Post Utme Physics Past Questions and Answers

Question 1241:

Which of the following is not a thermometer?

A. Thermocouple
B. Pyrometer
C. Hydrometer
D. Platinum resistance thermometer

Question 1242:

Dry air of column length \(10 cm\) is trapped by a pellet mercury of length \(15 cm\), with the open cnd uppermost. When the capillary tube is inverted the length of the air column increased to \(25 cm\) while that of mercury remained constant. Calculate the atmospheric pressure (in \(cm\) of \(Hg\) )

A. \(35 cmHg\)
B. \(15 cmHg\)
C. \(20 cmHg\)
D. \(10 cmHg\)

Question 1243:

Sound waves were sent out from a source and after being reflected from an obstacle were received by a sensor placed beside the source. If the waves were received 10 seconds after they were sent out, calculate the distance between the source and the obstacle. (Speed of sound = \(330 m / s\) )

A. \(990 m\)
B. \(660 m\)
C. \(1320 m\)
D. \(1750 m\)

Question 1244:

Which of the following is not true about a chemical cell?

A. In primary cells the process through which current is generated is irreversible
B. Secondary cells can be recharged after they run down by passing a current into the cell in the reverse direction
C. Positive ions are attracted to the positive electrode where they become neutralized by acquiring electrons
D. Primary cells can be recharged

Question 1245:

Calcium has a work function of \(19 eV\) with wavelength of \(150 nm\). Calculate the maximum energy of a photo electron emitted. (leV \(=1.6 \times 10^{-19} J , h=6.6 \times 10^{-34} J\) s)

A. \(6.35 EV\)
B. \(8.25 eV\)
C. \(14.60 eV\)
D. \(2.30 eV\)