Question # 1

When the object lies between F and 2F, the image formed by is formed at:

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Real

Virtual

Diminished

Erect

Speed of light in vacuum depends upon:

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Frequency

Wavelength

Amplitude

None of these

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

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Double the size

Same size

Half the size

None of these

A ray passing through optical center of a lens, after refraction:

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Passes through focus

Go deviated

Retraces its path

Both B and C

To observe interference of light, the condition, which must be met with is that the sources must be:

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Monochromatic

Phase coherent

Both of above

None of above

The magnifier forms a virtual image of the object at:

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Least distance of distinct vision

Much farther than the least distance

Both A and B are correct

None of these

If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:

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5 cm

10 cm

20 cm

25 cm

Wave length of that color as compared to that of violet color is:

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Smaller

Longer

Equal

None of these

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

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Fringe width will decrease

Fringe width will increase

Fringe width will remain unchanged

Fringe will become less intense

Huygen's theory cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

Light has:

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Wave nature

Particle nature

Dual nature

None of these

In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:

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Greater than

Smaller than

Equal to

None of these

The locus of all points in a medium having same phase of vibration is called

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Crest

Trough

Wavelength

Wave-front

Stars twinkle due to

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The fact that they do not emit light continuously

The refractive index of earth's atmosphere fluctuates

The Star's atmosphere absorbs its light intermittently

None of these

The wave nature of light was proposed by:

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Newton

Thomas Young

Huygen

None of these

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ECAT Pre General Science Physics Chapter 9 Physical Optics Online Test MCQs With Answers

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