Download App

Current Electricity — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsCurrent Electricity1 Mark
Question
Constantan wire is used for making standard resistance, because it has:
✓

Answer

  1. Negligible temperature coefficient of resistance.
Explanation:
Constantan is a copper-nickel alloy. Its main feature is its resistivity, which is constant over a wide range of temperatures. Thus it has low temperature coefficient of resistance.that's why it is used for making of standard resistances.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Current Electricity→Current Electricity — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

The relation between geometrical length $(L_{g})$ of a magnet and its magnetic length $(L_{m})$ is :
→
Assertion  :   On going away from a point charge or a small electric dipole, electric field decreases at the same rate in both the cases.
Reason      : Electric field is inversely proportional to square of distance from the charge or an electric dipole.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.
 
 
 
 
→
Which of the following statements is not correct?
→
The magnetic moment of a steel rod of length 'l' is M. It is bent into a semi-circle. The new magnetic moment is :
→
A diver at a depth of $12m$ in water $(\mu = \frac{4}{3})$ sees the sky in a cone of semi$-$vertical angle
→
Characteristic of electromagnetic wave is shown by:
→
In a normal operation of a transistor:
  1. The base-emitter junction is forward-biased.
  2. The base-collector junction is forward-biased.
  3. The base-emitter junction is reverse-biased.
  4. The base-collector junction is reverse-biased.
→
The range of wavelength of the visible light is(a) 10 Å to 100 Å(b) 4,000 Å to 8,000 Å(c) 8,000 Å to 10,000 Å(d) 10,000 Å to 15,000 Å
       
→
On oscillating any metallic sphere in the magnetic field, its oscillatory motion is :
→
A particle has a velocity $u$ towards east at $t = 0.$ Its acceleration is towards west and is constant. Let $x_A$ and $x_B$ be the magnitude of displacements in the first $10$ seconds and the next $10$ seconds:
→