The total resistance measured at PQ in the diagram below is

• A. 18.0Ω
• B. 11.0Ω
• C. 4.0Ω
• D. 2.0Ω

Lamps in domestic lightings are usually in

• A. series
• B. divergent
• C. convergent
• D. parallel

The set-up illustrated above shows a capillary tube of uniform cross-sectional area in two different arrangements. Using the data in the diagrams. Calculate the pressure of the atmosphere

• A. 76cm of Hg
• B. 75cm of Hg
• C. 74cm of Hg
• D. 60cm of Hg

Which of the following components is used for storing electric charges?

• A. inductor
• B. resistor
• C. capacitor
• D. electrometer

A 5-v battery is connected across the plates of a 2.0\(\mu\)F uncharged parallel plate capacitor. The charge on the capacitor after a long time is

• A. 2.5\(\mu\)C
• B. 10.0\(\mu\)C
• C. 20.0\(\mu\)C
• D. 50.0\(\mu\)C

a. Using the kinetic theory, explain the term diffusion of fluid molecules.

b. Name one phenomenon that demonstrates that light behaves as a:

i. wave ii. particles

The main reason why a.c. is transmitted at very high voltage and low current is that

• A. flows faster through the conductor A. flows faster through the conductor
• B. can be stepped down C. is cheaper to generate D. reduces heat loss. can be stepped down
• C. is cheaper to generate
• D. reduces heat loss

A radioactive isotope has a decay constant of 10-5s4. Calculate half life

• A) 6.93 x 105s
• B) 6.93 x 105s
• C) 6.93 x104s
• D) 6.93 x 104s

The instrument used to measure the pressure of a gas is

• A. barometer
• B. thermometer
• C. hydrometer
• D. manometer

Two simple pendulum A and B of equal lengths and of masses 5g and 20g respectively are located in the same environment. The periods TA and TB of their respective oscillations are related by the equations

• A. T_A = 4T_B
• B. T_A = \(\frac{1}{4} T_B\)
• C. T_A = T_B
• D. T_A = 5T_B