UNIZIK Physics 2014/2015 Day 2 Past Questions

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

When the size of the hole in a pin-hole camera is increased, the result is

A.A blurred image
B.magnified image
C.correction for chromatic aberration
D.sharper focus of the image
E.no much effect

The mechanical advantage of an inclined plane depends on:

A.Its length
B.its height
C.The product of its height and length
D.the ratio of its length to its height
E.the difference between its height and length.

On dispersing white light with spectrometer, the component with the shortest wave-length is

A.Orange
B.Green
C.Violet
D.Red
E.Yellow

One of this is a vector:

A.Electric charge
B.electric field
C.Electric potential difference
D.Electric capacitance
E.Electric resistance

Surface tension is important in:

A.The Floating of a ship in water
B.The Floating of a dry needle in water
C.The Floating of a balloon in air
D.The diffusion of sugar solution across a membrane
E.The diffusion of digested food in animals

Thermionic emission is the process by which

A.beta rays are produced
B.gamma rays are produced
C.alpha rays are produced
D.electrons leave hot element
E.electrons are transferred to hot clement

Conveyor belts have rough surfaces in other to

A.Make them carry more load
B.Make them stronger
C.protect them when loads are on them
D.Make them slip less
E.last longer

Most of the gas in a discharge tube is pumped out so that electricity is conducted at:

A.high pressure
B.low pressure
C.low voltage
D.steady voltagee. high voltage

The ground is cold at night because

A.Sun no longer shines at night
B.Atmosphere reflects the sun's energy at nightc. Atmosphere absorbs the sun's energy at night
C.There is dew at night
D.Earth radiates heat to the atmosphere at night

If the refractive index of a medium is 2.0, what is the critical angle for this medium?

A.30
B.41
C.45
D.50
E.55