Wave Optics - Rajasthan Board (RBSE) STD 12 Science Physics Questions

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.

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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Wave Optics question types

Wave Optics questions

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Wave Optics Physics - Wave Optics

Wave Optics question types

Wave Optics questions

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