What are the dark lines seen in the solar spectrum called? from

Subject

Physics

Class

ICSE Class 12

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Sample Papers

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 Multiple Choice QuestionsFill In the Blanks

1.

Fill in the blank in the given nuclear reaction. 

____ + 

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 Multiple Choice QuestionsOne Word Answers

2. State the SI unit of magnetic dipole moment.
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3. Alternating current flowing through a certain electrical device leads over the potential difference across it by 90° State whether this device is a resistor, capacitor or an inductor.
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4. What is the shape of the wavefront diverging from a point source of light?
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5. The critical angle for a given transparent medium and air is ic. A ray of light travelling in air is incident on this transparent medium at an angle of incidence equal to the polarising angle ip What is the relation between the two angles ic and ip?
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6. What are the dark lines seen in the solar spectrum called?


Fraunhoffer lines.
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7. Given an example where energy is converted into matter
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8. To convert a pure semiconductor into n-type semiconductor, what type of impurity is added to it?
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 Multiple Choice QuestionsMultiple Choice Questions

9.

Choose the correct alternative (a), (b), (c) or (d):

  • 0= 9∈w 

  • 0=81∈w

  • w=9∈

  • w=81∈

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10.

Five resistors are connected as shown in Figure 



The effective resistance i.e. equivalent resistance between the points A and B is:

  • 4Ω 

  • 20Ω   

  • 20Ω 

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