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 1591:
A certain manufacturer wishes to make an n-type semiconductor. Which materials would he select for doping?
Options:
A) boron and antimony
B) aluminium and antimony
C) aluminium and indium
D) arsenic and antimony
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The correct answer is D .
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Question 1592: When taking a penalty kick, a footballer applies a force of 30.0N for a period of 0.05s. if the mass of the ball is 0.075kg, calculate the speed with which the ball moves off.
Options:
A) 4.50ms-1
B) 11.25ms-1
C) 20.00ms-1
D) 45.00ms-1
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The correct answer is C .
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Question 1593: A man exerts a pressure of 2.8 x 103Nm-2 on the ground and has 4 x 10-2m2 of his feet in contact with the ground. The weight of the man is
Options:
A) 102N
B) 70N
C) 140N
D) 112N
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The correct answer is D .
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Question 1594: A substance has a half of 3mins. after 6mins. the count rate was observed to be 400. What was its count rate at zero time?
Options:
A) 200
B) 1200
C) 1600
D) 2400
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The correct answer is C .
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Question 1595: When a number of identical small magnets are arranged in a line, the strength of the resultant magnet
Options:
A) ia largest when they are arranged end to end
B) is greatest when they are arrangedparallel with like poles adjacent to each other
C) depends only on the number of magnets provided they arev parallel
D) is greater when the magnets are arranged on a wooden surface than on a metaln surface
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The correct answer is A .
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Question 1596:
I. Coherence
II. Same frequency
III. Same wavelength
IV. Same Intensity
Which of the conditions above are necessary to produce interference fringes?
Options:
A) I and III
B) I, II and IV
C) I, II and III
D) II and III
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The correct answer is C .
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Question 1597:
A single force which produces the same effect as a set of forces acting together at a point is known as the
Options:
A) component
B) equilibrant
C) resultant
D) resistant
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The correct answer is C .
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Question 1598:
If the time of flight is 96seconds, calculate the horizontal range through the point of projection.
Options:
A) 84400m
B) 69000m
C) 61440m
D) 24000m
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The correct answer is C .
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Question 1599: A vibrator of frequency 60Hz is used in generating transverse stationary waves in a long thin wire, If the average distance between successive nodes on the wire is 45cm, find the speed of the transverse waves in the wire.
Options:
A) 27ms-1
B) 54ms-1
C) 90ms-1
D) 108ms-1
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The correct answer is A .
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Question 1600: Which of the following are produced after a nuclear fusion process? i. one heavy nucleus. ii. neutrons-1. iii. protons. iv. Energy.
Options:
A) i and ii
B) i and iv
C) ii and iii
D) ii and iv
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The correct answer is B .