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 381: A 0 - 10mA galvanometer with a coil resistance of 30 can be converted to a 0 - 10A ammeter by using
Options:
A) 0.03 series resistor
B) 0.03 shunt resistor
C) 9.99 shunt resistor
D) 9.99 series resistor
Show Answer
The correct answer is B .
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Question 382: A wave has a frequency of 2Hz and a wavelength of 30cm. The velocity of the wave is
Options:
A) 60.0ms-1
B) 6.0ms-1
C) 1.5ms-1
D) 0.6ms-1
Show Answer
The correct answer is D .
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Question 383: Which of the following statements is NOT correct?
Options:
A) The average range of distinct vision for a normal eye is from the far distance (infinity) up to about 25cm in front of the eye
B) Longsighted people have difficulty in making the eye lense sufficiently powerful to focus on nearby objects
C) Shortsighted people cannot accommodate distant objects
D) Longsighted people need diverging spectacle lenses
E) A person with long sight has his eye-ball too short and the image of an object is therefore formed behind the retina
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The correct answer is D .
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Question 384:
A lead bullet of mass 0.05kg is fired with a velocity of 200ms into a block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is?
Options:
A) 50J
B) 100J
C) 150J
D) 200J
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The correct answer is A .
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Question 385:
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 386: A bob of weight 0.1 N hangs from a massless string of length 50 cm. A variable horizontal force which increase from zero is applied to pull the bob until the string makes an angle of 60o with the vertical. The work done is
Options:
A) 0.500 J
B) 0.250 J
C) 0.050 J
D) 0.025 J
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The correct answer is D .
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Question 387: Three 3ω resistance are connected in parallel what is the equivalent resistance?
Options:
A) 1ω
B) 9ω
C) 3ω
D) 0.33ω
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The correct answer is A .
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Question 388:
In Sunlight, a blue flower looks blue because we see the flower by the light it
Options:
A) receives from our eyes
B) disperses
C) absorbed
D) reflect
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The correct answer is D .
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Question 389:
If the fraction of the atoms of a radioactive material left after 120 years is 1/64, what is the half-life of the material?
Options:
A) 24 years
B) 20 years
C) 10 years
D) 2 years
Show Answer
The correct answer is B .
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Question 390: An insulated rod when rubbed with a material acquires
Options:
A) a negative charge if it is made of glass and rubbed with silk
B) no charge if it is made of glass and rubbed with fur
C) no charge if it is made of copper and rubbed with silk
D) a positive charge if it is made of copper and rubbed with fur
Show Answer
The correct answer is B .