physics

Which of the following statements is true of the properties of a moving coil galvanometer?

A. THe coil has a small area B. There are strong hair springs to gives a large control panel C.…

4 years ago

At what frequency would a capacitor of 2.5μF used in radio circuit have a resistance of 250Ω?

A. π/800 Hz B. 800/π Hz C. 200π Hz D. 2000π Hz Correct Answer: Option B - 800/π Hz Explanation…

4 years ago

The carbon-granules microphone works on the principle of change in?

A. inductance B. resistance C. capacitance D. voltage Correct Answer: Option B - resistance

4 years ago

A transistor is used in the amplification of signals because it?

A. controls the flow of current B. consumes a lot of power C. allows doping D. contains electron and hole…

4 years ago

The particle that is responsible for the nuclear fission in a nuclear reactor is?

A. neutron B. prton C. electron D. photon Correct Answer: Option A - neutron Explanation In a nuclear reaction, neutron…

4 years ago

From the generating station to each substation power is transmitted at a very high voltage so as to reduce?

A. hysteresis loss B. eddy current loss C. magnetic flux leakage D. heating in the cells Correct Answer: Option B…

4 years ago

The percentage of the original nuclei of the sample of a radioactive substance left after 5 half-lives is?

A. 8% B. 5% C. 3% D. 1% Correct Answer: Option C = 3% Explanation After 5 half-lives, the fraction…

4 years ago

The energy associated with the photon of a radio transmission at 3 x 10^5 Hz is [h = 6.63 x 10^-34Js]

A. 2.00 x 10-28J B. 1.30 x 10-28J C. 2.00 x 10-29J D. 1.30 x 10-28J Correct Answer: Option A…

4 years ago

Pure silicon can be converted to a p-type by adding a controlled amount of?

A. trivalent atoms B. tetravalent atoms C. pentavalent atoms D. hexavalent atoms Correct Answer: Option A - trivalent atoms

4 years ago