What is measurement? Measurement is the process of comparing an unknown quantity with a known quantity. Or, Measurement is expressing characteristics or properties of an object in terms of number and unit. Like expressing length of a table as 1.5 meter, mass of a rice pack as 20 kg etc. Importance of measurement Standardization:- Measurement has made standardization of physical quantities in terms of predefined known quantities possible. This led to a revolution in field of science, technology, medicine, trade and commerce. In the absence of standard quantities the ways of expressing quantities were not uniform. Conficts used to arise while exchanging goods. Quantification:- Measurement helps to quantify unknown quantities. The measured values can be used for fur...

Differences between fundamental quantities and derived quantities Fundamental quantities vs derived quantities. Independent quantities vs dependent quantities. Base quantities vs derived quantities. Base quantities, fundamental quantities and independent quantities terms are used interchangeably. While Derived quantities and dependent quantities terms are used interchangeably. The differences between fundamental and derived quantities are as follows:- Fundamental quantities Derived quantities Those physical quantities which are independent of other quantities are called fundamental or independent quantities. Those physical quantities which dependen upon fundamental quantities for their expression in mathematical form are called derived or dependent quantities. ...

Physics is defined as the scientific study which is concerned with describing the interactions of energy, matter, space, and time, and it is especially interested in what fundamental mechanisms underlie every phenomenon. Applications of physics Knowledge of physics is useful in everyday situations as well as in nonscientific professions. Physics is the foundation of many important disciplines and contributes directly to others. Some applications of physics are as follows:- Engineering :- Most branches of engineering are applied physics. In architecture, physics is at the heart of structural stability, and is involved in the acoustics, heating, lighting, and cooling of buildings. Chemistry :- In chemistry knowledge of physics is required to understand the interactions of atoms and molecules. Biology :- Physics has many applications in the biological sciences. On the microscop...

Why is detergent more useful than soap? Why is detergent preferred over soap? Following points defend that detergent is more useful thant soap :- Solubility of detergent in water is greater than solubility of soap in water. This makes detergent better than soap for washing purpose in hard water. Detergents don’t give scum in hard water while soaps give scum in hard water. Detergents have stronger cleansing effect than soap. Usage of washing detergents is more economical than soap. That is why for industrial and large amount use detergent is preffered over soap. Detergent is also suitable to use with acidic water. Detergent and soap Differences between soap and detergents

Why is 1,2,3-Propanetriol used in fruits and food materials? Reasons for which glycerol is used in fruits and food materials are as follows :- Moisturizing agent :- Its moisturizing property prevents fruits and food materials from drying. Sweetening agent (sugar alcohol) :- It is used to add sweet taste to food materials instead of sucrose (Table sugar C₁₂H₂₂O₁₁).

  RE-111'AC'     Compulsory Science     SEE 2074 (2018)     Answer all the questions.  (Group 'A') 15x1=15 Write short answers of the following questions. Name two instruments that are based on the law of flotation. Instruments based on law of floatation are as follows :- Hydrometer like lactometer, alcoholometer, saccharometer, battery hydrometer, etc. Boats and ships. Flush tank of toilet. Automatic liquid volume indicator. Define nuclear reaction that takes place in the Sun. Nuclear reaction that takes place in the Sun is fusion reaction. Here 4 Hydrogen nuclii fuse together to form 1 Helium nucleus. The difference in mass between product and reactans is changed in from of heat and light. Or, In the Sun, light Hydrogen ( 1 1 ...

Silkworm produces silk in Pupa phase

Rate of reaction increases with increase in concentration of reactants. This implies that, rate of reaction is directly proportional to the concentration of reactants. Mathematically, Rate of reaction ∝ concentration of reactants

Properties of plastics Characteristics of plastics Light :- It is light in weight. Chemicaly inactive :- Water, moisture and air can't corrode plastics. Even it is not affected by various acids and other chemicals. Insulator :- Plastics are good insulator and bad conductor of both heat and electricity. Polymer :- Plastics are synthetic polymer.Plastics are long chain of repeated small organic molecules. Transparency :- A plastics comes transparecy rangees from a transparent object to an opaque object. Color :- Plastics are milky-white in color. various color pigments are used to give desirable color to plastics. Burning :- Plastics are long chain of carbon molecules. Upon burning they release toxic gase like carbon-monoxide(CO), Hydrogen chloride gas(HCl), Hydrogen Cynide gas(HCN) Mouldability :- Applyi...

