2007 - JAMB Physics Past Questions and Answers - page 2
11
I. Increase the melting point of the liquid.
II. Increase the boiling point of the liquid.
III. Decrease the melting point of the liquid.
IV. Decrease the boiling point of the liquid.
which of the statement above about the effect on increase in pressure in a liquid are correct?
II. Increase the boiling point of the liquid.
III. Decrease the melting point of the liquid.
IV. Decrease the boiling point of the liquid.
which of the statement above about the effect on increase in pressure in a liquid are correct?
A
I and II only
B
I and III only
C
II and III only
D
III and IV only
correct option: c
Increase in pressure generally raises the boiling point but but lowers the melting point. II and III
Users' Answers & Comments12
I. Mass
II. Density
III. Temperature
IV. Nature of substance
which of the above affect diffusion?
II. Density
III. Temperature
IV. Nature of substance
which of the above affect diffusion?
A
I and II only
B
I,II and IV only
C
II, III and IV only
D
I, II, III and IV
correct option: b
Rates of diffusion of a substance generally depend on density temp. and nature of substance II,III and IV
Users' Answers & Comments13
The blade of a hoe feel colder to touch in the morning than the wooden handle because the
A
handle is a better conductor of heat than blade
B
handle contains stored energy in form of heat
C
blade is a better conductor of heat than the handle
D
blade is placed at a lower temperature than the heat
correct option: c
Users' Answers & Comments14
I. They should be identical
II. They should originate from the same source.
III. They should be coherent.
IV. They should be monochromatic.
from the statements above, the conditions for two waves to interfere are?
II. They should originate from the same source.
III. They should be coherent.
IV. They should be monochromatic.
from the statements above, the conditions for two waves to interfere are?
A
I,II and III only
B
I, III and IV only
C
II, III and IV only
D
I, II, III and IV
correct option: b
Users' Answers & Comments15
In a large telecommunications auditorium, perforated absorbent materials are used to line the ceiling so as to
A
Increase the reverberation of sound in the hall
B
increase the amount of echo in the hall
C
reduce the hight of the ceiling from the floor
D
reduce the reverberation of sound in the hall
correct option: d
In a large auditorium perforated, absorbent materials are used to line the ceiling so as to reduce the effect of multiple reflection of echo called reverberation
Users' Answers & Comments16
The phenomenon of light bending round an obstacle is?
A
diffraction
B
refraction
C
reflection
D
polarization
correct option: a
Users' Answers & Comments17
The instrument used by designers to obtain different color pattern is called?
A
periscop
B
sextant
C
episcope
D
kaleidoscope
correct option: d
Users' Answers & Comments18
A glass plate 0.9cm thick has a reflective index of 1.50. how long does it take for a pulse of light to pass through the plate?
[c = 3.0 x 8 ms-1]
[c = 3.0 x 8 ms-1]
A
4.5 x 10-11s
B
4.5 x 10-10s
C
4 .5 x 10-12 s
D
3.0 x 10-10s
correct option: c
N = 1.5 = (speed of light in glass)/speed of light in air
(1.5)/1 = (3.0 x 108)/V
V = (3.0 x 108)/1.5
V = 2.0 x 108 ms-1
But x = Vt
t = (x)/Vt
t = (x)/v = (9 x 10)4/2.0x 108 = 4.5 x 10-2S
∴ Time = 4.5 x 10-12S
Users' Answers & Comments(1.5)/1 = (3.0 x 108)/V
V = (3.0 x 108)/1.5
V = 2.0 x 108 ms-1
But x = Vt
t = (x)/Vt
t = (x)/v = (9 x 10)4/2.0x 108 = 4.5 x 10-2S
∴ Time = 4.5 x 10-12S
19
When an object is placed between the principal focus and the optical center of a convex lens, it could be used as a?
A
Simple microscope
B
refecting lens
C
compound microscope
D
projector
correct option: a
Users' Answers & Comments20
The production of pure spectrum could easily be achieved using a?
A
glass prism with a pin
B
triangular prism with two convex lens
C
traingular prism only
D
triangular prism with two concave lenses
correct option: b
Users' Answers & Comments