Question # 1

When two waves travelling through the same medium arrive at the same point 180 ^o out of phase, they give rise to.

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Polarization

Destructive interference

Refraction

Constructive interference

Young's double slit experiment was performed in

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1801

1916

1901

1934

The penetrating power of X rays is least with materials of.

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High mass density

High volume density

High electron density

High weight

In the Geiger Marsden experiment a narrow beam of alpha particles was fired at a thin piece of Gold foil in a vacuum Some of the particles were scattered though large angles The result of the experiment provided evidence for the existence of.

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A very small charged nucleus

electrons orbiting the nucleus

Neutrons in the nucleus

Nuclear reaction

In the experiment of production od x rays electrons are accelerated towards the anode by

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Thermionic emission

Potential difference

Breaking potential

Cut of currrent

Which of the following properties of sound is affected by change in air temperature.

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Amplitude

Intensity

Frequency

Wavelength

The minimum velocity needed to put a satellite into the orbit

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Terminal velocity

Escape velocity

Critical velocity

Linear velocity

The permeability of air is

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0.5

zero

infinity

Unity

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 SI unit of stress is

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kg m s-2

kg m-1 s-2

N m-2

N m-1

Solar cells are thin wafers made from

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Uranium

Nickel

Silicon

Cadmium

An object gain excess negative charge after being rubbed against another object which is.

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Neutral

Negatively charged

Positively charged

either a, b, or c

The sum of positive and negative peak values are usually written as.

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rms value

p-p value

Peak value

Instantaneous value

The escape velocity

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Increases with the increase of the mass of the body

Depends on the type of body used

Is independent of mass of the body

Decreases with the increases of the mass of the body

Stationary waves are produced when two identical waves are moving on the string.

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Along the same direction

Along the opposite direction

Along the perpendicular direction

Of length 1 m

What is the emission of light by a substance that has observed light or others electromagnetic radiations of a difference wavelength.

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Fluorescence

Illuminance

Luminance

Incandescence

If the pressure of a gas is doubled, then its thermal conductivity will

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Increases

Decreases

Remain constant

Be zero

A single silicon photovoltaic cell produces a current of the order of.

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A few miliamperes

10² A

10³ A

10⁴ A

When did max planck suggest that energy is released or absorbed in discrete packets.

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1899

1900

1905

1911

What will be excitation energy in the third orbit of hydrogen atom.

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0.66 eV

0.85 eV

1.5 eV

5.4 eV

The value of open loop gain for the amplifier is

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zero

very low

very high

of an intermediate vaue

The minimum angle of incidence for which total internal reflection can occur is called.

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Right angle

Acute angle

Critical angle

Obtuse angle

Polarization of light shows that light is.

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Corpuscular in nature

Of extremely short waves

Longitudinal waves

Transverse waves

Who was awarded Nobel Prize for fist artificial atomic transmutation.

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Yukawa

Rutherford

Chadwick

Becquerel

When an obliquely falling ray of light enters from one medium ot another it changes its path this phenomenon is called.

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Reflection

Refraction

Diffusion

Diffraction

When did an international committee agree on a set of definition of units.

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1912

1956

1960

1986

The energy supplied in charging a capacitor resides after the charging in.

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The magnetic field

The electric field

the battery

The moving conduction charges

Conductance is the reciprocal of.

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Capacitance

Inductance

Resistance

Admittance

The scientific theory concerning the coming into existence of universe.

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Cosmology

Cosmogony

Cosmography

Cosmos

A radiation spectrum which is continuously distributed over a frequency region without being broken up into lines or bands is known as.

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Continuous spectrum

Band spectrum

discrete spectra

Absorption spectrum

The centre of the sun produces a large amount of energy what is the source of this energy.

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Chemical reaction

Nuclear fission

Nuclear fusion

Radioactive decay

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