Punjab 12th Class Physics Chapter 8 Dawn of Modern Physics Mcqs Test Online
Questions 9
Total Marks 18
Time 9 Mins
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Punjab 12th Class Physics Chapter 8 Dawn of Modern Physics Mcqs Test Online

Punjab 12th Class Physics Chapter 8 Dawn of Modern Physics Mcqs Test Online

 

Question 1 of 9

Physics

1. Pair production cannot take place in vacuum because:
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Question 1 of 9

Question 2 of 9

2. Pair production occurs only when energy of photon is at least equal to:
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Question 2 of 9

Question 3 of 9

3. The positron has charge which is in magnitude equal to the charge on:
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Question 3 of 9

Question 4 of 9

4. If the K.E of free electron double, its de Broglie wavelength changes by the factor.
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Question 4 of 9

Question 5 of 9

5. De-Broglie waves are associated with:
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Question 5 of 9

Question 6 of 9

6. We can never accurately describe all aspects of subatomic particles simultaneously. It is correct according to:
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3.
4.

Question 6 of 9

Question 7 of 9

7. A perfect absorber must be also be perfect:
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Question 7 of 9

Question 8 of 9

8. An electron microscope employs which to one of the following principles?
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Question 9 of 9

9. Einstein’s photoelectric equation is Ek = hf = φ in this equation Ek refers to:

 
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3.
4.

Question 9 of 9


 

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