Question # 1

The first orbit in the hydrogen atom has a radius.

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0.53 nm

0.053 nm

0.0053 nm

0.00053 nm

The jerks in D.C. motor are created by the use of.

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Armature

Commutators

Split rings

Source of emf

In order to increase sensitivity of galvanometer the value of C may be

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Increase

Decrease

Neither increase nor decrease

Remain same

Power dissipation in A.C circuit is expressed as:

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P =I_rms x V_rms Sinθ

IxVCosθ

I_rmsxV_rmsCosθ

I_rms x V_rms Sin2θ

Einstein was awarded Nobel prize in physics in

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1905

1911

1918

1921

Domains are existed in

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Ferromagnetic materials

Paramagnetic materials

Semi conductors

Diamagnetic materials

Closeness of the electric field lines is the measure of.

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Direction of field

Strength of field

Potential difference

Uniformity of field

Which of the following is similar to electron.

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Beta particle

Alpha particle

Neutron

Proton

Pair production can take place only when energy of radiation is equal and greater than 1.02 MeV, thus correct option is.

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X rays

Gama rays

Heat Radiation

Ultraviolet rays

The most useful tracer is.

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Strontium -90

Iodine -31

Cobalt -60

Carbon -14

An electron in H -atom is excited from ground state n=4 , How many spectral lines are possible in this case.

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6

5

4

3

The energy of the photon of wavelength 500 nm is.

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3.10 eV

2.49 eV

1.77 eV

1.52 eV

A dot represents the direction of magnetic field.

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Out of page

Into the page

Tangent to page

Parallels to page

At 0 K a piece of silicon is a

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Conductor

Semi-conductor

Insulator

All

De-Broglie waves are associated with

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Moving charged particles only

Moving neutral particles only

All moving particles

All parties whether in motion or at rest

Albert Einstein got noble prize for service in:

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Pair production

Annihilation of matter theory

Compton effect

Photoelectric effect

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

X=A+B is the mathematical notation for.

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OR gate

NOR gate

NAND gate

AND gate

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