physics

The electrolyte in the Nickei-iron (Nife) accumulator is?

A. potassium hydroxide solution B. dilute tetraoxosulphate(VI)acid C. copper tetraoxosulphate(VI)solution D. ammonium chloride solution Correct Answer: Option A = potassium…

4 years ago

When an a.c. voltage is applied to a capacitor; no power is consumed because the current?

A. leads the voltage by 90° B. lags behind the voltage by 90° C. and voltage are in phase D.…

4 years ago

If the capacitance of an capacitor is C = (εA)/d; which of the following parameters is varied when a variable capacitors is used for tuning radio sets?

A. constant (ε) and area B. area and distance. C. constant (ε) only D. distance only Correct Answer: Option B…

4 years ago

An electric heater with a p.d of 240 V connected across its terminals has a total resistance of 960Ω. find the power rating of the heater.

A. 0.25 W B. 4.00 W C. 38.40W D. 60.00W Correct Answer: Option D = 60.00W Explanation Electrical power =…

4 years ago

The main purpose of the transformer in an a.c radio set is to?

A. increase power to the radio B. step up the voltage C. convert energy from a.c to d.c D. step…

4 years ago

An immersion heater rated 2.0A; 240V is used to boil water from temperature 52°C to 100°C. If the mass of the water is 2.5kg. determine the time taken to boil the water. [specific heat capacity of water = 4.2 x 10³ jkg−¹ k−¹ ]

A. 1.05 x 103s B. 1.05 x 105s C. 1.05 x 102s D. 1.05 x 104s Correct Answer: Option A…

4 years ago

The thermometric property of a constant volume thermometer is?

A. change in volume B. differential expanssion C. change in pressure D. change in length Correct Answer: Option C =…

4 years ago

If the relative density of gold is 19.2; the volume of 2.4kg of gold is?

A. 8.00 x 10-3 m3 B. 1.25 x 10-4 m3 C. 1.92 x 10-4 m3 D. 4.61 x 10-3 m3 Correct Answer: Option B…

4 years ago

At low humidity in an environment; the human skin is usually?

A. damp and rough B. damp and smooth C. dry and rough D. dry and smooth Correct Answer: Option C…

4 years ago

A uniform solid cube material 10cm on each side of mass 700g is submerged in water. Which of the following best described the behavior of the cube water?

A. the cube will melt after a period of time B. the cube will float C. the cube will sink…

4 years ago
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