246.
A.
2 m/s
B.
4 m/s
C.
8 m/s
D.
12 m/s
Correct answer is C
| v | = | d
t |
or | v | α | d |
d = x, v = 4m/s
d = 2x, v = ? (girl & image)
| v | = | 2 × 4
x |
= | 8 | m
s |
247.
A.
1.6cm
B.
16.0cm
C.
20.0cm
D.
25.0cm
Correct answer is D
Devices with different liquids
d\(_1\)h\(_1\) = d\(_2\)h\(_2\)
1 × 20 = 0.8 × h
| h | = | 20
0.8 |
= | 25cm |
248.
In semi-conductor, the carriers of current at room temperature are
A.
electrons only
B.
electrons and holes
C.
holes only
D.
electron and ions
Correct answer is B
Electron and holes represents the negative and positive charge respectively.
249.
A.
5W
B.
6W
C.
7W
D.
8W
Correct answer is A
I = 1A, F = 800 cycles/s = 800Hz
R = 5Ω, L = 2.5mH
P = I\(^2\)R = I\(^2\) × 5 = 5W
250.
A.
0.71V
B.
0.7V
C.
0.82V
D.
0.8V
Correct answer is A
Req = 200 + 500 + 1000 = 1700Ω
| P.d | (across | 200Ω) | = | 200
1700 |
× | 6 | = | 0.71V |
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