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 741: The external and internal diameter of a tube are measured as (32 ± 2)mm and (21 ± 1)mm respectively. Determine the percentage error in the thickness of the tube.
Options:
A) 27%
B) 14%
C) 9%
D) 3%
Show Answer
The correct answer is C .
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Question 742: A stand-by generator is connected to fifteen 40 W lamps and musician's 600 W amplifying system. How much energy is used if the generator runs for 6 hours?
Options:
A) 3.84k Wh
B) 7.20k Wh
C) 8.40k Wh
D) 12.00k Wh
E) 14.56k Wh
Show Answer
The correct answer is B .
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Question 743: A certain radioisotope of emits four alpha particles and three beta particles. The mass number and the atomic number of the resulting elements respectively are
Options:
A) 219 and 87
B) 84 and 223
C) 223 and 87
D) 219 and 81
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The correct answer is A .
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Question 744: Two metals P and Q of length l1 and l2 are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is 2:3 and the ratio of lengths is 3:4. What is the ratio of increase in length of P to Q?
Options:
A) 7:5
B) 5:7
C) 1:2
D) 2:1
Show Answer
The correct answer is C .
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Question 745: What charge is stored in a 0.1F capacitor when a 10V supply is connected across it?
Options:
A) 1C
B) 5C
C) 4C
D) 2C
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The correct answer is A .
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Question 746:
The relationship between the coefficient of linear expansion and volumetric expansion () is-----------------
Options:
A) =
B) =
C) 3
D) =
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The correct answer is C .
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Question 747: An electric lamp marked 240v, 60 W is left to operate for an hour. How much energy is generated by the filament?
Options:
A) 3.86 x 105J
B) 3.56 x 105J
C) 1.80 x 104J
D) 2.16 x 105J
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The correct answer is D .
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Question 748:
I. Diameter of a small ball bearing.
II. Thickness of a pieces of paper.
III. Diameter of a measuring cylinder.
IV. Length of a piece of wire.
Which of the above can be measured using a micrometer screw gauge?
Options:
A) I, II and IV only .
B) I and II only
C) II and III only
D) III and IV only
Show Answer
The correct answer is B .
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Question 749: A 50W electric heater is used to heat a metal block of mass 5kg. If in 10 minutes a temperature rise of 12oC is achieved, the specific heat capacity of the metal is
Options:
A) 400 J kg-1K-1
B) 500 J kg-1K-1
C) 390 J kg-1K-1
D) 130 J kg-1K-1
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The correct answer is B .
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Question 750: The process whereby a liquid turns spontaneously into vapour is called?
Options:
A) regelation
B) sublimation
C) boiling
D) evaporation
Show Answer
The correct answer is D .