Thermoplastics are also called thermosoftening plastics. These plastics can be mould to any shape after applying heat and pressure. Applications of thermoplastics are as follows:- It is used for making PPE(Personal protection equipment). It is used for making bags to wrap, pack or carry goods. It is also used as container for various item like medicine, cream, grocessary items etc It is used for making drinking bottles. It is used for making water poly tanks. It is used for making raincoats, motor vehicles coverings and canopy(Tripaal) It is used for making tape. It is used for making sack for rice, cement, flour, etc It is used for making brushes stem.

Thermosetting plastics can withstand high temperature. Applications of thermosetting plastics are as follows:- It is used for making plugs, switches and board. It is used for making hadles of kitchenware like cooker, pan, kettle, etc. Teflon is used for making coating of non-sticky cookwares. Bakelite is used for making components cabinates of various electronic devices like TV, radio, telephone, etc Teflon is also used for making cosmetic products like nail polish. Teflon is used in blades of hair straightners, trimmers blade etc Teflon is used for making anti-ageing products. Teflon is used as an insulator in aerospace and computer field.

Solution Input voltage, V₁ = 1200v. Let Number of turns in secondary coil C2 = N₂ Number of turns in secondary coil C1 = N₁ Output voltage = V₂. From question, 1 N₂ =     N₁ 5 N₂ 1      =      N₁ 5 From the transformer ratio, we have N₂ V₂      =      N₁ V₁ V₂ 1 Or,      =      V₁ 5 V₂ 1 Or,          =      1200 V 5  1  240 V Or, V₂ =       1200 V  5  ∴ V₂ = 240 V.  Hence the output voltage will be 240 V.  Laminated core dissipates less amount of heat than a single block of iron core would. Hence laminated core reduces core loss in transformer and incre...

 Medium   Weight  X 12 N Y 18 N Z 14 N Identify water, air and salt solution among X, Y and Z If the weight of 1kg mass in air is 10N, what will be the mass of the given stone? Find the upthrust experienced by the stone? Medium X is "salt solution", medium Y is "air" and medium Z is "water". Solution Given Weight of the stone in air = 18N 1 kg mass in air = 10N. 1N = 1 ÷ 10 kg = 0.1kg So, 18N = 18 × 0.1 kg = 1.8 kg ∴ Weight of the stone = 1.8 kg. Upthrust experienced by the stone in water = 18N - 14N = 4N Upthrust experienced by the stone in salt solution = 18N - 12N = 6N

The blood vessele given here is  "vein"  . Label Parts A Endothelium B Connective tissue C Smooth muscle D Valve

Properties of acid are:- Acid turns blue litmus paper into red . It tastes sour. Produces salt and water when reacted with base.

Manganese dioxide(MnO₂) accelerates the decomposition of Hydrogen Peroxide(H₂O₂) into water(H₂O) and Oxygen(O₂). 2H₂O₂ MnO₂             ➤ 2H₂O + O₂↑ Glycerine(C₃H₅(OH)₃) decelerates the decomposition of Hydrogen Peroxide(H₂O₂) into water(H₂O) and Oxygen(O₂). 2H₂O₂ Glycerine             ➤ 2H₂O + O₂↑

A - 1s 2 , 2s 2 2p 6 , 3s 2 B - 1s 2 , 2s 2 2p 6 , 3s 2 3p 5 Write the name of elements A and B. Write the balanced chemical equation of chemical reaction occurs between these two elements. Element A is Magnesium(Mg) and element B is Chlorine(Cl). Mg + 2Cl → MgCl₂

Following are the reasons that shows why country like Nepal should minimize consumption of mineral oil :- Nepal has hydropower potentiality of 83,000 MW. Nepal does not have any mineral oil source of its own. So it has to spen a lot of money to import mineral oils from abroad. To reduce net carbon emission by Nepal.

When we touch a hot body, we immediately move apart from that hot body. This action is instantaneous and automatic. Such action lies in reflex action category. here neuron plays an important role. Neuron's role here can be described in three terms. These terms are as follows :- Afferent nerve :- Neurons takes the sensory impulse from the receptor organ to the spinal cord. Relay neuron :- Neuron in spinal cord which changes the sensory impulse into motor impulse. Motor or Efferent Nerve :- Carries the motor impulse from the spinal cord to the effector organ so that receptor organ can be moved apart from the hot body.