PHY191 NOUN iLearn Questions and Answers
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PHY191_PRACTICE_SET1
Question 1
In an experiment to determine the value of g using
simple pendulum, $T^2$ was plotted on the ordinate
(vertical axis) and l on the abscissa (horizontal axis),
where T and l are the period and length of the
pendulum respectively. The value of g was determined
to be $9.72ms^2$.The value of the slope s to 2
decimal places was _________. Take $pi=22/7$
ANS: 4.06s^{2}m{1}
Question 2
The equation $x=at^b$ is suggested for the variation of
two quantities x and t where a and b are constants.
The corresponding equation of a straight line graph
that may be plotted from experimental values of x and
t is _____________.
ANS: logx=loga+blogt
Question 3
In an experiment to verify Boyle's law the P (pressure)
was plotted against _________ of the volume V to
obtain a linear graph that passes through the origin
ANS: Reciprocal
Question 4
The current I passing through a silicon diode is related
to potential difference V across it by I=Ioexp(eV/2kT),
where Io is a constant, e the electronic charge, k the
Boltzmann's constant and T the absolute temperature.
lnI was experimentally plotted against V at a given
value of T. The slope of the graph is __________.
ANS: e/2kt
Question 5
The maximum possible error in the measurement of
length using the metre scale is __________.
ANS: 0.05
Question 6
A smaller measurement is more ____________ for the
same accuracy
ANS: Precise
Question 7
__________________ is the more accurate between
the measurements 40.0 cm and 8.0 cm of length
ANS: 40.0
Question 8
A number N is written as $N=Ax10^{p}$, where A is a
number between 1 and 10 and p is an integer. In this
form N is said to be expressed in ___________
ANS: Scientific notation
Question 9
In recording measured values, a digit is significant if
and only if it affects the _____________ of the
measurement
ANS: Relative error
Question 10
The product of two measurements 1.23cm and 2.3cm
should be rounded off as _______________.
ANS: 2.8cm
Question 11
The sum of the measurements 2.11m, 2.1546m and
2.125m may be rounded off as ______________
ANS: 6.39m
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Question 12
Errors that might result in measured values which are
consistently too high or too low are called __________
errors
ANS: Systematic
Question 13
The precision index for the set of data
3.69,3.67,3.68,3.69,3.68,3.69,3.66,3.67 is
_________________ to 3 decimal places
ANS: 0.003
Question 14
The displacement s of a trolley as a function of time is
given as $s+ds=0.63\pm0.02$ for
$t+dt=1.71pm0.10$s.The error dv in the measurement
of velocity v is ______ to 2 decimal places.
ANS: 0.02ms^{1}
Question 15
The simple pendulum experiment is used to determine
an inaccessible height H using the relation
$T=\pi\sqrt(\frac{(Hh)}{g}))$, where h is the height of
the bob from the floor. The inaccessible height is
obtainable from the _______ of the graph of $T^{2}$
plotted against h
ANS: Intercept on the h axis
PHY191_PRACTICE_SET2
Question 1
In an experiment, measurements of variables were
repeated in order to minimize ____________
ANS: Random
Question 2
A mass of 150g when hung on a spiral spring stretches
it 40cm. Assuming the spring is Hookean, the period of
oscillation of the mass when slightly displaced and
released is _____ to 2 decimal places
ANS: 1.27s
Question 3
A wooden block is at the verge of sliding freely down a
wooden inclined plane when the inclination is
20degrees. The coefficient of limiting friction is
_______ to 2 decimal places
ANS: 0.36
Question 4
The resulting temperature when 1kg of ice at 0
degrees Celsius is mixed with 9kg of water at 50
degrees Celsius is _________ to the nearest whole
number. The specific capacity of water is 4200J/kg/K,
the specific latent heat of fusion of ice is 330 000J/kg
ANS: 37 degrees celsius
Question 5
When writing the results of an experimental
observation in terms of significant digits, all nonzero
digits are ____________
ANS: Significant
Question 6
An experiment which gives a straight line graph with
positive intercepts on both axes of the graph has a An
experiment which gives a straight line graph with
positive intercepts on both axes of the graph has
a________ slope
ANS: Negative
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Question 7
A quantity to be measured as __________ value is
independent of the process of measurement
ANS: True
Question 8
The slope of a graph is obtained from a suitable
________ of slope drawn on the graph
ANS: Triangle
Question 9
The slope of the tangent to a curve which is parallel to
the horizontal axis of the graph is ______________
ANS: Zero
Question 10
A straight line joining most of the plotted points with
the rest of the plotted points on either sides of the line
is called line of ___________
ANS: Best fit
Question 11
In a simple pendulum experiment, $T^{2} (s^{2})$ is
plotted on the vertical axis while ____________ is
plotted on the horizontal axis
ANS: l/cm
Question 12
To obtain a suitable spread of the plotted points on the
graphed paper, a suitable ____________ must be
chosen for each axis of the graph
ANS: Scale
Question 13
In simple harmonic motion, the restoring force F obeys
_______________'s law for small displacements from
equilibrium position
ANS: Hooke
Question 14
The motion of a simple harmonic oscillator is such that
the acceleration is in _______________ direction to
the displacement from equilibrium position
ANS: Opposite
Question 15
The equation of a simple harmonic oscillator takes the
form $a ={} \omega^{2}$x. The symbols have their
usual. The equivalent of $\omega^{2}$ in the case of a
simple pendulum is _______________________
ANS: g/l
PHY191_PRACTICE_SET3
Question 1
For a loaded spiral spring, provided the ____________
of the spring is not exceeded, we write, F = kx, where
the symbols have the usual meaning.
