Post Utme Physics Past Questions and Answers

Question 821:

The range of wavelengths of the visible spectrum is $400\mathrm{nm},700\mathrm{nm}$. The wave length of gamma rays is ____________

A. Longer than $700\mathrm{nm}$
B. Shorter than $700\mathrm{nm}$ but longer than $400\mathrm{nm}$
C. $550\mathrm{nm}$
D. Shorter than $400\mathrm{nm}$
E. Infinite

Question 822:

If the pressure in $100{\mathrm{cm}}^3$ of an ideal gas is doubled while its Kelvin temperature is halved, then the new volume of the gas will become

A. $25{\mathrm{cm}}^3$
B. $50{\mathrm{cm}}^3$
C. $100{\mathrm{cm}}^3$
D. $200{\mathrm{cm}}^3$
E. $16\mathrm{m}/\mathrm{s}$

Question 823:

A train has an initial velocity of $44\mathrm{m}/\mathrm{s}$ and an acceleration of $4\mathrm{m}/{\mathrm{s}}^2$ its velocity after 10 seconds is ____________

A. $2\mathrm{m}/\mathrm{s}$
B. $4\mathrm{m}/\mathrm{s}$
C. $8\mathrm{m}/\mathrm{s}$
D. $2\mathrm{m}/\mathrm{s}$

Question 824:

A man of mass $50\mathrm{kg}$ ascends a flight of stairs $5\mathrm{m}$ high in 5 seconds. If acceleration due to gravity is $10\mathrm{ms}10\mathrm{ms}2$ the power expanded is ____________

A. $100\mathrm{W}$
B. $300\mathrm{W}$
C. 250W
D. $400\mathrm{W}$
E. $500W$

Question 825:

The distance travelled by a particle starting from rest Is plotted against the square of the time elapsed from the commencement of motion. The resulting graph is Ilnear. The slope of this graph is a measure of ____________

A. Initlal displacement
B. Initlal velocity
C. Acceleration
D. Half the acceleration
E. Half initial velocity