Oil rises in lamp wick, Why?

Q: How is the boiling point of water affected when some salt is added to it?

A: When salt is added to water, there is dissociation of sodium chloride into sodium and chlorine ions.…

Q: atoms ever in contact

A:

Q: Chinawares are wrapped in straw or paper before packing. Why?

A: Chinaware are wrapped in straw or paper before packing, as when it falls on ground, the force of…

Q: When wax is coated on clothes , they become water proof. Why?

A: When there is no wax, adhesive force between cloth and water molecules is stronger than the cohesive…

Q: Many dry cereals are fortified with iron, which is added to the cereal in the form of small iron…

A: The iron particles are separated from the cereal with the help of magnets. we need to grind and…

Q: Why does the ability of a metal to conduct electricity decrease with increasing temperature?

A: SOlution: how does the ability of a metal to conduct electricity affect with increasing temperature.

Q: 12. Seawater has ɛ, = 80. Its susceptibility is (a) 81 (b) 79 (c) 5.162 x 1010 F/m (d) 7.074 × 10-1º…

A: Susceptibility is a dimensionless quantity used for dielectrics, which gives an idea about the…

Q: Particles of camphor move around on the surface of water. Why?

A: The surface tension of water decreases when the impurities are dissolved in it. The camphor is…

Q: name of the substance?

A:

Q: OI only OIl only IIl only OI and II only 1, Il and III

A: in all three of them i.e (i),(ii) and (iii) ameter is connected correctly

Q: is amber and rabbit fur negatively charged

A: Basically anything in this universe is electrically neutral. i.e the sum of negative charge and…

Q: If you had beeswax attached to one end of a metal skewer and you placed the other end of the skewer…

A: As it is known that the metals are the good conductor of heat

Q: Why do some animals curl up into a ball when they are cold?

A: By Stefan's law of energy radiation, rate of radiation of energy is directly proportional to surface…

Q: How do the atoms of a solid move?

A: Atoms in a solid only shake back and forth in place. The reason is In the solid the particles the…

Q: When a pressure of 2.0 MPa is applied to a sample of kerosene, it contracts by 0.15%. The value of…

A: Given: Applied pressure, P=2.0 Mpa=2×106 Pa Volume contraction, ∆VV=0.15%=0.15100

Q: Why does the balloon filled with water did not pop out like the balloon filled with air when it is…

A: We have to write why does the balloon filled with water did not pop out like the balloon filled with…

Q: Why do metals feel cold even when they are at room temperature?

A: Metals feel cold

Q: Give two types of conduction .

A: Conduction is broadly classified into two types : 1. Conduction of heat - When a substance is…

Q: Tents are coated with thin layer of aluminium hydroxide. Why?

A: Tents are coated with a thin layer of aluminium hydroxide because aluminium hydroxide is insoluble…

Q: Oil spreads over surface of water whereas water doesnot spread over the surface of oil. Explain.

A: The surface tension of the water is higher than the oil. Therefore, when oil is poured over water,…

Q: Why hot water bottles are used for fomentation?

A: Hot water has high specific heat capacity. Due to this, the water remains hot for a longer duration.

Q: Air, CO2, some plastics, water, and hand sanitizer are all transparent materials. Yet you can tell…

A: any object when interacts with light the following four phenomena can occur: 1.Specular Reflection:…

Q: What results from an unequal sharing of electrons between atoms?

A: Electrons are carriers of charges.

Q: Why are throttling devices commonly used in refrigeration and air-conditioning applications?

A:

Q: Water can be sprayed easily when soap is added to it, Why?

A: Because addition of soap decreases the surface tension of water. The energy for spraying is…

Q: Why does ink from ordinary fountain pen spreads if water is spilled on a page written with it.

A: Fountain pens rely on a combination of gravity and changes in air pressure to write on paper that is…

Q: Why do some animals curl up into a ball when they are feeling cold?

A: The total energy radiated by a body depends on its surface area . Thus when the animal feel very…

Q: What is Insulation ?

A: Insulation is used to fill the spaces such as little gaps behind walls and above ceiling of the home…

Q: Qll The prodeet of the two influehces Choose the answe H BT At 2/8^A^ t.

A: It is the commutative property of operater

Q: Water is used in hot water bottles for fomentation. Give a reason.

A:

Q: Grike cleiter: Distames= 15 m . =25 N Caleululi W corrk done?

A:

Q: true or false ? is Oxygen is an example of matter .

A: Matter is made from atoms. Every substance has a unique number of protons, neutrons, and electrons.…

Q: 2Ω 4Ω www Ε 6Ω 4Ω. ,5Ω Α Β

A: Here, 2Ω resistor and the 4Ω resistor between the points C and E are in series. So, their equivalent…

Q: Water can form large dewdrops in nature. How droplets made of vegetable oil instead of water be…

A: Water can form large dewdrops in nature. Surface tension of vegetable oil is less than that of…

Q: Name the metal which is liquid at room temperature?

A: In general, all the metals are in solid state at room temperature except mercury.

Q: what contains a piece of metal that bends when it gets hot

A: A breaker contains a small piece of metal that bends when it gets hot.

Q: What is mole?

A: Mole is the unit of amount of substance. It consists of Avogadro number of particles. Avogadro…

Q: Dry table salt is an insulator whereas molten salt is a  conductor. Why?

A: The flow of free electrons is called current. The electrical conductivity is the ability of a…

Q: Soldering becomes easy due to the addition of flux. Why?

A: Step 1A flux is a chemical cleaning agent which have function is metallurgy and metal joining. Some…

Q: Ice is packed in saw dust, Why?

A: Saw dust is a very bad conductor of heat. So, if ice is kept in saw dust, ice will not melt easily.

Q: Pure water is an insulator whereas salty water is a conductor. Why?

A: It is a true statement that pure water is an insulator whereas the salty water is a conductor.