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Wave Optics Physics - Wave Optics

Uttarakhand Board (UBSE) - STD 12 Science - Physics (Uttarakhand - English Medium). 397 questions in this chapter.

Question types

Wave Optics question types

397 questions across 1 question group — pick any mix to generate a Physics paper with step-by-step answer keys.

397
Questions
1
Question groups
5
Question types
Sample Questions

Wave Optics questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
Assertion : Radio waves can be polarised.
Reason : Sound waves in air are longitudinal in nature.
  • A
     If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • ✓
     If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • C
     If assertion is true but reason is false.
  • D
     If the assertion and reason both are false.

Answer: B.

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Q 2M.C.Q (1 Marks)1 Mark
Assertion : Ultraviolet radiation are of higher frequency waves are dangerous to human being.
Reason : Ultraviolet radiation are absorbed by the atmosphere
  • A
     If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • ✓
     If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • C
     If assertion is true but reason is false.
  • D
     If the assertion and reason both are false.

Answer: B.

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Q 3M.C.Q (1 Marks)1 Mark
A laser beam can be focussed on an area equal to the square of its wavelength A He-Ne laser radiates energy at the rate of 1mW and its wavelength is 632.8 nm. The intensity of focussed beam will be
  • A
     $1.5 \times 10^{13} W / m ^2$
  • ✓
    $2.5 \times 10^9 W / m ^2$
  • C
     $3.5 \times 10^{17} W / m ^2$
  • D
     None of these

Answer: B.

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Q 4M.C.Q (1 Marks)1 Mark
Assertion : For cooking in a microwave oven, food is always kept in metal containers.
Reason : The energy of microwave is easily transferred to the food in metal container.
  • A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • B
     If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • C
     If assertion is true but reason is false.
  • ✓
    If the assertion and reason both are false.

Answer: D.

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Q 5M.C.Q (1 Marks)1 Mark
Assertion : The electrical conductivity of earth’s atmosphere decrease with altitude.
Reason : The high energy particles (i.e. g-rays and cosmic rays) coming from outer space and entering our earth’s atmosphere causes ionisation of the atoms of the gases present there and the pressure of gases decreases with increase in altitude.
  • A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • B
     If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • C
     If assertion is true but reason is false.
  • ✓
     If assertion is false but reason is true.

Answer: D.

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