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 311: Two bodies have masses in the ratio 3:1. They experience forces which impart to them acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced.
Options:
A) 1 : 4
B) 2 : 1
C) 2 : 3
D) 2 : 5
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The correct answer is C .
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Question 312: Before starting a journey, the tyre pressure of a car was 3 x 105Nm-2 at 27oC. At the end of the journey, the pressure rose to 4 x 105Nm-2. Calculate the temperature of the tyre after the journey, assuming the volume is constant
Options:
A) 400oC
B) 300oC
C) 273oC
D) 127oC
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The correct answer is D .
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Question 313:
A sonometer wire is vibrating at frequency fo. If the tension in the wire is doubted while the length and the mass per unit length are kept constant, the new frequency of vibration is
Options:
A) fo/2
B) 2fo
C) fo/√2
D) fo√2
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The correct answer is D .
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Question 314: Three resistors, with substances 250, 500 and 1k are connected in series. A 6V battery is connected to either end of the combination. Calculate the pot3ential difference between the end of the 250 resistor.
Options:
A) 0.20V
B) 0.86V
C) 1.71V
D) 3.43V
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The correct answer is B .
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Question 315:
0.5kg of water at 10ºC is completely converted to ice at 0ºC by extracting (88000) of heat from it. If the specific heat capacity of water is 4200jkg Cº. Calculate the specific latent heat of fusion of ice.
Options:
A) 9.0kjkg
B) 84.0kjkg
C) 134.0kjkg
D) 168.0kjkg
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The correct answer is C .
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Question 316: 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 317:
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 318: An empty 60 litre petrol tank has a mass of 10kg. Its mass when full of fuel of relative density 0.72 is
Options:
A) 7.2kg
B) 33.2kg
C) 43.2kg
D) 53.2kg
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The correct answer is D .
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Question 319: From the generating station to each substation power is transmitted at a very high voltage so as to reduce
Options:
A) hysteresis loss
B) eddy current loss
C) magnetic flux leakage
D) heating in the cells
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The correct answer is B .
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Question 320: A plane sound wave of frequency 85.5Hz and velocity 342ms-1 is reflected from a vertical wall. At what distance from the wall does the wave have antinode?
Options:
A) 2m
B) 4m
C) 1m
D) 3m
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The correct answer is C .