Question # 1

The first orbit in the hydrogen atom has a radius.

Choose an answer

0.53 nm

0.053 nm

0.0053 nm

0.00053 nm

For an atom of hydrogen atom the radius of the first orbit is given by:

Choose an answer

H/me²

me/4h²

h2/4π² kme²

h² me²

The X-rays diffraction with crystal was first studied by

Choose an answer

W.H Bragg

W.L. Bragg

Michelson

None of these

The value of Rydberg constant is

Choose an answer

1.0974 x 10⁷ m^-1

1.0974 x 10^-7 m^-1

1.0974 x 10⁶ m^-1

1.0974 x 10^-6 m^-1

Hydrogen atom spectrum does not lie in

Choose an answer

Ultraviolet region

Visible region

Infrared region

X ray region

Charge on an atom is:

Choose an answer

Positive

Negative

Neutral

None of these

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 characteristic of Laser.

Choose an answer

Monochromatic

Coherent

Intense

Multi direction

In an electronic transition atom cannot emit.

Choose an answer

Infrared radiations

Visible radiations

Ultraviolet radiations

Gama radiations

The radius of hydrogen atom is:

Choose an answer

0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

Study of hydrogen visible spectrum in

Choose an answer

1886

1887

1895

1885

Target material used in x-rays tube have following properties.

Choose an answer

High atomic number and high melting pouint

High atomic number and low melting pouint

Low atomic number and low melting pouint

High atomic number only

When an electron in an atom goes from a lower to higher orbit its:

Choose an answer

K.E increases , P.E decreases

K.E increases , P.E increases

K.E decreases , P.E increases

K.E decreases , P.E decreases

Frequency of x-rays depends upon.

Choose an answer

Number of electrons striking target

Accelerating potencial

Nature of the target

Both B and C

Kx -Xrays are produced due to transition of electron from.

Choose an answer

K to L shell

L to K shell

M to K shell

M to L shell

Charge on positron is:

Choose an answer

Negative

Positive

Netural

None of these

The idea of laser device was first introduced by C.H. Towners and Authers Schowlan is

Choose an answer

1972

1965

1958

1913

X- ray diffraction reveals that these are

Choose an answer

Particle type

Wave type

Both wave and particle

None of above

More Classes

Other Links

Physics ICS Part 2 Chapter 20 Online MCQ's 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