Question # 1

Recently a complex crystalline structure known as Yetrium Barium Copper Oxide have been reported to become superconductor at

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125 K

25 K

263 K

163 K

If force and displacement are in opposite direction, the work done is taken as

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Positive work

Negative work

Zero work

Infinite work

At a given instant, a photon moves in +x direction in a region where there magnetic field in -z direction. The magnetic force on the proton will be the:

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-y direction

+y direction

+z direction

-z direction

None of these

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Air currents of the earth atmosphere

Surface tension effect

Viscous force exerted by air

To see the minor details of the object by microscope, it should have:

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High magnifying power

High resolving power

Am objective of larger focal length

None of these

In case of point, source of light shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

For the virtual image, option _______ is not correct:

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1/p = 1/f -1/q

1/f = 1/p -1/q

1/p=1/p-1/f

1/p=1/f+1/q

The equation of continuity is

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A₁A_{2 = V}₁V₂

A_1/_V_{1 =}A_2/V₂

_V_1/A₁₌V_2/A₂

A₁_V_{1 =}A₂V₂

At high altitude the blood oozes out of the nose and ear because

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The blood pressure increase at high altitudes

The percentage of oxygen in the air increase

The atmospheric pressure decrease there

The density of blood decrease at high altitudes

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

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Equal to 1

Less than 1

Greater than 1

Infinity

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

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one

two

three

four

five

Petrol engine converts heat energy to work roughly

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20%

25%

30%

40%

The diffraction is found to be prominent when the wavelength of light is

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small as compared with the size of obstacle

large as compared with the size of obstacle

equal as compared with the size of obstacle

Very small as compared with the size of the obstacle

The magnitude of work is zero when the angle between force and displacement is

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0^o

90^o

10^o

None of these

Huygen's principle states that:

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Light travels in straight line

Light has dual nature

Either of these

None of these

Light waves are:

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Mechanical waves

Electromagnetic waves

All of above

None of above

If the velocity-time graph is a straight line, then it is

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parallel to velocity-time

parallel to time axis

inclined to velocity axis

inclined to time-axis

Which of the following pairs of electrical units are the units equivalent?

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Coulomb; As^-1

Farad ; C^-1V

Pascal: Nm^-2

Volt ; JC

At points where the crest (or trough) of one wave coincides with the crest (or trough) of the other wave, the wave produces

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destructive interference

constructive interference

diffraction

dispersion

The lower refractive index the fibre core has

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1.48

1.40

1.54

1.42

Deceleration means the speed of the body is

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Increasing

Decreasing

Just moving

None of these

A projectile is thrown at an angle of 30° with horizontal with a velocity of 980 m sec^-1. The time of flight to reach the highest point of its trajectory is:

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50 sec

100 sec

150 sec

250 sec

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