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76. A copper wire has resistance of 8 ohm. The wire is stretched to double of its original length. Its new resistance will be (NTSE Bihar, Stage-I, 2016-17)
8 ohm
16 ohm
32 ohm
64 ohm
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77. An electric bulb is marked (60 W, 120 V). What is the resistance of filament of bulb? (NTSE Bihar, Stage-I, 2016-17)
2 Ω
30 Ω
240 Ω
720 Ω
78. A battery whose emf is 40 V has an internal resistance 5 Ω. If this battery is connected across a 15 Ω resistor (R), what will be voltage drop across resistor (R)? (NTSE Bihar, Stage-I, 2016-17)
10 V
30 V
40 V
50 V
79. Three resistors of resistance are joined in parallel. The equivalent resistance of combination will be (NTSE Bihar, Stage-I, 2016-17)
Ω
110 Ω
10 Ω
80. A conducting wire of certain length has its resistance R1. When it is stretched to have its diameter reduced to half its original value, what would be its new resistance R2 in comparison to R1? (NTSE Odisha, Stage-I, 2015-16)
R2 = 16R1
R2 = 8R1
R2 = 4R1
R2 = 2R1
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are joined in parallel. The equivalent resistance of combination will be 
Ω
Ω