The NULL is a macro defined in C. Null pointer actually means a pointer that does not point to any valid location. We define a pointer to be null when we want to make sure that the pointer does not point to any valid location and not to use that pointer to change anything. If we don't use null pointer, then we can't verify whether this pointer points to any valid location or not.
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The number of micro-amperes in 2 milliamperes is A. 2 µA B. 20 µA C. 200 µA D. 2,000 µA
The number of millivolts in 0.06 kilo-volts is A. 600 V B. 6,000 mV C. 60,000 mV D. 600,000 mV
The quantity 3.3 × 103 is the same as A. 330 B. 3,300 C. 33,000 D. 0.0033
When converting 0.16 mA to micro-amperes, the result is A. 16 µA B. 160 µA C. 1,600 µA D. 0.0016 µA
When these numbers are added, (87 × 105) + (2.5 × 106), the result is A. 1.12 × 104 B. 11.2 × 105 C. 112 × 105 D. 1,120 × 106
The number 4.38 × 10-3 expressed as a number having a power of 10-6 is A. 4,380 × 10-6 B. 438 × 10-6 C. 43,800 × 10-6 D. 438,000 × 10-6
The number 3.2 × 10-5 A expressed using a metric prefix is A. 32 µA B. 3.3 µA C. 320 mA D. 3,200 mA
The core of a coil has a length of 10 cm. The self inductance is 8 mH. If the core length is doubled, all other quantities remaining the same, the self inductance will be A. 32 mH B. 16 mH C. 8 mH D. 4 mH
Diamond is a paramagnetic material. A. True B. False
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