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 1221: Which of the following surfaces will absorbs radiant heat energy heat?
Options:
A) white
B) red
C) black
D) blue
Show Answer
The correct answer is C .
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Question 1222: In the study of physics, temperature and heat are often confused with each other. Which of the following statements correctly defines these two element?
Options:
A) temperature is a measure of the average kinetic energy of the molecules of a substance
B) heat is a measure of the total kinetic energy of the molecules in a system
C) different materials require different amounts of heat to cause a given change in temperature
D) all of the above
E) A and B only
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The correct answer is D .
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Question 1223:

Fig 12 above shows the velocity time graph of a car which starts from rest and is accelerated uniformly at the rate of 3m sec-2 for 5 seconds. It attains a velocity which is maintained for a minute, The car is then brought to rest by a uniform retardation after another 3 seconds. calculate the total distance covered
Options:
A) 900m
B) 1920m
C) 960m
D) 860m
Show Answer
The correct answer is C .
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Question 1224: The force with which an object is attracted to the earth is called its
Options:
A) acceleration
B) mass
C) gravity
D) impulse
E) weight
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The correct answer is E .
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Question 1225: Which of the following is a pure semiconductor?
Options:
A) carbon
B) silicon
C) transistor
D) phosphorus
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The correct answer is B .
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Question 1226: A tap supplies water at 25oC while another supplies water at 75oC. If a man wishes to bathe with water at 40oC, the ratio of the mass of cold water to the mass of hot water required is
Options:
A) 1 : 3
B) 15 : 8
C) 7 : 3
D) 3 : 1
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The correct answer is C .
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Question 1227: The combination of sound waves with different frequencies is known as
Options:
A) interference
B) diffraction
C) superposition
D) forced vibration
E) resonance
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The correct answer is C .
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Question 1228: The electrochemical equivalent of silver is 0.0012gC-1. If 36.0g of silver is to be deposited by electrolysis on a surface by passing a steady current for 5.0mins, the current must be
Options:
A) 6000A
B) 100A
C) 10A
D) 1A
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The correct answer is B .
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Question 1229: If the normal atmospheric pressure in a laboratory supports a column of mercury 0.76m high and the relative density of mercury is 13.8, then the height of water column which atmospheric pressure will support in the same laboratory at the same time is
Options:
A) 0m
B) 10m
C) 13m
D) 14m
E) 18m
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The correct answer is B .
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Question 1230: A light wave of frequency 5 x 1014Hz moves through water which has a refractive index of . Calculate the wavelength in water if the velocity of light in air is 3 x 108ms-1
Options:
A) 4.5 x 10-7m
B) 6.0 x 10-7m
C) 1.7 x 106m
D) 2.2 x 106m
Show Answer
The correct answer is A .