Question # 1

The permittivity of a medium.

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Is a measure of the density

Is equal to unity for air

Depends on the charge derisory of the medium

Determines the magnitude of an electric field that can be established by the medium

The velocity of sound will be greater in.

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Air

Water

Solids

Vacuum

What is the magnifying power of a convex lens of focal length 5 cm.

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3

5

6

20

Which of the following is not essential for the free oscillations of a mass attached to a spring.

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Elasticity

Gravity

Inertia

Restoring force

Beats occurs because of.

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Reflection

Refraction

Interference

Doppler's effect

In which device is a permanent magnet used

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An electric bell

An electromagnet

A plotting compass

A relay

The process of energy generation in sun and stars is.

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Fusion of heavy nuclei

fusion of light nuclei

Fission of light nuclei

Solar panels

Rate of flow of a liquid is expressed in

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Litre m-3

Litre s-1

Litre m-1

Litre s

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

If an object moves with velocity of light the apparent mass of the object as compared to list original mass is

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greater

Smaller

Same

zero

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

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Pressure

Temperature

Liquids

Fluids

The chemical behavior of an atom is determined by

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Mass number

Number of Isotopes

Atomic number

Binding energy

Which of the following properties of sound is affected by change in air temperature.

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Amplitude

Intensity

Frequency

Wavelength

The efficiency of Carnot engine is

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Less than one

Zero

Greeter than one

Infinite

Net change in entropy of a system in a Carnot's cycle in

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Positive

Negative

Zero

Infinite

Which of the following is dimensionless.

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Strain

Stress

Pressure

Volume

The unit Planck's constant is equivalent to that of.

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Energy

Force

Velocity

Angular momentum

Beats are the result of.

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Interference

Doppler's effect

Ultrasound

Polarization

Which one of the following is not true.

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velocity can be negative

velocity is a vector

Speed is a sccalar

Speed can be negative

If a single convex lens is placed closed to the eye then it can be used as

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Telescope

Simple microscope

Compound microscope

Opera glass

Binding energy per nucleon is.

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Greatest for heavy nuclei

Least for heavy nuclei

Greatest for light nuclei

Greatest for medium weight nuclei

Wattles current is said to flow when phase angle between virtual current and virtual voltage is

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0^o

90 ^o

180 ^o

270^o

Beats occur due to

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Reflection

Refraction

interference

Diffraction

In ideal gas equation PV = nRT , R is

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Universal gas constant

Avogadro's number

Plank's constant

Gravitational constant

The most common trivalent impurities are

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Boron , indium

Arsenic, indium

Arsenic, Antimony

Aluminium, Boron

The magnitude of the resultant of two forces may be increased by

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Increasing the angle between them

Decreasing the angle between them

Drawing the parallelogram to represent them

Drawing the force perpendicularly

On which of the following parameters the amount of charge that can be placed on a conductor does not depend on.

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Its capacitance

Its size or shape

its potential

Dielectric strength of the surrounding medium

Which law states that a change in the internal energy of a closed thermodynamic system is equal to the difference between the heat supplied to the system and teh amount of work by the system on the surrounding.

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Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Critical mass is the minimum mass needed for

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Fusion

H-Bomb

Chain reaction

Binding energy

The electric field intensity of a point charge varies.

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Directly as the square of the distance from the charge

Directly as the square of the charge

Inversely as teh distance from the charge.

Inversely as the square of the distance from the charge

A longitudinal sinusoidal wave has a wavelength of 1 cm and a period of 2s. Its wave velocity is.

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50 cm s-1

0.00t m s-1

100 cm s-1

5 m s-1

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