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

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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

Posted on by R4R Team

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