2016 - JAMB Physics Past Questions and Answers - page 5
41
Boiling occurs when the vapour pressure of a liquid is
A
At the evaporation point
B
Less than the atmospheric pressure
C
Greater than the atmospheric pressure
D
Equal to the atmospheric pressure
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42
If the magnification of a virtual image formed by an object 10cm from a convex less is 3, then the focal length of the lens is
A
10cm
B
20cm
C
25cm
D
15cm
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43
An electron in a hydrogen atom makes a transition from the ground level to the third level. If the energy at the ground level,calculate the energy at the third level.
[h = 6.6 x 10-34Js; f = 1015Hz]
A
1.41eV
B
1.71eV
C
1.61eV
D
1.51eV
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44
A
C
B
D
C
B
D
A
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45
A
R
B
X
C
S
D
P
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46
A
4.78mm
B
4.16mm
C
4.66mm
D
4.70mm
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47
A
MP
B
SN
C
NS
D
PM
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48
Which of the following statements is Not true about atoms?
A
Atom of different elements have different atomic weights
B
The mass of an atom is concentrated in the nucleus
C
An atom is made up of a nucleus and number of electrons
D
Atoms of all elements are identical
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49
The frequency of beats produced when two tunning forks of frequencies 258Hz and 270Hz are sounded close to each other
A
6Hz
B
264Hz
C
528Hz
D
12Hz
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50
Calculate the inductance of a coil of resistance 30(\Omega) connected to a 100V a.c source if the coil draws an r.m.s current of 2A
A
0.60H
B
2.50H
C
1.25H
D
0.04H
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