21.
The atomic, molecular and nuclear phenomena are the parts of ..............domain.
A
macroscopic
B
microscopic
C
megascopic
D
electroscopic
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The atomic, molecular and nuclear phenomena are the parts of ..............domain.
macroscopic
microscopic
megascopic
electroscopic
Temperature can be expressed as a derived quantity in terms of
length and mass
mass and time
length, mass and time
none of these
State the number of significant figures in6.032 J
4
3
2
1
Significant figures depends upon the ..............of the measuring instrument.
length
readings
number
accuracy
S.I system of unit contains ..............supplementary unit.
7
2
many
4
Out of the following units, which is NOT a fundamental unit?
newton
second
pound
kg
Nano size of gold has ..............colour.
yellow
red
pink
orange
Maxwells equations relate to
laws of electrostatics
nuclear model of an atom
law of gravitation
basic laws of electromagnetism
Light year is a unit for the measurement of
temperature
luminous intensity
distance
time
Instrumental error can be minimised by
adjusting zero of the instrument.
maintaining the temperature of the surrounding.
taking large number of readings.
using different accurate instrument for the same reading.
In which of following system, scientific data can be exchanged between different parts of the world?
F.P.S.
S.I
M.K.S.
C.G.S.
In cesium atomic clock ..............is used.
cesium-133 atom
cesium-134 atom
cesium-122 atom
cesium-132 atom
If the pointer of the voltmeter is not exactly at the zero of the scale then the error is called
personal error
random error
instrumental error
systematic error
Error due to non-removal of parallax between pointer and its image in case of magnetic compass needle causes
personal error
random error
instrumental error
persistant error
Dimensional equation CANNOT be used
to find out constant of proportionality which may be pure number.
to change from one system of units toanother system.
to check the correctness of a physical quantity.
to derive the relation between different physical quantities.
Constant error can be caused due to
lack of concentration of observer.
wrong procedure of handling the instrument
faulty construction of instrument.
wrong setting of instrument.
Checking the correctness of physical equations using the method of dimensions is based on
the method of measurement.
principle of homogeneity of dimensions.
equality of inertial frame of reference.
the type of system of units.
Accidental error can be minimised by
selecting instrument with greater least count.
selecting instrument with small least count.
taking only one reading.
taking small magnitude of the quantity.
A unitless quantity
never has a zero dimension.
has no dimensions.
always has a non-zero dimension.
may have a non-zero dimension.
A set of fundamental and derived units is known as
complementary units
metric units
supplementary units
system of units