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

Ionization of a hydrogen atom originally in its ground state takes a minimum out of energy equal to.

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2.4 J

4.2 J

12.3 eV

13.6 eV

The unit of energy are the same as that of

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Force

Power

Work

Efficiency

In a resistor, when base width decreases with increasing Vbc, this phenomenon is called.

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Tunneling

Thermal runway

Pinch off

Early effect

The amplitude of sound wave determines its

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Pitch

Loudness

Reverberation

Interference

Which of the following type of force can do no work on the particle on which it operates.

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Gravitational force

Frictional force

Centripetal force

Elastic force

Who wrote books on sound and music.

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Galileo

Alkundi

Alberuni

Ibn al Haithem

Power of lens is measured in

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cm

Metres

cm-1

Dioptres

Difference between the molar heat capacity constant pressure and that a constant volume is equal to

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Root mean square velocity

Mean free path

Boltzmann's constant

Universal gas constant

A charge less region which separates p-type and n-type semiconductors in a p-n junction is known as.

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Polar region

Null region

Depletion region

Neutral region

Sounds of frequencies higher than 20,000 Hz are called.

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Super sonics

Infrasonic

Ultrasounds

Audible sound waves

When a ray of light enters from rarer medium to a denser medium its wavelength.

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Increases

Decreases

Remain constant

Vanishes

Why transistor is preferred to triode valve for use as an amplifier.

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Because it can handle large power

Because it has higher input impedance

Because it has higher voltage gain

Because it has lower voltage gain

Which of the following pairs represent units of the same physical quantity.

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Kelvin and joule

Kelvin and calrorie

Newton and calorie

Joule and calorie

What is the properly of materials that responds at an atomic or subatomic level to an applied magnetic field.

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Magnetism

electroplating

Diamagnetism

Electrolysis

Cs - 137 is a radioisotope used ot determine the thickness of the walls of steel pipes Cs 137 is chosen because it emits

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Radiowaves

Alpha particles

Beta particles

gama particles

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

A body is equilibrium may not have

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Momentum

Velocity

acceleration

K.E.

The weight of a man in an elevator moving down with an accelerating of 9.8 m s-2 will be come

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Half

Zero

9.8 N

Double

If the current in a wire which is placed perpendicular to a magnetic fields increases the force on the wire.

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Increases

Decreases

Remain the same

Will be zero

A stone is whirled in a vertical circle at the and of a string when the stone is at the highest position, tension in the string is

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Maximum

Zero

Equal to weight of the stone

Less than weight of the stone.

Interference through thin films depends upon

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Thickness of thin film

Nature of material of thin film

angle of incident light

All of the above

Power of the lens is one dioptre, if its focal length is.

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1/6 metre

1/2 metre

1 metre

8 metre

The nuclear model of the atom was derived partly from experiments involving the scattering of alpha particles performed by.

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Chadwick

Rutherford

Anderson

Einstein

Change in which parameter determines the work done by a gas during adiabatic prcoess.

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volume

Pressure

Temperature

Weight

The continuous X rays spectrum is due to an effect.

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Bremsstrahlung

Breaking radiation

Holography

both a and b

The spacing of electric field lines between two identical point charges of opposite signs

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Is not indication of the field direction

Is not dependent on the magnitude of the charges

Is an indication of the field strength

Is large when the charges are very large

A man in an elevator ascending with an acceleration will feel that his weight.

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Has increased

Has decreased

Remains the same

Vanishes

a spectrometer is used to study

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Spectrum

Waveform

Interference

Diffraction

The curve between the acceleration and velocity of a body in SHM is a

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Circle

Ellipse

Square

Parabola

In order to measure the true emf of an electrolytic cell it is necessary that.

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The measurement be made while charging the cell

No current be drawn from the cell

The cell be connected into a type circuit

The cell be connected into a parallel type circuit

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