Question # 1

The middle region of electric field is:

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Maximum field spot

Zero field spot

Perpendicular field spot

All of above

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

The velocity of an oscillating charge as it moves to and fro along a wire is.

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Changing

Constant

Infinite

zero

LDR becomes necessary when op amp is used as a

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Night switch

Inverter

Comparator

Rectifier

During electrolysis process, density of CuSO₄ solution

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Remains constant

Decreased

Increased

None of these

The process by which lesser beam can be used to generate 3-dimensional images of objects is called

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Holography

Geo graphy

Tomography

Radio graphy

The radius of 10th orbit in hydrogen atom is.

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0.053 nm

0.53 nm

5.3 nm

53 nm

Gauss's law can only be applied to.

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A curved surface

A flat surface

A closed surface

A surface of any shape

Iodine -131 is used for the treatment by

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Bones

Eyes

thyroid glands

Lungs

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Semiconductor diodes are called:

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Ohmic

non ohmic

Both a & b

none of above

When charge particle enter perpendicular to magnetic field, the path followed by it is:

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A helix

A circle

Straight line

Ellipes

The series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

Brightness of screen of CRO controlled by

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Grid

Filament

Anode

Cathode

The particles which do not experience strong force are called.

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Baryons

Hadrons

Mesons

Laptons

Controlling rods inserted into the reactor are of metal:

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Aluminium

Cadmium

Magnesium

Copper

The electric field in some region of of space is uniform in magnitude and direction. Which one of the following five statements best desccribes the volume charge density (ρ) , in this region of space?

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ρ = 0

ρ decreases linearly in the direction of the electric field

ρ increases linearly in the direction of the electric field

ρ has a uniform value throughout the region

Lenz's law is a consequence of the law of conservation of

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Charge

Momentum

Energy

Angular momentum

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