Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
one application of polarized light in electronics.(1 marks)craft1 electrical June/July 2020
Display screens: Polarized light can be used in display screens, such as LCD screens, to reduce glare and improve the visibility of the screen in bright environments. Optical fibers: Polarized light can be used to transmit data through optical fibers, which are thin strands of glass or plastic thatRead more
State whether each of the following characteristics of a car is either a qualitative or quantitative measure: (i) age of the car; (ii) colour of the car; (iii) softness of the car seat; (iv) cost of the car in Ksh; (v) mileage of the car. (5 marks}DICT MOD 1 July 2020
(i) Age of the car: This is a quantitative measure because it is a numerical value that represents the length of time that has passed since the car was manufactured. (ii) Colour of the car: This is a qualitative measure because it is a non-numerical characteristic that describes the appearance of thRead more
(i) Age of the car: This is a quantitative measure because it is a numerical value that represents the length of time that has passed since the car was manufactured.
(ii) Colour of the car: This is a qualitative measure because it is a non-numerical characteristic that describes the appearance of the car.
(iii) Softness of the car seat: This is a qualitative measure because it is a non-numerical characteristic that describes the comfort of the car seat.
(iv) Cost of the car in Ksh: This is a quantitative measure because it is a numerical value that represents the monetary value of the car.
(v) Mileage of the car: This is a quantitative measure because it is a numerical value that represents the distance that the car has traveled
See lessOutline four properties of the arithmetic mean. (4 marks)DICT MOD 1 July 2020
It is sensitive to extreme values: The arithmetic mean is sensitive to extreme values, which means that it can be greatly affected by values that are significantly larger or smaller than the other values in the data set. For example, if a data set contains both very large and very small values, theRead more
Using Pascal’s triangle, expand each of the following expressions in ascending powers of x: (i) (a+x)^3 (ii) (2+x)^6. (6 marks)DICT MOD 1 July 2020
(i) To expand (a+x)^3 using Pascal's triangle, we start by writing the binomial and the exponent in the top row of the triangle: 1 3 We can then use the numbers in the triangle to fill in the rows below: 1 3 1 3 The expansion of (a+x)^3 is obtained by multiplying each term in the binomial by the corRead more
(i) To expand (a+x)^3 using Pascal’s triangle, we start by writing the binomial and the exponent in the top row of the triangle:
1 3
We can then use the numbers in the triangle to fill in the rows below:
1 3 1 3
The expansion of (a+x)^3 is obtained by multiplying each term in the binomial by the corresponding coefficient in the triangle and then summing the terms:
(a+x)^3 = 1a^3 + 3a^2x + 3ax^2 + x^3
(ii) To expand (2+x)^6 using Pascal’s triangle, we start by writing the binomial and the exponent in the top row of the triangle:
1 6
We can then use the numbers in the triangle to fill in the rows below:
1 6 1 6 1 6 1 6
The expansion of (2+x)^6 is obtained by multiplying each term in the binomial by the corresponding coefficient in the triangle and then summing the terms:
(2+x)^6 = 12^6 + 62^5x + 152^4x^2 + 202^3x^3 + 152^2x^4 + 62*x^5 + x^6
= 64 + 384x + 960x^2 + 1280x^3 + 960x^4 + 384x^5 + x^6
See lessExplain two assumptions of linear extrapolation. (4 marks)DICT MOD 1 July 2020
Linear extrapolation is a method of estimating the value of a function at a point outside the range of known data points. It is based on the assumption that the function is a straight line beyond the range of known data points. There are two main assumptions of linear extrapolation: The function isRead more
Linear extrapolation is a method of estimating the value of a function at a point outside the range of known data points. It is based on the assumption that the function is a straight line beyond the range of known data points. There are two main assumptions of linear extrapolation:
Distinguish between linear interpolation and linear extrapolation as used in mathematics. (4 marks)DICT MOD 1 July 2020
Linear interpolation is a method of estimating the value of a function at a point within the range of known data points. It is based on the assumption that the function is a straight line within the range of known data points. To interpolate a value, we use the known data points to fit a straight liRead more
Linear interpolation is a method of estimating the value of a function at a point within the range of known data points. It is based on the assumption that the function is a straight line within the range of known data points. To interpolate a value, we use the known data points to fit a straight line to the data and then use this line to estimate the value at the desired point.
Linear extrapolation, on the other hand, is a method of estimating the value of a function at a point outside the range of known data points. It is based on the assumption that the function is a straight line beyond the range of known data points. To extrapolate a value, we use the known data points to fit a straight line to the data and then use this line to estimate the value at the desired point outside the range of known data points.
See less(i) Define each of the following terms as applied in binary codes: (i) weighted binary codes; (ii) reflective codes; (iii) sequential codes; (3 marks)DICT MOD 1 July 2020
(i) Weighted binary codes are a type of binary code that assigns different weights or values to the digits (bits) in a binary number based on their position. In a weighted binary code, the value of each digit is determined by its position in the number. For example, in a binary number with a weightRead more
(i) Weighted binary codes are a type of binary code that assigns different weights or values to the digits (bits) in a binary number based on their position. In a weighted binary code, the value of each digit is determined by its position in the number. For example, in a binary number with a weight of 2, the rightmost digit (the least significant bit) has a value of 1, the next digit has a value of 2, the next has a value of 4, and so on. Weighted binary codes are often used to represent numeric values in computers and other digital systems.
(ii) Reflective codes are a type of error-detection code that uses a parity bit to detect errors in a transmitted message. In a reflective code, the parity bit is placed at the end of the message and is set to either 0 or 1 depending on the number of 1’s in the message. If the number of 1’s in the message is even, the parity bit is set to 0. If the number of 1’s in the message is odd, the parity bit is set to 1. When the message is received, the parity bit is checked to see if it is the same as the calculated parity. If the parity bit is not the same as the calculated parity, an error has occurred and the message must be re-transmitted.
(iii) Sequential codes are a type of code that assigns a unique code to each item in a set of items. In a sequential code, the codes are assigned in a specific order, usually based on the order in which the items were added to the set. Sequential codes are often used to uniquely identify items in a database or other data storage system.
See lessDistinguish between virtual memory and primary memory of the computer system. (4 marks)DICT MOD 1 July 2020
Virtual memory and primary memory are two types of memory that are used in a computer system. They have some similarities, but there are also some key differences between them: Purpose: The primary purpose of primary memory (also known as main memory or RAM) is to store data and instructions that arRead more
Virtual memory and primary memory are two types of memory that are used in a computer system. They have some similarities, but there are also some key differences between them:
Explain two emerging trends in respect to computer hard disks. (4 marks)DICT MOD 1 July 2020
Computer hard disks are an essential component of many computer systems, providing persistent storage for data and programs. There are several emerging trends in the field of hard disks that are worth noting: Solid-state drives (SSDs): Solid-state drives (SSDs) are a newer type of storage device thaRead more
Computer hard disks are an essential component of many computer systems, providing persistent storage for data and programs. There are several emerging trends in the field of hard disks that are worth noting:
Files are allocated disk space by the operating system using linked allocation method, Explain four characteristics of this method. (8 marks)DICT MOD 1 July 2020
The linked allocation method is a technique used by the operating system to allocate disk space to files. In this method, each file is represented by a chain of blocks (also known as clusters) on the disk, with each block containing a pointer to the next block in the chain. This technique has severaRead more
The linked allocation method is a technique used by the operating system to allocate disk space to files. In this method, each file is represented by a chain of blocks (also known as clusters) on the disk, with each block containing a pointer to the next block in the chain. This technique has several characteristics that distinguish it from other methods of disk allocation: