Post Utme Physics Past Questions and Answers

Question 361:

A potential difference of 5 V is used to produce a current of 4 A for 4 hours through a heating coil.
What is the heat produced?

A. 80J
B. 4.8 kJ
C. 20 J
D. 4800kJ

Question 362:

Determine the absolute temperature at which the Fahrenheit temperature is twice the Celsius

A. 299.82K
B. 433.15K
C. 273.25K
D. 406.35K

Question 363:

Which of the following law forms the basis of the thermometry?

A. Charles' and Gay-Lussac's law
B. Fist law of thermodynamics
C. Boyle's and pressure law
D. Zeroth law of thermodynamics

Question 364:

A 500m long aluminium chair expands when it was placed in the sun. Its temperature increases from 20°C to 60°C.
Determine its new length. [a=2.30x10 5K 1].

A. 500.46m
B. 456.65m
C. 540.28m
D. 460.32m

Question 365:

An electric heater which produces 900 W of power is used to vaporize water.
How much water at 34. 100°C can be changed to steam in 3 mins by the heater?
[Heat of vaporization = 2.26x106 J/kg, Specific heat capacity of water-4.2x103 J/kg.K]

A. 0.0226 kg
B. 0.275 kg
C. 0.072 kg
D. 0.167 kg