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 711:
Zener diode is used for?
Options:
A) current amplification
B) power amplification
C) voltage regulation
D) energy conversion
Show Answer
The correct answer is C .
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Question 712:
An object is acted upon by a system of parallel three causing the object to be in state equilibrium. Which of the following statement is not correct
Options:
A) the resultant of the parallel forces is zero
B) the algebraic sum of all the moments of the forces is zero
C) all the parallel forces must be equal in magnitude and direction
D) the sum of forces in one direction must be equal to the sum of forces in the opposite direction
Show Answer
The correct answer is C .
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Question 713: 200g of water at 90oC is mixed with 100g of water at 30oC. What is the final temperature?
Options:
A) 50oC
B) 60oC
C) 70oC
D) 80oC
Show Answer
The correct answer is C .
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Question 714: Which of the following is a semiconductor
Options:
A) copper
B) silicon
C) plastic
D) Iron
Show Answer
The correct answer is B .
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Question 715: At what frequency would a 10H inductor have a reactance of 2000Ω?
Options:
A) π/200Hz
B) π/100Hz
C) 100/πHz
D) 100πHz
Show Answer
The correct answer is C .
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Question 716: A boy in a barber's shop sits between two parallel mirrors. The number of images observed by him will be
Options:
A) Infinite
B) Ten
C) Eight
D) Forty
Show Answer
The correct answer is A .
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Question 717: A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid? [Density of the cork = 0.25 x 103kgm-3, Density of the liquid = 1.25 x 103kgm-3]
Options:
A) 0.8
B) 0.5
C) 0.2
D) 0.1
Show Answer
The correct answer is C .
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Question 718:
Which of the following may be used to determine relative humidity in a physics laboratory?
I. Manometer
II. Wet-and-dry bulb hygrometer
III. Hair hygrometer
IV. A hydrometer.
Options:
A) III only
B) I only
C) II only
D) II and III only
Show Answer
The correct answer is D .
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Question 719:
One newton × One meter equals?
Options:
A) One water
B) One Joule
C) One ampere
D) One kilogram
Show Answer
The correct answer is B .
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Question 720: A load of 5N gives an extension of 0.56cm in a wire which obeys Hooke's law. What is the extension caused by a load of 20N?
Options:
A) 1.12cm
B) 2.14cm
C) 2.24cm
D) 2.52cm
Show Answer
The correct answer is C .