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HiraRiaz
@hirariaz
40
school teacher
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Pakistan
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Created
2025-07-05 08:47
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hirariaz
Hive Learners
2026-06-11 04:16
What is the biasing requirement of the junctions of a transistor for it's normal operation? And how these requirements are met in a common emiiter amplifier?
Biasing requirement..... For normal operation of a transistor, (1) Emitter base junction is forward biased (2) Collector bse junction is reserved biased. For CE_ Amplifier ⚫ In common emiiter amplifier,
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hirariaz
Hive Learners
2026-06-10 15:28
What is meant by hysteresis losses? How is it used in the construction of a transformer?
Hysteresis loss... When a ferromagnetic material is placed in an alternating current solenoid,the energy is needed to magnetize and demagnetize the material during each cycle of magnetizing current. This
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hirariaz
Hive Learners
2026-06-09 13:43
Why the resistance of an ammeter should be very low?
Reason... As ammeter is connected in series with a circuit to measure the current. That's it should have very low residue because if the resisof the ammeter is high then it will become a load and will
hirariaz
Hive Learners
2026-06-08 15:25
Why ordinary silicon diode do not emit light?
Reason.... (1). It is opaque to ligh. (2). In ordinary silicon diodes, when electrons from n-side cross the junction and recombine with the holes on p_side ,greater percentage of energy is released in
hirariaz
Hive Learners
2026-06-01 04:23
What is crystal lattice, what is it's significance?
Crystal Lattice.. A crystalline solid consists of three dimensional pattern that repeat itself over and over again... In other words .. The whole structure obtained by the repetition of unit cell known
hirariaz
Hive Learners
2026-05-29 11:06
What is Black Body Radiation?.
Black Body Radiations. Thermal Radiation: When the body is heated ,it emits radiation called thermal Radiation. The nature of radiation depends upon the temperature.All the bodies not only emit radiations
hirariaz
Hive Learners
2026-04-15 13:35
What is heredity? What is Genes.
Asslam Alikum! Everyone 🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️ During reproduction, living things pass on their
hirariaz
Hive Learners
2026-02-28 10:55
Sexual Reproduction in Plants
Asslam Alikum everyone! ⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫ Sexual Reproduction involves the production of gametes (sperms and egg cells) and their fusion. 🕳️▪️I.e fertilization. Gametes are produced in special structures
hirariaz
Hive Learners
2026-01-29 05:27
What is immunity and it's types.
Asslam Alikum everyone! 🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️ ⚫Immunity ▪️▪️▪️▪️▪️▪️▪️▪️▪️ pathogens are everywhere around us all the time . However,we do not get disease all the time.
hirariaz
Hive Learners
2026-01-28 10:20
Roles of Microorganisms in our daily lives.
Useful Roles of Microorganisms in everyday life . A large number of Microorganisms are Very useful. 1 .... Some fungi called mushrooms are used as ingredients in recipes.They add flavor to meals . Edible
hirariaz
Hive Learners
2026-01-27 05:23
Peripheral Nervous System (PNS)
Peripheral Nervous System.. Peripheral Nervous System.(PNS) Consists of a network of nervous which spread in the body to connect all the body parts to the central nervous system.(brain and spinal cord).
hirariaz
Hive Learners
2026-01-19 01:45
Advantages of using renewable energy sources.
Renewable energy sources are available free of cost and they don't produce pollution while using them for generating electricity.Solar energy is an over lasting source of energy. Plants use it to make
hirariaz
Hive Learners
2026-01-18 14:09
Sources of Energy
The sun is the biggest source of energy.We also produce energy from flowing water,wind, plant coal ,crude oil, natural gas, uranium,etc. Renewable sources of Energy The sources of energy that will not
hirariaz
Hive Learners
2026-01-17 09:50
What is Deforestation ?
Deforestation means clearing of forests by natural causes or Humans. Large areas of forests have been cleaned for agriculture, factories ,roads, rail tracks and mining. Humans cut tree for making structures
hirariaz
Hive Learners
2026-01-10 11:52
What is chromotography ?
Chromatography is a technique used for separation of coloured components of a mixture. In this method different solutes are dissolved in the same solvent as components of the mixture. When the solution
hirariaz
Hive Learners
2026-01-08 14:40
What is wave? Describe it's type...
A wave is a disturbance in the medium which causes the particles of the medium to undergo vibratory motion about their mean position in equal intervals of time . There are two categories of waves Mechanical
hirariaz
Hive Learners
2026-01-07 15:21
What is vacuole?
Vacuole Cytoplasm of a plant cell contains a large organelles filled with water ,food molecules and many other substances called vacuole. It helps to maintain the shape of plant cell. It helps the plants
hirariaz
Hive Learners
2026-01-06 12:09
What is Lungs Cancer? And Causes of lungs Cancer
⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️ Lung Cancer is a disease of uncontrolled cell division in the tissues of the lung. The cells continue to divide without any control
hirariaz
Hive Learners
2026-01-05 09:13
What is mitochondria?
Mitochondria are rod shaped and double membranous cell organelles present in the cytoplasm of a cell. The inner membrane in mitochondria has finger like structure called cristae. Mitochondria are known
hirariaz
Hive Learners
2026-01-04 14:36
What is digestion? Physical digestion & Chemical digestion
⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫⚫🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️🕳️ The food we eat mostly consists of large and complex molecules of carbohydrates,fats , proteins etc. The complex food molecules
