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 251: A wire of 5Ω resistance is drawn out so that its new length is two times the original length. If the resistivity of the wire remains the same and the cross-sectional area is halved, the new resistance is
Options:
A) 40Ω
B) 20Ω
C) 10Ω
D) 5Ω
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The correct answer is B .
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Question 252: The internationally agreed system of units(SI) for physical measurements are
Options:
A) Ib, ft, sec
B) g, m, sec
C) kg, m, sec
D) cm, g, sec
E) kg, cm, sec
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The correct answer is C .
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Question 253: Calculate the work done when a force of 20N stretches a spring by 50mm.
Options:
A) 0.5J
B) 1.5J
C) 2.0J
D) 2.5J
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The correct answer is A .
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Question 254: On which of the following does the operation of a moving coil ammeter depend? i. Electromagnetic induction ii. Force on a carrying-current conductor iii. Magnetic effect of an electric current
Options:
A) i only
B) ii only
C) iii only
D) ii and iii only
E) i,ii and iii
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The correct answer is B .
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Question 255:
The diagram above represents the stress-strain graph of a loaded wire. Which of these statements is correct?
Options:
A) At J, the wire becomes plastic
B) J is the yield point
C) L is the elastic limit
D) At K, the wire breaks
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The correct answer is B .
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Question 256: A wire P has half the diameter and half the length of a wire Q of similar material. The ratio of the resistance of P to that of Q is
Options:
A) 8 : 1
B) 4 : 1
C) 2 : 1
D) 1 : 1
E) 1 : 4
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The correct answer is C .
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Question 257: The relationship between L and the wavelength I of the stationary wave is
Options:
A) 2L =
B) L =
C) L =
D) 4L = 3
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The correct answer is D .
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Question 258: A conductor has a diameter of 1.00 mm and length 2.00m. if the resistance of the material is 0.1Ω, its resistivity is?
Options:
A) 2.55 x 105 Ωm
B) 2.55 x 102 Ωm
C) 3.93 x 10-6 Ωm
D) 3.93 x 10-8 Ωm
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The correct answer is D .
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Question 259: A ray of light is incident at an angle of 30o on one top surface of a parallel-sided glass block of refractive index 1.5. The ray finally emerges from the lower surface. What is the angular deviation of the emergent ray?
Options:
A) 60o
B) 39o
C) 28o
D) 0o
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The correct answer is D .
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Question 260:
In the AC circuit diagram above, the resonance frequency is
Options:
A) 5000π Hz
B) 2500π Hz
C) 5000/π Hz
D) 2500/π Hz
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The correct answer is D .