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 451: Which of the following symbolic representations is correct for an atom X with 22 electrons and 43 neutrons?
Options:
A)
B)
C)
D)
Show Answer
The correct answer is D .
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Question 452: When a red rose flower is observed in blue light, what colour does the observer see?
Options:
A) Red
B) Blue
C) Magenta
D) yellow
E) No correct option
Show Answer
The correct answer is E .
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Question 453:
The total power drawn from the cell in the circuit above is
Note: The cell voltage is 12V and all three resistors are 4 ohm resistors.
Options:
A) 12W
B) 24W
C) 32W
D) 40W
Show Answer
The correct answer is B .
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Question 454:
I. The frictional force is independent of the area of the surfaces in conduct
II. The frictional force depends on the nature of the surfaces in contact
III. The frictional force depends on the speed of sliding
IV. The frictional force is directly proportional to the normal reaction.Which combination of the above is true of sliding friction?
Options:
A) I, III and IV
B) I, II and IV
C) I, II and III
D) II, III and IV
Show Answer
The correct answer is B .
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Question 455: A 40-W instrument has a resistance of 90. On what voltage should it be operated normally?
Options:
A) 60V
B) 150V
C) 225V
D) 3600V
Show Answer
The correct answer is A .
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Question 456: An air force jet flying with a speed of 335ms-1 went past an anti-aircraft gun. How far is the aircraft 5s later when the gun was fired?
Options:
A) 838m
B) 3350m
C) 670m
D) 1675m
E) 67m
Show Answer
The correct answer is D .
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Question 457:
What is the reading of the vernier calipers shown above?
Options:
A) 1.79cm
B) 1.73cm
C) 1.39cm
D) 1.34cm
Show Answer
The correct answer is C .
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Question 458: The most suitable cell used for short interval switches in electric bells is a
Options:
A) lead- acid accumulator
B) Daniel cell
C) Leclanche cell
D) nickel iron accumulator
Show Answer
The correct answer is C .
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Question 459: An object is placed 5 cm from the pole of a concave mirror. if the focal length of the mirror is 10 cm. what is the image distance?
Options:
A) 10 cm in front of the mirror.
B) 5 cm in front of the mirror
C) 10 cm behind the mirror
D) 5 cm behind the mirror
Show Answer
The correct answer is C .
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Question 460: Three resistors, with substances 250, 500 and 1k are connected in series. A 6V battery is connected to either end of the combination. Calculate the pot3ential difference between the end of the 250 resistor.
Options:
A) 0.20V
B) 0.86V
C) 1.71V
D) 3.43V
Show Answer
The correct answer is B .