Question # 1

When the temperature of a body is equal to that of the surrounding then the body appears

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Dull black

Red hot

In thermal equilibrium

To be cold

The note of the lowest frequency is called

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beat

Overtone

Fundamental note

Harmonic note

Which of the following is not true.

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Velocity can be nagative

Velocity is a scalar

Speed is a vector

Speed can be negative

The energy in an electromagnetic wave is carried in the units called.

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Protons

Electrons

Neutrons

Nucleus

The energy following per second through a unit area held perpendicular to the direction of wave is.

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The loudness of the sound waves

The pitch of the sound waves

The intensity level of sound waves

The intensity of sound waves

The advantage of electron tube over semiconductor is.

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_{its efficiency}

its unlimited type

Its low consumption power

That it takes no warming up time

Such substance which undergo plastic deformation until they break are known as.

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Diatomic substances

Monoatomic substances

Ductile substances

Brittle substances

An immersion heater rated at 150 W is fitted into a large block of ice at 0 oC. The specific latent heat of fusionism 300 J g-1. How long does it take to melt 10 g of ice.

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5 s

10 s

15 s

20 s

The heat accepted and rejected by a Carnot engine operating between two heat reservoirs defines.

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The efficiency of the working substance of the engine

the ideal gas scale of temperature

The ratio of the absolute temperature of the reservoirs

The thermal capacity of the working substance

The band width of an audio amplifier is.

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10 Hz to 10 kHz

20 Hz to 54 Hz

20 Hz to 20 kHz

20 Hz to 60 kHz

Which one of the following materials has negative temperature coefficient.

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Conductors

Semiconductors

Insulators

Covalent bonds

Self inductances of solenoid is

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Directly proportional to the current flowing through the wire

Directly proportional to its length

Inversely proportional to area of corss section

Directly proportional to number of turns

If the pressure of a gas is doubled, then its thermal conductivity will

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Increases

Decreases

Remain constant

Be zero

The electromagnetic waves propagated outing space from antenna of a transmitter are known as.

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Infrared waves

Light waves

Radio waves

X-rays

Reverberation is the

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Presence of large number of overtones

presence of harsh and discordant notes

Presence of ultrasonic vibrations

Persistence of audible sound after the source has stopped

The law of equation of energy is applicable to the system whose constituents are.

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At rest

In orderly motion

in random motion

Moving at constant speed

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

Every point on any wave front can be considered as a new source of waves This statement is known as.

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Huygen's wave theory

Michelson's wave theory

Remain's effect

Rayligh's wave theory

A body is equilibrium may not have

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Momentum

Velocity

acceleration

K.E.

Lenz's was a physicist of.

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America

Russia

Japan

China

An electrical device is rated at 12 W , 2 A How many 1.5 V batteries are needed in the device.

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2

4

6

8

The rate of change of momentum of a body falling under gravity is equal to its.

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P.E.

K.E

Weight

Density

If the base emitter junction is forward biased and base collector junction is reverse biased the BJT is in.

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cut of mode

Amplification mode

Saturation mode

Inversion mode

What happen to entropy in an irreversible cycle.

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No gain in entropy

No change in entropy

Loss of entropy

A net gain of entropy

The chain reaction is controlled by a series of rods usually made of.

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uranium

Cadimium

Boron

Steel

During solid ficain the temperature.

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Remains constant at the freezing point

Increases at the freezing point

Decreases at the freezing point

Decreases at the melting point

The SI unit of solid angle is

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Degree

Radian

Steradian

Candala

What is the average K.E. of gas molecules at temperature equal to K.

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kt/3

3/2 KT

1/2 KT

2/3 KT

Though the wavelength of X-rays is smaller than that of visible light yet the speed of X-rays in vacuum is.

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longer that that of visible light

Smaller than that of visible light

Same as that of visible light

Unpredictable

The specific heat of all gases increases with temperature at high temperature decreases at low temperature expectation is

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Oxygen gas

Nitrogen gas

Mono atomic gas

Dia atomic gas

As a result of modulation, the resultant wave is called.

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Carrier wave

Modulated carrier wave

Matter wave

Energetic carrier wave

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