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 501:
During the transformation of matter from the solid to the liquid state, the heat supplied does not produce temperature increase because
Options:
A) all the heat is used to break the bonds holding the molecules of the solid together
B) the heat capacity has become very large as the substance melts
C) the heat energy is quickly conducted away
D) the heat gained is equal to the heat lost by the substance
Show Answer
The correct answer is A .
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Question 502: An example of a scalar quantity is
Options:
A) velocity
B) weight
C) electric charge
D) acceleration due to gravity
E) momentum
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The correct answer is C .
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Question 503:
The volume of 0.354g of helium at 273°C and 114cm of mercury pressure is 2667cm. Calculate the volume
Options:
A) 2000.25 cm
B) 200.025 cm
C) 4003.27 cm
D) 2010.25 cm
Show Answer
The correct answer is B .
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Question 504: Heat transfer by convection will take place is one the following substance.
Options:
A) Stone
B) Wood
C) Mercury
D) Water
Show Answer
The correct answer is D .
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Question 505:
When the downward current flows in a straight vertical conductor, the direction of its magnetic field at a point due north of the wire is
Options:
A) Upward
B) North
C) South
D) West
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The correct answer is D .
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Question 506:
When the temperature of a liquid increases,its surface tension
Options:
A) decreases
B) increases
C) remains constant
D) increases then decreases
Show Answer
The correct answer is A .
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Question 507: Which of the following machines does NOT apply the lever principle?
Options:
A) claw hammer
B) wheel barrow
C) single moving pulley
D) sugartongs
E) nutcrackers
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The correct answer is C .
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Question 508: When the r.m.s value of a source of electricity supply is given as 240v, it means that the peak value of the supply is
Options:
A) 240v
B) 340v
C) 480v
D) 57600v
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The correct answer is B .
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Question 509: Calculate the work done when a force of 20N stretches a spring by 50mm.
Options:
A) 0.5J
B) 1.5J
C) 2.0J
D) 2.5J
Show Answer
The correct answer is A .
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Question 510: Which of the following statements are correct about an object in equilibrium under parallel forces? i. the total clockwise moments of the forces about any point equals the total anti-clockwise moments about the same point. ii. the total forces in one direction equals the total forces in the opposite direction. iii. the resolved components along the x-axis equals the resolved components along the y-axis.
Options:
A) i and ii only
B) i and iii only
C) ii and iii
D) i, ii, and iii only
Show Answer
The correct answer is A .