Explanation

Paper is a thin sheet usually manufactured from cellulose pulp derived from wood.

Papermaking involves 5 steps:

Chipping, Making wood pulp, Spreading the pulp, Pressing-Drying-Rolling and Cutting Sheets.

Paper  is used widely for printing, writing, and packaging,

Paper is a thin material produced by pressing together moist fibers of cellulose pulp

 The first paper machine of Louis Robert.

SH10-8-2023

Explanation

Ablutophobia is the fear of bathing or washing.

It is a specific phobia where individuals experience anxiety related to personal hygiene activities.

Explanation

Alzheimer's disease is a disease that affects the brain and nervous system.

It happens when nerve cells in the brain die.

ND12_8_2023

Explanation

Unlike poles of different magnets attract each other; like poles repel each other.

 property of a magnet:

Like poles of the magnets i.e. north-north and south-south repel each other 

unlike poles of the magnets i.e. north-south and south-north attract each other.

Explanation

The reciprocal of frequency is its time period.

Explanation

An n-type semiconductor results from implanting dopant atoms that have more electrons in their outer (bonding) shell than silicon. 

Explanation

Ozone formula: O3

The stratospheric ozone layer is Earth's “sunscreen”  protecting living things from too much ultraviolet radiation from the sun.

Oxygen layer in the atmosphere

Ozone protects us from the harmful ultraviolet radiation of the sun.

The ozone layer lies approximately 15-40 kilometers (10-25 miles) above the Earth's surface, in the stratosphere.

The ozone layer is depleting: Air pollution

ND17-7-2023

Explanation

Inverters and rectifiers are electronic circuits that can change the type of electric current.

An inverter converts DC to AC,

while

a rectifier converts AC to DC.

Explanation

Power of a Lens= 1/focal length

Explanation

The SI unit of temperature as per the International System of Units is Kelvin 

represented by the symbol  K

Note : 

Celsius is currently a derived unit for temperature in the SI system, Kelvin is the base unit. 

ND17-7-2023

Explanation

By mole fraction (i.e., by variety of molecules), dry air contains seventy eight.08% element, 20.95% oxygen, 0.93% argon, 0.04% greenhouse emission, and tiny amounts of alternative gases

Explanation

According to John Dewey, education is the reconstruction or reorganization of experiences which adds meaning and prepares individuals for future experiences.

He believed learning is rooted in experience and interaction with the environment.

Explanation

Pedagogy is the science and art of teaching children.

It involves strategies, methods, and practices used in school education.

Explanation

Here ignorance means درگزر

Ignoring minor inappropriate behavior is often an effective strategy to reduce it, as it deprives the behavior of attention, which can discourage repetition.

Praise and reward are better used to reinforce positive behavior.

Strictness may be counterproductive for minor issues.

Explanation

SOLO Taxonomy consists of five levels:

1. Prestructural
2. Unistructural
3. Multistructural
4. Relational
5. Extended Abstract

Explanation

Explanation

The process in which numbers are assigned to a person's performance is called Measurement

 Measurement refers to the act of assigning numerical values to specific traits or characteristics of an individual, based on a defined set of rules or criteria. 

Explanation

John Dewey is known as the father of the activity-based curriculum due to his emphasis on learning by doing.

He believed education should be child-centered and connected to real-life experiences.

Explanation

An outline of the topic or subject to be covered within a specific time is called a syllabus.

A syllabus typically includes a summary of topics, objectives, schedule, assignments.

Explanation

The Activity method focuses on engaging students actively in the learning process, making science more hands-on and experiential.

It is considered an effective method for teaching science at the elementary level in Pakistan, as it encourages exploration and inquiry-based learning.

Explanation

Assimilation is the process of integrating new information into existing cognitive frameworks or knowledge.

It allows individuals to handle new experiences using previously learned behaviors and understanding.

Explanation

The affective domain includes how we deal with things emotionally, such as:

• feelings
• values
• appreciation
• enthusiasm
• motivations
• attitudes
  

Explanation

Teaching aims to bring about a positive and lasting change in students' behavior or understanding.

It goes beyond just imparting knowledge to shaping attitudes and skills.

Explanation

The Socratic method is a method of asking questions after questions from students.

A Socratic method is a form of cooperative argumentative dialogue between individuals.

It is based on asking and answering questions to stimulate critical thinking and to draw out ideas and underlying presuppositions.

Explanation

Curriculum development is an ongoing process that requires continuous evaluation and improvement.

It follows a regular cycle of planning, implementation, assessment, and revision.

Explanation

The project method is particularly effective for teaching science.

