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 121:
When three coplanar non-parallel are in equilibrium.i. they can be represented in magnitude and direction by the three sides of a triangle taken in order. ii. the lines of action meet at a point. iii. the magnitude of any one force equals the magnitude of the resultant of the other two forces. iv. any one force is the equivalent of the other two. Which of the following statements above are correct?
Options:
A) i and ii only
B) i and iii only
C) i, ii, iii, and iv
D) none of them
Show Answer
The correct answer is A .
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Question 122: Which of the following are the correct SI units of the quantities indicated? i.N(Force) II. Mn-1 (Torque) iii. watt(Power) iv. kgms-2
Options:
A) i and ii only
B) i, ii and iii only
C) i, ii, and iv only
D) i and iii only
Show Answer
The correct answer is D .
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Question 123: Which of the following is NOT directly associated with direct current (DC)?
Options:
A) A dry cell
B) a moving coil galvanometer
C) a transformer
D) a lead- acid accumulator
E) a commutator
Show Answer
The correct answer is C .
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Question 124: The velocity ratio of a machine is 5 and its efficiency is 75%. What effort would be needed to lift a load of 150N with the machine?
Options:
A) 20N
B) 30N
C) 40N
D) 50N
Show Answer
The correct answer is C .
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Question 125:
In a thermonuclear reaction, the total initial mass is 5.02 x 10-27kg and the total final mass is 0.01 x 10-27kg. The energy released in the process is
[c = 3.0 x 108ms-1]
Options:
A) 9.0 x 10-13J
B) 9.0 x 10-12J
C) 9.0 x 10-11J
D) 9.0 x 10-10J
Show Answer
The correct answer is A .
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Question 126: I Electrical potential, II Torque, III Kinetic Energy, IV Momentum. Which of the quantities listed are vectors?
Options:
A) II and IV
B) I and II
C) I and III
D) II and III
Show Answer
The correct answer is A .
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Question 127: The resistances of platinum wire at the ice and steam points are 0.75 ohm and 1.05 ohm respectively. Determine the temperature at which the resistance of the wire is 0.90 ohm
Options:
A) 43.0oC
B) 50.0oC
C) 69.9oC
D) 87.0oC
Show Answer
The correct answer is B .
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Question 128: A sonometer wire of length 100cm under a tension of 10N, has a frequency of 250Hz. Keeping the length of the wire constant, the tension is adjusted to produce a new frequency of 350Hz. The new tension is
Options:
A) 5.1N
B) 7.1N
C) 14.0N
D) 19.6N
Show Answer
The correct answer is D .
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Question 129: When a transformer has more secondary windings than primary windings, it
Options:
A) has a smaller secondary current
B) has a greater power output
C) is a step-down transformer
D) increases the total energy output
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The correct answer is C .
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Question 130: A high-resistance voltmeter reads 3.0V when connected across the terminals of a battery on open circuit and 2.6V when the battery supplies a current of 0.2A through a lamp. The resistance of lamp is
Options:
A) 2.00
B) 13.00
C) 0.52
D) 0.13
E) 1.50
Show Answer
The correct answer is B .