ANS: Elastic limit
Question 2
In an experiment to determine the surface tension of
water by the capillary rise method, the instrument
called __________________ is used to measure the
capillary rise
ANS: Travelling microscope
Question 3
In an experiment to verify Boyle's law, a student
plotted P against V. His graph is a ________________
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ANS: Hyperbola
Question 4
The temperature at which, theoretically all thermal
motions will cease is called _____________
temperature
ANS: Absolute zero
Question 5
In an experiment to determine the specific heat of
fusion of ice the calorimeter must be ______________
to prevent loss of heat to the surrounding
ANS: Lagged
Question 6
In all experiments involving the method of mixtures
(calorimetry), uniform temperature of the mixture is
maintained by continually and gently ____________ it.
ANS: Stirring
Question 7
To determine the coefficient of friction between two
surfaces we can place a block of material such as wood
on an __________ and gradually increase its angle
until the block just begins to slide
ANS: Inclined plane
Question 8
The coefficient of friction between two surfaces is
defined the ratio of the frictional force to ___________
to the surfaces
ANS: The normal reaction
Question 9
An experiment was performed to determine the
coefficient of friction using the scale pan or slotweights
method. A graph of the tension T in the string
connecting the block on a bench and passing over a
pulley to a freely hanging pan or slotweighs was
plotted against the weight W of the block. The slope
$\frac{\Delta{T}}{\Delta{W}}$ gives the ________
ANS: Coefficient of friction
Question 10
Relative density of a liquid or granular substance not
soluble in water can be experimentally determined
using an apparatus known as relative density or
_________ bottle
ANS: Specific gravity
Question 11
In practical physics it advisable to display your
observation data in an allinclusive table known as
____________ table
ANS: Observation
Question 12
In general, a device used for measuring mass in the
laboratory is called ___________________
ANS: A balance
Question 13
In experiments involving oscillations, the number of
complete oscillations per unit time is the ___________
of the oscillation
ANS: Frequency
Question 14
If n complete oscillations are made in t seconds, then
the period T of oscillation is given as T=___________ s.
ANS: t/n
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Question 15
The inverse of the period of oscillation is the same as
its ________________________
ANS: Frequency
PHY191_PRACTICE_SET4
Question 1
The maximum displacement of an oscillating system
from its equilibrium position is referred to as its
__________
ANS: Amplitude
Question 2
The statement "the upthrust experienced by an object
that is wholly or partially immersed in a fluid is equal
to the weight of the liquid displaced" is the _________
principle
ANS: Archimedes
Question 3
In the laboratory, the device usually used for
measuring the diameter of a piece of wire is called
_____________
ANS: Micrometer screw gauge
Question 4
The instrument usually used for measuring the internal
diameter of a testtube in the laboratory is
ANS: Vernier calipers
Question 5
In an experiment, the function $y={}ax{^2} +bx+c$,
where a, b and c are constant, was plotted with y on
the vertical axis and x on the horizontal axis. At
maximum point on the graph, the tangent to the curve
to the xaxis?
ANS: Parallel
Question 6
The gradient of the tangent to a cooling curve
(temperature versus time curve as a substance cools) is
__________________
ANS: Negative
Question 7
If the tangent to a curve at a point is parallel to the
horizontal axis, then the gradient of the curve at that
point is _______________
ANS: Zero
Question 8
The error in the measurement of a physical quantity
due to wear and of the measuring instrument is called
______________ error
ANS: Back lash error
Question 9
The weight of the column of liquid in a capillary tube is
supported by the upward ___________ force
ANS: Surface tension
Question 10
In the equation $Q = mc\theta$, where Q is the
amount of heat energy, m the mass of substance and
$\theta$ the change in temperature, c refers to
______________ of the substance.
ANS: Specific heat capacity
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Question 11
The method of mixtures as a means of measuring
specific heat capacity and latent heat is based on the
principle of _____________ of energy
ANS: Conservation
Question 12
In an experiment involving a loaded helical spring, the
relationship $T = 2\pi\sqrt{\frac{(M+m)}{k}}$, was
suggested as the relationship between the period T,
the loaded mass M and the effective mass of the spring
m. If $T^{2}/s{2}$ was plotted on the vertical axis
against M/kg on the horizontal axis, the graph should
have an __________ on the vertical axis.
ANS: Intercept
Question 13
In an experiment involving a loaded helical spring, the
relationship $T = 2\pi\sqrt{\frac{(M+m)}{k}}$, was
suggested as the relationship between the period T,
the loaded mass M and the effective mass of the spring
m. If $T^{2}/s{2}$ was plotted on the vertical axis
against M/kg on the horizontal axis, the effective mass
of the system would be the __________ on the
horizontal axis.
ANS: Intercept
Question 14
In an experiment, the relationship between frictional
force f and normal reaction R was given $f=\mu{R}.
$\mu$ is the ______________ of the graph of f versus
R
ANS: Slope
Question 15
$\frac{Density of the liquid}{Density of water}$ =
_______________ of the liquid
ANS: Relative density
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Past Questions: PHY191  Introductory Practical Physics I
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