Physics 2005 NECO Past Questions

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An atom radiates 1.5 × 10^-19J when an electron jumps from one level to another. What is the wavelength of the emitted radiation? (Planck’s constant 6.6 × l0^-34Js ; Speed of light in vacuum = 3.0 × 108ms^-1)

A. 1.32 × 10^-6m
B. 2.97 × 10^-6m
C. 3.30 × 10^-6m
D. 6.82 × 10^-6m
E. 8.01 × 10m^-6

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The following are derived units EXCEPT

A. kg m^-3
B. N
C. Ns
D. m³
E. kg

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A 12V battery supplies a current of 0.4A to a lamp. Calculate the resistance of the lamp.

A. 30.00
B. 4.80
C. 3.00
D. 0.30
E. 0.03

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In which of the following is the expansion of solids a disadvantage?

A. Electric iron
B. Fire alarm
C. The balance wheel of a watch
D. The bimetallic thermometer
E. The fitting of wheels in rims

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Which of the following is a desirable property of a fuse Wire?

A. High expansively
B. High thermal conductivity
C. Low density
D. Low electrical resistivity
E. Low melting point

View Answer & Discuss (8) NECO 2005

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