Question # 1

Positron are produced during.

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Annihilation

ionization

Pair production

x rays production

When the number of turns in the solenoid is doubled without any change in teh length of the solenoid its self inductance will be.

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Halved

Doubled

4 times

8 times

The rms value of emf in a circuit is given by a factor of.

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0.637

0.7

0.707

1.11

Which Muslim Scientist gave the first clear description and correct analysis of pinhole camera.

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Nasir al Din Al tusi

Ibn al Haithem

Ibn Ishaqal kundi

al -Khawarizmi

The law of inertia was first time formulated by

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Galileo

Newton

Kepler

Planck

In which device is a permanent magnet used

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An electric bell

An electromagnet

A plotting compass

A relay

Ohm's law is applicable to

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Ohmic and non ohmic devices only

Semiconductors only

Metals only

Insulators only

In order to reduce uncertainty in momentum one must use light of.

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Short wavelength

Large wavelength

Wavelength of intermediate value

Wavelength of any value

The point of which the whole weight of the body acts

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zero point

Centre of mass

Centre of gravity

Equilibrium

LASER is a device which can produce

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Monochromatic beam of light

Coherent beam of light

An intense beam of lgiht

All of these

Velocity of sound in any medium deepness upon.

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Elasticity

Density

Volume

Mass

The number of electrons in U nucleus are.

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92

235

zero

143

An example of simple harmonic motion is

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Fast moving cricket ball

Motion of bicycle

Motion of a bee

Motion of simple pendulum

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

A generator running in reverse may be called as.

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A.C. Generator

D.C. generator

Motor

Commutator

The cathode ray oscilloscope is used for

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Displaying the waveform of given voltage

Displaying the wave form of given vibrations

Rectifying a.c to d.c.

Rectifying D.C. to A.C.

If we use two diodes and a centre tapped transformer we will get.

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A transistor

An amplifier

A half wave rectifier

A full wave rectifier

The output of two input OR gate is zero only when its.

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Either input is one

Either input is zero

Both inputs are zero

Both inputs are one

Diffraction is a special type of.

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Polarization

Interference

Dispersion

Scattering

Which given material is the best for making connecting wires

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Nichrome

Iron

Gold

Copper

What should be the shape of an ideal thermometer.

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Sphereical

Cubical

Cylindrical

Rectangular

Which of the following is believed to be carrier o nuclear forces.

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Lepton

Meson

Bason

Baryon

A water wave is an example of

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Electromagnetic wave

Longitudinal wave

Transverse wave

Reverberation

A small and a large rain drops are falling thgouth all.

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Large drop falls faster

Both move with same velocity

Small drop falls faster

Small drop does not fall

Good acoustic implies

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Obtaining as much reverberations as possible

Making the reverberation as small as possible

Obtaining the optimum of reverberations

Eliminating reverberations

A magnet is pushed horizontally towards a coil of insulated wire inducting an emf in the coilin which direction does the coil try to move.

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Downwards

Upwards

Away from the magnet

Towards the magnet

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

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Voltage

Current

Wattage

Resistance

Who described an ideal heat engine in 1840

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Boyle

Saadi Carnot

Kelvin

Currie

In a fission reactor which particle causes a uranium -235 nucleus to split.

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Alpha particle

Gama ray

Neutron

Proton

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

When a balloon sticks to the whiteboard It is an example of.

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Conoduction

Induction

Polarization

Conservation of charge

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