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 431: A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260Hz and the wavelength is 1.29m, how far away is the hill?
Options:
A) 330.0m
B) 335.4m
C) 660.0m
D) 670.8m
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The correct answer is B .
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Question 432: In which of the following are the substance arranged in descending order of their thermal conductivities?
Options:
A) copper, steel, glass
B) steel, copper, glass
C) steel, glass, copper
D) copper, glass, steel
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The correct answer is A .
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Question 433: When a ship sails from salt water into fresh water, the fraction of its volume above the water surface will
Options:
A) increase
B) decrease
C) remain the same
D) increase then decrease
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The correct answer is B .
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Question 434:
The diagram above represents balls in an undulating surface. Which of the following option represents positions of stable equilibrium?
Options:
A) III, IV and VIII
B) II, V and VIII
C) III, VI and IX
D) I, IV and VII
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The correct answer is C .
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Question 435:
If the fraction of the atoms of a radioactive material left after 120 years is 1/64, what is the half-life of the material?
Options:
A) 24 years
B) 20 years
C) 10 years
D) 2 years
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The correct answer is B .
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Question 436:
A few grains of table salt were put in a cup of cold water, kept at constant temperature and left undistributed. Eventually all the water tested salty. This action isdue to?
Options:
A) convection
B) osmosis
C) capillarity
D) diffusion
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The correct answer is D .
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Question 437: The normal temperature of human body is record at what ranges?
Options:
A) 27°C to 43°C
B) 30°C to 40°
C) 98.4°C only
D) Between 35°C to 37°C
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The correct answer is D .
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Question 438: The purpose of a dielectric material in a parallel plate capacitor is to
Options:
A) increase its capacitance
B) decrease its capacitance
C) insulate the plate from each other
D) increase the magnetic field between the plates
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The correct answer is C .
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Question 439: Two charged particles are projected into a region where there is a magnetic field perpendicular to their velocities. if the charges are deflected in opposite directions, which of the following statements is true of the charge?
Options:
A) the charge must be of opposite sign
B) positive charges are more in number
C) the charges are electrically neutral
D) the charges are of the same sign
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The correct answer is A .
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Question 440: A certain radioactive source emits radiations that were found to be deflected by both magnetic and electric fields. The radiations are
Options:
A) beta rays
B) gamma rays
C) x-rays
D) unltr-violet rays
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The correct answer is A .