Question # 1

Low level radiations effects

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Less of hair

Ulceration

Drop of white blood cells

All

A.C. can be converted into D.C. by

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An oscillator

Detector

An amplifier

Rectifier

Galvanometer is sensitive when C/BAN is

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zero

Large

small

Negative

A charged particle enters in a strong magnetic field its K.E.

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Remain constant

Increases

Decreases

Increases then decreases

Controlling rods inserted into the reactor are of metal:

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Aluminium

Cadmium

Magnesium

Copper

Bottom quark carries charge :

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2/3 e

-2/3 e

+1/3 e

-1 /3 e

The AC system is preferred to DC system because:

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AC voltage can be easily changed in magnitude

DC motor angular velocity is affected badly

High voltage AC transmission is less efficient

Domestic appliance require AC voltage for their operation

The total charge of any nucleus is:

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Ze

Z

Both a and b

None of above

The SI unit of magnetic induction 'B' Tesla is equal to.

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NA-1m-1

Nam-1

NA-1 m

Na2m-1

In photovoltaic cell, current is directly proportional to.

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Wavelength of light

Intensity of light

Energy

Frequency of light

To get N-Type the Ge is doped with

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Aluminium

Arsenic

Boron

Indium

The Kirchhoff 1^st rule is manifestation of:

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Law of conservation of mass

Law of Conservation of charge

Law of conservation of energy

None of above

The function of three anodes a C.R.O is

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To accelerate electrons only

To focus the electrons only

To control the brightness of spot on screen

To accelerate and focus the electrons

The device which are required to convert various physical quantities into electric voltage are called.

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Filters

Rectifiers

Amplifiers

Sensors

A force of 0.01 N is exerted on a charge 1.2 x 10^-5 C at a certain point. The electric field at that point is

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1.2 x 10⁴ N/C

1.2 x 10⁴ C/N

8.3 x 10² N/C

8.3 x 10^-2 N/C

The particles which do not experience strong force are called.

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Baryons

Hadrons

Mesons

Laptons

The conventional current is due to the flow of

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Atoms and molecules

Positive charge

Negative charge

Bot (b) and (c)

The materialization of energy take place in the process of.

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Photo electric effect

Compton Effect

Pair production

Annihilationof matter

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