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 341: A boy timed 30 oscillations of a certain pendulum thrice and obtained 1min. 10s, 1min. 12s and 1min. 7s respectively.The mean period of oscillation of the pendulum is
Options:
A) 0.14s
B) 0.43s
C) 2.32s
D) 6.97s
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The correct answer is C .
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Question 342: Capacitors are used in the induction coil to
Options:
A) control circuits
B) prevent distortion of electric fields
C) prevent electric sparks
D) dissipate energy
Show Answer
The correct answer is C .
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Question 343:
Which of the following statements are TRUE of isotopes?
I. Isotopes of an element have the same chemical properties because they have the same number of electrons
II. Isotopes of elements are normally separated using physical properties
III. Isotopes of an element have the same number of protons in their nuclei
Options:
A) I and II only
B) I and III only
C) II and III only
D) I, II and III
Show Answer
The correct answer is B .
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Question 344:
When a water droplet is placed on a freshly cut piece of wood, it spreads out to form a thin layer because the wood is
Options:
A) not at equilibrium with the water
B) cohesive to water
C) at equilibrium with the water
D) adhesive to water
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The correct answer is D .
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Question 345:
During the nuclear reaction described by
The particles emitted are respectively
Options:
A) α and α
B) α and β
C) β and β
D) β and α
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The correct answer is D .
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Question 346: In the process of electrification by induction, the amount of induced charge in relation to the inducing charge is the
Options:
A) same in sign and quantity
B) same in sign but greater
C) opposite in sign but greater
D) opposite in sign but less
E) opposite in sign but equal
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The correct answer is E .
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Question 347:
In the diagram above, the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static friction between the mass m1 and the table is
Options:
A) m1/m2
B) m1g/m2
C) m2/m1
D) m2g/m1
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The correct answer is C .
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Question 348:
A magnet relay is a device used for?
Options:
A) reading the magnitude of magnetic flux
B) controlling another circuit carrying larger current
C) turning in sports
D) storing magnetic field
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The correct answer is B .
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Question 349:
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 350:
Which of the following figures gives the correct resultant R of two vectors P and Q?
Options:
A) I
B) II
C) III
D) IV
E) V
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The correct answer is D .