set 1 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on measurement and SI units topic of general science mcq
(a) CGS
(b) SI
(c) MKS
(d) FPS
The correct answers to the above question in:
Answer: (b)
1. CGS - centimetre-gram-seconds
The centimetre–gram–second system of units (abbreviated CGS or cgs) is a variant of the metric system based on the centimetre as the unit of length, the gram as the unit of mass, and the second as the unit of time.
2. SI - standard international system
S.I system (standard international system). In this system, the units of mass, length and time are the same, as that of the M.K.S system. However, it is an enlarged system encompassing all fundamental units.
3. MKS - metre-kilogramme-second
THE M.K.S. (metre-kilogramme-second) system of units is increasingly being. used by electrical engineers, particularly by those concerned with light-current and microwave work. The adoption of this system into the technical communications of physics and electrical engineering varies considerably.
4. FPS - foot-pound-second
The foot-pound-second (fps) system of units is a scheme for measuring dimensional and material quantities. The fundamental units are the foot for length, the pound for weight, and the second for time. The fps system has two variants, known as the American version and the Imperial version.
Discuss Form
Read more measurement and si units Based General Science Questions and Answers
Question : 1
The numerical ratio of displacement to the distance covered is always.
a) equal to or less than one
b) less than one
c) equal to one
d) equal to or greater than one
Answer »Answer: (a)
Since displacement is always less than or equal to distance but never greater than distance.
Hence, the numerical ratio of displacement to the distance covered is always equal to or less than one.
Question : 2
Which of the following is not a fundamental unit?
a) metre
b) newton
c) kilogram
d) second
Answer »Answer: (b)
Fundamental unit:
The SI unit of a fundamental quantity is called a fundamental unit.
There are 7 fundamental quantities and their fundamental units.
The fundamental quantities are Length, Mass, Time, Electric Current, Thermodynamic Temperature, Luminous Intensity, etc.
Fundamental Quantities | |
Quantities | S.I unit |
Mass | Kilogram (kg) |
Length | meter (m) |
Time | second (s) |
Amount of Substance | Mole (mol) |
Temperature | Kelvin (K) |
Electric Current | Ampere (A) |
Luminous intensity | Candela (cd) |
Also know,
Fundamental Quantity:
An independent physical quantity that cannot be expressed in terms of other physical quantities is called fundamental quantity.
They are conventionally chosen. It is used as a base to get other derived quantities by combining them.
Supplementary units:
The units that are used along with base units to form derived units in the International System are called supplementary units.
Supplementary Quantities | |
Plane angle | radian (rad) |
Solid angle | steradian (Sr) |
Derived Quantities | |
Force | Newton (N) |
Work | Joule (J), calorie |
Pressure | Pascal (Pa) |
Power | Watt (W) |
Explanation for the question:
meter (m), kilogram (Kg) and second (s) are the fundamental units of fundamental quantities Length, Mass and Time respectively.
Where Newton (N) is a Derived Quantities.
Question : 3
Assertion :
Density is a derived physical quantity.
Reason :
Density cannot be derived from the fundamental physical quantities.
a) If Assertion is correct but Reason is incorrect.
b) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
c) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
d) If Assertion is incorrect but Reason is correct.
Answer »Answer: (a)
Question : 4
Which one of the following is not a dimensionless quantity?
a) Frequency
b) Strain
c) Relative density
d) Angle
Answer »Answer: (a)
A dimensionless quantity (also known as a bare, pure, or scalar quantity as well as a quantity of dimension one).
It is a quantity to which no physical dimension is assigned, with a corresponding SI unit of measurement of one (or 1), which is not explicitly shown. Dimensionless quantities are widely used in many fields, such as mathematics, physics, chemistry, engineering, and economics. Dimensionless quantities are distinct from quantities that have associated dimensions, such as time (measured in seconds).
Dimensionless units are dimensionless values that serve as units of measurement for expressing other quantities, such as radians (rad) or steradians (sr) for plane angles and solid angles, respectively. For example, the optical extent is defined as having units of metres multiplied by steradians.
Question : 5
Light year is
a) the distance travelled by light in free space in one year
b) light emitted by the sun in one year
c) time taken by light to travel from sun to earth
d) time taken by earth to go once around the sun
Answer »Answer: (a)
A light-year, alternatively spelt lightyear, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometres (9.46×1012 km), or 5.88 trillion miles (5.88×1012 mi).
As defined by the International Astronomical Union (IAU), a light-year is a distance that light travels in a vacuum in one Julian year (365.25 days).
Because it includes the time-measurement word "year", the term light-year is sometimes misinterpreted as a unit of time.
The way to calculate the light-year distance is henceforth explained:
299792458 x 60 x 60 x 24 x 365.25
Where:
- 299 792 458 is the number of meters light travels in one second.
- 60 is the number of seconds in a minute.
- The other 60 is the number of minutes in an hour.
- 24 is the number of hours in a day.
- 365.25 is the number of days in a Julian year.
Question : 6
‘Light Year’ is
a) The time which Sun rays take to reach the Earth
b) The year in which February has 29 days
c) The distance travelled by light in one year
d) The time in which a spacecraft reaches Moon from the Earth
Answer »Answer: (c)
Light-year is the distance light travels in one year.
Light zips through interstellar space at 186,000 miles (300,000 kilometres) per second and 5.88 trillion miles (9.46 trillion kilometres) per year.
Verbal Reasoning
Question & Answer Quiz
Non Verbal Reasoning
Question & Answer Quiz
Quantitative Aptitude
Question & Answer Quiz
Computer MCQ
Question & Answer Quiz
General English
Question & Answer Quiz
History GK
Question & Answer Quiz
Polity GK
Question & Answer Quiz
Geography GK
Question & Answer Quiz
Economy GK
Question & Answer Quiz
General Awareness GK
Question & Answer Quiz
Recently Added Subject & Categories For All Competitive Exams
New 100+ Compound Interest MCQ with Answers PDF for IBPS
Compound Interest verbal ability questions and answers solutions with PDF for IBPS RRB PO. Aptitude Objective MCQ Practice Exercises all competitive exams
Continue Reading »
100+ Mixture and Alligation MCQ Questions PDF for IBPS
Most importantly Mixture and Alligation multiple choice questions and answers with PDF for IBPS RRB PO. Aptitude MCQ Practice Exercises all Bank Exams
Continue Reading »
IBPS Profit and Loss Questions Solved Problems with PDF
Most important Profit and Loss multiple choice questions and answers with PDF for IBPS RRB PO. 100+ Aptitude MCQ Practice Exercises all competitive exams
Continue Reading »
100+ Average Aptitude Questions Answers solutions MCQ PDF
New Average multiple choice questions and answers with PDF for IBPS RRB PO. 100+ Quantitative Aptitude MCQ Practice Exercises all competitive exams
Continue Reading »