Question 4431:

• NECO 2002

An air bubble of volume 4cm³ 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 10cm of water?

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

Question 4432:

• NECO 2002

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?

A. 27.8
B. 17.8
C. 13.6
D. 6.4
E. 3.6

Question 4433:

• NECO 2002

The silvered walls of a vacuum flask minimise loss of heat due to ____________

A. Conduction and convection
B. Conduction only
C. Convection and radiation
D. Convection only
E. Radiation only

Question 4434:

• NECO 2002

The phenomenon of photoelectric effect is NOT used in ____________

A. Automatic doors
B. Bimetallic strip thermometers
C. Light meters in cameras
D. Setting off burglar alarms
E. Sound production from film tracks.

Question 4435:

• NECO 2002

Which of the following is a percussion instrument?

A. Bell
B. Flute
C. Guitar
D. Piano
E. Organ