## Physics 2010 | Study Mode

Question 41
A
5 A
B
4 A
C
3 A
D
2 A
Explanation.
I = E/(R+r)
= 12/6 = 2A

Question 42
A
75.0 cm
B
66.7 cm
C
33.3 cm
D
25.0 cm
Explanation.
1/R = 1/8 + 1/8 = 2/8
R = 4
l/l1 = R/R1
(x)/(100-x) = 4/8
4(100-x) = 8x
400-4x = 8x
400 = 8x + 4x = 12x
x = 400/12 = 33.3cm

Question 43
A
14 A
B
12 A
C
10 A
D
8 A
Explanation.
1/R = 1/4 + 1/4 + 1/4 = 3/4
R = 4/3
I = V/R
 = 16 4/3

 = 16 x 3 _4

= 12 A

Question 44
A
N1,920.00
B
N192.00
C
N19.20
D
N1.92
Explanation.
Energy consumed = power x time
= 200W x 24hr = 4800wh
= 4.8 kwh
But 1 kwh cost N40
4.8kwh costs 4.8 x 40
= N192

Question 45
A
south and north
B
north and south
C
north and north
D
south and south
Explanation.
IN magnetisation by stroking, the last touched has a pole opposite to that of the magnet used. Therefore, the poles T and V are N and N respectively

Question 46
A
the energy released
B
the electrochemical equivalent
C
the current flowing
D
the charge released
Explanation.
M = It = Q
Where M is the mass of substance deposit . Q is the quantity of charge. A graph of m against Q is a straight line passing through the origin with slope equal to the electrochemical equivalent.Z

Question 47
A
315 - 11
B
$$\frac{3\sqrt {15} - 11}{2}$$
C
315 + 11
D
$$\frac{3\sqrt {15} + 11}{2}$$
Explanation.
$$\frac{2\sqrt{3}} + \sqrt{5}}{\sqrt{5} - \sqrt{3}$$ = $$\frac{\sqrt{5}} + 2\sqrt{3}}{\sqrt{5} - \sqrt{3}$$ x $$\frac{\sqrt{5}} + \sqrt{3}}{\sqrt{5} + \sqrt{3}$$

$$\frac{5 + \sqrt{15} + 2\sqrt{15} + 2 \times 3}{(\sqrt{5} - \sqrt{3})^2$$

= $$\frac{5 + 3\sqrt{15} +6} {5 - 3)$$

= $$\frac{11 + 3\sqrt{15}}{2}$$

Question 48
A
Both the mass and weight are constant
B
Both the mass and weight vary
C
the mass is constant while the weight varies
D
the weight is constant while the mass varies
Explanation.
The weight of a body is the resultant of earth's gravitational pull on it. The earth is not a perfect sphere, it is more flattened at the poles and bulges at the equator. Hence an object at the pole is closer to the earth's center than the one at the equator. The weight of a body at the poles should be more than that of when weighed at the equator.

Thus weight varies from place to place while the mass of a body being the quantity of matter it contains remains the same at different points on the earth.

Question 49
A
215 and 88
B
91 and 227
C
227 and 91
D
92 and 238
Explanation.

No official Explanation yet!

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