Question # 1

The Phenomenon of emission of radiations from radioactive elements is called:

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Doping

Allotropy

Radioactivity

Induction

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

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

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Argon

Neon

Helium

Hydrogen

The mass of Beta particle:

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0

4

2

1

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

Bagasse is used as in.

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Sugar mills

Cattle feeds

Alcohol

Cotton textile

Recording of electrical activity of brain is said to be:

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ultrasound

MRI

E.E.G

E.C.G

Which of the following is a natural fiber:

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Teflon

Cotton

Acrylic

Nylon

Which radiation have zero mass number

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Alpha radiation

Beta ratiation

Gamma radiation

None of these

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

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

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1895

1886

1896

1898

Emission of ratiations from nucleus is said to be

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Chemical reaction

Atomic reaction

Radioactivity

Nuclear fission

Frequency of ultrasound is.

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Less than 20 Hz

20 KHz

30 KHz

More than 20 khn

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

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Reflection

Refraction

Total internal reflection

Dispersion

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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