Question # 1

The phenomenon in which a charging current in one coil induces an emf in another coil is called.

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Induced current

Induced emf

Self induction

Mutual induction

Which of the following has the highest relative biological effectiveness or the quality factor.

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X rays and Gama rays

Electrons

Photons

Alpha particles

Highly conducting state of matter is

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Conductors

Plasma

Semiconductors

Insulators

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

An increase in frequency above threshold frequency results in.

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Increase in photo electric current

Increase in K.E. of electrons

Decrease in photoelectric current

Decreases in K.E. of electrons

The bunding energy per nucleon for iron is.

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zero

Maximum

Negative

Minimum

A thin layer of oil the surface of water looks coloured due to.

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Pillarization of light

Different elements present in the oil

Interference of light

Transmission of light

Linear magnification is equal to the ratio of.

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Size of the object to the size of the image

Size of the image to the size of the object

size of the object focal length

Size of the image focal length

The neutral atoms of all isotopes of the same element contain the same numbers of.

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Electrons and protons

Electrons and neutrons

Neutrons

Neutrons and protons

Laser light is considered to be coherent because it consists of.

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Many wavelengths

Uncoordinated wavelengths

Coordinated waves of exactly the same wavelength

Divergent beams

The convincing evidence of the wave nature of electrons was provide by.

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Stefan

Rayleigh

Davision and Germer

Balmer

Which parameter is an indication of colour of a star.

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Weight

Distance

Sixe

Temperature

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

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RADAR

LIDAR

SONAR

LASER

Hearing damage is possible at sound pressure of

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0 dB

50 dB

130 dB

195 dB

An emitter follower has

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High input impedance and high output impedance

High input impedance and low output impedance

Low input impedance and low output impedance

Low input impedance and high output impedance

When wind blows in the same direction in which the sound travels, the sound velocity

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Decreases

Increases

Remains unchanged

Becomes zero

The mass defect of Bohr's atomic model is

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Exclusion of nuclear motion

missing of classical and quantum theories

Failed to explain the fine structure of spectral line

All of the above

The emission of photons by a metal when electrons are incident is called.

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Photo electric effect

Pair production

X-rays production

Gama ray production

The amplitude of a vibrating body at resonance place in vacuum is.

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zero

Maximum

Minimum

Infinite

Thermal conduction in metals differs from thermal conduction in insulators,. The reasons for this is that , in metals heat can be transported by.

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Electrons

Lattice vibrations

Photons

Positive ions

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

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Alpha particles

Electrons

Protons

X rays

Temperature of a system remains constant in

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Adiabatic process

Isobaric process

Isothermal process

Isochoric process

A photon is chasing an electron, whose speed is 0.9 c What is their relative speed.

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0.1 C

C

0.8 C

0.9 C

A body in equilibrium may not have

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Velocity

Momentum

Acceleration

K.E

Venturimeter is a device used to measure

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Density of a fluid

Speed of a fluid

Pressure of a fluid

Viscosity of a fluid

The moment of inertia depends upon

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Mass of the body and its radius

Mass of the body and its angular speed

Mass and angular momentum

Mass as well as the distribution w.r.t axis of rotation

The first successful quantitative theory of atomic structure was formulate by

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David Bohm

Louis de Broglie

Neil Bohr

J Jj. Thomson

The SI unit of radioactivity is.

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Becquerl

Curie

Joule

rutherford

A diver leaving the diving board makes a somer sault in the air.

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This is due to gravitational force

The moment of inertia is decreased during the turn

His moment of inertia is increased

He pushes at the air for making the true

Magnetic field does not cause deflection in

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Alpha particle

Beta minus particles

Beta plus particles

Gama rays

Which of the given factors is increased in a step down transformer.

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Voltage

Current

Wattage

Resistance

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