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12th Physics weekly Test - 2 ( Atomic and Nuclear physics )

St. Britto Hr. Sec. School - Madurai

12th Physics weekly Test - 2 ( Atomic and Nuclear physics )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The ratio of the wavelengths for the transition from n = 2 to n = 1 in Li⁺⁺. He⁺ and H is

1:2:3
1:4:9
3:2:1
4:9:36

Which of the following is not a moderactor?

liquid sodium
ordinary water
graphite
heavy water

The orbits in which electrons supposed to be revolving according to Rutherford are ___________.

square-shaped
circular
rectangular
linear

Radio isotope _________ is used to treat problems related to the thyroid gland.

sodium
cobalt
iron
iodine

The energy of a photon of characteristic X-ray from a Coolidge tubes comes from

the K.E of the electron of the target
the K.E of ions of the target
the K.E of the striking electron
an atomic transition in the target

In a nuclear reactor, cadmium rods are used to ______.

speed up neutrons
slow down neutrons
absorb neutrons
remove heat

In the given nuclear fission reaction, 'X' denotes which particle?

₉₂U₂₃₅ + ₀n₁\(\rightarrow\) ₅₆Ba¹⁴¹ + ₃₆Kr⁹² + 3X + Q

electron
\(\alpha\) - particle
neutron
neutrino

The half - life period of a radioactive element A is same as the mean life time of another radioactive element B.Intially both have the same number of atoms .then

A and B have the same decay rate initially
A and B decay at the same rate always
B will decay at faster rate than A
A will decay at faster rate than B

The splitting of spectral lines, when the atom is acted upon by a magnetic field is called __________ effect.

Bohr
Planck
Stark
Zeeman

The spectral series of hydrogen atom in UV region is called

balmer series
lyman series
paschan series
pfund series

Part - B

Generic 5 - Answer All Question

Explain in detail the nuclear force.

Explain the results of Rutherford \(\alpha\)-particle scattering experiment.

Discuss the process of nuclear fission and its properties.

What are the drawbacks of Rutherford atom model?

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