When platinum is heated at 1300°C, then its color turns
Correct answer: A. cherry colour
- A. cherry colour
- B. yellow colour
- C. red colour
- D. dull red colour
Explanation
When platinum is heated at around 1300°C, it emits a bright red light, which appears as a cherry color. This phenomenon is due to incandescence, where a material emits light due to its high temperature.Incorrect Options and Explanations: (b) yellow colour - At 1300°C, platinum emits a cherry-red color, not yellow. (c) red colour - The color emitted by platinum at 1300°C is closer to a cherry-red color rather than a standard red color. (d) dull red colour - The color emitted by platinum at high temperatures like 1300°C is not dull but rather bright and intense.
Last updated
About Electronics
A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
Practise Electronics
660 free Electronics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
(7) In n-p-n transistor, p works as: (Tag: Electronics sub-tag: Transistors )
A capacitor and an inductor are connected to the A.C. supply. If we double the frequency of the A.C. supply then the effect on the reactance of capacitor XC and reactance of inductor XL will be:
A capacitor is to be used to provide smoothing for a half wave rectifier. In which of the following diagrams is capacitor correctly connected?
A changing electric flux develops in the region:
A circuit that adds positive or negative voltage to an input sine wave is called _.