2022 - JAMB Physics Past Questions and Answers - page 2
11
Which of the following liquid is a poor conductor of electricity?
A
Distilled water
B
Tap water
C
Sea water
D
Drinking water
12
An isotope has an initial activity of 120 Bq. 6 days later its activity is 15 Bq. What is half-life?
A
3 days
B
2 days
C
1 day
D
4 days
13
In order to remove the error of parallax when taking measurements with a metre rule, the eye should be focused___
A
slantingly towards the right on the markings
B
slantingly towards the left on the markings
C
vertically downwards on the markings
D
vertically upwards on the markings
14
An athlete standing waist-deep in a swimming pool appears to have short legs because of the light__?
A
diffraction
B
refraction
C
reflection
D
interference
15
A tuning fork that has a frequency of 312Hz emits a wave which has a wavelength of 1.10 m. Find the velocity of sound.
A
312.0 ms\(^{-1}\)
B
110.0 ms\(^{-1}\)
C
343.2 ms\(^{-1}\)
D
686.4 ms\(^{-1}\)
16
When the plate surface area of a capacitor increases, ___?
A
the voltage can withstand increase
B
the capacitance decreases
C
the capacitance is unaffected
D
the capacitance increases
17
An electromagnetic relay is a device used for?
A
reading the magnitude of magnetic flux
B
controlling another circuit carrying larger current
C
turning in sports
D
storing magnetic field
18
According to kinetic molecular model in gases,
A
the particles are closely packed together; they occupy minimum space are usually arranged in a regular pattern
B
the particles vibrate about fixed positions and are held together by the strong intermolecular bonds between them
C
the molecules are very far apart and occupy all the spaces made available to them
D
the particles occur in clusters with molecules slightly further apart
19
A current of 0.5 A flows through a resistor when connected to a 40 V battery. How much energy is dispatched in 2 minutes?
A
2400 J
B
9600 J
C
1500 J
D
1200 J
20
For a pear-shaped conductor shown, the concentration of charge on the outside is highest at?
A
X
B
Z
C
Y
D
K
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