Question # 1

Frequency of x-rays depends upon.

Choose an answer

Number of electrons striking target

Accelerating potencial

Nature of the target

Both B and C

Radius of first Bohr's orbit is.

Choose an answer

0.053 nm

0.053 mm

0.053 micro meter

0.053 m

We can find from de Broglie formula

Choose an answer

Wavelength

Amplitude

Speed of wave

Frequency of wave

In the Bohr's model of the hydrogen atom, the lowest orbit corresponds to:

Choose an answer

Infinite energy

Maximum energy

Minimum energy

Zero energy

Which is not true for X rays

Choose an answer

X rays are not defected by electric field

X rays are polarized

X rays consist of electromagnetic waves

X rays can be diffracted by grating

The first theory about the structure of an atom was introduced by

Choose an answer

Neil Bohr

Einstein

Compton

Rutherford

The Balmer series is obtained when all the transition of electrons terminate on

Choose an answer

1^st orbit

2nd orbit

3rd orbit

4th orbit

The temperature of core of nuclear reactor is:

Choose an answer

1100°C

1200°C

1300°C

1400°C

Hydrogen atom spectrum does not lie in

Choose an answer

Ultraviolet region

Visible region

Infrared region

X ray region

The radius of 10th orbit in hydrogen atom is.

Choose an answer

0.053 nm

0.53 nm

5.3 nm

53 nm

If 13.6 eV energy is required to ionize the hydrogen atom, then the required energy to remove an electron from n=2 is:

Choose an answer

10.2 eV

0 eV

3.4 eV

6.8 eV

When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.

Choose an answer

Photoelectric effect

Piezo electric effect

Thermionic emission

Secondary emission

Photons emitted in inner shell transition are.

Choose an answer

Continuous X -rays

Discontinuous X rays

Characteristic X rays

Energetic X rays

First spectral series of hydrogen atom was discovered by

Choose an answer

Lyman

Rydberg

Balmer

Paschen

In Helium Neon laser, discharge tube is filled with Neon gas.

Choose an answer

10%

15%

85%

90%

Laser is a beam of light which is

Choose an answer

Monochromatic

Coherent

Unidirectional

All of these

For Paschen series, the value of 'n' starts from

Choose an answer

2

4

6

8

More Classes

Other Links

Ics Part 2 Physics Chapter 9 Test Online 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