Question # 1

The most abundant isotope of neon is.

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Neon -20

Neon -21

Neon -22

Both a and c

Neil Bohr made his three postulates in.

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1897

1905

1913

1921

When light enters glass from air it suffers a change in.

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Wavelength

Wave front

Velocity

All of these

In a stationary wave the particle velocity at the node is

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Zero

Constant

Minimum

Maximum

When temperature increases, frequency of an organ pipe

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Decreases

Increases

Remain the same

Become zero

The maximum height reached by a projectile with a velocity of 14 m s-1 at an angle of 30 ^owith the horizontal is.

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1.5 m

2.5 m

1 m

2 m

Which of the following quantities is discrete according to Bohr's hypothesis.

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Momentum

Potential energy

Angular velocity

Angular momentum

To which law of thermodynamics, the concept of temperature is related to.

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Zeroth law

First law

Second law

Third law

For polarization , the direction of oscillation has to be perpendicular to the direction of travel sound waves are longitudinal waves so they cannot be.

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Reflected

Deflected

Diffracted

polarized

The value of principal quantum number for an ionized atom is.

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13.6 eV

27.2 eV

54.4 eV

100 eV

During the alpha decay process

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A neutron is emitted

a electron is emitted

A helium core is emitted

A proton core is emitted

in the region where the field lines are parallel and equally spaced, the field is.

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Zero

Unirorm

Non uniform

Negative

Interference fringe spacing depends on

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The wavelength of light used

The distance screen from the coherent sources

Separation between the sources

All of the above

The SI unit of density is.

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kg m2

kg m-2

kg m-3

kg m2 s-2

Who first discovered a similarity in nature of x rays and light rays.

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Roentgen

Bragg

Man Von Lave

Moseley

The consumption of energy by a 60 W bulb in 2 s is

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0.02 J

30 J

60 J

120 J

Wave length of a LASER can be sued as a standard of.

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Angle

Time

Length

Temperature

If the wave length of a wire is 1 cm and its period is 0.02 s, the velocity of the wave will be

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20 cm s-1

50 cm s-1

60 cm s-1

100 cm s-1

In microwave ovens, heating is produced by the phenomena of

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Reflection

Refraction

Damped oscillations

Resonance

The ration Cv/Cp = y for a diatomic gas like air is

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1.29

1.30

1.40

1.67

The working of cloud chamber is based in the presence of.

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Super heated vapours

Liquid

Super saturated vapors

Unsaturated vapours

The velocity at which laminar flow changes to turbulent flow is called.

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Terminal velocity

Escape velocity

Critical velocity

Uniform velocity

If an athlete uses 50 J of energy to lift a load in 2 s his muscular power is.

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125 W

250 W

500 W

1,000 W

The maximum energy of emitted photoelectron is measured by

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the largest potential difference they can traverse

The current they produce

The potential difference they produce

The speed with they emerge

Beats are the result of.

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Interference

Doppler's effect

Ultrasound

Polarization

Faraday's law deals with

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Induced emf

Motional emf

Induced current

Electric current

What is an elementary particle, the basic unit of light and all other form of electromagnetic radiation.

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Phonon

Photon

Neutron

Proton

One Tesla is equal to.

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1 N A-1

1 N m-1

1 N A -1 m

1 N A -1 m-1

Where is the velocity of electrons maximum in a diode.

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Near the cathode

Near the anode

In the space ini between the two elecrode.

It is same throughout the tube

The phenomenon of interference occurs because waves obey

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Laws of reflection

Principle of super position

Laws of motion

Inverse square law of intensities

The process is which volume of the system remains constant.

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Isobaric process

Isochoric process

Isothermal process

Adiatatic process

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