2009 - JAMB Physics Past Questions and Answers - page 5
41
It is observed that water will wet a clean glass because the
A
cohesion of water to glass is stronger than the cohesion of water molecules
B
adhesion of water molecules is weaker than the cohesion of water to glass
C
cohesion of water to glass is weaker than the cohesion of water molecules
D
adhesion of water molecules is stronger than the cohesion of water molecules
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42
A man standing 2 m from a charcoal fire is warmed mainly by
A
convection
B
radiation
C
refraction
D
conduction
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43
Metal cables are used as telephone wires because
A
they are cheap
B
they are sourced locally
C
the speed of sound in them is very low
D
the speed of sound in them is very high
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44
Musical instruments playing the same note can be distinguished from one another owing to the differences in their
A
quality
B
pitch
C
intensity
D
loudness
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45
I. Moon.
II. Sun.
III.street light.
IV. stars.
Which of these above is a natural source of light?
II. Sun.
III.street light.
IV. stars.
Which of these above is a natural source of light?
A
II, III, and IV only
B
I, II and III only
C
III and IV only
D
II and IV only
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46
An object is placed 5 cm from the pole of a concave mirror. if the focal length of the mirror is 10 cm. what is the image distance?
A
10 cm in front of the mirror.
B
5 cm in front of the mirror
C
10 cm behind the mirror
D
5 cm behind the mirror
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47
Calculate the position of an object placed in front of a convex mirror having focal length of 12 cm such that an image is formed 6 cm away from the mirror
A
4. 0 cm
B
3. 0 cm
C
12.0 cm
D
9.0 cm
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48
If the refractive index of crown glass is 1.51, its critical angel is.
A
48.6°
B
22.5°
C
41.5°
D
45.0°
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49
When light passes through two media x and y of refraction indices 1.51 and 1.33 respectively, the speed of light in
A
x is same as in y
B
x and y is same as in vacuum
C
x is higher than in y
D
y is higher than in x
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