Question # 1

Which device converts alternating current to direct current.

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Motor

Generator

Transformer

Rectifier

House hold circuits are mostly

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Wired in sires

Wired in parallel

Made using wires of gold

Made using wires of silver

A sheet of transparent material with fine equality spaced lines ruled parallel on its surface is called.

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Interferometer

Grating element

ruler

Patch

The advantage of electron tube over semiconductor is.

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_{its efficiency}

its unlimited type

Its low consumption power

That it takes no warming up time

According to Max. Planck, energy is released or absorbed in discrete packets called.

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quanta

Meson

Energy shells

Position

If the earth stopped rotating the weight of the object at the equator would.

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Be greater

Be same as before

Be less

Very with altitude

A bomb dropped from an aeroplane explodes in air, its total.

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Momentum decreases

Momentum increases

K.E. Increases

K.E. Decreases

Which technique uses underwater sound propagation to detect and locate submerged objects.

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RADAR

LIDAR

SONAR

LASER

The decimal equivalent of 1111 is

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5

10

15

120

During transition, atom cannot emit

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Visible light

Ultraviolet radiation

Infrared radiations

gama rays

who discovered taht mass and energy are forms of each other.

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Issac Newton

Albert Einstein

Galileo

Khawarizmi

The half life of a radioactive element depends upon.

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Temperature

pressure

nature of element

quantity of the element

In the case of forced oscillations frequency of oscillation is.

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The natural damped frequency

The natural undamped frequency

The frequency of the external periodic force

Some other frequency

The radius of second orbit of hydrogen atom is

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0.071 A

0.142 A

4.752 A

9.5298 A

In the equation P = IV cos Theta Cos theta is known as

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Phase angle

Liming angle

Phase

Power factor

Which of the following is standard scale of temperature

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Mercury scale

Platinum resistance scale

Gas scale

Alcohol scale

Two pure inductors each of self inductance L are connected in parallel The total inductance of the combination is.

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L

2L

L/2

L/4

A water wave is an example of

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Electromagnetic wave

Longitudinal wave

Transverse wave

Reverberation

In a cloud chamber the Alpha particles leave

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Dense, straight and continuous tracks

Only straight and continuous tracks

Thin and discontinuous tracks

Irregular tracks

The phenomenon of Brownian motion shows that

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Molecules exist and can be seen as bright dots moving about

Molecules moves about randomly at highs speeds

Smoke particles behaves as molecules

Smoke particles can be used as models of air molecues.

The power dissipation in a pure inductive or capacitive circuit is.

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Maximum

Minimum

Zero

Infinity

the ratio of applied stress to volumetric strain is called.

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shear modulus

Bulk modulus

Young's modulus

elastic limit

Which of the following pair does not have identical dimensions.

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Energy and torque

Momentum and impulse

Mass and moment of inertia

Energy and work

Which type of oscillations produce resoncance.

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Free

Forced

Damped

All of these

Balmer identified the spectral lines in the spectrum of hydrogen in

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1785

1885

1936

1966

Prince Louis and vector de Brogtle got Nobel Prize for their work on.

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The dual nature of particles

The wave nature of particles

the corpuscular nature of particles

All of the above

The SI unit of heat capacity is.

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kg J

Kg J-1

J K-1

Kg J-1 K-1

In a spectrometer experiment monochromatic light is incident normally on a diffraction gratin having 4.5 x 10⁵ lines per metre The second order line is seen at an angle of 30^o to The normal What is the wavelength of the light.

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430 nm

556 nm

589 nm

625 nm

The doped semi conductor materials are called

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Pure semi conductors

Poor semi conductors

Super conductors

Extrinsic semiconductors

Which of the following quantities is zero about the centre of mass of body.

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Mass

acceleration

Moment

Angular acceleration

x-rays can cause fluorescence in materials such as

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Cadmium

Zinc sulphide

Palatinocyanide

All of these

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