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 551:
Calculate the heat energy required to vaporize 50g of water initially at 80ºCif the specific heat capacity of water is 4.23jgk (specific latent heat of vaporization of water is 2260jg
Options:
A) 530000J
B) 23200J
C) 17200J
D) 130000J
Show Answer
The correct answer is D .
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Question 552: In an ideal wheel an axle system, R stand for the radius of the wheel and r is the radius of the axle. the mechanical advantage is
Options:
A) (R/r)2
B) r/R
C) (r/R)2
D) R/r
Show Answer
The correct answer is D .
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Question 553: Which of the following are found in the receiver but not in the microphone of a telephone handset? i. Diaphragm. ii. soft iron pole pieces. iii. permanent magnet. iv.carbon blocks
Options:
A) i and ii
B) i and iv
C) ii and iii
D) iii and iv
Show Answer
The correct answer is B .
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Question 554: A machine of velocity ratio 6 requires an effort of 400 N to raise a load of 800 N through I m. Find the efficiency of the machine
Options:
A) 55. 6 %
B) 50.0%
C) 33.3%
D) 22.2%
Show Answer
The correct answer is C .
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Question 555: Which type of motion do the wheels of a moving car undergo?
Options:
A) Vibratory and translational motion
B) Random and translational motion
C) Rotational mand oscillatory motion
D) Translational and rotational motion
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The correct answer is D .
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Question 556:
Find the tension in the two cords shown in the figure above. Neglect the mass of the cords, and assume that the angle is 38° and the mass m is 220 kg
[Take g = 9.8 ms-2]
Options:
A) = 2864 N, = 3612 N
B) = 3612 N, = 2864 N
C) = 3502 N, = 2760 N
D) = 2760 N, = 3502 N
Show Answer
The correct answer is C .
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Question 557: If u is the object distance and v the image distance, which of the following expressions gives the linear magnification produced by a convex lens of focal length f?
Options:
A) u/f - f
B) u/v + f
C) v/f + 1
D) v/f - 1
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The correct answer is D .
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Question 558: At reasonance, the phase angle in an a.c. circuit is
Options:
A) 90°
B) 60°
C) 0°
D) 180°
Show Answer
The correct answer is C .
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Question 559:
A parallel plate capacitor separated by an air gap is made of tin plates and 20 mm apart. It is connected to 120 V battery. What is the charge on each plate?
Take =
Options:
A) 3.54nC
B) 42.5nC
C) 35.4nC
D) 4.25nC
Show Answer
The correct answer is B .
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Question 560: In what range of temperature is the expansion of water anomalous?
Options:
A) +208oC to +212oC
B) -80oC + -76oC
C) -4oC to 0oC
D) +96oC to +100oC
E) 0oC to +4oC
Show Answer
The correct answer is E .