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WorksheetsNature of Physical World and Measurement
Total questions: 25
Worksheet time: 9mins
How many numbers of base SI units are there?
5
10
7
9
What is the percentage error in the measurement of the kinetic energy of a body, if there is a positive error of 50% in the speed of the body
125 %
30 %
50 %
100 %
What is the dimensional formula of torque?
[ML-3T-2]
[ML2T-2]
[ML2T-2]
[MLT2]
Find the relative error of y, if y=x2
xΔx
x2Δx
Δx2
Δx2 / x
Which the following is a dimensionless quantity
Refractive index
Gravitational constant
Velocity
Planck’s constant
One of the combinations from the fundamental physical constants is hc/G .
The unit of this expression is
kg 2
m3
s-1
m
If the error in the measurement of radius is 2%, then the error in the determination of volume of the sphere will be
8%
2%
4%
6%
Which of the following has the highest number of significant figures?
0.007 m2
2.64x1024 kg
0.0006032 m2
6.3200 J
If π = 3.14, then the value of π2 is
9.8596
9.860
9.86
9.9
Which of the following pairs of physical quantities have same dimension?
force and power
torque and energy
torque and power
force and torque
The dimensional formula of Planck's constant h is
[ML2T-1]
[ML2T-3]
[MLT-1]
[ML3T-3]
The velocity of a particle v at an instant t is given by v=at+bt2. The dimensions of b is
[L]
[LT-1]
[LT-2]
[LT-3]
The density of a material in CGS system of units is 4 g cm-3 . In a system of units in which unit of length is 10 cm and unit of mass is 100 g, then the value of density of material will be
0.04
0.4
40
400
Two quantities are given in which one of which is a vector and another one is a scalar having the same dimensional formula are:
Work and energy
Torque and work
Impulse and momentum
Power and pressure
Which of the following is not the unit of time:
Microsecond
Leap year
Lunar months
Parallactic second
Which of the following the smallest unit:
Millimeter
Angstrom
Fermi
Metre
Zero error of an instrument introduces:
Systematic error
Random error
Both
None
The sides of a rectangle are 6.01 m and 12 m. Taking the significant figures into account, the area of the rectangle is
72 m2
72.1 m2
72.00 m2
72.12 m2
The value of 0.99 – 0.989 is
0.001
0.010x10-1
0.01x10-1
0.1x10-3
With due regard for significant figures, (12.5)2 =
156.250
156.25
156.2
156
The number of significant figures in 600 m is
1
2
3
4
The number of significant figures in 0.00040 m is
1
2
3
4
The vernier of a circular scale is divided into 30 divisions which coincides against 29 main scale divisions. Each main scale divisions is 1/20 The least count of the instrument is
30'
10'
1'
0.1'
The ratio of the height of a man to the radius of the earth is of the order of
10-9
10-7
10-5
10-3
Which of the following quantities is expressed as force per unit area?
Work
Area
Volume
Pressure
