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 291: A current of 0.5 A flowing 3h Deposits 2g of metal during electrolysis. The quantity of the same metal that would be deposited by the currents of 1.5A flowing in 1h is
Options:
A) 2g
B) 6g
C) 10g
D) 18g
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The correct answer is A .
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Question 292: If a room is saturated with water vapour, the temperature of the room must be
Options:
A) at 0oC
B) above the dew point
C) at 100oC
D) below or at the dew point
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The correct answer is D .
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Question 293: The total length of a spring when a mass of 20g is hung from its end is 14cm, while its total length is 16cm when a mass of 30g is hung from the same end. Calculate the unstretched length of the spring assuming Hooke's law is obeyed.
Options:
A) 9.33cm
B) 10.00cm
C) 10.66cm
D) 12.00cm
E) 15.00cm
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The correct answer is B .
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Question 294: The sharpness of the boundary of the shadow of an object is determined by the
Options:
A) intensity of light striking the object
B) rays of light passing through the object
C) nature of the object
D) opacity of the object
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The correct answer is B .
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Question 295: The pitch of a sound note depends on
Options:
A) timbre
B) frequency
C) harmonics
D) quality
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The correct answer is B .
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Question 296:
Three forces with magnitudes 16 N, 12 N and 21 N are shown in the diagram below. Determine the magnitude of their resultant force and angle with the x-axis
Options:
A) 7.63N,61°
B) 8.71N,61°
C) 7.63N,29°
D) 8.71N,29°
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The correct answer is B .
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Question 297:
Two metals P and Q 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 their
Length is 3: 4 respectively, the ratio of the increase in lengths of P to Q is
Options:
A) 1:2
B) 2:1
C) 8:9
D) 9:8
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The correct answer is A .
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Question 298:
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 299:
Two horizontal forces, 10N and 8N and another force F1 inclined at 30 to the vertical acting as shown in the diagram above, keep the body P in equilibrium, The weight of the body is
Options:
A) 2√3/3N
B) √2N
C) 4√3/3
D) 2V3N
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The correct answer is D .
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Question 300:
The pinhole camera works on
Options:
A) the principle of the reversibility of light
B) the principle of the rectilinear propagation of light
C) Huygen’s principle
D) the principle of total internal reflection of light
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The correct answer is B .