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 661:
The effect of closing the key K in the circuit shown in the figure above would be to?
Options:
A) increase the current by 0.4A
B) reduce the current by 0.4A
C) increase the current by 0.6A
D) reduce the current by 0.6A
Show Answer
The correct answer is A .
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Question 662: Total internal reflection occurs when light moves from
Options:
A) a dense medium to a less dense medium
B) air to water
C) water to glass
D) a less dense to a dense medium
Show Answer
The correct answer is A .
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Question 663: What is the best method of demagnetizing a steel bar magnet?
Options:
A) Hammering
B) Heating it
C) Rough handling it
D) Solenoid method
Show Answer
The correct answer is D .
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Question 664:
A man stands one-third of the way between two walls and claps his hands. He hears two distinct echoes 1s apart. If the speed of sound is 330ms-1, the distance between the wall is
Options:
A) 33m
B) 110m
C) 220m
D) 330m
E) 495m
Show Answer
The correct answer is D .
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Question 665:
In the molecular explanation, heat is transferred by the
Options:
A) free electrons
B) free atoms
C) free molecules
D) free solids
Show Answer
The correct answer is A .
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Question 666: The surfaces of conveyor belts are made rough so as to
Options:
A) protect them while carrying loads
B) prevent the loads from slipping
C) enable them to carry more load
D) make them stronger
Show Answer
The correct answer is B .
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Question 667:
The frequency of the wave in the diagram above is
Options:
A) 0.17 Hz
B) 0.25 Hz
C) 1.57 Hz
D) 1.05 Hz
Show Answer
The correct answer is B .
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Question 668: When a sound wave passes from air into water its
Options:
A) speed and frequency increases but its wavelength remains the same
B) speed and wavelength increases but its frequency remains the same
C) speed decreases
D) speed remains the same but its frequency and wavelength change
E) speed increases but its frequency and wavelength decreases
Show Answer
The correct answer is C .
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Question 669:
If it takes 5.0 hrs to drain a container of 540.0cm3 of water, what is the flow rate of water from the container in kg-1? [Density of water = 1000kgm-3]
Options:
A) 32.5kg-1 s
B) 31.5kg-1 s
C) 30.8kg-1 s
D) 30.0kg-1 s
Show Answer
The correct answer is D .
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Question 670:
Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss (specific heat capacity of copper = 400Jkgk, latent heat of fusion of ice = 3.3 x 10Jkg)
Options:
A) kg
B) kg
C) kg
D) kg
Show Answer
The correct answer is A .