Because it involves hands-on, inquiry-based learning where students work on practical tasks or investigations.

Explanation

Brainstorming is a widely used technique to generate creative ideas and solutions by encouraging free thinking without immediate judgment.

It helps individuals or groups explore multiple possibilities quickly, fostering innovation and originality.

Explanation

The pattern is reversing the digits:

PEACH → HCAEP

26541 → 14562

Explanation

If 20% of the students are girls, then the remaining percentage (100% - 20% = 80%) represents the boys.

So, in a class of 40 students:

80% of 40 = (80/100) * 40 = 0.8 * 40 = 32

Therefore, there are 32 boys in the class.

Explanation

The average is the sum divided by the number of quantities:

Average = Sum / n

115 = 1840 / n

To find 'n', multiply both sides by 'n' and then divide by 115:

n = 1840 / 115

n = 16

Explanation

A pie graph (or pie chart) is divided into sectors, where each sector represents a part of the whole.

The size of each sector corresponds to the proportion of the category it represents.

Explanation

To find the area of the strip:

1. Calculate the area of the larger rectangle (including the strip):

New length = 82 + 2_4 = 90 cm

New width = 75 + 2_4 = 83 cm

Area of larger rectangle = 90 * 83 = 7470 cm²

2. Calculate the area of the original rectangle:

Area = 82 * 75 = 6150 cm²

3. Find the area of the strip:

Area of strip = Area of larger rectangle - Area of original rectangle

= 7470 - 6150

= 1320 cm²

Explanation

A protractor allows you to measure and draw exact angles like 72° directly.

A compass alone cannot construct 72° easily without complex geometric steps, so it’s not practical for this angle.

Explanation

Convert to a common denominator: 3/8 + 4/2 = 3/8 + 16/8.

Add the fractions: (3 + 16) / 8 = 19/8.

Explanation

Explanation

A number is a perfect square (or a square number) if its square root is an integer;

that is to say, it is the product of an integer with itself.

Here, the square root of 513 is about 22.650.

Explanation

Prime Factorization

1050 = 2 × 3 × 5 × 5 × 7

750 = 2 x 3 x 5 x 5 x 5

Common Factor = 2 x 3 x 5 x 5 = 150

Greatest Common Factor (GCF) = 150

Explanation

Let the height of the building be x meters.

Less lengthy shadow, Less in the height (Direct Proportion)

∴ 40.25 : 28.75 :: 17.5 : x ⇔ 40.25 × x = 28.75 × 17.5

Explanation

In Maths, a straight angle is an angle equal to 180°.

It is called straight because it appears as a straight line.

Explanation

Given sequence: 4, 11, 7, 14, 10, 17, __, 20

Two alternating series are used:

First series: 4 → 7 → 10 → 13 (+3 each time)

Second series: 11 → 14 → 17 → 20 (+3 each time)

Missing number: 13

Explanation

Multiplying 3.29 by 1000 gives:

3.29 × 1000 = 3290

Explanation

To convert 2/5 to a percentage:

First, convert the fraction to a decimal:

2/5 = 2 ÷ 5 = 0.4

Now, convert the decimal to a percentage:

0.4 × 100% = 40%

Explanation

To find the ratio between their ages, we need to convert their ages to a common unit (months):
Ashraf's age:
15 years × 12 months/year = 180 months

- 10 months = 190 months

Akmal's age:
17 years × 12 months/year = 204 months

- 5 months = 209 months

Now, find the ratio:
Ashraf's age : Akmal's age = 190 : 209
Simplify the ratio:
190 ÷ 19 = 10
209 ÷ 19 = 11
So, the ratio is:
10 : 11

Explanation

25% of 200 is calculated by

multiplying 200 by 25/100,

which equals 50.

Explanation

Explanation

The ratio of boys to girls is given as 3:4, and the total number of students in the class is 28.

Step 1: Add the parts of the ratio

Step 2: Calculate the value of one part

Each part of the ratio represents:

Step 3: Find the number of boys

The boys' share is 3 parts, so:

Explanation

Let C's age be x years. Then, B's age = 2x years. A's age = (2x + 2) years.

∴ (2x + 2) + 2x + x = 27

⇒ 5x = 25

⇒ x = 5.

Hence, B's age = 2x = 10 years.

Explanation

Six tenths is the same as 6/10, which simplifies to 3/5 or 0.6.

Explanation

The square root of 169 is 13, since 13 multiplied by 13 (13²) equals 169.

Explanation

The area of a rectangle is calculated by multiplying its length by its breadth:

Area = Length × Breadth

= 16 cm × 3 cm

= 48 cm²