Question # 1

Two down and one up quarks make

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Proton

Neutron

~~photon~~

Positron

In photovoltaic cell, current is directly proportional to.

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Wavelength of light

Intensity of light

Energy

Frequency of light

The background radiation to which we are exposed, on the average is.

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1 mSv per year

2 mSv per year

3 mSv per year

4 mSv per year

The potential difference across depletion region in case of Si is

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0.6 volt

0.9 volt

0.7 volt

0.2 volt

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

The illustration of the phenomenon of mutual induction is in the device of

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Transformer

Inductor

A.C. Generator

Ammeter

Cobalt -60 is the source for

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Alpha rays

Gama rays

Beta rays

Neutron

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

The ratio of potential barriers of Ge to Si at room temperatrue is.

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7:3

1:3

2:5

3:7

Sensitivity of a galvanometer can be increased by

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Decreasing the value of torsional couple

Decreasing number of turns

Decreasing area of plane of coil

Decreasing magnetic field

Bremsstrahlung radiation are examples of

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Atomic spectra

Molecular spectra

Continuous spectra

Discrete spectra

Electron volt is unit of:

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Chemical energy

Potential energy

Nuclear energy

heat energy

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

SI unit of electric flux is.

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NmC¹

Nm^-1 C¹

Nm²C^-1

Nm³C²

Electric potencial of earth is taken to be zero because the earth is good:

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Semiconductor

Conductor

Insulator

Dielectric

A pair of quark and anti quark makes a.

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Meason

harden

Lapton

Baryon

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