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 261: At a fixed point below a liquid surface, the pressure downwards is P1 and pressure upwards is P2. It can be deduced that
Options:
A) P1 > P2
B) P1 ≥ P2
C) P1< P2
D) P1 = P2
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The correct answer is A .
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Question 262:
The wire X in the figure above is at right angles to the plane of the paper and carries a current into the paper. at which of the points labelled 1-4, will the magnetic flux density due to this current be in the same direction as that of the horizontal component of earth's magnetic field
Options:
A) 1
B) 2
C) 3
D) 4
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The correct answer is C .
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Question 263:
A ship travelling towards a cliff receives the echo of its whistle after 3.5 seconds. A short while later, it receives the echo after 2.5 seconds. If the speed of sound in air under the prevalling condition is 250ms-1, how much closer is the ship to the cliff?
Options:
A) 10m
B) 350m
C) 175m
D) 125m
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The correct answer is D .
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Question 264: In a fission process, the decrease in mass is 0.01%. How much energy could be obtained from the fission of 0.1g of the material
Options:
A)
B)
C)
D)
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The correct answer is A .
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Question 265: A machine has a velocity ratio of 5. It requires a 50kg weight to overcome a 200kg weight. The efficiency is
Options:
A) 4%
B) 5%
C) 40%
D) 50%
E) 80%
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The correct answer is E .
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Question 266:
If the stress on a wire is 10NM and the wire is stretched from its original length of 10.00m to 10.05m. The young'smodulus of the wire is?
Options:
A) 5.0 x 10Nm
B) 5.0 x 10Nm
C) 2.0 x 10Nm
D) 2.0 x 10Nm
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The correct answer is D .
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Question 267: A piano wire 0.5m long has a total mass of 0.01kg and is stretched with a tension of 800N. Calculate the frequency of the wire when it sounds its fundamental note
Options:
A) 200Hz
B) 100Hz
C) 4Hz
D) 2Hz
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The correct answer is A .
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Question 268:
A projectile is fired from the ground level with a velocity of 300ms-1 at an angle of a 30o to the horizontal.
Calculate the time taken to reach the maximum height?
[g = 10ms-2]
Options:
A) 30s
B) 20s
C) 25s
D) 15s
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The correct answer is D .
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Question 269: The spectrum of white light consists of coloured lights arranged in the following order
Options:
A) blue, red, green, yellow, indigo, violet, orange
B) red, orange, yellow, green, blue, indigo, violet
C) red, orange, yellow, indigo, green, blue, violet
D) indigo, green, blue, violet, yellow, red, orange
E) yellow, blue, green, violet, orange, indigo, red
Show Answer
The correct answer is B .
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Question 270: When a telescope is in normal use, the final image is at
Options:
A) Infinity
B) The focus
C) The radius of curvature
D) The near point
Show Answer
The correct answer is A .