A resistor R is connected to a cell of emf e and internal resist

Subject

Physics

Class

ICSE Class 12

Pre Boards

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Sample Papers

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 Multiple Choice QuestionsMultiple Choice Questions

1.

A short electric dipole (consists of two point charges +q and -q) is placed at the centre O and inside a large cube (ABCDEFGH) of length L, as shown in the figure below. The electric flux, remaining through the cube is:

  • fraction numerator straight q over denominator 4 πε subscript straight o straight L end fraction
  • Zero

  • fraction numerator straight q over denominator 2 πε subscript straight o straight L end fraction
  • fraction numerator straight q over denominator 2 πε subscript straight o straight L end fraction
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2.

The equivalent resistance between points a and f of the network as shown in the figure below is:

  • 24 ohm

  • 110 ohm

  • 140 ohm

  • 140 ohm

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3.

A moving electron enters a uniform and perpendicular magnetic field. Inside the magnetic field, the electrons travels along,

  • a straight line

  • a parabola

  • a circle

  • a circle

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4.

A fish which is at a depth of 12 cm in water (straight mu space equals space 4 over 3) is viewed by an observer on the bank of a lake. It's apparent depth as observed by the observer is:

  • 3 cm

  • 9 cm

  • 12 cm

  • 12 cm

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5.

If EP and EK represent potential energy and kinetic energy respectively, of an orbital electron, then according to the Bohr's theory:

  • Ek = -EP/2

  • Ek = -EP

  • Ek = -2EP

  • Ek = -2EP

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 Multiple Choice QuestionsShort Answer Type

6.

What is meant by the term Quantization of Charge?

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7.

A resistor R is connected to a cell of emf e and internal resistance r. Potential difference across the resistor R is found to be V. State the relation between e, V, R and r.


Resistance = R
EMF = e
Internal resistance=r
Potential difference across the resistor R = V

Relation between e,V,Rand r is given by,

straight V space equals space fraction numerator eR over denominator straight r plus straight R end fraction
rightwards double arrow space straight V space equals space straight e space minus space straight V over straight R straight r
rightwards double arrow space straight V space equals space straight e minus fraction numerator straight e over denominator straight R plus straight r end fraction. straight r

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8.

Three identical cells of emf 2V internal resistance 1 ohm are connected in series to form a battery. The battery is then connected to a parallel combination of two identical resistors, each of resistance 6 ohm. Find the current delivered by the battery.

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9.

State how magnetic susceptibility is different for the three types of magnetic material, i.e., diamagnetic, paramagnetic and ferromagnetic materials. 

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10.

An emf of 2 V is induced in a coil when current in it is changed from 0A to 10 A in 0.40 sec. Find the coefficient of self-inductance of the coil.

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