Post Utme Physics Past Questions and Answers

Question 836:

A galvanometer of internal resistance $50\mathrm{\Omega }$ has a full-scale deflection for a current of $5\mathrm{mA}$. What is the resistance required to convert it to a voltmeter with full scale deflection of $10\mathrm{V}$ ?

A. $1750\mathrm{\Omega }$
B. $1950\mathrm{\Omega }$
C. $2000\mathrm{\Omega }$
D. $2500\mathrm{\Omega }$

Question 837:

The cost of running five $60\mathrm{W}$ lamps and four $100\mathrm{W}$ lamps for 20 hours if electrical energy costs $\mathrm{N}10.00$ per KWh is ____________

A. N 280.00
B. N160.00
C. N120.00
D. N 140.00

Question 838:

From the generating station to each substation, power is transmitted at a very high voltage so as to reduce ____________

A. Eddy current loss
B. Hysteresis loss
C. Heating in the coll
D. Magnetic flux leakage

Question 839:

The relationship between the length( $L$ of air column in a pipe open at one end and the wavelength $(\lambda )$ of the standing wave at the first overtone is ____________

A. $2\mathrm{L}=\lambda$
B. $L=\lambda$
C. $L=3\lambda$
D. $4\mathrm{L}=3\lambda$

Question 840:

If the angle of declination in a place is ${10}^{\circ }\mathrm{E}$, calculate the true geographic bearing if the compass reads $N{40}^{\circ }\mathrm{E}$.

A. $\mathrm{N}{50}^{\circ }\mathrm{E}$
B. $N{40}^{\circ }\mathrm{E}$
C. $\mathrm{N}{30}^{\circ }\mathrm{E}$
D. $\mathrm{N}{25}^{\circ }\mathrm{E}$