OAU Physics 2022/2023 Past Questions

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

A quantity is defined as the product of cross-sectional area and change in momentum per unit length. Which of the following is its SI unit?

A.Nm
B.kgs^-1
C.kgm²s^-1
D.Nkgs^-1

A rectangular concrete block 40 cm x 30 cm x 60 cm of mass 10 kg rests on a horizontal flat surface. What is the minimum pressure it can possibly exert on the surface?

A.816.6 Nm^2
B.816.6 Nm^2
C.555.56Nm^-2
D.608.4 Nm

A simple hydrometer consists of uniform cylinder suitably weighted to float upright in most common liquids. It is graduated to read the relative density of a liquid directly. Which of the following is NOT correct?

A.When placed in a liquid, it displaces exactly its own weight of the liquid
B.Its graduation increases from top to base
C.When placed in a liquid, it displaces exactly its own volume of the liquid
D.The product of the volume and density of liquid displaced is equal to its mass

The angle between the earth's magnetic field and the horizontal is called angle of

A.declination
B.dip
C.variation
D.inclination

The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtone are there between 40Hz and 150 Hz?

A.1
B.2
C.3
D.4

Which of the following statement supports the assumption that light travels straight lines?

A.Light can be diffracted
B.A source of light produces distance shadows of opaque objects
C.A source of light produces interference patterns on suitably placed screen
D.Light can reflected

If an object is placed in front of two mirrors inclined at 90°, how many images will be formed?

A.five
B.four
C.three
D.two

An object 3.0cm high is placed 60.0cm from converging lens whose focal length is 20.0cm. Calculate the size of the image formed.

A.0.5cm
B.1.5cm
C.2.0cm
D.6.0cm