Question # 1

First spectral series of hydrogen atom was discovered by

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Lyman

Rydberg

Balmer

Paschen

Those elements whose charge number z is greater then __________ are unstable:

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80

79

82

83

The electric field in some region of of space is uniform in magnitude and direction. Which one of the following five statements best desccribes the volume charge density (ρ) , in this region of space?

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ρ = 0

ρ decreases linearly in the direction of the electric field

ρ increases linearly in the direction of the electric field

ρ has a uniform value throughout the region

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

Lorentz force means the force acting on a particle, which is

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Magnetic force only

Electric force only

Sum of electric and magnetic force

None of these

In CRO, the output waveform of time base generator is

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Circular

Square

Sinusoidal

Saw-toothed

Yield stress is another name of

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Plasticity

Proportional limit

Elastic limit

Both (b) and (c)

The longest wavelength of Paschen series is.

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656 nm

1094 nm

1875 nm

2000 nm

In carbon resistors, then value of Blue colour is.

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6

7

8

9

Charge on an electron was determined by

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Ampere

Millikan

Maxwell

Bohr

Natural rubber is an example of:

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Crystalline solids

Amorphous solids

Polymeric solids

None of above

Which of the following are not hadrons.

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Muons

Mesons

Positrons

Neutrons

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

An expression for gain of an inverting amplifier is

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(R₁R₂)

None of these

At 0 K a piece of silicon is a

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Conductor

Semi-conductor

Insulator

All

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

The radioactive decay obeys the law

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