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 541: When a known standard resistor of 2 is connected to the 0.0cm end of a meter bridge, the balance point is found to be at 55.0cm. What is the value of the unknown resistor?
Options:
A) 1.10
B) 1.64
C) 2.44
D) 27.50
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The correct answer is B .
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Question 542:
The linear expansivityof brass is 2 x 10 . If the volume of piece of brass is 10cm at 0C. What will be its volume at 100C?
Options:
A) 10.06cm
B) 10.04 cm
C) 10.02 cm
D) 10.20 cm
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The correct answer is A .
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Question 543: Radio waves have a velocity of 3 x 108ms-1. A radio station sends out a broadcast on a frequency of 800kHz. The wavelength of the broadcast is
Options:
A) 375.0m
B) 267.0m
C) 240.0m
D) 37.5m
E) 26.7m
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The correct answer is A .
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Question 544:
The figure above shows 4 forces 3N, 10N, 3√3N and 6N acting on a particle P. The resultant of he four forces is
Options:
A) 5N
B) 5√ 3N
C) 10N
D) 10√ 3N
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The correct answer is C .
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Question 545: A vapour is said to be saturated when
Options:
A) a dynamic equilibrium exists between liquid molecules and the vapour molecules
B) a dynamic aquilibrium exists such that more molecules return to the liquid than are living it
C) the temperature of the vapour varies
D) the vapour pressure is atmospheric
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The correct answer is A .
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Question 546: Which of the following statements describes an atom accurately? i. atoms of all elements are identical ii. an atom contains a nucleus and number of electrons iii. due to the electrons in the atom an atom is negatively charged iv. electrons in the atom move in circular orbits round the nucleus
Options:
A) i and ii
B) ii and iii
C) iii and iv
D) ii and iv only
E) i,ii and iii
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The correct answer is D .
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Question 547: If the refractive index of a medium is V2, what is the critical angle?
Options:
A) 45o
B) 50o12'
C) 56o25'
D) 75o
E) 90o
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The correct answer is A .
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Question 548: Total internal reflection will not occur when light travels from
Options:
A) water to air
B) water into glass
C) glass to air
D) glass into water
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The correct answer is B .
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Question 549:
PQ is a thin rod on a horizontal table, RS is a plane mirror inclined at to the horizontal as shown above. The image of PQ as seen in the mirror by the eye T is
Options:
A) horizontal
B) parallel to the mirror
C) at infinity
D) vertical
E) highly magnified
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The correct answer is B .
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Question 550: An elevator of mass 4800kg is supported by a cable which can safely withstand a maximum tension of 60 000N. The maximum upward acceleration the elevator can have is
Options:
A) 2.5ms-2
B) 5.0ms-2
C) 7.5ms-2
D) 10.0ms-2
Show Answer
The correct answer is A .