C9 1.
Measurement
28. Name the instruments that are used for the measurement of volume of liquid.Ans: The instruments that are used to measure the volume of liquid are measuring cylinder, burette, pipette, volumetric flask etc.
29. How is the volume of an irregular body determined?Ans: The volume of an irregular body is determined by immersing the irregular object into a measuring cylinder by water displacement method.
30. Give the derived units of: a. Pressure b. Force c. powerAns: The derived units of:
1. Define physical quantity with examples.
Ans: Those quantities which can be measured directly or indirectly are called the physical quantities. Example: mass, volume, velocity, length, time, etc.
Ans: Those quantities which can be measured directly or indirectly are called the physical quantities. Example: mass, volume, velocity, length, time, etc.
2.
Write the types
of physical quantities.
Ans: There are two types of physical quantities, they are:
i) Fundamental physical quantity
ii) Derived physical quantity
Ans: There are two types of physical quantities, they are:
i) Fundamental physical quantity
ii) Derived physical quantity
3.
Define area and
volume.
Ans: Area is defined as the surface covered by an object and volume is the space occupied by an object.
Ans: Area is defined as the surface covered by an object and volume is the space occupied by an object.
4.
What do you
mean by fundamental physical quantity and derived physical quantity? Give
examples of each.
Ans: Those quantities which do not depend on other physical quantities are called the fundamental physical quantities. For e.g Length, mass, time, temperature, etc.
Those quantities which are derived from fundamental quantities or which depend on fundamental quantities are called the derived quantities. For e.g area, volume, speed, work,etc.
Ans: Those quantities which do not depend on other physical quantities are called the fundamental physical quantities. For e.g Length, mass, time, temperature, etc.
Those quantities which are derived from fundamental quantities or which depend on fundamental quantities are called the derived quantities. For e.g area, volume, speed, work,etc.
5.
Define
measurement and unit.
Ans: Measurement is the comparison of unknown quantity with the known quantity of same kind. A unit is a standard reference quantity with respect to which the other quantities are measured.
Ans: Measurement is the comparison of unknown quantity with the known quantity of same kind. A unit is a standard reference quantity with respect to which the other quantities are measured.
6.
What do you
mean by SI unit?
Ans: SI units are the standard units of measurement which is well accepted system of units all over the world and it is developed and extended form of MKS system.
Ans: SI units are the standard units of measurement which is well accepted system of units all over the world and it is developed and extended form of MKS system.
7.
Write the SI
units of mass, momentum, pressure, and frequency.
Ans: The SI units of mass is kilogram(kg), momentum is kilogram meters per second (kg⋅m/s), pressure is Pascal (Pa) and frequency is hertz (Hz).
Ans: The SI units of mass is kilogram(kg), momentum is kilogram meters per second (kg⋅m/s), pressure is Pascal (Pa) and frequency is hertz (Hz).
8.
What is the
importance of measurement?
Ans: The importance of measurement are:
i)It is essential for selling and buying goods.
ii)It is a must to perform scientific experiments.
iii)It is must to use medicine for proper treatment of diseases.
9. Define fundamental and derived quantities with two examples of each.
Ans: Those physical quantities,which do not depend upon other quantities are called fundamental quantities.Its two examples are:Length and mass.
Ans: The importance of measurement are:
i)It is essential for selling and buying goods.
ii)It is a must to perform scientific experiments.
iii)It is must to use medicine for proper treatment of diseases.
9. Define fundamental and derived quantities with two examples of each.
Ans: Those physical quantities,which do not depend upon other quantities are called fundamental quantities.Its two examples are:Length and mass.
Those physical quantities which are to be expressed in terms of other fundamental quantities are called derived quantities.Its two examples are:Area and acceleration.
10.
What is the
standard unit used to measure the mass?
Ans: The standard unit used to measure the mass is Kilogram (kg).
Ans: The standard unit used to measure the mass is Kilogram (kg).
11.
The unit of the
area is derived unit. Why?
Ans: The unit of area is derived unit because it is obtained by the product of two lengths.
Ans: The unit of area is derived unit because it is obtained by the product of two lengths.
12.
What are the
fundamental units are used in science?
Ans: The fundamental units used in science are: Kg, m, s, cd, A, mol, K
Ans: The fundamental units used in science are: Kg, m, s, cd, A, mol, K
13.
What is the SI
unit of current?
Ans: The SI unit of current is ampere (A).
Ans: The SI unit of current is ampere (A).
14.
Define : a.
Length b. mass c. time
Ans: a. Length: Length is defined as the distance between two points.
b. Mass: Mass is defined as the quantity of matter contained in a body.
c. Time: Time is defined as the duration between two events.
