OAU Physics 2015/2016 Past Questions

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

The surface tension of water can be reduced by adding the following except

A.detergent
B.oil
C.grease
D.sand

Which of the following is not a Newton's law of motion?

A.The time rate of change of linear momentum is directly proportional to the external force applied and it takes place in the direction of the force.
B.In the absence of external forces, an object at rest remains at rest and an object in motion continues in motion with a constant velocity.
C.If two objects interact, the force, F12, exerted by object 1 on object 2 is equal in magnitude and opposite in direction to the force, F21, exerted by object 2 on object 1.
D.The force required to stretch or compress a spring is directly proportional to the extension or compression, provided that the elastic limit is not exceed.

Which of the following statements is true about collision event?

A.in elastic collision, both linear momentum and kinetic energy are conserved.
B.In elastic collision, linear momentum is conserved but the kinetic energy is not conserved.
C.In inelastic collision, both linear momentum and kinetic energy are conserved.
D.In inelastic collision, kinetic energy is conserved but the linear momentum is not conserved.

A force of 10N is applied to a spring of elastic spring constant of 200N/m. Calculate the energy stored in the spring.

A.2.50J
B.0.25J
C.400J
D.40.0J

Which of the following statements is not true about the properties of pressure in a liquid? Pressure

A.at any point in a liquid is at right angle in all directions.
B.is the same at all points on the same horizontal plane in a liquid.
C.decreases with height, and independent of shape and volume of the container.
D.is dependent on the shape and volume of the container.

Calculate the acceleration of the system (in terms of the acceleration due to gravity, g), when it is released.

A.0.38g
B.0.13g
C.0.15g
D.0.39g

The reading on ADE temperature scale at the ice melting point is 40°A and 80°A at the steam point. Calculate the reading on the Celsius scale equivalent to 50°A.

A.25°C
B.40 C
C.45°C
D.60°C

Calculate the heat required to convert 10g of ice at -10°C to water at 50°C. The specific heat capacity of ice and water are 2100J/kgK and 4200 J/kgK respectively. The latent heat of fusion of ice is 3.4 x 10⁵JK^-1

A.2.10kJ
B.4.20kJ
C.3.21kJ
D.5.71 kJ

Which of the following combination of factors do not affect evaporation?
(i) Temperature (ii) Nature of liquid exposed (iii) Impurities (iv) Pressure (v) Humidity (vi) Draught (vii) linear expansivity (viii) electro negativity

A.vii and viii
B.i,ii,iii
C.iii,iv,v,vi
D.i,ii,iii,iv,v

A solid is said to sublime if it changes from

A.solid to liquid state
B.solid to molten state
C.solid to gaseous state
D.solid to solid state

Anomalous behavior of water refers to

A.boiling of water at 100°C
B.freezing of water 0°C
C.contraction of water when it is heated between 0°C and 4°C
D.evaporation of water at ambient temperature

Which of the following is not a self-luminous object?

A.glow - worm
B.star
C.moon
D.sun

Which of the following is not an application of Total Internal Reflection?

A.Mirage
B.Binoculars
C.Optical Fibers
D.Driving mirror

Which of the following is not an eye defect?

A.Astigmatism
B.Hypermetropia
C.Presbyopia
D.Malaopia

Sound wave of velocity 340m/s is reflected from an obstacle 5 seconds after leaving the source. Calculate the distance between the source and the obstacle.

A.340m
B.680m
C.1020m
D.850m

Five 20 resistors were connected in two ways, in series and parallel. What is the ratio of the series equivalent resistance to parallel equivalent resistance?

A.1:50
B.2:5
C.1:25
D.5:6

Calculate the energy stored in a capacitor of capacitance 50µF when a voltage of 220V is applied to its terminals.

A.2.0Joule
B.1.0Joule
C.3.0Joule
D.4.0Joule

Calculate the equivalent capacitance between the terminals.

A.6C/11
B.C/6
C.17C/6
D.6C

A material of threshold frequency 4.5 x 10¹⁵Hz, was bombarded with Photons of frequency 8.0 x 10¹⁵Hz. What is the kinetic energy of the emitted photoelectrons (in eV)? [h = 6.60 x 10^-34Js, 1eV = 1.6 x 10^-19J]

A.2.81eV
B.2.19eV
C.5.00eV
D.None of the above

Which of the following is not true of a force experienced by a current carrying conductor placed in a magnetic field? The force is proportional to

A.the length of the conductor
B.the magnetic field strength
C.the density of the conductor
D.the current in the conductor

Which of the following is the function of a p-n junction semiconductor device?

A.It transforms a direct voltage to AC voltage
B.It steps up an AC voltage
C.It steps down an AC voltage
D.It transforms AC voltage to direct voltage