Question # 1

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

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Increases, decreases

Increases, increases

Decreases, increases

None of these

The velocity of sound at same temperature is maximum in

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H₂

N₂

O₂

NH₃

Waves transport energy

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without transport energy

with matter

both of them

none of them

When a person jumps off the ground, the reaction force of the ground is

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greater than the weight of the person

smaller than the weight of the person

equal to the weight of the person

zero

While deriving equation of pressure by kinetic theory of gases, we take into account:

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Only linear motion of molecules

Only rotational motion

Only vibratory motion

All of these

The inside cavity of the black body is

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painted white

painted silver

blackened with soot

painted red

The law of conservation of mass gives us the

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equation of continuity

Bernoulli's theorem

both of them

none of them

The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe is called

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constant rate

volume rate

flow rate

steady rate

Which of the following changes at an antinode in a stationary wave?

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Density only

Pressure only

Both pressure and density

Neither pressure nor density

To make an LED, it is impreacticable to use:

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Silicon

Gallium arsenide

Gallium arsenide phosphide

Iron

Both (B) and (C)

When a mass 'm' is pulled slowly through a distance 'x_o' , the elastic potential energy of the spring would be

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P.E=Kx²_o

P.E= 1/2kx_o

P.E=1/2Kx²_o

P.E=Kx²_o

If R is gas constant for 1 gram mole, C_pand C_vare specific heat for a solid then

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C_p- C_v= R

C_p- C_{v < R}

C_p- C_{v = 0}

C_p- C_{v > R}

Which of the following is the longitudinal waves?

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Sound waves

Waves on plucked string

Water waves

Light waves

During each cycle, alternating voltage reaches a peak value

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One time

Two times

Four times

A number of times depending on the frequency

For a fixed force, larger is the mass of a body the

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greater is its acceleration

smaller is its acceleration

smaller is its weight

zero is its acceleration

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

A changing magnetic flux creates around itself

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An electromotive force

An electric field (changing electric flux)

Magnetic field

None of the above

Rate of flow can be expressed in

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litre/sec

litre-sec

sec/litre

sec/litre-m

A the top of the trajectory of a projectile, the directions of its velocity and acceleration are

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Perpendicular to each other

Parallel to each other

Inclined to each other at an angle of 45°

Anitparallel to each other

The nucleus left after the emission of some radiation is called:

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Parent nucleus

Daughter necleus

Mother necleus

Any of these

None of these

A diode which can turn its current ON and OFF in nono seconds is called:

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LED

Photodiode

An ordinary diode.

Both (A) and (B)

Both (B) and (C)

The value for systolic blood pressure for a normal healthy person is

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140 torr

80 torr

90 torr

120 torr

the symbol to be used in relativity problems denotes:

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Dilated time

Proper time

Life time

Half time

None of these

On heating, glass gradually softens into a paste like before it becomes a very viscous liquid at almost

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600°C

7600°C

800°C

900°C

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

The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called:

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Critical temparature

Temperature of vaporization

Melting point

Both (A) and (C)

Both (A) and (B)

In a normally biased n-p-n transistor, an electron c current I_Eflows from the

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emitter into the base

collector into the base

base into collector

none of these

Mass of proton is

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1.67 x 10^-27kg

1.67 x 10^-31kg

1.66 x 10^-34kg

1.67 x 10^-17kg

Blood vessels can be stretch like rubber, therefore they are

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rigid

hard

very thick

not rigid

In reverse-biased p-n junction, the reverse current is due to flow of:

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Minority charge carriers

Majority charge carriers

Free electrons from p to n-region

Holes from n to p-region

all are true except (B)

Fire fighters have jet attached to the head of their water pipes in order to

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Increase the mass of water flowing per second

Increase the velocity of water flowing out

Increase the volume of water flowing per second

Avoid wastage of water

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