NOUN iLearn Past Questions and Answers

DISCLAIMER: FOR EXAM PREPARATION & REVISION PURPOSES ONLY, NOT TO BE TAKEN INTO THE EXAM HALL

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 $pi=22/7$

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 _____________.

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

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 __________.

In an experiment, measurements of variables were repeated in order to minimize ____________

PHY 191 GENERAL PHYSICS PRACTICAL

NATIONAL OPEN UNIVERSITY OF NIGERIA

E-Examinations

DISCLAIMER: FOR EXAM PREPARATION & REVISION PURPOSES ONLY, NOT TO BE TAKEN INTO THE EXAM HALL

## PHY191_PRACTICE_SET1

Question 1In 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 __________.

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

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

__________________ 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 ___________

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

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 _______________.

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 ______________

The sum of the measurements 2.11m, 2.1546m and 2.125m may be rounded off as ______________

**ANS: 6.39m**

Question 12

Errors that might result in measured values which are consistently too high or too low are called __________ errors

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

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.

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

$T=\pi\sqrt(\frac{(H-h)}{g}))$, 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

The simple pendulum experiment is used to determine an inaccessible height H using the relation

$T=\pi\sqrt(\frac{(H-h)}{g}))$, 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 1In 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

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

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

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 non-zero

digits are ____________

When writing the results of an experimental observation in terms of significant digits, all non-zero

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

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**

Question 7

A quantity to be measured as __________ value is independent of the process of measurement

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

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 ______________

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 ___________

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

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

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

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

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 _______________________

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**

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