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 601: Which of the following statements defines correctly the efficiency of a machine?
Options:
A) the load carried by the machine divided by effort required in carrying the load
B) the distance moved by the load divided by the distance moved by the effort
C) the useful work done by the machine divided by the total work put into the machine
D) the movement of the load divided by the movement of the effort about the same point
E) the temperature at the end of the application of the machine divided by the initial temperature
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The correct answer is C .
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Question 602:
The figure above shows three capacitors, 2μF, 3μF and 6μF connected in series. If the p.d across the system is 12V, the p.d, across the 6μF capacitor is
Options:
A) 4V
B) 12V
C) 2V
D) 6V
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The correct answer is C .
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Question 603: The wavelength of the first overtone of a note in a closed pipe of length 33 cm is?
Options:
A) 33 cm
B) 44 cm
C) 22 cm
D) 17 cm
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The correct answer is B .
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Question 604: Consider a thick glass tumbler and a thin glass tumbler which are made of the same kind of glass. Some hot liquid is poured into them. Which of the following statements is correct?
Options:
A) the thick tumbler is less likely to crack because it is stronger
B) the thick tumbler is less likely to crack because it insulates the heat beter, glass being a poor conductor of heat
C) Both tumblers are equally likely to crack because they are made of the same kind of glass
D) the thick tumbler is more likely to crack because uneven expansion persists for a longer time within the thicker glass
E) the thick tumbler is more likely to crack because it is heavier
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The correct answer is C .
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Question 605: Which of the following consists entirely of vector quantities?
Options:
A) Velocity, magnetic fulx and reaction
B) Tension, magnetic flux and mass
C) Displacement, impulse and power
D) Work, pressure and moment
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The correct answer is A .
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Question 606: If the relative density of gold is 19.2, the volume of 2.4kg of gold is?
Options:
A) 8.00 x 10-3 m3
B) 1.25 x 10-4 m3
C) 1.92 x 10-4 m3
D) 4.61 x 10-3 m3
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The correct answer is B .
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Question 607: Which of these statements are correct for the pressures in liquids? i. pressure in a liquid at a point acts equally in all directions. ii. pressure increases with depth. iii. pressure at a depth depends on the shape of the container. iv. pressure at the same depth in different liquids are proportional to the density at different liquids.
Options:
A) i, ii, iii only
B) i, ii, iv only
C) i, iii, iv only
D) ii, iii, iv only
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The correct answer is B .
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Question 608: Which of the following instruments helps to maintain the correct humidity and temperature of a building?
Options:
A) A compressor
B) A refrigerator
C) Air blower
D) Air conditioner
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The correct answer is D .
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Question 609: The operation of an optical fibre is based on the principal of
Options:
A) dispersion of light
B) interference of light
C) refraction of light
D) polarization of light
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The correct answer is C .
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Question 610: Calculate the escape velocity of a satellite launched from the earth's surface if the radius of the earth is 6.4x106m
Options:
A) 25.3kms-1
B) 4.2kms-1
C) 4.0kms-1
D) 11.3kms-1
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The correct answer is D .