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Delhi Police Constable Exam Model Paper 8
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© examsnet.com
Question : 12
Total: 100
What is the unit of acceleration?
cm/s
km/h
m
s
2
m
2
s
Validate
Solution:
The correct answer is
m
s
2
.
Acceleration
: It is the
rate of change of velocity
with time.
The average acceleration over a time interval is represented by the formula -
−
a
=
v
2
v
1
t
2
−
t
1
=
Δ
v
Δ
t
Where
v
2
and
v
1
are the instantaneous velocities or simply velocities at time
t
2
and
t
1
●
Types of Units -
Fundamental units -
Fundamental Physical quantity
Fundamental Unit
Symbol
Length
metre
m
Mass
kilogram
kg
Time
second
s
Electric current
ampere
A
Temperature
kelvin
k
Luminous intensity
candela
cd
Amount of substance
mole
mol
Sound
decibel
DB
●
Derived units:
It is obtained by the combination of one or more fundamental units.
Derived Physical quantity
Derived Unit
Area
m^ 2
Volume
m^3
Density
kg/ m^ 3
Speed
m/s
Acceleration
m/ s^2
Momentum
kg m/ s
Force
kg m/ s^2
or newton
Work
kg m ^2
s^
2
or joule
Power
kg m2
/ s3
or watt
Charge
ampere-sec or coulomb
Potential
joule/coulomb or volt
Resistance
volt/ampere or ohm
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