Question # 1

The process of pair production will take place if the energy of photon is greater than.

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0.21 MeV

0.51 MeV

1.51 MeV

1.21 MeV

Mosley's law establishes the X-rays fluorescence of target element with is.

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Atomic weight

Atomic number

Density

Lattice constant

An ice making machine extracts energy at the rate of 500 W The specific latent heat of fusion of ice is 300 kj kg-1. How long does it take to freeze 2 kg of water at 0 oC.

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120 s

150 s

1200 s

1500 s

What is emitted by the hot metal filament in a cathode ray tube.

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Alpha particles

Electrons

Protons

X rays

A newly prepared radioactive nuclide has a decay constant Lamda of 10-6 s-1 What is the approximate half life of the nuclide.

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1 hour

1 day

1 week

1 month

A vacuum diode conducts when plate

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Is negative w.r.t cathode

Is positive w.r.t. cathode

and cathode are at the same potential

Resistance is less

The line passing symmetrically though the optical center of the lens is.

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Focal plane

Principal focus

Principal axis

Focal length

Which one of the following represents an ohm.

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Volt per ampere

Joule per second

Watt per ampere

Joule per coulomb

Lagging of magnetic flux density behind the magnetizing fled is known as.

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susceptibity

Diamagnetism

Hysteresis

Retentivity

The half life of a radioactive substance is 6 years What is the time taken by 12 g of this substance to decay completely.

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12 years

24 years

48 years

infinity

The average energy released per fission of U is about

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200 eV

2 keV

2 MeV

200 MeV

Which one of the following materials has negative temperature coefficient.

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Conductors

Semiconductors

Insulators

Covalent bonds

When a ray of light traveling in a rare medium enters into a denser medium

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It remains undeviated

It is reflected back

It bends towards the normal

It bends away from the normal

The picture to be transmitted must be scanned because in T.V transmission light wave are first changing into.

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sound wave

Electric fluctuations

Magnetic fluctuations

Signals

Which characteristics successively increases in the musical scale.

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Pitch

Quality

Loudness

Amplitude

In the direction indicated by an electric field line.

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The electric field strength must increases

The electric field strength must decreases

The potential must remain constant

The potential must decreases

A capacitor of capacitance F micro is fully charged from a 20 V d.c supply what is the energy delivered by 20 V supply.

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2 mJ

10 m j

20 mJ

25 mj

Since light rays are always diverged by concave lenses such lenses

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Cannot form images

Form only black and white images

From only invented image

Form only erect images

The same notes being played on sitar and veena differ in.

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Pitch

Quality

Both quality and pitch

Neither quality nor pitch

When a ray light is incident at anacute angle to the boundary of the media the refracted ray.

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Bends away from the normal

Bends towards the normal

Remains undedicated

Is totally reflected

A fluid is said to be ideal if it is

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Non viscous

Non viscous and incompressible

Non viscous and with steady flow

Non viscous incompressible and has steady flow

The cause of ferromagnetism is.

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Orbital motion of elections

spin Motion of electrons

Permanent dipole memento

Spin angular momentum

Two bullets a and b have masses 1 kg and 12 kg respectively.

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K.E. of B will be twice that of A

K.E. of A will be twice that of B

Both have same K.E.

K.E. of A will be half that of B

Ebers-Moll model describes the working of a

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BJT

FET

MOSFET

UJT

X-rays can cause

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Malaria

Dysentery

Cancer

Blood pressure

The continuous x rays spectrum is obtained due to

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Deceleration of impact electrons

Breaking potential

Excitation potential

Ionization potential

The wave phenomenon that classifies light as a transverse wave is.

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Polarization

Diffraction

Interference

Refraction

The force of gravity between two objects does not depend upon the.

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Constant of gravitation

Separation

Product of their masses

Sum of their masses

Light entering glass will not suffer change in

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Wavelength

Direction

Velocity

Frequency

One gray is equal to.

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1 J-1 kg -1

1 J -1 kg -2

1 J 1 -g-1

1 j kg -2

Neil Bohr made his three postulates in.

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1897

1905

1913

1921

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