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 641: The most suitable type of mirror used for the construction of the search light is the
Options:
A) concave mirror
B) convex mirror
C) spherical mirror
D) parabolic mirror
Show Answer
The correct answer is D .
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Question 642: Which of the following properties is/are common to all waves? i. Diffraction ii. Refraction iii. Interference
Options:
A) i only
B) ii only
C) ii and iii
D) i, ii, and iii
Show Answer
The correct answer is D .
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Question 643: The correct unit of energy density is?
Options:
A) kg m3 s-2
B) kg m2 s-2
C) kg m-3 s-2
D) kg m-1 s-2
Show Answer
The correct answer is D .
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Question 644:
The figure above shows a block of mass m sliding down a rough inclined plane QP at angle . The forces acting on the block along QP are
Options:
A) mg sinθ and the normal reaction
B) mg sinθ and the force of friction
C) mg sinθ and the normal reaction
D) mg cosθ and the normal reaction
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The correct answer is B .
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Question 645: An electric iron is rated 1000W, 230V. What is the resistance of its elements?
Options:
A) 51.9Ω
B) 52.9Ω
C) 55.9Ω
D) 57.6Ω
Show Answer
The correct answer is B .
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Question 646:
The total power drawn from the cell in the circuit above is
Note: The cell voltage is 12V and all three resistors are 4 ohm resistors.
Options:
A) 12W
B) 24W
C) 32W
D) 40W
Show Answer
The correct answer is B .
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Question 647: Calculate the length which corresponds to a temperature of 20oC if the ice and steam points of an unguarded thermometer are 400 mm apart
Options:
A) 20mm
B) 30mm
C) 60mm
D) 80mm
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The correct answer is D .
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Question 648: The production of pure spectrum could easily be achieved using a?
Options:
A) glass prism with a pin
B) triangular prism with two convex lens
C) traingular prism only
D) triangular prism with two concave lenses
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The correct answer is B .
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Question 649: A brass rod is 2m long at a certain temperature. What is the length for a temperature rise of 100K, if the expansivity of brass is 18 x 10-6K-1?
Options:
A) 2.0036m
B) 2.0018cm
C) 2.1800
D) 2.0360m
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The correct answer is A .
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Question 650: At a fixed point below a liquid surface, the pressure downwards is P1 and pressure upwards is P2. It can be deduced that
Options:
A) P1 > P2
B) P1 ≥ P2
C) P1< P2
D) P1 = P2
Show Answer
The correct answer is A .