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 11: Determine the inductive reactance when a 30.0mH inductor with a negligible resistance is connected to a 1.3 x 103Hz oscillator.
Options:
A) 39.0
B) 122.5
C) 245.0
D) 39000.0
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The correct answer is C .
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Question 12:

The diagram above shows two capacitors P and Q of capacitance 5μF and 10μF. Find the charges stored in P and Q respectively
Options:
A) 2μC and 4μC
B) 4μC and 2μC
C) 100μC and 200μC
D) 200μC and 100μC
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The correct answer is C .
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Question 13: An object moves with uniform speed round a circle. Its acceleration has
Options:
A) constant magnitude and constant direction
B) constant magnitude and varying direction
C) varying magnitude but constant direction
D) varying magnitude and varying direction
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The correct answer is B .
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Question 14:
Light of wavelength 589 nm in vacuum passes through a piece of fused quartz of index of refraction n = 1.458. What is the frequency of the light in fused quartz?
[Speed of light c = ]
Options:
A) Hz
B) Hz
C) Hz
D) Hz
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The correct answer is B .
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Question 15: Which of the following phenomena is called photoelectric effect?
Options:
A) high energy electrons impinge on a metalic anode which then emits photons
B) a high energy photon emits photons as it slowed down
C) a metal absorbs quanta of light and then emits electrons
D) Two electrons are created from a quantum of light
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The correct answer is C .
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Question 16: In Faradays law of electrolysis, a graph of the mass deposited against the quantity of electricity is plotted. The slope of the graph gives
Options:
A) the energy released
B) the electrochemical equivalent
C) the current flowing
D) the charge released
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The correct answer is B .
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Question 17: water is a poor thermometric liquid because it
Options:
A) is opaque
B) is a poor conductor
C) wets glass
D) has low vapour pressure
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The correct answer is B .
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Question 18: The earth is four times the size of the moon and the acceleration due to gravity on the earth is 80 times that on the moon. The ratio of the mass of the moon to that of the earth is
Options:
A) 1:80
B) 1:320
C) 1:1280
D) 1:4
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The correct answer is A .
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Question 19: A radioactive substance has a half life of 20 days. What fraction of the original radioactive nuclei will remain after 80 days?
Options:
A)
B)
C)
D)
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The correct answer is B .
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Question 20: A machine requires 1000J of work to raise a load of 500N through a vertical distance of 1.5m. Calculate the efficiency of the
Options:
A) 80%
B) 75%
C) 50%
D) 33%
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The correct answer is B .