# 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

Posted Date:-2021-10-15 13:52:53

## Question: ```Einsteins mass-energy relation is ```

1. E = mc

2. E = mc2

3.E = m2c

4.E = m2c2

Posted Date:-2021-10-15 13:52:53

## Question: ```Electron microscope works in ```

1.vacuum

2. atmospheric pressure

3. very high pressure

4. any pressure

Posted Date:-2021-10-15 13:52:53

## 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

Posted Date:-2021-10-15 13:52:53

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

1. convex lens

2. concave mirror

3.liquid lens

4. magnetic lens

Posted Date:-2021-10-15 13:52:53

## Question: ```In an electron microscope the object is enclosed in ```

1. a glass plate

2. liquid

3. water

4. colloidal film

Posted Date:-2021-10-15 13:52:53

## 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

Posted Date:-2021-10-15 13:52:53

## 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

Posted Date:-2021-10-15 13:52:53

## 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

Posted Date:-2021-10-15 13:52:53

## Question: ```The momentum of an electron if its wavelength is 2ï¿½ 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

Posted Date:-2021-10-15 13:52:53

## 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

Posted Date:-2021-10-15 13:52:53

## 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

Posted Date:-2021-10-15 13:52:53

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

1. electron microscopy

2. fusion reactors