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 511: Which of the following statements is NOT true? Thermostats are used to control the temperature of
Options:
A) pressure cookers
B) laundry irons
C) hot water storage tanks
D) aquaria for tropical fish
E) heated apartments
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The correct answer is A .
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Question 512: The velocities of light in air and glass are 3.0 x 108ms-1 and 2.0 x 108ms-1 respectively. If the angle of refraction is 30°, the sine of the angle of incidence is
Options:
A) 0.33
B) 0.50
C) 0.67
D) 0.75
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The correct answer is D .
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Question 513:
The figure above shows a block of mass m sliding down a rough inclined plane QP at angle . The forces acting on the block along QP are
Options:
A) mg sinθ and the normal reaction
B) mg sinθ and the force of friction
C) mg sinθ and the normal reaction
D) mg cosθ and the normal reaction
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The correct answer is B .
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Question 514: For correcting long sight defects in the human eye we require a
Options:
A) converging lens
B) diverging lens
C) microscope
D) periscope
E) plain glass sheet
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The correct answer is A .
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Question 515: As the pressure of a fluid increases, its viscosity
Options:
A) decreases
B) increases
C) increases then decreases
D) remains constant
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The correct answer is B .
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Question 516: The distance between two successive crests of a wave is 15cm and the velocity 300ms-1. Calculate the frequency.
Options:
A) 2.0x102Hz
B) 4.5x103Hz
C) 2.0x103Hz
D) 4.5x102Hz
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The correct answer is C .
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Question 517:
When water is boiling, it
Options:
A) gets hotter
B) increase is mass
C) decreases in mass
D) changes to steam
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The correct answer is D .
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Question 518: Which of the following can conduct electricity owing to the presence of free mobile electrons?
Options:
A) germanium
B) silicon
C) grapefruit
D) copper
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The correct answer is D .
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Question 519: Which of the following statements is NOT correct?
Options:
A) Molecules of a liquid are stationary
B) Brownian motion is an evidence of particle nature of matter
C) Matter is made up of molecules
D) The molecules of matter are in constant motion
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The correct answer is A .
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Question 520: The lower and upper fixed points marked on a mecury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?
Options:
A) 55.3oC
B) 23.3oC
C) 49.0oC
D) 16.1oC
E) 76.7oC
Show Answer
The correct answer is B .