Question # 1

Pair production cannto take place in vacuum because :

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Mass in not conserved

Momentum is not conserved

Energy is not conserved

Charge is not conserved

The magnetic field inside solenoid is given:

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μ_∘nI²

μ_∘nI

μ_∘n/1²

μ_∘I/n

The most refined form of matter is:

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Smoke

Light

Ice

Fog

Special organs called ampullae of lorenzenite are present in.

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Bats

Cats

Dogs

Sharks

Concept of the electric field lines is introduced by

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Coulomb

Faraday

Einstein

Joseph henry

Which of the following series of hydrogen spectrum lies in ultra violet region.

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Lyman sereis

Paschen series

Balmar series

Bracket series

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

One ohm is equal to

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VC-1

CV-1

AC-1

VA^-1

Which one of the following physical quantities change with relativistic speed?

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Length

Time

Mass

All of above

The particles which do not experience strong force are called.

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Baryons

Hadrons

Mesons

Laptons

In Compton scatting, the value of shift is equal to Compton's wavelength, when X-rays is scattered at the angle of.

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90^oC

Zero

120^oC

45^oC

An AVO meter can also be called as.

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Digital multimeter

Digital voltmeter

Digital ammeter

Digital ohm meter

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

Which type of impurity is to be added to a pure semi conductor crystal to provide holes.

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Monovalent

Trivalent

Tetravalent

Pentavalent

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

Kirchhoff's first rule is the manifestation of the law of conservation of.

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Mass

Charge

Energy

Momentum

When transistor are used in digital circuits they usually operate in the :

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Active region

Break down region

Saturation & cutoff regions

Linear region

The current through a resistance of 100 Ohm when connecting across a source of 220 V is.

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22000 A

22 A

2.2 A

0.45 A

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