Question # 1

James chadwick discovered:

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Proton

Positron

Neutron

Electron

An ECG records the _____ between points on human skin generated by electric process i the heart.

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Heart beat

Pulse rate

Pressure

Voltage

The unit of temperature co efficient of resistivity is.

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Ohm -m

K-1

K

Ohm

The first superconductor was discovered in:

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1831

1911

1921

1876

The unit of induced emf is

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Ampere

Volt

Joule/coulomb

Both (b) and (c)

The device which is used as amplifier and works with the negative feedback is.

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Operational amplifier

P-n-p transistor

n-p-n transistor

Transistor

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

The unit of permiability of free space is:

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T.m/A

T.m²/A

T.m/A²

None of these

S.I unit of strength of electric field is

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J/C

C/V

V/C

N/C

The term invertor is used for.

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NOR gate

XNOR gate

NAND gate

NOT gate

Which of the following is typical source of alpha particle.

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Strontium -94

Radon -222

Cobalt -60

Zic sulphate

The force which is responsible for the breaking up of the radioactive element is.

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Weak nuclear force

Strong nuclear force

Electromagnetic force

Gravitational force

Photo diode is used for detection of.

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Heat

Magnet

Current

Light

SI unit of electric flux is.

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NmC¹

Nm^-1 C¹

Nm²C^-1

Nm³C²

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

The emission of electrons from metal surface when exposed to light is called:

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Compton effect

Pair production

Photoelectric effect

None of above

The particles equal in mass but greater than proton are.

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Mesons

Baryons

Leptons

Hadrons

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

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