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Quizzes

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Exam:
610 quizzes
Two signals of four bits each are applied to the two inputs of an XOR gate. The input A is 1010 and the input B is 1100, read from left to right. What is the output, bit by bit? New
High School (11–12) · Transistors and Logic Gates
AEEE (Amrita)AMUEEEAP EAPCET+22
StemPy LabStemPy Lab
Hard
A student says that the base plays a small part in a transistor. She argues that the base current is only about one per cent of the collector current. She adds that the collector current would be nearly the same if the base wire were cut. Which reply is correct? New
High School (11–12) · Transistors and Logic Gates
AEEE (Amrita)AMUEEEAP EAPCET+22
StemPy LabStemPy Lab
Hard
A burglar alarm uses a buzzer of 250 Ω that is fed from a 10 V battery through a transistor of current gain 125. When the alarm rings, the transistor is saturated and keeps 0.2 V between its collector and emitter. How small can the base current be while the alarm still rings at full strength? New
High School (11–12) · Transistors and Logic Gates
AEEE (Amrita)AMUEEEAP EAPCET+22
StemPy LabStemPy Lab
Hard
A student says: in the depletion layer of an unbiased p-n junction there are no charges at all, so there is no electric field in it. Which reply is correct? New
High School (11–12) · Semiconductors and Diodes
AEEE (Amrita)AMUEEEAP EAPCET+22
StemPy LabStemPy Lab
Hard
A forward-biased silicon diode carries 4.0 mA. Take VT = 26 mV, and the ideality factor 1. What is the dynamic resistance of the diode at this current? New
High School (11–12) · Semiconductors and Diodes
AEEE (Amrita)AMUEEEAP EAPCET+22
StemPy LabStemPy Lab
Hard
The reverse current of a silicon diode is a few nanoampere at 300 K. A designer warms the diode to a higher temperature with the reverse voltage kept fixed. How does the reverse current change, and why? New
High School (11–12) · Semiconductors and Diodes
AEEE (Amrita)AMUEEEAP EAPCET+22
StemPy LabStemPy Lab
Hard
A student joins a 4.1 V Zener diode directly across a 12 V battery, in reverse bias, with no series resistor. The battery has a very small internal resistance. What happens? New
High School (11–12) · Semiconductors and Diodes
AEEE (Amrita)AMUEEEAP EAPCET+22
StemPy LabStemPy Lab
Hard
A caravan carries a flat panel of 0.45 m² on its roof. On a hazy day the sunlight that reaches the roof is 750 W/m², and the panel turns 17 % of the light power into electrical power. How many watt does the panel give? New
High School (11–12) · Semiconductors and Diodes
AEEE (Amrita)AMUEEEAP EAPCET+22
StemPy LabStemPy Lab
Hard
A photodiode and a solar cell are both p-n junctions that are lit by light. One is used with a reverse bias and the other with no bias. Which pair describes the reason correctly? New
High School (11–12) · Semiconductors and Diodes
AEEE (Amrita)AMUEEEAP EAPCET+22
StemPy LabStemPy Lab
Hard
The binding energy per nucleon is lower for a very heavy nucleus than for iron-56. What is the main reason? New
High School (11–12) · Nuclei and Radioactivity
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
A heavy nucleus with 224 nucleons and 7.65 MeV per nucleon splits into two unequal nuclei. One has 96 nucleons with 8.55 MeV per nucleon, and the other has 128 nucleons with 8.45 MeV per nucleon. How much energy is released? New
High School (11–12) · Nuclei and Radioactivity
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
Thorium-232 has an atomic mass of 232.038055 u. It decays by alpha emission into radium-228, which has an atomic mass of 228.031070 u. A helium-4 atom has 4.002603 u. Use 1 u = 931.494 MeV/c². How much energy is released in the decay? New
High School (11–12) · Nuclei and Radioactivity
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
A radioactive source has an activity of 3.0 × 10⁶ Bq and a half-life of 5.0 h. How many radioactive nuclei does it contain? New
High School (11–12) · Nuclei and Radioactivity
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
A nucleus can decay in two ways. By one way alone its half-life would be 10 min, and by the other way alone 40 min. What is its half-life when both ways act? New
High School (11–12) · Nuclei and Radioactivity
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
Which nuclei slow a fast neutron most effectively when it collides with them? New
High School (11–12) · Nuclei and Radioactivity
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
A nuclear power plant makes 520 MW of heat for one year (3.156 × 10⁷ s). How much mass is turned into energy in that year? Use c = 2.998 × 10⁸ m/s. New
High School (11–12) · Nuclei and Radioactivity
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
Compared with the fission of uranium-235, the fusion of deuterium and tritium gives, for the same mass of fuel, New
High School (11–12) · Nuclei and Radioactivity
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
White light falls on a double slit, and at one point of the screen the path difference is 1.37 µm. One colour of the visible spectrum is missing there, because it interferes destructively. What is its wavelength? New
High School (11–12) · Wave Optics
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
A double-slit experiment in air gives a fringe width β. The whole apparatus is then put under a liquid of refractive index 1.35. Which change brings the fringe width back to β? New
High School (11–12) · Wave Optics
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
The two slits of a double-slit experiment have widths in the ratio 4 : 1, so they give intensities in the same ratio. What is the ratio of the brightest to the darkest intensity in the pattern? New
High School (11–12) · Wave Optics
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
A telescope just resolves two stars in red light. The same telescope is then used with blue light, which has about half the wavelength. What can it do now? New
High School (11–12) · Wave Optics
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
A physics teacher makes a double slit from two cuts in metal foil. Each cut is 0.030 mm wide, and the centres of the cuts are 0.17 mm apart. A laser shines through them. The screen shows fine bright lines inside one broad central band. How many fine bright lines lie in that band? New
High School (11–12) · Wave Optics
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
White light, with wavelengths from 400 nm to 700 nm, falls on a grating with a very small line spacing, so that several orders exist. Which statement about the spectra is true? New
High School (11–12) · Wave Optics
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
A thin soap film in air is lit from the front. When it is much thinner than the wavelength of light, how does it look in reflected light? New
High School (11–12) · Wave Optics
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
A slip of clear plastic with refractive index 1.7 and a thickness of 1.4 µm is stuck over one of the two slits of a double-slit set-up. The set-up is lit by blue light of wavelength 460 nm. By how many fringe widths does the whole pattern slide? New
High School (11–12) · Wave Optics
JEE AdvancedAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
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