Ans: a. Length: Length is defined as the distance between two points.
b. Mass: Mass is defined as the quantity of matter contained in a body.
c. Time: Time is defined as the duration between two events.
15.
Write some
formula used to calculate the area of a regular object?
Ans: Some formula used to calculate the are of regular objects are:
Ans: Some formula used to calculate the are of regular objects are:
A= l×b, A = 1/2 b×h, A= l2 etc.
16.
Name the
fundamental units involved in the unit of force.
Ans: the fundamental units involved in the unit of force are: Kg, m and s.
Ans: the fundamental units involved in the unit of force are: Kg, m and s.
17.
Name the
fundamental units involved in: a. Newton b. Joule c.
Pascal d. Watt
Ans:
a. Newton: Kg, m, s-2
b. Joule: Kg, m2, s-2
c. Pascal: Kg, m-1, s-2
d. Watt: Kg, m2, s-3
Ans:
a. Newton: Kg, m, s-2
b. Joule: Kg, m2, s-2
c. Pascal: Kg, m-1, s-2
d. Watt: Kg, m2, s-3
18.
Distinguish
between fundamental and derived unit.
An: The differences between fundamental and derived units are:
An: The differences between fundamental and derived units are:
Fundamental units
|
Derived units
|
1. The units of fundamental quantities are called fundamental units
|
1. The units of derived quantities are called derived units.
|
2. These units are independent of each other.
|
2. These units are obtained one or more fundamental units i.e these depend upon each other.
|
3. Examples: second, kilogram, Kelvin, mole etc.
|
3. Examples: Joule, watt, Newton etc.
|
19.
Distinguish
between mass and weight.
Ans: The differences between mass and weight are:
S.no
|
Mass
|
Weight
|
1
|
It is the quantity of matter contained in a body.
|
It is the amount of force of gravity acted on a body.
|
2
|
Mass of an object does not vary from place to place
|
Weight of an object varies from place to place.
|
3
|
Mass is scalar quantity
|
Wight is the vector quantity.
|
4
|
Mass is measured by beam balance.
|
It is measured by spring balance.
|
5
|
There is no place or condition under which mass of an object be zero.
|
Weight of an object will be zero, at the centere of the earth or at the place where R = 0.
|
6
|
The SI unit of mass is kilogram(Kg).
|
The SI unit of weight is Newton(N).
|
20.
Distinguish
between density and relative density.
Ans: The differences between density and relative density are:
Density
|
Relative density
|
1. It is the mass per unit volume.
|
1. It is the ratio of density of a substance to the density of water at 4°C.
|
2. It can be expressed as: $D=\frac{m}{v}$
|
2. It can be expressed as:
 $R.D=\frac{\text{Density of substance}}{\text{density of water at 4}{}^\circ \text{C}}$ |
3. Its SI unit is kg/ m3.
|
3. It has no unit.
|
21.
Define: a. 1
Kg b. 1 m c. 1 s
Ans:
a. One kg: One standard kilogram is the mass of Platinum Iridium cylinder of length equal to height at the international bureau of weights and measures in France. This cylinder is about 4 cm height with a diameter of 4 cm.
b. One meter: One standard metre is the distance between two fine gold lines on Platinum-Iridium rod at 0°C, which is kept at international bureau of weight and measure in France.
c. One second: One standard second is the time taken by 9192631770 vibrations of the radiation emitted by Cesium - 133 atom.
22.
What is SI
system? Write the differences between SI system and CGS system.
Ans: Scientists all over the world realized the necessity of common system of units for the sake of uniformity and convenience. So, in 1960 AD, the eleventh general conference of scientists held on France recommended a common system of units. It is an extended form of metric system ie. MKS which is called SI system.
Ans: Scientists all over the world realized the necessity of common system of units for the sake of uniformity and convenience. So, in 1960 AD, the eleventh general conference of scientists held on France recommended a common system of units. It is an extended form of metric system ie. MKS which is called SI system.
CGS system is the French system of measurement. In this system, the unit of length is centimetre(cm), mass is gram(gm) and time is second (s).
23.
What is mass?
Write its SI unit.
Ans: Mass is the measure of the amount of matter contain in a body. Its SI unit is Kilogram (Kg).
Ans: Mass is the measure of the amount of matter contain in a body. Its SI unit is Kilogram (Kg).
24.
What do you
mean by physical quantity?
Ans: The quantity that can be measured directly or indirectly is called physical quantity. Examples: area, density, volume, pressure etc.
