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 731:
Two horizontal forces, 10N and 8N and another force F1 inclined at 30 to the vertical acting as shown in the diagram above, keep the body P in equilibrium, The weight of the body is
Options:
A) 2√3/3N
B) √2N
C) 4√3/3
D) 2V3N
Show Answer
The correct answer is D .
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Question 732:
From the diagram above, calculate the total current in the circuit
Options:
A) 5.0A
B) 3.7A
C) 4.5A
D) 4.0A
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The correct answer is B .
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Question 733: The voltage of the domestic electric supply is represented by the equation V = 311 sin314.2t. Determine the frequency of the a.c. supply [ = 3.142]
Options:
A) 50.0Hz
B) 100.0Hz
C) 311.0Hz
D) 314.2Hz
Show Answer
The correct answer is A .
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Question 734:
Which of the following statements are TRUE of isotopes?
I. Isotopes of an element have the same chemical properties because they have the same number of electrons
II. Isotopes of elements are normally separated using physical properties
III. Isotopes of an element have the same number of protons in their nuclei
Options:
A) I and II only
B) I and III only
C) II and III only
D) I, II and III
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The correct answer is B .
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Question 735: A calorimeter of thermal capacity 80J contains 20g of water at 25oC. Water at 100oC is added so that the final temperature of the set-ups is 50oC. The amount of water added is (Heat capacity of water = 4.18J/g/oC)
Options:
A) 20g
B) 25g
C) 45g
D) 50g
E) 100g
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The correct answer is A .
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Question 736:
What is the average velocity of the sprinter whose velocity time graph is as shown above
Options:
A) 85.0ms-1
B) 17.0ms-1
C) 8.0ms-1
D) 1.7ms-1
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The correct answer is C .
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Question 737: The theory of electronic conduction in solids, which satisfactorily explains the properties of conductors, insulators and semi-conductor,is?
Options:
A) string theory
B) particle theory
C) group theory
D) band theory
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The correct answer is D .
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Question 738: A vehicle of mass m is driven by an engine of power P from rest. Find the minimum time it will take to acquire a speed
Options:
A)
B)
C)
D)
Show Answer
The correct answer is A .
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Question 739:
The motion of a body is simple harmonic if the?
Options:
A) acceleration is always directed towards a fixed point
B) path of motion is a straight line
C) acceleration is proportional to the square of the distance from a fixed point
D) acceleration is constant and directed towards a fixed point
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The correct answer is A .
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Question 740: A heating coil rated at 100W is used to boil off 0.5kg of boiling water. The time taken to boil off the water is [specific latent heat of vaporization of water = 2.3 x 106Jkg-1]
Options:
A) 1.15 x 109 s
B) 1.15 x 107 s
C) 1.15 x 105 s
D) 1.15 x 104 s
Show Answer
The correct answer is D .