1993 - WAEC Physics Past Questions and Answers - page 2
11
If the temperature of water is gradually increased from 0o to 4oC, the density of the water within this range
A
increases for a while and then decreases
B
decreases for a while and then increases
C
increases gradually
D
decreases gradually
12
The expansion of solids can be considered a disadvantage in the
A
fire alarm system
B
thermostat
C
riveting of steel plates
D
balance wheel of a watch
13
A solid metal cube of side 10 cm is heated from
10oC to 60oC. lf the linear expansivity of the metal is 1.2 x 105K-1, calculate the increase in its volume.
10oC to 60oC. lf the linear expansivity of the metal is 1.2 x 105K-1, calculate the increase in its volume.
A
0.6cm3
B
1.2 cm3
C
1.8 cm3
D
3.6 cm3
14
A gas has a volume of 546 cm3 at OoC. What is the volume of the gas at- 100oC if its pressure remains constant?
A
346cm3
B
446cm3
C
546cm3
D
646cm3
15
Which of the following are correct of plane- polarized light? I. Plane polarization of light is the formation of hydrogen bubbles on the particles of light. II. Plane polarization of light is the splitting of light into its spectral components III. Plane-polarized light vibrates in one plane only. IV. Polarization is characteristic of transverse waves.
A
I and II only
B
I and IV only
C
II and III only
D
III and IV only
16
Longitudinal waves cannot be
A
diffracted
B
retracted
C
polarized
D
reflected
17
An image which cannot be formed on a screen is said to be
A
inverted
B
real
C
virtual
D
erect
18
The images formed by a diverging lens are always
A
diminished, virtual and inverted
B
diminished inverted and real
C
diminished, virtual and erect
D
magnified, virtual and erect
19
In the normal use of a simple microscope, a person sees an
A
inverted, virtual and magnified image
B
erect, virtual and magnified image
C
erect, real and magnified image
D
inverted, real and magnified image
20
A lens of focal length 15.0 cm forms an upright image four times the size of an object. Calculate the distance of the image from the lens
A
11.3cm
B
18.8 cm
C
37.5cm
D
45.0cm
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