# PHY191: NOUN 2020 TMA 1 Questions And Answers (First Semester)

Answers to the questions are all  highlighted yellow and in bold format.

PHY191 TMA 1 QUESTION AND ANSWERS

Q1. Express 0.0450312 in 3 significant figures
a) 0.0450312
b) 0.045
c) 0.05
d) 0.04503

Q2. Periodic time of a simple pendulum depends on
a)  None of the above
b) The mass of the pendulum bob
c)  The collective mass of the pendulum bob and thread
d) The length of the pendulum

Q3.  The error that may be present when varying values of time are obtained 30 times for a rolling metal cylinder down an inclined plane between two fixed points on the plane using a stop-watch is
a)  Instrumental error
b)  Systematic error
c) Random error
d)  Erratic error

Q4. Errors arising from various individual judgements in estimating scales, fluctuating conditions in temperature, pressure, voltage measurements and inhomogeneity of material measured are
a) Â Â  Variable errors
b) Erratic errors
c) Systematic errors
d) Random errors

Q5. Errors which affect measurements in a regular way or in some constant proportion such as instrument errors arising from faulty instruments are
a) Random errors
b) Erratic errors
c) Â Â  Variable errors
d) Systematic errors

Q6. A straight line graph equation of the form y = mx will always have plotted points
a) passing through the horizontal axis
b) None of the above
c) passing through the origin
d) passing through the vertical axis passing through the horizontal axis

Q7. A straight line graph equation of the form y = mx has a
a) negative slope
b) positive slope
c) positive intercept
d) negative intercept

Q8. Errors arising from arithmetic miscounting a number of periods, faulty electrical contacts, wrong  scale reading are
a) Random errors
b) Erratic errors
c) Maximum errors
d) Systematic errors

Q9. Metal cylinder was rolled down 30 times from an inclined plane between two fixed points on the plane using a stop-watch, if the stop-watch is working fine, but varying values of descent are still being observed, then it is likely due to
a) Random error
b) Erratic error
c) Instrumental error
d) Systematic error

Q10. In testing for errors in a set of data, if the difference between the Experimental value (mean of the set of data) and the theoretical value is greater than three times the standard error, it may be an indication of
a) Erratic error
b) Random error
c) Systematic error
d) Regular error

Source: Nounspy