What is floating?
Q. What is floating? Top Answer Solution:Floating – An object will float on a liquid if its density is less than the density of the liquid. When an object is placed over a liquid whose density is more than the…
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What is sinking?
Q. What is sinking? Top Answer Solution:Sinking – An object will sink in a liquid, if its density is more than the density of the liquid. When an object is placed over a liquid whose density is less than the…
Differences between real image and virtual image
Q. Differences between real image and virtual image. Top Answer Solution:Differences between real image and virtual image. Real image Virtual image 1. Real image is formed when light rays from an object, after reflection, actually meet (intersect) at one point.…
What is Sublimation?
Q. What is Sublimation? Top Answer Solution:The process by which a solid directly changes into a gas on heating is called sublimation. Again, vapours of these substances on cooling, directly solidify, Camphor, naphthalene, iodine and ammonium chloride are examples of…
What is Evaporation?
Q. What is Evaporation? Top Answer Solution:The process of conversion of a liquid into vapour at the temperature below its boiling point is called evaporation. Evaporation is a slow process and takes place only at the free surface of a…
What is Freezing or Solidification?
Q. What is Freezing or Solidification? Top Answer Solution:The process in which a substance in liquid state changes into solid state at a fixed temperature is called freezing or solidification. The fixed temperature at which freezing of a liquid takes…
What is Condensation or Liquefaction?
Q. What is Condensation or Liquefaction? Top Answer Solution:The process in which a substance in the vapour (gaseous) state changes into liquid state at a fixed temperature is called condensation or liquefaction. The fixed temperature at which condensation takes place…
What is Vaporization or Boiling?
Q. What is Vaporization or Boiling Top Answer Solution:The process in which a substance in the liquid state changes to a vapour (gaseous) state at a fixed temperature is called vaporisation or boiling. The fixed temperature at which a liquid…
What is Melting or Fusion?
Q. What is Melting or Fusion? Top Answer Solution:The process in which a substance in solid state changes into liquid state at afixed temperature is called melting or fusion. The fixed temperature at which asolid melts into a liquid are…
Reasons for using mercury in thermometers
Q. Reasons for using mercury in thermometers. Top Answer Solution:Reasons for using mercury in thermometers. Related Links
Differences between conduction, convection and radiation
Q. Differences between conduction, convection and radiation. Top Answer Solution:Differences between conduction, convection and radiation. Conduction of heat Convection of heat Thermal radiation 1. Convection requires a medium for heat transfer but there is no actual motion of medium particles…
The loudness level of some characteristic sounds
Q. The loudness level of some characteristic sounds. Top Answer Solution:The loudness level of some characteristic sounds. Source of sound Loudness level in decibels Sensation of sound 1. Rustling of tree leaves 10 Very very faint sound 2. Whisper 20…
Differences between musical sound and noise
Q. Differences between musical sound and noise. Top Answer Solution:Differences between musical sound and noise. Musical sound Noise 1. Musical sound produces a pleasant effect in our ears. 1. Noise produces a jarring effect in our ears. 2. It is…
Difference between Speed and Velocity
Q. Difference between Speed and Velocity. Top Answer Solution:Difference between Speed and Velocity. Speed Velocity 1. The rate at which an object covers distance. 1. The rate at which an object changes its position in a specific direction. 2. Speed…
Differences between distance covered and displacement.
Q. Differences between distance covered and displacement. Top Answer Solution:Differences between distance covered and displacement. Distance Covered Displacement 1. It is the actual length of a path covered by a moving object irrespective of the direction of motion. 1. It…
Differences between mass and weight.
Q. Differences between mass and weight. Top Answer Solution:Differences between mass and weight. Mass Weight 1. The mass is the quantity of matter present in an object. 1. The weight is the force with which an object is attracted by…
Who is known as the father of Atom Bomb?
Q. Who is known as the father of Atom Bomb? Top Answer Solution:J. Robert Oppenheimer is often referred to as the “father of the atomic bomb.”Oppenheimer was an American theoretical physicist. Related Links
Who invented the electric bulb?
Q. Who invented the electric bulb? Top Answer Solution:Thomas Alva Edison is best known for inventing the electric light bulb. Related Links
Who gives the famous theory of relativity E = MC2?
Q. Who gives the famous theory of relativity E = MC2? Top Answer Solution:Albert Einstein gave the theory of relativity E = MC2. Albert Einstein was a brilliant physicist and mathematician who is considered one of the greatest scientists in…
Who discovers the law of gravity?
Q. Who discovers the law of gravity? Top Answer Solution:Sir Isaac Newton discovered the law of gravity. Sir Isaac Newton was an English mathematician, physicist, and astronomer who made significant contributions to the fields of mathematics, physics, and astronomy.Newton’s most…
What is anode ray?
Q. What is anode ray? Top Answer Solution:A beam of positively charged ions is known as an anode ray. Related Links
What is cathode ray?
Q. What is cathode ray? Top Answer Solution:Cathode rays are streams of tiny electron-containing particles. Related Links
What are the main features of the structure of atoms?
Q. What are the main features of the structure of atoms? Top Answer Solution:The main features of the structure of atoms: Related Links
What are the properties of neutrons?
Q. What are the properties of neutrons? Top Answer Solution:* Neutrons have no charge or neutral charge unlike proton (+) and electron (-).* The mass of neutron is 1.676 x 10^-24 (1 amu).* Neutrons are regarded as stable particles since…
What are the properties of protons?
Q. What are the properties of protons? Top Answer Solution:• Protons have positive (+) charge.• Protons are heavy in comparison to electrons having about 1836 times greater than the mass of an electron.• Its mass is the same as that…
What are the properties of electrons?
Q. What are the properties of electrons? Top Answer Solution:• The mass of an electron is very small about 1/1837 the mass of a proton or neutron.• Electrons have a negative (-) charge• All electrons from all sources have the…
Who did first discover the electrons?
Q. Who did first discover the electrons? Top Answer Solution:Electrons were first discovered by J.J. Thomson in 1897.• An electron is a subatomic particle with a (-) negative electric charge.• It is found in the outer part of an atom,…
Who did discover Neutrons first?
Q. Who did discover Neutrons first? Top Answer Solution:Neutrons were first discovered by James Chadwick in 1932.• Neutrons are subatomic particles found within an atom’s nucleus, alongside protons.• Neutrons are electrically neutral, meaning they have no electrical charge.• They are…
Who did discover protons first?
Q. Who did discover protons first? Top Answer Solution:Protons were first discovered by Ernest Rutherford in 1919.• A proton is a subatomic particle with a positive (+) electric charge.• It is found in the nucleus of an atom, along with…
Who discovered the atoms first?
Q. Who discovered the atoms first? Top Answer Solution:John Dalton discovers the atoms.* An atom is the basic unit of matter that forms a chemical element.* Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms.* Atoms…