Post Utme Physics Past Questions and Answers

Question 1181:

A platinum resistance thermometer wire has a resistance of 5 ohms at \(0^{\circ} C\) and \(5.5\) ohms at \(100^{\circ} C\). Calculate the temperature of the wire when the resistance is \(5.2\) ohms

A. \(80^{\circ} C\)
B. \(60^{\circ} C\)
C. \(40^{\circ} C\)
D. \(10^{\circ} C\)

Question 1182:

A bridge made of steel is \(600 m\) long. What is the daily variation in its length if the night-time and day-time temperature are \(10^{\circ} C\) and \(35^{\circ} C\) respectively? [The linear expansivity of steel is \(\left.0.000012 C ^{-1}\right]\)

A. \(0.18 cm\)
B. \(1.80 cm\)
C. \(18.00 cm\)
D. \(1800 cm\)

Question 1183:

An object is placed \(4 cm\) away from a concave mirror of focal length \(6 cm\), what is the image position

A. \(12 cm\) behind the mirror
B. \(12 cm\) at the front of the mirror
C. \(3 cm\) behind the mirror
D. \(3 cm\) at the front of the mirror.

Question 1184:

The force of repulsion between two charges of \(+2 \mu C\) separated by a distance of \(50 cm\) is ? \(\left(k=9 \times 10^{9}\right)\).

A. \(0.144 N\).
B. 0.36 N
C. 0 .009 N
D. 0 .27 N

Question 1185:

The half-life of a radioactive substance is \(0.216 min\). What is the value of the decay constant?

A. \(2.3 min ^{-1}\)
B. \(3.21 min ^{-1}\)
C. \(0.1497 min ^{-1}\)
D. \(5 min ^{-1}\)