Basic CS [3i Infotech Placement]: Sample Questions 134 - 136 of 243

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Question 134


Write in Short

Short Answer▾

What is Process spawning?


Understanding of Process Creation
  • When OS creates a process, it is called process spawning.
  • Another process typically requests process spawning- multitasking operating system then creates a child process
  • Example: Unix՚s fork system call or one of the spawn () library routines provided by MS-DOS, spawnle () .
  • The new sub process requires enough memory to execute both the child process and current program.

Question 135

Basic CS

Describe in Detail


What are tri-state device and why they are essential in a bus oriented system?


A tri-state device has three terminals.

The Three Terminals
  • When enables line is active output line follows input line, otherwise output line is free.
  • It helps bus oriented system.
    • Consider two buffers working on inverted logic.
    • Two buffers are receiving different inputs and the output of two buffers is connected to same bus.
    • Enabling and disabling enable line of two buffers selectively allows one of the inputs on the bus.

Question 136



The maximum KE of the photoelectron emitted from a surface is dependent on


Choice (4)


The intensity of incident radiation


The frequency of incident radiation


The angle of incidence of radiation of the surface


The potential of the collector electrode




Equation of Kinetic Energy
  • If we change the intensity of the incident beam keeping the frequency of light same, we only change the number of photons.
  • The change in that number cannot affect the kinetic energy of the emitted electrons.
  • The emission of electrons occurs due to a one electron one photon collision. If one photon of insufficient energy collides with an electron and then another one does, the energy of the electron does not become twice that of the incident photon- assuming that the energy gained from the first collision dissipates fast.
  • The maximum KE of the photoelectron emitted from a surface is dependent on the frequency of incident radiation - which changes the energy of each photon.

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