Question # 1

The curve representing an adiabatic process is called

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isotherm

adiabat

adiable

none of them

Tick the series which lies in the visible region:

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Lyman series

Balmer series

Paschen series

Brackett series

P fund series

Heating effect of current utilized in:

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Electric motor

Electric toaster

Electroplating

Electric kettle

Both (B) and (D)

Silicon is one of the mot commonly used:

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onductor

Dielectric

Insulator

Semiconduction

Both (B) and (C)

The capacitance of a parallel plate capacitor depends upon

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Area of the plates

Separation between the plates

Medium between the plates

All of the above

Which one of the following is correct?

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V_o= 1.414 V_rms

I_ams= 1.414 I_o

VO = 10.70 Vrms

Both a and b

The solids which has structure in-between order and disorder are called

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amorphous solids

polymeric solids

crystalline solids

all of them

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

Energy stored in the spring of a watch is called

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Potential energy

Kinetic energy

Nuclear energy

Elastic potential

The value of current at resonance in series LCR circuit is affected by the value

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R only

C only

L only

R, C and L

Electron volt is the unit of

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Potential difference

Energy

Resistance

Capacitance

A body is dropped from a tower reaches the earth surface in 4 sec where g is 10 m/s²the height of tower is

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80 m

20 m

160 m

40 m

The magnitudes of vectors A.B and C are 3,4 and 5 units respectively.If A + B = C the angle between A and B is:

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π/2

cos^-1 0.6

tan^-1 7/5

π/4

The original source of waves is

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Moon

Sun

Wind

None of these

The information carrying capacity in an optical fibre is called

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wavelength

frequency

bandwidth

none of them

If the vibrations of the light wave are confined to one plane only, then this light is called

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unpolarized ligth

polarized light

sunlight

none of them

When the velocity of a body is increasing, the acceleration produced is

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No acceleration produced

Negative acceleration

Positive acceleration

None of these

The lower refractive index the fibre core has

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1.48

1.40

1.54

1.42

An axis which is at right angle to both X and Y and Y axes direction is in space is called

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Unit vector axis

Zero vector axis

Z-axis

None of these

Polymers have specific gravity which is:

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Low as compared to even the lightest metal

High as compared to the heaviest metal

Intermediate

Any of these

None of tese

The magnitude of X and Y component of P are 7 and 6.The magnitude of X and Y components of P + Q are 11 and 9 respectively. What is the magnitude of Q

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9

8

6

5

Finger prints on paper are identified by sprinkling fluorescent powder on it and observing it under

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Sun light

Sodium light

Infrared

UV

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