Question # 1

Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is

Choose an answer

Less than atmospheric pressure

Much less than atmospheric pressure

Greater than atmospheric pressure

Much greater than atmospheric pressure

Both C and D

The results of spectra obtained by Blamer were expressed in 1896 by

Choose an answer

Bohr

Rydberg

Planck

Rutherford

Coulomb

Selenium is:

Choose an answer

An insulator

A conductor

Both A and B

Excellent conductor

None of these

The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

Choose an answer

Ultra red region

Visible region

Ultraviolet region

Any of these

None of these

Tick the series which lie/s in. the infra-red region.

Choose an answer

Pfund series

Brackett series

Paschen series

All of these

None of these

The inkjet printer eject a thin stream of:

Choose an answer

Water

Oil

Ink

Any above

None of these

If the distance between two charges is doubled,the force between them will become:

Choose an answer

Double

Half

One third

One fourth

The spectrum emitted from hydrogen filled discharge tube is:

Choose an answer

Line spectrum

Discrete spectrum

And spectrum

Absorption spectrum

Both (A) and (B)

The range of wavelengths of colurs in the visible colours is

Choose an answer

140 nm to 456 nm

10 nm to 56 nm

410 nm to 656 nm

910 nm to 956 nm

None of these

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

Choose an answer

Small

Greater

Equal

Sometimes

X-ray are also known as

Choose an answer

Roentgen rays

Maxwell rays

Plank range

Einstein rays

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

Choose an answer

Helium

Neon

Both

None of these

Gaussian surface is always:

Choose an answer

Rectangular

Spherical

Cylinder

Box shape

Any of these

The photocopying process is called:

Choose an answer

Geography

Sonography

Xerography

Zerography

None of these

X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is

Choose an answer

3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

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

Choose an answer

one

two

three

four

five

Coulomb multiplied by volt by volt gives the unit called:

Choose an answer

farad

Ohm

Second

joule

Watt

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

Choose an answer

Short wavelength

Large wavelength

Very large wavelenth

Low frequency

Both (B) and (C)

By CAT scans, we can detect the density difference of the order of:

Choose an answer

1%

20%

30%

50%

70%

Ultraviolet region lies in ______ series

Choose an answer

Layman

Balmer

P fund

B racket

The results of spectra obtained by Balmer were expressed in 1896 by:

Choose an answer

Bohr

Rydberg

Planck

Rutherford

Coulomb

Static electricity is produced by the transfer of:

Choose an answer

Electrons

Protons

One fluid

Two fluid

None of these

More Classes

Other Links

Physics ECAT Pre Engineering Chapter 20 Atomic Spectra Physics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer