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Units and Dimensions

135 Questions Start Allen Test
All Exams Allen Objective Errorless
Q1 Allen 1. UNITS MCQ
Which of the following system of units is not based on units of mass, length and time alone?
A.
SI
B.
MKS
C.
FPS
D.
CGS
Q2 Allen 1. UNITS MCQ
Which of the following is not a fundamental physical quantity?
A.
Mass
B.
Length
C.
Temperature
D.
Density
Q3 Allen 1. UNITS MCQ
Which of the following is not the name of a physical quantity :-
A.
kilogram
B.
impulse
C.
energy
D.
density
Q4 Allen 1. UNITS MCQ
Which of the following is not a unit of time?
A.
microsecond
B.
leap year
C.
lunar month
D.
light year
Q5 Allen 1. UNITS MCQ
Unit of energy in SI system is :-
A.
erg
B.
calorie
C.
joule
D.
electron volt
Q6 Allen 1. UNITS MCQ
In the SI system, the unit of temperature is :-
A.
Degree centrigrade
B.
Degree Celsius
C.
Kelvin
D.
Degree Fahrenheit
Q7 Allen 1. UNITS MCQ
The SI unit of momentum is :-
A.
$\frac{\mathrm{kg}}{\mathrm{m}}$
B.
$\frac{\mathrm{kg.m}}{\mathrm{sec}}$
C.
$\frac{\mathrm{kg.m}^2}{\mathrm{sec}}$
D.
$\mathrm{kg} \times \mathrm{newton}$
Q8 Allen 1. UNITS MCQ
SI unit of pressure is :-
A.
pascal
B.
Dyne/cm²
C.
cm of Hg
D.
atmosphere
Q9 Allen 1. UNITS MCQ
kg m/s² stand for the unit of :-
A.
Energy
B.
acceleration
C.
Force
D.
Momentum
Q10 Allen 1. UNITS MCQ
N kg $^{-1}$ is the unit of :-
A.
velocity
B.
energy
C.
acceleration
D.
force
Q11 Allen 1. UNITS MCQ
If the unit of length is micrometre and unit of time is microsecond, the unit of velocity will be :-
A.
100 m/s
B.
10 m/s
C.
micrometre/s
D.
m/s
Q12 Allen 1. UNITS MCQ
The unit of power is :-
A.
kilowatt
B.
kilowatt-hour
C.
dyne
D.
joule
Q13 Allen 1. UNITS MCQ
Kilowatt-hour is a unit of :-
A.
electrical charge
B.
energy
C.
power
D.
force
Q14 Allen 1. UNITS MCQ
One nanometer is equal to :-
A.
$10^{9}$ mm
B.
$10^{-6}$ cm
C.
$10^{-7}$ cm
D.
$10^{-9}$ cm
Q15 Allen 1. UNITS MCQ
The units nanometre, fermi, angstrom and attometre, arranged in decreasing order will read as :-
A.
angstrom, nanometre, fermi, attometre
B.
fermi, attometre, angstrom, nanometre
C.
nanometre, angstrom, fermi, attometre
D.
attometre, angstrom, fermi, nanometer
Q16 Allen 1. UNITS MCQ
Which is the correct unit for measuring nuclear radii:-
A.
micron
B.
millimetre
C.
agnstrom
D.
fermi
Q17 Allen 1. UNITS MCQ
Which of the following is usually a derived quantity?
A.
Mass
B.
Velocity
C.
Length
D.
Time
Q18 Allen 1. UNITS MCQ
Temperature can be expressed as a derived quantity in terms of which of the following?
A.
Length and mass
B.
Mass and time
C.
Length. mass and time
D.
None of these
Q19 Allen 1. UNITS MCQ
Which of the following sets can not enter into the list of fundamental quantities in any system of units?
A.
length, mass, velocity
B.
length, time, velocity
C.
length, time, mass
D.
mass, time, velocity
Q20 Allen 1. UNITS MCQ
The density of a liquid is 1000 kg m $^{-3}$ . Its value in CGS system :-
A.
1 gcm $^{-3}$
B.
0.1 gcm $^{-3}$
C.
10 gcm $^{-3}$
D.
100 gcm $^{-3}$
Q21 Allen 1. UNITS MCQ
The surface tension of a liquid is 70 dynes/cm. It may be expressed in M.K.S. system as:
A.
70 N/m
B.
$7 \times 10^{-2}$ N/m
C.
$7 \times 10^{2}$ N/m
D.
$7 \times 10^{3}$ N/m
Q22 Allen 1. UNITS MCQ
Units of length, velocity and force are doubled. Which of the following is correct:
A.
Units of time is doubled
B.
Unit of mass is doubled
C.
Unit of momentum is doubled
D.
Unit of energy is doubled
Q23 Allen 1. UNITS MCQ
If the units of length, velocity and force are half, then the units of Power will be :-
A.
doubled
B.
halved
C.
one fourth
D.
remains unaffected
Q24 Allen 2. DIMENSIONS MCQ
A dimensionless quantity
A.
Never has a unit
B.
Always has a unit
C.
May have a unit
D.
Does not exist
Q25 Allen 2. DIMENSIONS MCQ
A unitless quantity
A.
Does not exist
B.
Always has a nonzero dimension
C.
Never has a nonzero dimension
D.
May have a nonzero dimension