MCQ
If the capacitors having capacitance C1 and C2 are connected in parallel then their effective capacitance is given by:
  • A
    C = C1 - C2
  • B
    C = C1 + C2
  • C
    1/C = 1/C1 + 1/C2
  • D
    1/C = 1/C1 - 1/C2

Answer

  1. C = C1 + C2

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

Similar questions

The time period of oscillation of a magnet in a vibration magnetometer is 1.5 sec. The time period of oscillation of another magnet similar in size, shape and mass but having 1/4 magnetic moment than that of the 1st magnet oscillating at the same place will be:

AB is a potentiometer wire of length 100 cm and its resistance is 10 ohms.  It is connected in series with a resistance R = 40 ohms and a battery of e.m.f. 2 V and negligible internal resistance.  If a source of unknown e.m.f. E is balanced by 40 cm length of the potentiometer wire, the value of E is

(a) 0.8 V 

(b) 1.6 V

(c) 0.08 V 

(d) 0.16 V

Threshold frequency is the frequency :

The electric bulbs have tungsten filaments of same length. If one of them gives 60 watt and other 100 watt, then

(a) 100 watt bulb has thicker filament

(b) 60 watt bulb has thicker filament

(c) Both filaments are of same thickness

(d) It is possible to get different wattage unless the lengths are different

An ammeter of 100 W resistance gives full deflection for the current of 10–5 amp.  Now the shunt resistance required to convert it into ammeter of 1 amp. range, will be

(a)  W

(b)  W

(c)  W

(d)  W

The reactance of a circuit is zero. It is possible that the circuit contains:

A spherical surface of radius of curvature R separates air (refractive index 1.0) from glass (refractive index 1.5). The centre of curvature is in the glass. A point object P placed in air is found to have a real image Q in the glass. The line PQ cuts the surface at a point O, and PO = OQ. The distance PO is equal to

(a) 5 R

(b) 3 R

(c) 2 R

(d) 1.5 R

An object placed 10 cm in front of a lens has an image 20 cm behind the lens. What is the power of the lens (in dioptres)

(a) 1.5

(b) 3.0

(c) – 15.0

(d) + 15.0

An organ pipe, open at both ends, contains
  1. Longitudinal stationary waves.
  2. Longitudinal travelling waves.
  3. Transverse stationary waves.
  4. Transverse travelling waves.

Two cells when connected in series are balanced on 8m on a potentiometer. If the cells are connected with polarities of one of the cell is reversed, they balance on 2m. The ratio of e.m.f.'s of the two cells is

(a) 3 : 5

(b) 5 : 3

(c) 3 : 4

(d) 4 : 3