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 321:
A cell can supply current of 0.4 A and 0.2 A through a 4.0Ω and 10.0Ω resistors respectively.
This internal resistance of the cell is
Options:
A) 2.0Ω
B) 1.0Ω
C) 2.5Ω
D) 1.5Ω
Show Answer
The correct answer is A .
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Question 322: Two lamps are rated 40W and 220V each are connected in series. The total power dissipated in both lamps is
Options:
A) 10W
B) 20W
C) 40W
D) 80W
E) None of the above
Show Answer
The correct answer is D .
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Question 323: A magnet is moved through a coil of wire. The e.m.f. produced in the wire depends on
Options:
A) the number of turns in the coil
B) the strength of the magnet
C) the speed at which the magnet is moved
D) all of the above
E) none of the above
Show Answer
The correct answer is D .
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Question 324:
The equilibrium position of objects in any field corresponds to situation of
Options:
A) equipotential energy
B) maximum potential energy
C) minimum potential energy
D) maximum kinetic energy
Show Answer
The correct answer is C .
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Question 325: Four cells each of e.m.f 1.5V and internal resistance of 4Ω are connected in parallel. What is the effective e.m.f. and internal resistance of the combination?
Options:
A) 6.0V, 16Ω
B) 6.0V, 1Ω
C) 1.5V, 4Ω
D) 1.5V, 1Ω
Show Answer
The correct answer is D .
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Question 326: A man stands 4m in front of a plane mirror. If the mirror is moved 1m towards the man, the distance between him and his new image is
Options:
A) 3m
B) 5m
C) 6m
D) 10m
Show Answer
The correct answer is C .
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Question 327: The resultant force of a couple is ………?
Options:
A) Infinity
B) Zero
C) One
D) Half
Show Answer
The correct answer is B .
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Question 328: Heat is supplied to a test tube containing 100g of ice at its melting point. The ice melts completely in 1 min.What is the power rating of the source of heat? [Latent heat of fusion of ice = 336Jg-1]
Options:
A) 336W
B) 450W
C) 560W
D) 600W
Show Answer
The correct answer is C .
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Question 329: In a projection lantern of focal length f, the object distance u, is such that
Options:
A) u > 2f > f
B) u < f < 2f
C) u = f < 2f
D) f < u < 2f
Show Answer
The correct answer is D .
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Question 330:
A convex mirror is used as a driving mirror because
I. its image is erect
II. It has a large field of view
III. It has a long focal length
Identify the CORRECT statement(s)
Options:
A) I and III only
B) I and II only
C) II and IIII only
D) I, II and III only
Show Answer
The correct answer is B .