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 441: Which of the following is a pure semiconductor?
Options:
A) carbon
B) silicon
C) transistor
D) phosphorus
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The correct answer is B .
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Question 442:
If the stress on a wire is 10NM and the wire is stretched from its original length of 10.00m to 10.05m. The young'smodulus of the wire is?
Options:
A) 5.0 x 10Nm
B) 5.0 x 10Nm
C) 2.0 x 10Nm
D) 2.0 x 10Nm
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The correct answer is D .
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Question 443: When a resistance R is across a cell, the voltage across the terminals of the cell is reduced to two-third of its normal value. The internal resistance of the cell is
Options:
A) R
B) R
C) R
D) 5R
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The correct answer is B .
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Question 444: The mode of heat transfer which does not require a material medium is
Options:
A) conduction
B) radiation
C) convection
D) propagation
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The correct answer is B .
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Question 445: An object is placed 10m from a pinhole camera of length 25cm. Calculate the linear magnification.
Options:
A) 2.5x102
B) 2.5x10-2
C) 2.5x10-1
D) 2.5x101
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The correct answer is B .
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Question 446:
Which of the following is/are not true about the heat capacity of a substance?
(i) It is an intensive property
(ii) Its S.I unit is
(iii) It is an extensive property
(iv) Its S.I unit is
Options:
A) (i) and (iii) only
B) (i), (ii) and (iv) only
C) (i) and (iv) only
D) (ii) and (iii) only
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The correct answer is C .
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Question 447: A ball is moving at 18ms-1 in a direction inclined at 60o to the horizontal. The horizontal component to its velocity is
Options:
A) 9√3ms-1 ·
B) 6√3ms-1 ·
C) 8√3ms-1 ·
D) 9ms-1 ·
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The correct answer is D .
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Question 448: The ability of the human eye to focus object on the retina is referred to as the power of
Options:
A) interference
B) diffraction
C) accomodation
D) superposition
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The correct answer is C .
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Question 449: A rocket burns fuel at the rate of 10kgs-1 and ejects it with velocity of 5 x 103ms-1. The thrust exerted by the gas on the rock is
Options:
A) 2.5 x 107N
B) 5.0 x 104N
C) 5.0 x 102N
D) 2.0 x 10-3N
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The correct answer is B .
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Question 450: The thermometric properties of the thermocouple is that is
Options:
A) e.m.f. changes with temperature
B) resistance changes with temperature
C) volume changes with temperature
D) pressure changes with resistance
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The correct answer is A .