General Science/Basic Science De Broglie Waves Sample Test,Sample questions

Question:
A magnetic lens can focus




1. sound waves

2.rays

3. a beam of light

4. a beam of electrons


Question:
Einsteins mass-energy relation is



1. E = mc

2. E = mc2

3.E = m2c

4.E = m2c2


Question:
Electron microscope works in


1.vacuum

2. atmospheric pressure

3. very high pressure

4. any pressure


Question:
he focal length of magnetic lens used in an electron microscope depends on

1. the velocity of electrons

2. the magnitude of current passing through energizing coils

3. the medium in between energizing coils

4. all the above


Question:
In an electron microscope electrons are focused by means of

1. convex lens

2. concave mirror

3.liquid lens

4. magnetic lens


Question:
In an electron microscope the object is enclosed in

1. a glass plate

2. liquid

3. water

4. colloidal film


Question:
In electron microscope the electron beam is focused by varying the

1. wavelength of electron

2. current through the emerging coil

3. velocity of electron

4. thickness of colloidal film


Question:
The de Broglie wavelength associated with an electron moving with a speed of 107m/s

1.0.728

2.7.28

3.72.8

4.728


Question:
The de Broglie wavelength of an electron of kinetic energy 500 e V is


1.54.92

2.0.5492

3.5492

4.5.492


Question:
The momentum of an electron if its wavelength is 2� is

2.3 ? 10-24 kg ms-1
3.315 ? 10-24 kg ms-1


1. 2.3 ? 10-24 kg ms-1

2.3.315 ? 10-24 kg ms-1

3.1.3 ? 10-24 kg ms-1

4.13 ? 10-24 kg ms-1


Question:
The special feature of an electron microscope is its

1. high resolving power

2. compactness

3. low cost

4. resolving power being equal to that of an optical microscope


Question:
The wave associated with a moving particle is called

mechanical wave

1. longitudinal wave

2. mechanical wave

3.de Broglie wave.n

4.Plancks wave


Question:
The wave nature of electron is applied in the field of

1. electron microscopy

2. fusion reactors

3. artificial radioactivity

4. satellite launching


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