Question # 1

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

The work done on the system by the environment is considered as

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positive

negative

zero

any one of them

A digital system deals with quantities which has discrete values:

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Two in number

One in number

Three in number

Four in number

None of these

The current in microamperes required to produce one millimeter deflection on a scale placed one meter away from the mirror of the galvanometer, defined the sensitivity of

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ammeter

voltmeter

galvanometer

avo-meter

Conventionally, all the distance p, q, f are measured from _____ of the lens:

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Focus

Optical center

Edges

None of these

The ultimate source of money sources of energy is:

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Sun

Air

Water

Petroleum

The Stephen-Boltzmann law for the black body radiation is given by

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E = T²

E = -T²

E = T⁴

E = -T⁴

Rocket engines lift a rocket from the earth surface, because hot gas with high velocity

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Push against the air

React against the rocket and push it up

Heat up the air which lifts the rocket

Push against the earth

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

The value of the metastable state for Neon is

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20.66eV

20.61eV

19.23eV

18.70eV

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decresase

IF the spinning speed of the earth is increased then the weight of the body at equator

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Does not change

Doubles

Decreases

Increases

The thermometer which is suitable to measure 2000°C is

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Platinum thermometer

Gas thermometer

Vapour pressure thermometer

Pyrometer

Bulk modulus for aluminium is

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40

70

75

95

In case of interference fringes:

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Energy is destroyed at dark

Energy is created at bright fringes

Energy is transferred from dark to bright ringes

None of these

A particle is moving along a circular path of radius 5 m with uniform speed 5 m/sec what will be the magnitude of centripetal acceleration when the particle completes half revolution

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10π m/sec²

5 m/sec²

10/π m/sec²

Zero

A capacitor of capacity 1 μF is charged to 1 kV.The energy stored in J

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5

0.5

0.005

50

The phase difference between two points on a wave front will be

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0°

4π

2π

π/2

The more general form of second law of motion is

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F = ma

F × t = mV_f - mV_i

Both

None of these

Characteristics of optic fibre is/are

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Much thineer

Light weight

Extremely wide bandwidth

All of these

A person walks first 10 km north and 20 km east.then the resultant vector is

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22.36 km

22.46 km

25.23 km

20.36 km

In Newton,s rings apparatus, we also use

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Spectroscope

Telescope

Microscope

Turn table

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