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3251

An a.c. generator can be converted into a d.c. generator by replacing

A. the slip rings with split-ring commutators
B. the slip rings with armatures
C. the split-rings with slip rings
D. the split-rings with brushes
E. the brushes with slip-ring commutators.

View Answer & Discuss (1) NECO 2002

3252

It is NOT possible to determine exactly and simultaneously the position and momentum of a particle. This statement is known as the

A. Crompton effect
B. de Broglie’s laws
C. Frank-Hertz experimental law
D. Heisenberg’s uncertainly principle
E. wave-particle paradox

View Answer & Discuss (1) NECO 2002

3253

An air bubble of volume 4cm\(^3\) is formed 20m under water. What will be its volume when it rises to just below the surface of the water if the atmospheric pressure is equivalent to a height of 10m of water?

A. 2cm³
B. 4cm³
C. 6cm³
D. 8cm³
E. 12cm³

View Answer & Discuss (6) NECO 2002

3254

A platinum-resistance thermometer has a resistance of 10 ω at 0°C and 18 ω at 100°C. Assuming that resistance changes uniformly with temperature, what is the resistance of the thermometer when the temperature is 45°C?