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3181

How much heat is required to convert 5.0g of ice at 0 ° C to water at the boiling point? (Specific latent heat of ice = 336Jg-1 specific heat capacity of water = 4.2Jg-1K-1)

  • A. 420 J
  • B. 1680 J
  • C. 1701 J
  • D. 2100 J
  • E. 3780 J
View Answer & Discuss (7) NECO 2001
3182
What gives rise to the line spectra observed in atoms?
  • A. change of an electron from a higher to a lower energy level in the atom
  • B. disturbed protons in the nucleus
  • C. excitation of an electron in the atom
  • D. kinetic energy of a moving atom
  • E. potential energy of an electron inside an atom
View Answer & Discuss (4) NECO 2001
3183
A lead-acid accumulator is used in preference to a dry battery in a car because
  • A. a dry battery cannot supply the necessary high voltage
  • B. a dry battery would not operate on a cold frosty morning
  • C. the accumulator can give a bigger current and can be recharged
  • D. the accumulator can supply a.c
  • E. the chemicals used in a dry battery constitute a fire hazard.
View Answer & Discuss (4) NECO 2001
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3184

A metal has a work function of 3.0 eV. What is the threshold frequency of the metal when electrons are just liberated from the metal.(1 eV = 1.6 × 10-19J; h = 6.6 × 10-34Js)

  • A. 4.8 × 10-19Hz
  • B. 9.3 × 10-7Hz
  • C. 4.8 × 1014Hz
  • D. 7.3 × 1014Hz
  • E. 9.3 × 1014Hz
View Answer & Discuss (1) NECO 2001
3185
A body whose initial velocity is u is uniformly accelerated to a final velocity v in t seconds. If the distance travelled is s, and the acceleration is a, which equation is INCORRECT for the motion of the body?
  • A. s = ut+\(\frac{1}{2}\)at2
  • B. v2 = u2 + 2as
  • C. v =u + at
  • D. v = u + 2as
  • E. s = \(\frac{1}{2}\)(u+v)t
View Answer & Discuss (2) NECO 2001
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