# IIT JEE/Electrons And Dual Nature Of Matter And Radiations Sample Test,Sample questions

## Question: ```A photo cell with a constant potential difference of V volts applied across its ends is illuminated by a point source from a distance of 25 cm. If the source is moved to a distance of 1 m, then electrons emitted from the photo cell will be ```

1.carry 1 / 4 th of their previous energy

2.are 1 / 6 th as numerous as before

3.are - 1 / 16 th as numerous as before

4.carry 1 / 4 th of their previous momentum

1.1870 eV

2.1 eV

3.300 eV

4.None of these

## Question: ```At stopping potential ```

1.K.E. = 0

2.P.E. = 0

3.K.E. = P.E

4.K.E. + P.E. = 0

1.200 volts

2.800 volts

3.1600 volts

4.3200 volts

1. 12 m

2.24 m

3.50 m

4.6 m

1.5.0 eV

2.6.3 eV 6.3 eV

3.7.0 eV

4.7.9 eV

## Question: ```If the momentum of a particle is doubled, then wavelength associated with particle will be ```

1.remains unchanged

2.half

3.double

4.None of these

1.Velocity

2.Momentum

3.Energy

4.All of above

## Question: ```In Einstein s photoelectric equation E = hv - W where E stands for ```

1.K.E. of emitted electrons

2.Maximum P.E. of emitted electrons

3.Mean kinetic energy of the incident particles

4.Total energy of all the emitted electrons

1.686 nm

2.1372 nm

3.343 nm

4.2058 nm

## Question: ```Photon A has twice the wavelength of photon B then energy of photon A is ```

1.Half that of B

2.Twice that of B

3.Thrice that of B

4.Four times that of B

## Question: ```Photons of energy 5.0 eV fall on a metal surface whose work function is 2.0 eV. Then ```

1.most energetic electron will have kinetic energy equal to 5.0 eV

2.all photoelectrons will have same energy of 2.0 eV

3.kinetic energy of most energetic electron will be 2.0 eV

4.kinetic energy of most energetic electron will be 3.0 eV

1.0.36 MeV

2.0.41 MeV

3.0.48 MeV

4.1.32 MeV

1.9.31 eV

2.13.6 eV

3.2.6 eV

4.zero

1.0.27 MeV

2.0.34 MeV

3.0.68 MeV

4.0.68 MeV

1.5:03:01

2.3:01:05

3.1:03:05

4. 5 : 1 : 3

## Question: ```When a monochromatic point source of light is at a distance of 0.2 m from a photoelectric cell cut off voltage and the saturation current are respectively 0.6 V and 18.0 mA. If same source is placed 0.6 m away from the photoelectron cell then ```

1.saturation current will be 1 / 4 th of their previous value

2.saturation current will be 18 mA

3.stopping potential will be 0.6 V

4.saturation current will be 6 mA

## Question: ```When a monochromatic point source of light is at a distance of 0.2 m from photoelectric cell, the cut-off voltage and the saturation current are 0.6 V and 18.0 mA respectively. If the same source is placed 0.6 m away from the photo cell, then ```

1.the stopping potential will be 0.2 V

2.the stopping potential will be 0.6 V

3.the saturation current will be 2.0 mA

4.the saturation current will be 6.0 mA

## Question: ```When distance between a monochromatic source and photo cell is 20 cm then cut off voltage and saturation currents are 0.6 volt and 18.0 mA respectively . If distance between the two is increased to 60 cm then ```

1.saturation current will be 2.0 mA

2.saturation current will be 6.0 mA

3.stopping potential will be 0.2 volt

4.stopping potential will be 0.6 volt

## Question: ```Work function of aluminium is 4.2 eV. If two photons each of energy 3.5 eV strike an electron of aluminum, then emission of electron ```

1.will be possible

2.depends on the smoothness of the surface

3.will not be possible

4.None of these

## More MCQS

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