Question # 1

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none of them

Number of supplementary units are

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Three

Two

Seven

Five

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

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E = T²

E = -T²

E = T⁴

E = -T⁴

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

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decrease

increase

same

none of these

When the object lies between F and 2F, the image formed by is formed at:

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Real

Virtual

Diminished

Erect

Each atom in a metal crystal vibrates about a fixed point with an amplitude that:

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Decrease the rise in temprature

Is not affected by rise in temprature

Increase with rise in temprature

Both (B) and (C)

None of these

Energy is stored in the choke coil in the form of

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Heat

Magnetic energy

Electric energy

Electro-magnetic energy

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

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deuteron

deterium

protium

tritium

Rice takes longest to cook

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In a submarine 100 m below the surface of the sea

At sea level

At Murree

At Mount Everest

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

Silicon can be obtained from

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Lead

Uranium

An isotope of oxygen

Sand

The dielectric constant K of an insulator cannot be.

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3

8

6

∞

The low blood pressure is

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70 - 80 torr

75 - 80 torr

78 - 809 torr

79 - 80 torr

The number of electrons emitted depend upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

Polarization is a phenomenon in which

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Electric intensity decreases

Potential difference decreases

Charge 'Q' decreases

All of them

If a metallic bob is suspended by a string in the vertical place, it will be in?

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complete equilibrium

translational equilibrium

rotational equilibrium

none of them

A semiconductor is known to have an electron concentration of 8 x 10¹³ per cm³ and hole concentration of 5 x 10¹² per cm³ the semiconductor is

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n-type

P-type

Intrinsic

None of these

The cross product of parallel vectors is zero when angle between

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θ 0^o

θ = 90^o

θ = 180^o

a and c

The transmission of information by light waves may be

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An audio signal

A television signal

A computer data signals

All of them

The advantage/advantages of fiber optics than radio wave carriers

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Much wider band width

Capability

Immunity

All of these

Common methods used for the conversion of biomass into fuels are

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Fermentation

In direct combustion

Direct combustion

None of these

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentun

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