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3421
The most suitable instrument for measuring the diameter of a thin wire is a
  • A. meter rule
  • B. micrometer screw gauge
  • C. pair of dividers
  • D. pair of engineer’s calipers
  • E. venire calipers
View Answer & Discuss NECO 2005
3422
An immersion heater is rated 1500W. How long does it take the heater to raise the temperature of 1 kg of water by 30°C? (Assume heat lost to the surrounding is negligible, Specific heat capacity of water 4200Jkg-1K-1)
  • A. 84s
  • B. 112s
  • C. 130s
  • D. 168s
  • E. 280s
View Answer & Discuss (2) NECO 2009
3423
The equation PxVyTz = Constant is Charles’ law if
  • A. x = 0, y = 1 and z = -1
  • B. x = 0, y = -1 and z = 1
  • C. x = 1, y = 1 and z = 0
  • D. x = 1, y = 1 and z = -1
  • E. x = 1, y = 1 and z = 1
View Answer & Discuss NECO 2009
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3424

When a resistor of resistance R is connected across a.c. the terminal p.d. of the cell is reduced to three-quarter its e.m.f. The cell’s internal resistance in terms of R is

  • A. \(\frac{R}{4}\)
  • B. \(\frac{R}{3}\)
  • C. \(\frac{R}{2}\)
  • D. 2\(\frac{R}{3}\)
  • E. R
View Answer & Discuss (14) NECO 2009
3425

Which of the following cells does not require a dipolar for effective and efficient delivery of current?

  • A. Daniel cell
  • B. Dry Leclanche cell
  • C. Nickel-iron accumulator
  • D. Voltaic cell
  • E. Wet Leclanche cell
View Answer & Discuss (3) NECO 2009
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