Question # 1

Frequency of ultrasound is.

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Less than 20 Hz

20 KHz

30 KHz

More than 20 khn

----------------- 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

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

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62

72

80

82

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

What discovered radioactivity?

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Einstein

Newton

J.J. Thomson

Henry Becquerel

Phosphorous.... and sulphur 35 are employed on living system to trace metabolic path.

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31

30

38

32

The principal of light on whihc the fibre optics works is.

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Reflection

Refraction

Total internal reflection

Dispersion

Element having atomic numebr greater than.......... go on emitting radiations.

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80

92

82

83

the test that measures the electrical activity of the heart:

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E.C.G (Electrocardiogram)

E.E.G (Electroencephalography)

M.R.I (Magnetic resonance imaging)

Angiography

The rays which are liberated from metal due to collision of fast moving electrons:

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Alpha rays

Beta rays

Gamma rays

x - rays

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

The light of laser is:

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monochromatic

dichromatic

trichromatic

Tetrachrmatic

When a ray of light passes from a denser to a rare medium it;

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bends away form the normal to the interface

bends towards the normal

does no bend

non of the above

The number of hydrogen isotopes;

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3

2

8

10

Which type of rays are used in the solar system fitted on ships and submarines to find the hidden secrets under water:

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x - rays

C.T Scan

Ultrasound

Light

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