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 491: The displacement d produced in a glass block of thickness t and refractive index n when an object is viewed through it is
Options:
A) t – n
B) t (1 + 1/n)
C) t (1-1/n)
D) t (1/n - 1)
Show Answer
The correct answer is C .
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Question 492: Which of the following electromagnetic waves is least energetic?
Options:
A) Infra-red rays
B) X-rays
C) Ultra-violet rays
D) Gamma rays
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The correct answer is A .
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Question 493: 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
Show Answer
The correct answer is D .
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Question 494:
The pinhole camera works on
Options:
A) the principle of the reversibility of light
B) the principle of the rectilinear propagation of light
C) Huygen’s principle
D) the principle of total internal reflection of light
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The correct answer is B .
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Question 495: A p-n junction diode is used as?
Options:
A) a rectifier in a d.c circuit
B) an amplifier in d.c circuit
C) an anplifier in an a.c circuit
D) a rectifier in an a.c circuit
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The correct answer is D .
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Question 496: The dimension of universal gravitational constant is……….?
Options:
A)
B) ML3T2
C) ML3
D) MLT-2
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The correct answer is A .
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Question 497: A steady current of 2A flows in a coil of emf 12V for 0.4s. A back emf of 3V was induced during this period. The stored energy in the loop that can be utilized is
Options:
A) 9.6J
B) 2.4J
C) 12.0J
D) 7.2J
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The correct answer is B .
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Question 498: A lens of focal length 12.0cm forms an upright image three times the size of a real object. The distance between the object and the images is
Options:
A) 8.0cm
B) 16.0cm
C) 24.0cm
D) 32.0cm
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The correct answer is D .
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Question 499: If the angle between two vector P and Q is Oo, the vectors are said to
Options:
A) intersect at the angle 45o
B) intersect at the angle 60o
C) be parallel
D) be perpendicular
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The correct answer is C .
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Question 500:
If a force of 50N stretches a wire from 20m to 20.01m, what is the amount of force required to stretch the same material from 20m to 20.05m?
Options:
A) 250N
B) 200N
C) 100N
D) 50N
Show Answer
The correct answer is A .