UNIZIK Physics 2009/2010 Day 1 Past Questions

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

The height at which the atmosphere cease to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is

A.380mmHg
B.570mmHg
C.190mmHg
D.480mmHg

Objective

Question 2

A stone of mass 1 kg is dropped from a height of 10m above the ground and it falls freely under gravity. Its kinetic energy 5m above the ground is then equal to

A.its kinetic energy on the ground
B.twice its initial potential energy
C.its initial potential energy
D.half its initial potential energy

Objective

Question 3

If a spherical metal bob of radius 3cm is fully immersed in a cylinder containing water and the water level rises by 1cm, what is the radius of the cylinder?

A.12cm
B.1cm
C.3cm
D.6cm

Objective

Question 4

The resultant of two forces acting on an object is maximum if the angle between them is :

A.45°
B.0°
C.90°
D.180°

Objective

Question 5

The efficiency of a machine is always less than 100% because

A.the work output is always greater than the work input
B.the load lifted is always greater than the effort applied
C.the effort applied is always greater than the load lifted
D.the velocity ratio is always greater than the mechanical advantage.

Objective

Question 6

The thermometric substance of an absolute thermometer is a

A.alcohol
B.mercury
C.helium
D.plantinum

Objective

Question 7

which of the following metals will provide the greatest shield against ionizing radiation?

A.Iron
B.Lead
C.Manganese
D.Aluminium

Objective

Question 8

Energy losses through eddy currents are reduced by using

A.low resistance wires
B.insulated soft iron wires
C.few turns of wire
D.high resistance wire

Objective

Question 9

Which of the following instruments is suitable for making the most accurate measurement of the internal diameter of a test tube.

A.meter rule
B.pair of calipers
C.a micrometer screw gauge
D.a tape rule

Objective

Question 10

An object weight 10N in air and 7N in water. what is the weight when immersed in a liquid of relative density 1.5?

A.4.5N
B.4.67N
C.5.5N
D.8.5N

Objective

Question 11

The absolute zero temperature is defined as the temperature at which

A.thermal motion ceases
B.the temperature of the gas is -273°C
C.ice melts
D.the volume of areal gas is maximum

Objective

Question 12

Which of the following is not a suitable method for reducing loss of heat from a piece of hot maximum iron?

A.wrapping it in cotton wool
B.painting it black
C.placing it in a vacuum
D.keeping it in a closed wooden box

Objective

Question 13

A concave mirror of radius of curvature 20cm has a pin placed at 15cm from its pole. What will be the magnification of the image formed?

A.4.00
B.2.00
C.1.33
D.1.50

Objective

Question 14

Birds can perch safely on overhead electric power cables witout being electrocuted because

A.birds can withstand high p.d of the electric power cables
B.any accumulated charge on the birds is quickly dissipated
C.the feet of the birds are well insulated
D.there is no p.d. between the birds and the cables

Objective

Question 15

Viscosity of a liquid does not depend on the

A.nature of the liquid
B.area of the surfaces in contact
C.normal reaction between the liquid layers
D.temperature of the liquid

Objective