Question # 1

Data transmitted along glass-fiber cables is in the form of pulses of monochromatic red light each of duration 2.5 ns. Which of the following is the best estimate of the number of wavelength in each pulse?

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10³

10⁶

10⁹

10¹²

The SI unit of conductivity is

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ohm-m

ohm^-1m^-1

ohm-m^-1

ohm^-1m

Braking radiation causes:

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Continuous spectrum

Line Spectrum

Band spectrum

Discrete specturm

All of these

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

When the shear stress and shear stain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

The graphical representation of ohm's law is

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hyperbola

straight line

ellipse

parabola

The horizontal component of a projectile moving with initial velocity of 500 ms^-1at an angle 60° to x-axis is

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500 ms^-1

1000 ms^-1

250 ms^-1

Zero

Plan of a coil makes an angle of 20º with the lines of magnetic field. The angle between B and vector area of plane of coil is:

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Also 20º

70º

90º

180º

None of these

The principle characteristics of an ideal standard are

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Inaccessible and Invariable

Accessible and Invariable

Accessible and Variable

None of these

A force of 5 n is acting Y-axis. Its component along X-axis is:

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7 N

5 N

Zero

10 N

A fly is sitting on the objective of a telescope pointed towards the moons what effect is impacted in a photograph of the moon taken through the telescope

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The entire field of vision is blocked

There is image of the fly on the photograph

There is no effect at all

There is the reduction in intensity of the image

If a person with a spring balance and a body hanging from it goes up and up in an airplane then the reading of the weight of the body as indicated by the spring balance will

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Go on increasing

Go on decreasing

First increase and then decrease

Remains the same

When the light from two lamps falls on a screen, no interference pattern can be obtained. Why is this?

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the light from the lamps is white

the lamps emit light of different amlitudes

the light from the lamps is not coherent

the lamps are not point sources

Pure form of semiconductor is called

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Extrinsic semiconductor

Intrinsic semiconductor

N type

P type material

At any point on the right bisector of the line joining two equal and opposite charges

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At electric field is zero

The electric potential decreases with increasing distance from the centre

The electric potential is zero

The electric field is perpendicular to the line joining the charges

The instrument used to gather information from the far side of the Universe is

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Compound microscope

Radio telescope

Astronomical Telescope

Simple mircroscope

When the pressure of a fixed mass of a gas is decreased under isothermal condition there is

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Fall of temperature

Increase of density

No change in internal energy

A decrease in the value of PV

A small metallic sphere is dropped in a long jar of honey, it will move as

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Float in jar

It will move with g

Fall with acceleration less than g

Grain terminal velocity

Newton's rings are formed due to

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Refraction of light

Diffraction of light

Interference of light

None of these

Optical device used in spectrometer

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Simple microscope

Compound microscope

Telescope

Any of them

An aircraft is moving with a velocity of 300 ms^-1.If all the forces acting on it are balanced then

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It still moves with the same velocity

It will be just floating at the same point in space

It will be fall down instantaneously

It will lose its velocity gradually

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