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 581: A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms-1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is(take g = 10ms-2)
Options:
A) 5 J
B) 10 J
C) 15 J
D) 20 J
Show Answer
The correct answer is C .
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Question 582:
One of the features of the fission process is that
Options:
A) it leads to chain reaction
B) its products are not radioactive
C) neutrons are not released
D) the of the masses of the reactants equals the sum of the masses of the products
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The correct answer is A .
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Question 583:
The figure above shows two waveforms X and Y. If the frequency of X is 30Hz what is the frequency of Y
Options:
A) 12Hz
B) 19Hz
C) 60Hz
D) 75Hz
Show Answer
The correct answer is D .
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Question 584:
In the diagram above, if the south poles of two magnets stroke a steel bar, the polarities at X and Y will respectively be
Options:
A) south and north
B) north and south
C) north and north
D) south and south
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The correct answer is C .
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Question 585: A man whose mass is 80kg climbs a staircase in 20s and expends power of 120W. Find the height of the staircase.[g = 10ms-2]
Options:
A) 1.8m
B) 2.0m
C) 2.5m
D) 3.0m
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The correct answer is D .
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Question 586:
The diagram above shows a meter bridge in which two of thee arms contain resistances R and 2Ω. A balance point is obtained at 60cm from the left end , calculate the value of R
Options:
A) 1.2Ω
B) 1.3Ω
C) 3.0Ω
D) 6.0Ω
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The correct answer is C .
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Question 587:
Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss;
Specific heat capacity of copper = 400JKg-1K-1
Latent heat of fusion of ice = 3.3 x 105JKg-1
Options:
A) 8/33kg
B) 33/80kg
C) 80/33kg
D) 33/8kg
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The correct answer is A .
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Question 588: For semi conductor to have negative temperature coefficient of resistance implies that
Options:
A) their resistance decrease with temperature
B) The resistance increase with temperature
C) their resistance is constantly changing with temperature
D) they have electrons and holes at high temperature
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The correct answer is A .
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Question 589: The difference between X-rays and gamma rays is that
Options:
A) x-rays are more penetrating than gamma rays
B) x-rays are electromagnetic radiations while gamma rays are negatively charged radiation
C) x-rays have higher frequencies than gamma rays
D) x-rays arise from energy changes in the electronic structure of atoms while gamma rays come from the nucleus
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The correct answer is D .
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Question 590: The relative densities of zinc, brass, copper, gold and silver are respectively 7.1, 8.5, 8.9, 19.3, 10.5. A metal ornament which weighs 0.425kg and can displace 50 x 10-6m3m of water is made of
Options:
A) zinc
B) brass
C) copper
D) gold
E) silver
Show Answer
The correct answer is B .