MCQ
In electrolytic capacitors positive terminal is
- Aone on which aluminium oxide film is not formed
- Bone on which aluminium oxide film is formed
- Cnone of the these
- Deither of the two terminals
✓
Answer
(b) one on which aluminium oxide film is formed
Explanation: Aluminium electrolytic capacitors have the Aluminium foil anode (positive terminal) which is etched and covered with a layer of Aluminium Oxide which acts as a dielectric. The whole assembly is covered using a paper separator soaked in electrolyte such as, Borax or Glycol and covered by Aluminium foil which acts as cathode (negative electrode)
Explanation: Aluminium electrolytic capacitors have the Aluminium foil anode (positive terminal) which is etched and covered with a layer of Aluminium Oxide which acts as a dielectric. The whole assembly is covered using a paper separator soaked in electrolyte such as, Borax or Glycol and covered by Aluminium foil which acts as cathode (negative electrode)
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Points A and B are situated along the extended axis of 2 cm long bar magnet at a distance x and 2x cm respectively. From the pole nearer to the points, the ratio of the magnetic field at A and B will be
|
(a) 4 : 1 exactly |
(b) 4 : 1 approx. |
(c) 8 : 1 exactly |
(d) 8 : 1 approx. |
Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted because:
The work done to move a charge along an equipotential from A to B:
The composition of an a -particle can be expressed as
|
(a) 1 P + 1 N |
(b) 1 P + 2 N |
(c) 2 P + 1 N |
(d) 2 P + 2 N |
The most penetrating radiation out of the following is
| (a) X-rays | (b) β -rays |
(c) α - particles |
(d) γ - rays |
In a Ag voltameter 2.68 gm of silver is deposited in 10 min. The heat developed in 20Ω resistor during the same period will be
|
(a) 192 kJ |
(b) 192 J |
(c) 200 J |
(d) 132 kJ |
A battery of e.m.f. 3 volt and internal resistance 1.0 ohm is connected in series with copper voltameter. The current flowing in the circuit is 1.5 amperes. The resistance of voltameter will be
|
(a) Zero |
(b) 1.0 ohm |
(c) 1.5 ohm |
(d) 2.0 ohm |
The polarisation of electromagnetic wave is in:
In Young's double slit experiment, the wavelength is $6000 Å$, the screen is at a distance of 40 cm from the slits and the distance between the fringes is $0.012 cm $, then the separation between the slits will be :
→A metal sheet is placed in front of a strong magnetic pole. A force needed to:
- Hold the sheet there if the metal is magnetic.
- Hold the sheed there if the metal is nonmagnetic.
- Move the sheet away from the pole with uniform velocity if the metal is magnetic.
- Move the sheet away from the pole with uniform velocity if the metal is nonmagnetic. Negative any effect if oaramagnetism, diamagnetism and gravity.