Question # 1

Which force pushes up a body in fluid

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Thrust

Lift

buoyant

Pressure

An instrument used to find the direction of the earths magnetic field is known as.

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Magnetometer

Electroscope

Cyclotron

Particle accelerator

Which BJT configurations used for signal inversion.

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CE

CC

CB

BE

The refractive index of benzenes is 1.5 What is the critical angle of benzene.

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0.667 ^o

42 ^o

48^o

90^o

A wave that consists of oscillations occurring perpendicular to the direction of energy transfer is called.

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Transvers wave

Longitudinal wave

Stationary wave

Shock wave

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

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susceptibity

Diamagnetism

Hysteresis

Retentivity

Which quantity has different units from the other three.

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Density x volume x velocity

Rate of change of momentum

Young's modulus x area

Weight

Critical mass is the minimum mass needed for

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Fusion

H-Bomb

Chain reaction

Binding energy

The Circular motion of a particle with constant speed is.

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Periodic and SHM

Periodic but not SHM

linear and SHM

Neither periodic nor SHM

A terrestrial telescope produces

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An react and real image

An inverted and real image

An inverted and virtual image

An erect and virtual image

Convention is the transfer of thermal energy by means of currents in

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Pressure

Temperature

Liquids

Fluids

Human's eye acts like a

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LASER

Mirror

Lens

Fibre optics

For the angular momentum of a system to remains constant, the external torque should be

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small

Large

Neither small nor large

zero

The power of convex lens of focal length 50 cm will be

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1,0 dioptre

2.0 dioptre

4.0 dioptre

5.0 dioptre

The spectrum of radiation due to transitions between energy levels in an atom, other absorption or emission is called.

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Atomic spectrum

Molecular spectrum

Grating spectrum

Normal specturm

Who developed hypothetical heat engine that has the maximum possible efficiency in 1824

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Saadi carnot

August Otto

rudolf Diesel

Kari Benz

The diameter of a lens is called.

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Focal length

Principal axis

Optical centre

Aperture

The tunnel effect makes possible

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Alpha decay

Gama rays

Positive Beta decay

negative Beta dacay

Why FET amplifiers are called voltage controlled devices.

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Input is a current signal

Output is a current signal

Input is a voltage signal

Output is a voltage signal

The SI unit of momentum is.

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kg m s-2

kg m2 s-2

kg m s-1

kg s-1

Ebers-Moll model describes the working of a

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BJT

FET

MOSFET

UJT

A complete amplifier circuit made on a silicon chip and enclosed in a small capsule is

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Inductor

Metal detector

Diode

Operational amplifier

A physical quantity which produces rotation in a body is called.

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Force

Torque

Momentum

accelerate

Waves transfer

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Frequency

Velocity

Energy

Wavelength

The photons emitted in inner shell transition are.

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Alpha particle

Beta particle

Gama particle

Characteristic X-rays

In planetary motion

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Angular speed remains constant

Angular momentum remains constant

Linear speed remains constant

Linear momentum remains constant

A p-type material is formed then a semiconductor is doped with

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Trivalent impurity

Tetravalent impurity

All of above

A material having excess of free electrons

Monochromatic ight is of single.

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Frequency

Wave length

Amplitude

Pitch

Entropy of universe is increasing day by da due to.

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Power generating processes

Energy used into work

Depletion of ozone

All of the above

The distance between any two consecutive bright or dark fringes is called.

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Wavelength

Amplitude

Fringe spacing

Wavelet

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

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