In alternating current theory, the units of impedance, r.m.s. voltage and resonance frequency are respectively equal to

• A. volt, ampere and hertz
• B. ohms, volt and hertz
• C. watt, ohms and radian
• D. ohms, hertz and joule

Which of the following properties is an advantage of lead-acid accumulator over an alkaline accumulator?

• A. possesses low internal resistance
• B. can be recharges
• C. has shorter life span
• D. possesses high e.m.f

a ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2m^-1 and rebounds with the same speed. Determine the impulse experienced by the ball

• A. 20.0kgm^-1
• B. 5.0kgm^-1
• C. 1.3kgm^-1
• D. 0.0kgm^-1

water is a poor thermometric liquid because it

• A. is opaque
• B. is a poor conductor
• C. wets glass
• D. has low vapour pressure

When the pointed end of an uncharged optical pin is brought near the cap cf a positively charged electroscope, it is observed that the gold

• A. collapse slowly
• B. vibrate
• C. are not affected
• D. diverge rapidly

(a) Explain the following terms:

(i) viscosity;

(ii) terminal velocity.

(b)(i) Describe an experiment to determine the terminal velocity of a steel ball falling through a jar of glycerine..

(ii) State two precautions that should be taken to ensure accurate result.

(c) State two

(i) effects of viscosity

(ii) applications of viscosity.

500g of water is heated so that its temperature rises from 30°C to 72°C in 7 minutes. calculate the supplied per minute. (Specific heat capacity of water is 4200J\(kg^{-1}K^{-1}\)

• A. 9000J
• B. 12600J
• C. 21000J
• D. 25200J

A reservoir 500 m deep is filled with a fluid of density 850 kgm^-3. If the atmospheric pressure is 1.05 x 10⁵ Nm^-2, the pressure at the bottom of the reservoir is. [g = 10ms^-2]

• A) 4.72 x 10⁶ Nm^-2
• B) 4.36 x 10⁶ Nm^-2
• C) 4.28 x 10⁶ Nm^-2
• D) 4.25 x 10⁶ Nm^-2

Alcohol of mass 21g and density 0.7g cm^-3 is mixed with 10g of water. Determine the density of the mixture [density of water = 1.0gcm^-3]

• A. 0.775gcm^-3
• B. 0.875gcm^-3
• C. 0.780gcm^-3
• D. 0.880gcm^-3

Induced emfs are best explained using

• A. Ohm's law
• B. Faraday's law
• C. Colomb's law
• D. Lenz's law