Particles of the transmitting medium in transverse wave oscillate in a direction perpendicular to the propagation of the wave

Question 44
A
10 cm
B
15 cm
C
20 cm
D
25 cm
##### Explanation
Magnifications = V/U = 4
V = 4U
1/V + 1/U = 1/f
1/4u + 1/U = 1/12
5/4U = 1/12
4U = 12 x 5 = 60
U = 15 cm

Question 45
A
6
B
12
C
18
D
24
##### Explanation
The resistors are in series
Reff = R1 + R2 + .....
= 4 + 4 + 4 + 4 + 4 + 4 = 24

Question 46
A
0.35mH
B
3.50mH
C
2.90mH
D
35.0mH
##### Explanation
Left = L1 + L2 + L3
= 5mH + 10mH + 20mH = 35mH

Question 47
A
1.22 x 10-11m
B
3.87 x 10-10m
C
2.27 x 1011m
D
2.27 x 1014m
##### Explanation
 = __h (2evm)

 = ____6.6 x 10-34 (2 x 1.6x10-19 x 10000 x 9.1x10-34)

1.223 x 10-11m

Question 48
A
a proton
B
a neutron
C
an - particle
D
a - particle
##### Explanation
for the conversion of mass 14 + 4 = 17 + x
X = 18 - 17 = 1
for conservation pf charge:7 + 2 = 8 + y
y = 9 - 8 = 1
Thus, the element is 11X which is equal to hydrogen nucleus ( proton)

Question 49
A
ML2T-3I-1
B
ML2T-3I-2
C
M2LT-2I-1
D
M2L2T-1I-1
##### Explanation
Electrical work W = QE,
Where Q is the quantity of change and E is the electromotive force.
E = W = FxDQ_It
Where D is the displacement,I = current and t = time
But dimension of force,
= unit of mass x unit of Acceleration
= unit of mass xunit of velocityunit of time
= unit of mass x unit of displacement__unit of time x unit of time
ML/T2 = MLT-2
Dimension of emf E
= MLT-2L = ML2T-3I-1__IT

Question 50
A
o
B
1
C
2
D
4
##### Explanation
0, 0, 1, 1, $$\bigcirc{2}$$, 4, 4, 4, 4

median = 2

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