A parallel plate capacitor has a capacitance of 5 . It becomes�

Subject

Physics

Class

ICSE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Choose the correct alternative: 

Intensity of electric field at a point at a perpendicular distance 'r' from an infinite line charge, having linear charge density straight lambda is given by, 

  • straight E space equals space open parentheses fraction numerator 1 over denominator 4 πε subscript straight o end fraction close parentheses straight lambda over straight r
  • E = open parentheses fraction numerator 1 over denominator 4 πε subscript straight o end fraction close parentheses fraction numerator 2 lambda over denominator r end fraction

  • E = open parentheses fraction numerator 1 over denominator 4 πε subscript straight o end fraction close parentheses lambda over r squared

  • E = open parentheses fraction numerator 1 over denominator 4 πε subscript straight o end fraction close parentheses lambda over r squared

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2.

If R1 and R2 are filament resistance of a 200 W and a 100 W bulb respectively, designed to operate on the same voltage. 

  • R1 = R2

  • R2 = 2R1

  • R2 = 4R1

  • R2 = 4R1

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3.

A metallic wire having length of 2 m and weight of 4 x 10-3 N is found to remain at rest in a uniform and transverse magnetic field of 2 x 10-4 T. Current flowing through the wire is: 

  • 10 A

  • 5 A

  • 2 A

  • 2 A

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4.

When a beam of white light is passed through sodium vapours and then through a spectrometer, spectrum so obtained has two dark lines present in the yellow region. this spectrum is called: 

  • band spectrum

  • continuous spectrum

  • absorption spectrum of sodium

  • absorption spectrum of sodium

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5.

If I3 and I2 represent angular momenta of an orbiting electron in III and II Bohr orbits respectively, then I3 : I2 is,

  • 3:2

  • 9:4

  • 2:3

  • 2:3

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 Multiple Choice QuestionsShort Answer Type

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6.

A parallel plate capacitor has a capacitance of 5 μF. It becomes 50 μF when a dielectric medium occupies the entire space between its two plates. What is the dielectric constant of the medium? 


Initial capacitance, C =  5 

Capacitance when dielectric is insrted = 50 

Using the formula,

K = C/Co = 50 / 5 = 10

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7.

Find the EMF of the battery as shown in the figure below: 


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8.

Two substances A and B have their relative permeabilities slightly greater and slightly less than 1 respectively.

What do you conclude about A and B as far as their magnetic materials are concerned ?

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9.

When does a moved charged particle not experience force while moving through a uniform magnetic field.

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10.

What is the turns ratio i.e., transformer ratio, ns : np in an ideal transformer which increases AC voltage from 220 V to 33000 V?

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