Ans: The quantity that can be measured directly or indirectly is called physical quantity. Examples: area, density, volume, pressure etc.
25.
What is
density? Define relative density.
Ans: Density:
Ans: Density:
Density is defined as the mass per unit volume. Its is scalar quantity. Its SI unit is kg / m3. Mathematically,
Density $D=\frac{M}{V}$
Relative density:
Relative density is defined as the ratio of density of a substance to the density of water at 4°C.
Mathematically,
Relative density \[\text{R}\text{.D}=\frac{\text{Density of substance}}{\text{Density of water at 4 }\!\!{}^\circ\!\!\text{ C}}\]
Relative density has no unit because it the ratio between two densities.
26.
Define: FPS
system b. MKS system c. SI system d. CGS system
Ans:
27. Define a light year. What quantity does it measure? Ans: Light year is the distance traveled by light in one year. It is used to measure the large distances such as distance between two planets, tow stars etc. One light year equal to 9.46×10^15 meter.Ans:
a. FPS system: It is the British system of unit. In this system, the unit of length, mass and time are foot (ft), pound (lb) and second (s) respectively.
b. MKS system: In this system the units of the length, mass and time are meter (m), kilogram (kg) and second (s) respectively. In our country Nepal, M.K.S system is used as the standard for measuring physical quantities.
c. SI system: Scientists all over the world realized the necessity of common system of units for the sake of uniformity and convenience. So, in 1960 AD, the eleventh general conference of scientists held on France recommended a common system of units. It is an extended form of metric system (MKS). This conference defined various quantities and ready to provide sample of defined quantities to every-nation. Thus, it provides the uniformity on measurement.
d. CGS system: It is the French system of unit. In this system, the unit of length is centimetre (cm) that of mass is gram (gm) and time is second (s).
28. Name the instruments that are used for the measurement of volume of liquid.Ans: The instruments that are used to measure the volume of liquid are measuring cylinder, burette, pipette, volumetric flask etc.
29. How is the volume of an irregular body determined?Ans: The volume of an irregular body is determined by immersing the irregular object into a measuring cylinder by water displacement method.
30. Give the derived units of: a. Pressure b. Force c. powerAns: The derived units of:
a. Pressure: $\frac{Kg}{m{{s}^{2}}}$
b. Force: $\frac{Kgm}{{{s}^{2}}}$
c. Power: $\frac{Kg{{m}^{2}}}{{{s}^{2}}}$
31. Define SI units. What are the other basic units involved in it?Ans: Scientists all over the world realized the necessity of common system of units for the sake of uniformity and convenience. So, in 1960 AD, the eleventh general conference of scientists held on France recommended a common system of units. It is an extended form of metric system (MKS).
The other basic units involved in it are: Amount of substance (mol), Electric current (A), Luminous intensity (cd), and Temperature (K).
32. Name the physical quantities for the which the following units: a. light year
b. Force: $\frac{Kgm}{{{s}^{2}}}$
c. Power: $\frac{Kg{{m}^{2}}}{{{s}^{2}}}$
31. Define SI units. What are the other basic units involved in it?Ans: Scientists all over the world realized the necessity of common system of units for the sake of uniformity and convenience. So, in 1960 AD, the eleventh general conference of scientists held on France recommended a common system of units. It is an extended form of metric system (MKS).
The other basic units involved in it are: Amount of substance (mol), Electric current (A), Luminous intensity (cd), and Temperature (K).
32. Name the physical quantities for the which the following units: a. light year
b. Luminous intensity
c. Wavelength
d. cubic meter
e. Ampere f. mol
Ans:
a. Light year: Distance
b. Luminous intensity: Light
c. Wavelength: Distance
d. Cubic meter: Volume
e. Ampere: Electric current
f. Mol: Amount of substance
33. The weights and meter scales in the market are checked by Department of Standard weights and Measurement in Nepal once in every two years. Why?Ans: The weights and meter scales when used regularly for long time erode. Due to this, there is possibility of giving false reading or measurement. So, these should be checked periodically and a calibrated with standard measurement kept at Metrology Department.
e. Ampere f. mol
Ans:
a. Light year: Distance
b. Luminous intensity: Light
c. Wavelength: Distance
d. Cubic meter: Volume
e. Ampere: Electric current
f. Mol: Amount of substance
33. The weights and meter scales in the market are checked by Department of Standard weights and Measurement in Nepal once in every two years. Why?Ans: The weights and meter scales when used regularly for long time erode. Due to this, there is possibility of giving false reading or measurement. So, these should be checked periodically and a calibrated with standard measurement kept at Metrology Department.
