Question # 1

The Stephen-Boltzmann law for the black body radiation is given by

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E = T²

E = -T²

E = T⁴

E = -T⁴

The work done on the system by the environment is considered as

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positive

negative

zero

any one of them

The working of all DC electric meters (galvanometers, ammetersand voltmeters) depends upon

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Heating effect of current

Chemical effect of current

Magnetic effect of current

Electromagnetic effect of current

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

A force of 50 dynes is acted on a body of mass 5 g which is at rest, for an interval of 3 seconds, then impulse is

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0.15 x 10^-3Ns

0.98 x 10^-3Ns

1.5 x 10^-3Ns

2.5 x 10^-3Ns

The quantity having the same unit as that of emf is:

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Force

Energy

Potential

Current

Charge

The range of projectile is 50 m whenθ is inclined with horizontal at 15°. What is the range whenθ becomes 45°?

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400 m

300 m

200 m

100 m

Strength of magnetic field is measured in SI units, in:

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N

N/Am

Am/N

Nm/A

None of these

If the displacement of a body executing S.H.M is plotted against time, then the curve is known as

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frequency of S.H.M

period of S.H.M

wave form

none of them

The current sensitivity of the galvanometer is

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C/BAN

BAN/C

CAN/B

CBN/A

The natural frequency of a pendulum which is vibrating freely, depends upon its

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mass

length

material

all of them

The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to

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Coulomb's law

Gauss's law

Biot-Sarwat law

Ampere's law

Which one is not produced by sound waves in air?

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Polarization

Diffraction

Refraction

Reflection

The relation V = IR represents

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Ampere law

Faraday's law

Ohm's law

Len's law

The quantity F x t is called as

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momentum

velocity

acceleration

impulse

For making cooking utensils, which of the following pairs of properties is most suited?

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Low specific heat and high conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

High specific heat and low conductivity

The artillery shells travel along parabolic paths under the influence of

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magnetic field

electric field

electromagnetic field

gravitational field

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

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Metal has high specific heat

Metal has high thermal conductivity

Metal has low specific heat

Metal has low thermal conductivity

The field around a moving charge is called

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magnetic field

conservative field

non-conservative field

none of these

The alternative voltage of current is actually measured by:

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Its RMS value

Square root of its mean square value

Instantaneous value

Peak value

Both (A) and (B)

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

The unit of conductance is

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ohm

meter

mho

ohm-meter

The rate at which the free electrons pass through any section of a metallic wire from right to left is:

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Greater than the speed at which they pass from left to right

Less than the speed at which they pass from left to right

The same speed at which they pass from left to right

Any of above

None of them

Wave disturbances may also come in a concentrated bundle, like shock wave from an aeroplane flying at

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subsonic speed

sonic speed

super sonic speed

any one of them

Velocity of sound in vacuum (in m/s) is

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330

1000

156

0

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none of them

The flow of an ideal fluid is

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streamline flow

incompressible flow

non-viscous

all of the above

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Neutrons are

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positive charge

negatively charged

massless

neutral

The magnitude of the displacement is a line from initial position to final position which is

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straight

curved

either be curved or straight

none of them

At high speed, fluid friction _____ and fuel consumption ___,:

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Increases, decreases

Increases, increases

Decreases, increases

None of these

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