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

Question 11 :

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

A. \(120 ms\)
B. \(120 m / s\)
C. \(2.12 m / s\)
D. \(102 m / s\)

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 \(=330 m / s\) )

A. \(138 m\)
B. \(198 m\)
C. \(275 m\)
D. \(296 m\)

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

A. \(2 mins\)
B. \(9 mins\)
C. \(10 mins\)
D. \(20 mins\)

Question 15 :

A cell with an emf of \(1.5 V\) 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. \(0.25 A\)
B. \(2.5 A\)
C. \(0.5 A\)
D. \(0.75 A\)