Code.org Unit 1 Review

Quiz
•
Computers
•
9th - 12th Grade
•
Hard
Nate Edwards
Used 5+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When visiting a museum Lian takes a photo of a painting with a smartphone which stores the photo as an image file. Which of the following best describes the differences between the painting itself and the photo of the painting stored on the smartphone?
Cuando visita un museo, Lian toma una fotografía de una pintura con un teléfono inteligente que almacena la foto como un archivo de imagen. ¿Cuál de las siguientes opciones describe mejor las diferencias entre el cuadro en sí y la foto del cuadro almacenada en el teléfono inteligente?
Both the painting and the photo are analog
Tanto el cuadro como la foto son analógicos.
The photo is a digital representation of the analog painting
La foto es una representación digital de la pintura analógica.
Sampling can be used to determine whether the analog image is an accurate representation of the painting
Se puede utilizar el muestreo para determinar si la imagen analógica es una representación precisa de la pintura.
The phone can represent the photo in either digital or analog formats depending on the sampling technique that is used
El teléfono puede representar la foto en formato digital o analógico dependiendo de la técnica de muestreo que se utilice.
Answer explanation
A painting is an analog because it's something with continuous representation. A digital photo changes discreetly at every pixel using a finite set of colors.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Your computer uses 4 bits to represent decimal numbers (0, 1, 2, 3 and so on) in binary. What is the SMALLEST number for which an overflow error occur?
Su computadora usa 4 bits para representar números decimales (0, 1, 2, 3, etc.) en binario. ¿Cuál es el número MÁS PEQUEÑO para el cual ocurre un error de desbordamiento?
14
15
16
17
Answer explanation
The 4-bit binary number 1111 represents the decimal number 15. Counting up to the next number, 16, will cause the 4-bit binary number to overflow to 0000 just like an odometer
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following best describes how computing devices represent information?
¿Cuál de las siguientes opciones describe mejor cómo los dispositivos informáticos representan la información?
A computer will either represent information as bits or bytes but not both
Una computadora representará información como bits o bytes, pero no ambos.
A computer represents data as a byte which is either a 0 or a 1
Una computadora representa los datos como un byte que es 0 o 1.
A computer represents data as bits which is either a 0 or a 1
Una computadora representa datos como bits que son 0 o 1.
A computer represents information as bits which contain 8 bytes.
Una computadora representa información como bits que contienen 8 bytes.
Answer explanation
The definition of a bit: a contraction of "Binary Digit"; the single unit of information in a computer, typically represented as a 0 or 1.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is true of how computers represent numbers?
¿Cuál de las siguientes afirmaciones es verdadera sobre cómo las computadoras representan números?
Using a fixed but large number of bits can eliminate the possibility of round off error when representing numbers in binary
El uso de una cantidad fija pero grande de bits puede eliminar la posibilidad de error de redondeo al representar números en binario
With a fixed number of bits some numbers are too large to represent in a computer which will lead to overflow errors.
Con un número fijo de bits, algunos números son demasiado grandes para representarlos en una computadora, lo que provocará errores de desbordamiento.
Using a fixed but large number of bits, for example 128, eliminates the possibility of overflow errors.
El uso de una cantidad fija pero grande de bits, por ejemplo 128, elimina la posibilidad de errores de desbordamiento.
With a large but fixed number of bits it is possible to eliminate either round-off errors or overflow errors, but not both.
Con un número de bits grande pero fijo es posible eliminar errores de redondeo o de desbordamiento, pero no ambos.
Answer explanation
With a fixed amount of bits, no matter how many, at some point the largest possible value will be reached, with 1s for all the bits. Representing the next largest number will lead to an overflow error and the odometer will start back at all 0s.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is true of how computers represent numbers?
¿Cuál de las siguientes afirmaciones es verdadera sobre cómo las computadoras representan números?
Using a fixed but large number of bits can eliminate the possibility of round off error when representing numbers in binary
El uso de una cantidad fija pero grande de bits puede eliminar la posibilidad de error de redondeo al representar números en binario.
With a fixed number of bits some numbers are too large to represent in a computer which will lead to overflow errors.
Con un número fijo de bits, algunos números son demasiado grandes para representarlos en una computadora, lo que provocará errores de desbordamiento.
Using a fixed but large number of bits, for example 128, eliminates the possibility of overflow errors.
El uso de una cantidad fija pero grande de bits, por ejemplo 128, elimina la posibilidad de errores de desbordamiento.
With a large but fixed number of bits it is possible to eliminate either round-off errors or overflow errors, but not both.
Con un número de bits grande pero fijo es posible eliminar errores de redondeo o de desbordamiento, pero no ambos.
Answer explanation
With a fixed amount of bits, no matter how many, at some point the largest possible value will be reached, with 1s for all the bits. Representing the next largest number will lead to an overflow error and the odometer will start back at all 0s.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Using the online FlippyDo, convert the binary (base-2) number 1001 to decimal (base-10).
9
10
16
17
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Use the Flippy Do and convert the decimal (base-10) number 20 to binary (base-2).
Utilice Flippy Do y convierta el número decimal (base-10) 20 a binario (base-2).
10010
00101
11000
10100
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