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9021 quizzes
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
JEE MainAEEE (Amrita)AMUEEE+23
StemPy LabStemPy Lab
Hard
A student compares the geometry of four pairs of species. In which pair do both species have the same geometry? New
High School (11–12) · Groups 17 and 18: Halogens and Noble Gases
JEE MainA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
The figure shows the number of cups of hot drinks sold by a cafe against the noon temperature on eight days. The line of best fit passes through the point of the means, (24, 50), and its slope is -2.5 cups for each degree. What number of cups does the line predict for a noon temperature of 30 °C? New
High School (11–12) · Statistics
JEE MainAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
A couple's treatment gives them two embryos, and the chance of a successful implantation is one half for each embryo, with no link between them. What is the chance of a pregnancy, meaning that one embryo or both are implanted? New
High School (11–12) · Reproductive Health
StemPy LabStemPy Lab
Hard
A student types six expressions, one at a time, into a fresh Python session. Which of them give a value, instead of an error message? Choose every correct option.
High School (9–10) · Errors and Exceptions
PCEP (Python Institute)PCEP (Python Institute)
StemPy LabStemPy Lab
Hard
Which sentence is the best limit for a report on 20 winter days in one hill town?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
StemPy LabStemPy Lab
Easy
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
JEE MainAEEE (Amrita)AMUEEE+23
StemPy LabStemPy Lab
Hard
A chemist passes 0.45 mol of chlorine into hot, concentrated sodium hydroxide. How many moles of sodium chlorate form? New
High School (11–12) · Groups 17 and 18: Halogens and Noble Gases
JEE MainA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
For a data set, the regression coefficient of y on x is -2 and the regression coefficient of x on y is -0.125. What is the correlation coefficient? New
High School (11–12) · Statistics
JEE MainAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
A woman on the pill sees a bleeding in the 7 days with no pill. What is the reason? New
High School (11–12) · Reproductive Health
StemPy LabStemPy Lab
Hard
A loop prints a value in a try block. One item is the text "2", and only one kind of error is handled. What happens when the program runs?
High School (9–10) · Errors and Exceptions
PCEP (Python Institute)PCEP (Python Institute)
StemPy LabStemPy Lab
Advanced
A student writes: \"The mean highest temperature in the hill town was 12 °C, so every day was about 12 °C.\" What is wrong?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
StemPy LabStemPy Lab
Medium
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
JEE MainAEEE (Amrita)AMUEEE+23
StemPy LabStemPy Lab
Hard
Why is the F-F bond weaker than the Cl-Cl bond although fluorine atoms are smaller? New
High School (11–12) · Groups 17 and 18: Halogens and Noble Gases
A-LevelIBAEEE (Amrita)+18A-LevelIB
StemPy LabStemPy Lab
Medium
A student finds that the correlation between two variables is 0.5 and says that the line explains 50% of the variation in y. A teacher says that this is wrong. What is the correct percentage? New
High School (11–12) · Statistics
APA-LevelIB+19APA-LevelIB
StemPy LabStemPy Lab
Medium
A copper releasing IUD and a hormone releasing IUD are compared. Which statement is correct? New
High School (11–12) · Reproductive Health
StemPy LabStemPy Lab
Hard
A try statement has three except blocks, and the error fits more than one of them. What does the program print?
High School (9–10) · Errors and Exceptions
PCEP (Python Institute)PCEP (Python Institute)
StemPy LabStemPy Lab
Hard
In the hill town, the 3 snowy days had a mean highest temperature of 8.7 °C, and the other 17 days 12.5 °C. What may a report say?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
APIBAPIB
StemPy LabStemPy Lab
Medium
The two inputs of a NOR gate are joined together, and one signal A is applied to both. A student writes the truth table of the output for A = 0 and for A = 1. Which behaviour does she find? New
High School (11–12) · Transistors and Logic Gates
AEEE (Amrita)AMUEEEAP EAPCET+17
StemPy LabStemPy Lab
Medium
Four oxoacids of chlorine are compared by their strength in water. Which one is the strongest of the four? New
High School (11–12) · Groups 17 and 18: Halogens and Noble Gases
A-LevelIBAEEE (Amrita)+18A-LevelIB
StemPy LabStemPy Lab
Medium
A line of best fit was found from a data set in which x ran from 10 to 50. Which of these predictions is an interpolation? New
High School (11–12) · Statistics
APA-LevelIB+19APA-LevelIB
StemPy LabStemPy Lab
Medium
The graph shows the chance of at least one success against the number of cycles tried, for three techniques P, Q and R. The chance in a single cycle is different for each. Which statement is correct? New
High School (11–12) · Reproductive Health
StemPy LabStemPy Lab
Hard
A loop adds a note to a list before a statement that can fail. Two except blocks add other notes. What does the program print?
High School (9–10) · Errors and Exceptions
PCEP (Python Institute)PCEP (Python Institute)
StemPy LabStemPy Lab
Hard
The chance of a snowy day is 0.15. If each day's weather did not depend on the day before, what would be the chance of two snowy days in a row?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
APIBAPIB
StemPy LabStemPy Lab
Hard
A student builds a pre-amplifier for a small sensor with one transistor of current gain 75. The load in the collector lead is 2.7 kΩ, and she measures an input resistance of 650 Ω at the base. By what factor does the circuit multiply a small signal voltage? Give the size only. New
High School (11–12) · Transistors and Logic Gates
AEEE (Amrita)AMUEEEAP EAPCET+17
StemPy LabStemPy Lab
Medium
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