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 751: A solid weigh 10 .00 N in air, 6 N when fully immersed in water and 7 . 0 N when fully immersed in a liquid X. Calculate the relative density of the liquid, X.
Options:
A) 5/3
B) 4/3
C) 3/4
D) 7/10
Show Answer
The correct answer is C .
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Question 752: in a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively, what is the voltage across the capacitor?
Options:
A) 30V
B) 40V
C) 50V
D) 70V
Show Answer
The correct answer is B .
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Question 753: A liquid-in-glass thermometer should quickly register temperature changes. This is achieved by choosing a liquid that
Options:
A) is opaque
B) has high density
C) has regular expansion
D) has a high thermal conductivity
E) can wet glass
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The correct answer is D .
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Question 754: The mode of heat transfer which does not require a material medium is
Options:
A) conduction
B) radiation
C) convection
D) propagation
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The correct answer is B .
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Question 755:
I. Moon.
II. Sun.
III.street light.
IV. stars.
Which of these above is a natural source of light?
Options:
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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The correct answer is D .
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Question 756: A quantity of ice at 10oC is heated until the temperature of the heating vessel is 90oC. Which of the following constants is NOT required to determine the quantity of heat supplied to the vessel?
Options:
A) specific heat capacity of ice
B) specific heat capacity of water
C) specific latent heat of fusion
D) specific latent heat of vaporization
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The correct answer is D .
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Question 757:
The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20º and 80ºC respectively is?
Options:
A) 3.0 x 10km
B) 3.0 x 10km
C) 5.0 x 10km
D) 3.0 x 10km
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The correct answer is B .
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Question 758: Induced emfs are best explained using
Options:
A) Ohm's law
B) Faraday's law
C) Colomb's law
D) Lenz's law
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The correct answer is D .
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Question 759:
Which of the following statements on the use of X-rays is incorrect? X-rays are used
Options:
A) In a hospital to obtain photographs of tissues and bones in the body
B) For the treatment of malignant growths like cancer cells
C) In detecting fingerprints
D) To reveal hidden flaws in metal castings and welded joints work of art
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The correct answer is C .
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Question 760: Of the following derived units, the one that is not a unit of power is
Options:
A) joule/second
B) ampere volt
C) ampere2/volt
D) ohm2/volt
E) volts2
Show Answer
The correct answer is C .