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 391: The d.c generator has essentially the same components as the a.c generator except the presence of?
Options:
A) slip-ring
B) carbon brushes
C) split ring
D) armature
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The correct answer is C .
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Question 392:
In the circuit above, The potential across each capacitor is 100V. The total energy stored in the two capacitors is
Options:
A) 3.0 x 104J
B) 3.0 x 102J
C) 2.5 x 10-2J
D) 6.0 x 10-3J
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The correct answer is C .
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Question 393:
The conductivity of gases at low pressure can be termed as
I. hot cathode emission
II. thermo ionic emission
III. cold cathode emission
IV. Field emission
Options:
A) I and II
B) II and III
C) III and IV
D) IV and V
Show Answer
The correct answer is C .
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Question 394:
The effect of closing the key K in the circuit shown above would be to
Options:
A) increase the current by 0.6A
B) reduce the current by 0.6A
C) increase the current by 0.4A
D) keep the current unchanged
Show Answer
The correct answer is C .
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Question 395: A gramophone record takes 5s to reach its constant angular velocity of 4 rads-1 from rest. Find its constant angular acceleration.
Options:
A) 0.4 rads-2
B) 0.8 rads-2
C) 1.3 rads-2
D) 20.0 rads-2
Show Answer
The correct answer is B .
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Question 396:
The resultant capacitance in the figure above is
Options:
A) 0.4μf
B) 0.8μf
C) 1.8μf
D) 4.5μf
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The correct answer is B .
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Question 397: Isotopes are nuclei which have
Options:
A) the same number of nuetrons and electrons
B) equal number of electrons and protons
C) the same atomic number but different number of neutrons
D) the same number of total particles
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The correct answer is C .
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Question 398: Radio waves belong to the class of wave whose velocity is about
Options:
A) 34m/s
B) 3 ×106m/s
C) 3 ×108m/s
D) 3 × 10-8m/s
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The correct answer is C .
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Question 399:
The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is
Options:
A)
B)
C)
D)
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The correct answer is A .
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Question 400: Two metals P and Q of length l1 and l2 are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is 2:3 and the ratio of lengths is 3:4. What is the ratio of increase in length of P to Q?
Options:
A) 7:5
B) 5:7
C) 1:2
D) 2:1
Show Answer
The correct answer is C .