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 $600m$ 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 $0.000012C^{-1}]$

A. $0.18cm$
B. $1.80cm$
C. $18.00cm$
D. $1800cm$

Question 1183:

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

A. $12cm$ behind the mirror
B. $12cm$ at the front of the mirror
C. $3cm$ behind the mirror
D. $3cm$ at the front of the mirror.

Question 1184:

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

A. $0.144N$.
B. 0.36 N
C. 0 .009 N
D. 0 .27 N

Question 1185:

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

A. $2.3mi{n}^{-1}$
B. $3.21mi{n}^{-1}$
C. $0.1497mi{n}^{-1}$
D. $5mi{n}^{-1}$