Question # 1

When the object is placed beyond 2F of a convex lens, the image formed will be:

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Real, inverted and smaller than the object

Real, inverted and of the same size as the object

Real, inverted and larger in size than the object

Virtual, erect and larger in size than the object

Which form of energy is sound:

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Electrical

mechanical

Thermal

Chemical

The distance between two consecutive waves compressions or rarefactions is called:

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Focal length

Wave length

Frequency

Time period

Optical fibers work on the principle of:

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Refraction

Reflection

Total internal reflection

Diffraction

The totally reflectiing prism one angle is of:

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45^o

90^o

180^o

120^o

Speed of light in air is ms^-1

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3 x 10⁸

3 x 10¹¹

3 x 10⁵

340

From which of the following we can get information almost about everything:

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Book

Teacher

Computer

Internet

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90^o is called:

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angle of incidence

critical angle

angle of refrection

None of these

Sun light consist of ____________ colour

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6

7

5

2

The line which passes through pole of the mirror and center of curvature is called principal:

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axis

Focus

Line

None of these

A data storage device is:

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Printer

Hard disk

Monitor

CPU

Snell's law is stated as:

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Sin i / sin r = n1/n2

sin i / sin r = n2/n1

sin r / sin i = n2/n1

sin r / sin i = 2n2/n1

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Physics 10th Class English Medium Unit 3 Online Test MCQs With Answers

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