Question # 1

The waves produced in a microwave oven have wavelength.

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12 mm

12 cm

12 m

12 mm

The three equation of motions are useful only for

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linear motion with increasing acceleration

line motion with uniform acceleration

linear motion with zero acceleration

linear motion with varying acceleration

Ethanol (alcohol) as a type of:

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Electric fuel

Bio fuel

Nuclear fuel

None of these

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

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-4

4

2

1

The absolute temperature of the tripple point of water is

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100°C

4°C

373 K

273.16 K

A black body is

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an ideal absorber

an ideal radiator

both of them

none of them

The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be

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500 m

500 nm

500 km

500 cm

None of these

Referring to above figure, current in the coil P grows from zero to its maximum value:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

All of above

Neither of above

When the total displacement is divided by total time taken, we get:

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Velocity

Average speed

Average velocity

None of these

The value of the Stephen's constant for black body radiations is given by

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5.6 x 10⁸Wm^-2K^-4

5.67 x 10^-8Wm^-2K^-4

2.9 x 10^-3mK

2.9 x 10³mK

A device used to measure the speed of liquid flow is known as

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barometer

speedometer

sphygmomanometer

venture-meter

The magnitude of induced emf depends upon the:

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

In the case of an incompressible fluid in stead flow the net rate of flow of mass entering one end of the tube of flow is equal to the net rate of flow of mass leaving the other end. This equation is called

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Quadratic equation

Equation of discontinuity

Equation of continuity

None of the above

When the temperature of source and sink of a heat engine become equal entropy change will be

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Zero

Max

Min

-ve

Drag force increases if speed of the object moving through the fluid:

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Increases

Decreases

Remains constant

None of these

Neutrons are

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positive charge

negatively charged

massless

neutral

Neutron was discovered in

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1915

1920

1925

1932

An alpha particle has a charge of

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+2e

-2e

-e

+3e

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

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546 K

273 K

546°C

273°C

Generally a temperature scale is established by using certain physical properties of a material which varies

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nonlinearly with temperature

linearly with temperature

either of them

none of them

Charge to mass ratio (e/m) of an electron is given by the relation

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e/m = 2V/Br²

e/m = 2V/B²r

e/m = 2V/B²r²

e/m = V/2B²r²

The smooth or steady stream-line flow is know as

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Laminar flow

Turbulent flow

Both a and b

None of the above

A field free region is found:

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Near the outer surface of a hollow charged metal sphere

In the interior of solid metal uncharged sphere

In the interior of solid metal charged sphere

Both (A) and (B)

Both (A) and (C)

In the phenomenon of hysteresis

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

meganetism goes along the magnetising current

none of them

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

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deuteron

deterium

protium

tritium

The molecules or ions in a crystalline solids are

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static

not static

randomly moving

all of them

S.I. unit of planks constant is

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J-s^-1

J.s

J.s^-2

J.s²

Swimming is based on the principle of

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Newton's 1st law

Newton's 2nd law

Newton's 3rd law

All

How many isotopes of helium are present?

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1

2

3

4

At resonance frequency the impedance of parallel resonance circuit is

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Maximum

Minimum

Zero

None of the above

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