# CBES Board Class 12-CBES Board(Class 12/Physics)MCQ Questions with Answers(Chapter 10 Wave Optics) Sample Test,Sample questions

## Question: `A laser beam is used for locating distant objects because`

1.it is monochromatic

2.it is not chromatic

3.it is not observed

## Question: `An optically active compound`

1.rotates the plane of polarised light

2.changes the direction of polarised light

3.does not allow plane polarised light to pass through

4.Â none of these

1.Newton

2.Huygens

3.Maxwell

4.Fresnel

1.wave nature

2.wavelengths

3.velocity

4.frequency

## Question: `The phenomena which is not explained by Huygenâ€™s construction of wavefront`

1.reflection

2.diffraction

3.Â refraction

4.origin of spectra

1.2000 Ã…

2.Â 4000 Ã…

3.1000 Ã…

4.3000 Ã…

1.45Â°

2.50Â°

3.53.74Â°

4.63

## Question: `To observe diffraction, the size of the obstacle`

1.should beX/2, where X is the wavelength.

2.should be of the order of wavelength.

3.has no relation to wavelength.

4.should be much larger than the wavelength.

1.1/0/1900 3:01

2.1/0/1900 3:02

3.1/0/1900 9:01

4.1/0/1900 6:01

## Question: `When interference of light takes place`

1.energy is created in the region of maximum intensity

2.energy is destroyed in the region of maximum intensity

3.Conservation of energy holds good and energy is distrubuted

4.Conservation of energy does not hold good

## Question: `Which of the following is correct for light diverging from a point source?`

1.The intensity decreases in proportion with the distance squared.

2.Â The wavefront is parabolic.

3.The intensity at the wavelength does not depend on the distance.

4.None of these.

## More MCQS

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