The figure below shows three capacitors, 2μF, 3μF and 6μF connected in series. If the p.d across the system is 12V, the p.d, across the 6μF capacitor is

• A. 4V
• B. 12V
• C. 2V
• D. 6V

Which of the following is the most suitable for use as an altimeter?

• A. A mecury barometer
• B. A fortin barometer
• C. A mecury manometer
• D. An aneroid barometer

When a ray of light is incident normally on an air- glass interface, its angle of refraction is

• A. 0°
• B. 42°
• C. 45°
• D. 60°

Calculate the temperature of 6 moles of an ideal gas at a pressure of 7.6 x 10⁶Nm^-2 with a volume of 10^-3m³. [R = 8.3jmo^l-1K^-1]

• A. 201^oC
• B. 126^oC
• C. 153^oC
• D. 185^oC

Which of the following factors will affect the velocity of sound?

• A. An increase in the pitch of the sound
• B. An increase in the loudness of the sound
• C. Wind travelling in the same direction of the sound
• D. A change in the atmospheric pressure at constant temperature

Which of the following statements about the 3rd overtone of a vibrating air column of an open pipe is correct? It has

• A. 4 nodes
• B. 5 nodes
• C. 3 antinodes
• D. 4 antinodes

A spiral spring has a length of 14cm when a force of 4N is hung on it. A force of 6N extends the spring by 4cm. Calculate the unstretched length of the spring

Give three observations in support of de Broglie's assumption that moving particles behave like waves.

The speed of an object in rectilinear motion can be determine from the

• A. area under a velocity-time graph
• B. area under a distance-time graph
• C. slope of a distance-time graph
• D. slope of a velocity-time graph

The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20℃ and 80℃ respectively is

• A. 3.0 x 10²Km^-1
• B. 3.0 x 10³Km^-1
• C. 5.0 x 10³Km^-1
• D. 3.0 x 10⁴Km^-1