OAU Physics 2019/2020 Past Questions

Practice each question, then open it to see the full details.

An object is projected vertically upwards from the last floore of a six-storey building with a velocity of throw of 25m/s. If it took the object 8s to reach the ground level, what is the height of the building up to tha last flooor? g = 10 m/s

A.100m
B.50m
C.60m
D.120m

A car starts from rest and accelerates at 1.5m/s² until it reaches a velocity of 9m/s. The bus continues at this velocity and then decelerates at 2m/s² until it comes to a stop 500m from take off point. How long did the bus take throughout the motion?

A.60.8s
B.80.6s
C.40.8s
D.80.4s

A ball of mass 100g is being acted upon by a constant force of 50N for 2s. What is the impulse experienced by the ball in Ns

A.100
B.150
C.200
D.250

A model ship is towed by two cables A and B which are at 60° to eaach other. A exerts a pull of 20N while B exerts a pull of 30N. What is the resultant pull on the ship and the angle it makes with the 30N cable.

A.59N;23°
B.44N;23°
C.44N;32°
D.43N;23°

Which of the following are correct S.I units of the quantities indicated?
I. thrust (N) II. Impulse (Kd m s ^-1)ML²T^-3I^-1 III. Energy density (J) IV. Electromotive force

A.I and III only
B.II and III only
C.I,II, and IV only
D.I, III and IV

Two balls of masses 60g and 40g respectively, are attached firmly to the ends of a light metre rule. The centre of gravity of the system is

A.60cm from the heavier mass
B.at the mid-point of the metre rule
C.40cm from the lighter mass
D.40cm from the heavier mass

The half-life of a radioactive element is 9 days. Calculate the fraction that decayed after 36 days

A.1/16
B.1/32
C.1/8
D.1/64

The function of ammonium chloride solution in a leclanche cell is to

A.decrease the e.m.f of the cell
B.prevent local action in the cell
C.prevent polarization of the cell
D.ac as the electrolyte of the cell

The tension of a sonometer wire may be quadrupled by

A.doubling the length of the wire
B.doubling the mass of the wire
C.increasing the fundamental frequency of vibration
D.reducing the absolute temperature by half

The force on current carruing conductor in a magnetic field is least when the

A.conductor makes an angle of 100° with the field
B.force is independent of the angle between the conductor and the field
C.conductor is parallel with the field
D.conductor is at right angle with the field