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 681:
In an AC circuit, resonance occurs when the impedance of the circuit is:
Options:
A) Zero
B) Maximum
C) Equal to the capacitive reactance of the circuit
D) Minimum
Show Answer
The correct answer is D .
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Question 682: At different locations on the earth's surface, the earth's magnetic field is
Options:
A) the same in magnitude and direction
B) the same in magnitude but different in direction
C) different in both magnitude and direction
D) different in magnitude but different in direction
Show Answer
The correct answer is A .
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Question 683: What is the difference in the amount of heat given out by 4kg of steam and 4kg of water when both are cooled from 100oC to 80oC? [the specific latent heat of steam is 2,260,000Jkg-1, specific heat capacity of water is 4200Jkg-1K-1]
Options:
A) 4200J
B) 2,260,OOOJ
C) 9,040,000J
D) 9,380,000J
Show Answer
The correct answer is C .
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Question 684: Heat losses to the surrounding is possible through the following except
Options:
A) Conduction
B) Convection
C) Radiation
D) Expansion
Show Answer
The correct answer is D .
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Question 685: The velocities of light in air and glass are 3.0 x 108ms-1 and 2.0 x 108ms-1 respectively. If the angle of refraction is 30°, the sine of the angle of incidence is
Options:
A) 0.33
B) 0.50
C) 0.67
D) 0.75
Show Answer
The correct answer is D .
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Question 686:
The figure above shows two similar bulbs X and Y connected to suitable power supply with F as an appropriate fuse rating, if the filament of X breaks then the
Options:
A) Brightness Of Y will reduce
B) Brightness Of Y will remain constant
C) Brightness Of Y will increase
D) fuse F will blow
Show Answer
The correct answer is C .
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Question 687: Which of the following correctly, describes the image of an object, 4cm from a diverging lens of focal length 12cm?
Options:
A) The image is virtual, 3cm in front of the lens
B) The image is real, 6cm behind the lens
C) The image is virtual, 6cm in front of the lens
D) The image is real, 3cm in front the lens
Show Answer
The correct answer is A .
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Question 688: A 3m3 volume of liquid W of density 200kgm3 is mixed with another liquid L of volume 7m3 and density 150kgm-3. the density of mixture is?
Options:
A) 165kgm-3
B) 100kgm-3
C) 265kgm-3
D) 350kgm-3
Show Answer
The correct answer is A .
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Question 689: After three half lifes, the fraction of a radioactive material that has decayed is
Options:
A)
B)
C)
D)
Show Answer
The correct answer is D .
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Question 690:
An air bubble of radius 4.5 cm initially at a depth of 12 m below the water surface rises to the surface. If the atmospheric pressure is equal to 10.34 m of water, the radius of the bubble just before it reaches the water surface is
Options:
A) 6.43 cm
B) 8.24 cm
C) 4.26 cm
D) 5.82 cm
Show Answer
The correct answer is D .