Question # 1

If we increasing angle of incidence then at a particular angle incidence the angel of refraction is.

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45 ^o

60 ^o

30 ^o

90 ^o

----------------- rays are used to detect the flaws and crocks of metal parts.

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a -rays

gama rays

beta rays

None of these

The mass of Beta particle:

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0

4

2

1

In ........ henry Bequeral discovered.

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1895

1886

1896

1898

Radioactivity occurs naturally from all the elecments with atomic number greater than.

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62

72

80

82

Bagasse is used as in.

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Sugar mills

Cattle feeds

Alcohol

Cotton textile

What discovered radioactivity?

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Einstein

Newton

J.J. Thomson

Henry Becquerel

During the preparation of the juice of sugarcane is heated from:

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100°C to 110°C

100° to 120°

100°C to 130°C

100°C to 140°C

Laser surgery is of special importance in

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heart operation

kidney operation

liver operation

cancer operation

Which radiation have zero mass number

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Alpha radiation

Beta ratiation

Gamma radiation

None of these

In engineering department besides heavy machinery the role of ....... industry is examplary.

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Cottage

Steel

Electrical

Paper

---------------- lasers are presently used for operating cataract and glaucoma.

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Argon

Neon

Helium

Hydrogen

Laser is used toproduce three -Dimensional image called.

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Holograms

Holography

Lithotropsy

Radioactive elements

Frequency of ultrasound is.

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Less than 20 Hz

20 KHz

30 KHz

More than 20 khn

Which of the following is a natural fiber:

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Teflon

Cotton

Acrylic

Nylon

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