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) metre
(b) newton
(c) kilogram
(d) second
The correct answers to the above question in:
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.
Discuss Form
Read more measurement and si units Based General Science Questions and Answers
Question : 1
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 : 2
A stone is thrown vertically upwards with an initial velocity u from the top of a tower of height g ${12u^2}/g$ . With what velocity does the stone reach the ground ?
a) 5u
b) u
c) 4u
d) 2$√{6}$u
Answer »Answer: (a)
As already We know that, when a particle is thrown vertically upward with a velocity u from a point A, the particle returns the point A with the same velocity u.
Now, using the fact $v^2=u^2+2gh$, we obtain $v^2=u^2+2g × {12u^2}/{g} ⇒ v^2 = u^2+24u^2$
⇒ v = 5u
Question : 3
Which one of the following is not correctly matched?
a) Nautical miles - Unit of naval distance
b) Decibel - Unit of sound intensity
c) Horsepower - Unit of power
d) Celsius - Unit of heat
Answer »Answer: (d)
Celsius - Unit of Temperature.
Some more examples,
SI Unit | Other Units | |
Temperature | Kelvin (K) | Celsius (°C), Fahrenheit (°F) |
Heat | Joule (J) | Calorie, British Thermal Unit (BTU) |
Sound | Decibel (dB) | |
Distance | Meter (m) | Yard, Kilometer, Nautical mile, Mile |
Power | Watt (W) or Joule per sec | Ergs/sec, Horsepower (hp) |
Question : 4
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 : 5
Which of the following systems of units is not based on units of mass, length and time alone?
a) CGS
b) SI
c) MKS
d) FPS
Answer »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.
Question : 6
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.
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