Posts
Q.no.1 Namrata Tamang: The quantity which can be measured directly and Indirectly and can easily be found in our surrounding is known as physical quantity. Some of its examples are: Mass,Time,Length etc.
ReplyDeleteCorrect
ReplyDeleteQ.no.2 Namrata Tamang: There are two types of physical quantities, they are:
ReplyDeletei) Fundamental physical quantity
ii) Derived physical quantity
Q.no.1 Shreya Poudel:Those quantities which can be measured directly or indirectly are called the physical quantities. Example:mass,volume, velocity,length, time, etc.
ReplyDeleteQ.no.4 Shreya Poudel: Those quantities which do not depend on other physical quantities are called the fundamental quantities. For eg:Length,mass,time,temperature,etc.
ReplyDeleteThose quantities which are derived from fundamental quantities or which depend on fundamental quantities are called the derived quantities. For eg: area,volume,speed,work,etc.
Q.no.5 Roshika Thapa:Measurement is the comparison of unknown quantity with the known quantity of same kind.
ReplyDeleteA unit is a referencestndard quantity with respect to which the other quantities are measured.
Q.no.14 Roshika Thapa:Length is the distance between two points.
ReplyDeleteMass is the matter contained in a body.
Time is the interval between two events.
Q.no.6 Roshan Acharya: SI units are the standard units of measurement which is well accepted system of units all over the world and it is developed and extended form of MKS system.
ReplyDeleteQ.no.7 Roshan Acharya:The SI units 0f mass is kilogram(kg),momentum is kilogram meters per second(kg⋅m/s),pressure is Pascal(Pa) and frequency is hertz(Hz).
ReplyDeleteQ.no.8 Shreya Poudel:The importance of measurement are:
ReplyDeletei)It is essential for selling and buying goods.
ii)It is a must to perform scientific experiments.
iii)It is must to use medicine for proper treatment of diseases.
Q.no.9 Shreya Poudel:Those physical quantities,which do not depend upon other quantities are called fundamental quantities.Its two examples are:Length and mass.
ReplyDeleteThose physical quantities which are to be expressed in terms of other fundamental quantities are called derived quantities.Its two examples are:Area and acceleration.
Q.no.10.Namrata Tamang: The standard unit used to measure the mass is Kilogram (kg).
ReplyDeleteQ.no.13.Namrata Tamang: The SI unit of current is ampere (A).
ReplyDeleteQ.no.23. Namrata Tamang: Mass is the measure of the amount of matter in an object. Its SI unit is Kilogram (Kg).
ReplyDeleteQ.no.24 Roshika Thapa:The quantity which can be measured directly or indirectly is called physical quantity.
ReplyDeleteQ.no.24 Roshan Acharya:The mass of a unit volume of a substance is called its density.
ReplyDeleteRelative density is the ratio of the density of a substance to the density of a given reference material.
Q.no.25
ReplyDeleteQ.no.26 Roshika Thapa:FPS system:The system in which length is measured in foot(ft), mass in pound (lbs) and time in second (s) is called FPS system.
ReplyDeleteMKS system:The system in which length is measured in metre(m), mass in kilogram (kg)and time in second (s) is called MKS system.
SI system:The system which is the improved and extended version of MKS system of units and which is internationally accepted system of units is called SI system.
CGS system:The system in which length is measured in centimetre (cm), mass in gram (g), time in second (s) is called CGS system.
Q.no.28 Roshika Thapa:The instruments that are used for the measurement of volume of liquid are:Various measuring vessels such as measuring cylinder, measuring can, pipette,burette, volumetric flask, etc.
ReplyDeleteQ.no.29 Shreya Poudel:The volume of an irregular body is determined by using measuring cylinder.This method is based on the fact that the volume of an irregular solid is equal to the volume of water displaced by it when it is immersed in water.The volume of displaced water is equal to the volume of an irregular body that displace water.
ReplyDeleteQ.no.18 Roshika Thapa:The differences between fundamental and derived unit are:
ReplyDeleteS.no Fundamental S.no Derived unit
Unit
1 It is a unit 1 It is a unit
which is indep- which depends
endent on other on two or more
units. basic units.
2 It cannot be 2 It can be expr-
resolved into essed in terms
simpler units. of power of
fundamental
units.
3 Metre,second, 3 Units of area
kg,kelvin,etc such as veloci-
are basic units. ty,joule,etc
are derived
units.
Q.no.29 Shreya Poudel:The volume of an irregular body is determined by using measuring cylinder.This method is based on the fact that the volume of an irregular solid is equal to the volume of water displaced by it when it is immersed in water.
ReplyDelete