Physics is the science that studies the nature and properties of matter and energy. It covers topics like motion, heat, light, sound, electricity, magnetism, and the structure of atoms.
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Question 31:
Which of the following is not a consequence of hydrogen bubbles covering the copper plate of a primary cell?
Options:
A) formation of hydrogen bubbles on the electrode
B) increase in the resistance of the cell
C) local action
D) polarization
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The correct answer is C .
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Question 32: If the inclination at Ibadan is 7oS, this means that
Options:
A) the angle between the geographic meridian and the magnetic meridian at Ibadan is 7o
B) the earth's magnetic intensity at Ibadan makes angle 7o with the horizontal direction
C) a magnetic needle will be inclined at 7o to the vertical at Ibadan
D) the north pole of a magnetic needle dips downward at Ibadan
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The correct answer is B .
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Question 33: When the human eye loses its power of accomodation, the defect is known as
Options:
A) short sightedness
B) presbyobia
C) astigmatism
D) long sightedness
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The correct answer is B .
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Question 34:
A turning fork of frequency 340Hz is vibrated just above a cylindrical tube of height 1.2m. If water is slowly poured into the tube, at what maximum height will resonance occur.
[speed of sound in air = 340ms-1]
Options:
A) 0.95m
B) 0.60m
C) 0.50m
D) 0.45m
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The correct answer is D .
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Question 35: A wheel and axle is used to raise a load of 500 N by the application of an effort of 250 N. If the radii of the wheel and the axle are 0.4 cm and 0.1 cm respectively, the efficiency of the machine is
Options:
A) 20 %
B) 40 %
C) 50 %
D) 60 %
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The correct answer is C .
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Question 36: A planet has mass m1 and is at a distance r, from the sun. A second planet has mass m2 = 10m1 and at a distance of r2 = 2r1 from the sun. Determine the ratio of the gravitational force experienced by the planets.
Options:
A) 1 : 5
B) 2 : 5
C) 3 : 5
D) 4 : 5
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The correct answer is B .
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Question 37:
The Earth's magnetic equator passes through Jos in Nigeria. At Jos, the
Options:
A) angle of variation is zero
B) magnetic declination is 90
C) angle of dip is zero
D) horizontal component at the Earth's field is zero
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The correct answer is C .
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Question 38:
A short bar magnet is placed in earth's magnetic field, as shown above, which of the points II and III are/is possible positions of a neutral point?
Options:
A) I only
B) II only
C) III only
D) I and II
E) I,II and III
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The correct answer is C .
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Question 39:
A mixture of blue and red pigment when illuminated by white light will appear
Options:
A) green
B) orange
C) purple
D) magenta
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The correct answer is C .
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Question 40: 40m3 of liquid is mixed with 60m3 of another liquid Q. If the density of P and Q are 1.00kgm-3 and 1.6kgm-3 respectively, what is the density of the mixture?
Options:
A) 0.05kgm-3
B) 1.25kgm-3
C) 1.30kgm-3
D) 1.36kgm-3
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The correct answer is D .