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 611: The terminal velocity of a ball-bearing falling through a viscous fluid reached when the
Options:
A) upthrust is equal to the weight of the ball
B) ball accelerate uniformly
C) upthrustis equal to the velocity of the ball
D) velocity is uniform
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The correct answer is D .
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Question 612:
A solid weighs10.00N in air,6N when forcefully immersed in water, and 7.0N when fully immersed in a liquid, X. Calculate the relative density of the liquid X.
Options:
A)
B)
C)
D)
Show Answer
The correct answer is C .
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Question 613: In free fall, a body of mass 1kg drops from a height of 125m from rest in 5s. How long will it take another body of mass 2kg to fall from rest from the same height? [g = 10ms-1·]
Options:
A) 5s
B) 10s
C) 12s
D) 15s
Show Answer
The correct answer is A .
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Question 614: When a certain a.c supply is connected to a lamp, it lights with the same brightness as it does with a 12 V d.c battery. Then r.m.s value of the a.c supply is?
Options:
A) 12.0 V
B) 3.5 V
C) 17.0 V
D) 8.5
Show Answer
The correct answer is A .
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Question 615: Which of the following surfaces will absorbs radiant heat energy heat?
Options:
A) white
B) red
C) black
D) blue
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The correct answer is C .
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Question 616: The speed of sound in air at sea-level is 340ms-1 while that of light is 300 000kms-1. How far (to the nearest meter) from the center of a thunderstorm is an observer who hears a thunder 2s after a lightening flash?
Options:
A) 170ms-1
B) 340ms-1
C) 600ms-1
D) 680ms-1
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The correct answer is D .
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Question 617: A block of aluminum is heated electrically by a 30 w heater if the temperature rises by 10°c in 5 minutes, the heat capacity of the aluminum is
Options:
A) 900 JK-1
B) 90 JK-1
C) 100 JK-1
D) 200 JK-1
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The correct answer is A .
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Question 618:
A relative density bottle has a mass of 19 g when empty. When it is completely filled with water, its mass is 66 g. What will be its mass if completely filled with alcohol of relative density 0.8?
Options:
A) 47 g
B) 52.8 g
C) 37.6 g
D) 56.6 g
Show Answer
The correct answer is D .
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Question 619:
In an experiment in which molten naphthalene is allowed to cool, the cooling curve in fig 5 was obtained, the temperature is known as
Options:
A) cooling temperature
B) boiling point
C) melting point
D) vaporization point
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The correct answer is C .
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Question 620:
An open-tube mercury manometer is used to measure the pressure in a gas tank. When the atmospheric pressure is 101,325 , what is the absolute pressure in in the tank if the height of the mercury in the open tube is 25 cm higher. density of mercury =
Options:
A) 108,986 Pa
B) 165,238 Pa
C) 122,364 Pa
D) 134,645 Pa
Show Answer
The correct answer is D .