Post Utme Ladoke Akintola University of Technology Physics Past Questions and Answers

Question 11:

Second harmonic motion of a string
$1.5m$ long fixed at both ends $80Hz$.
The speed of transverse wave in the string is

A. $120ms$
B. $120m/s$
C. $2.12m/s$
D. $102m/s$

Question 12:

The echo produced when a motion is fire from a ship some distance from cliff is heard 2 secontigalculate the distance of the ship (if the velocity of Sound in air $=330m/s$ )

A. $138m$
B. $198m$
C. $275m$
D. $296m$

Question 13:

Which of the following is not an example of a machine?

A. Screw
B. Lever
C. Horizontal plane
D. Pulley

Question 14:

How long will it take to heat $3kg$ of L1't from ${28}^{"}C$ in an electnc kettle taking 6Atfem 2 220V supply? (specitic heat capacity ofwater is $4180J/k$ )

A. $2mins$
B. $9mins$
C. $10mins$
D. $20mins$

Question 15:

A cell with an emf of $1.5V$ and an internal resistance of $10.$. fohims 1 connegted to two resistances of $2.0$ and $3.0$ ohms in series. The current produced by this cell is

A. $0.25A$
B. $2.5A$
C. $0.5A$
D. $0.75A$