UNIZIK Physics 2009/2010 Day 2 Past Questions

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

The density of 400cm³ of palm oil was 0.9 g/cm³ before frying. If the density of the oil was 0.6 g/cm³ after frying, assuming no loss of oil due to spiling, its volume was

A.360 cm³
B.600 cm³
C.240 cm³
D.800 cm³

If a given mass of gas at constant pressure obeys the relation — volume is proportional to the absolute temperature - the gas is said to obey

A.Hooke's law
B.Boyle's law
C.Newton's law
D.Charles's law

Two closed vessels contain equal volume of boiling water and are identical except that one is blackened on the outside while the other is polished. Which of the following is correct?

A.the polished vessel will cool faster because a polished surface is a good radiator
B.the polished vessel will cool faster because it will absorb less heat from the room
C.the black vessel will cool faster because it is a better conductor of heat
D.the polished vessel will cool faster because it reflects heat better.

When the vapour of a substance is in equilibrium with its own liquid, it is said to be

A.gaseous
B.diffused
C.saturated
D.unsaturated

Which of the following statement is correct? The magnetized state of an iron bar can be destroyed completely by

A.heating the bar to a high temperature
B.breaking the bar
C.connecting opposite poles with a small piece of iron
D.placing the bar inside a strong magnetic field

An electric cell has an internal resistance of 2ohms. A current of 0.5A is found to flow when a resistor of 5ohms resistance is connected across it. What is the electromotive force of the cell?

A.5 volts
B.3.5 volts
C.2.5 volts
D.1.0 volt.

Which of the following is the correct definition of "half-life?

A.The time it takes a radioactive material to decay to half of its original quantity
B.The average life-time of a radioactive material
C.Half the period a radioactive material decays completely
D.Half of the decay constant.

A concave lens of focal length 20cm forms an image 1/2 the size of the object. The object distance is

A.100 cm
B.100/9 cm
C.60cm
D.60/7cm.

Which of the following is true of atoms?

A.Atoms are indestructible
B.All atoms of a pure substances or elements are identical
C.Atoms of different substances have different weights
D.All of the above.

Which of the following statement is true of the law of universal gravitation?

A.Any two bodies attract each other with a force which is proportional to the difference of their masses
B.Any two bodies attract each other with a force which is inversely proportional to the square of the distance between them
C.Any two bodies attract each other with a force which is proportional to the product of their masses and inversely proportional to the square of the distance between them
D.Any two bodies attract each other with a force which is directly proportional to the square of the distance between them.