Bhagya – Page 285 – PSEB Solutions

PSEB 6th Class Social Science Notes Chapter 3 Motions of the Earth

November 24, 2021 by Bhagya

This PSEB 6th Class Social Science Notes Chapter 3 Motions of the Earth will help you in revision during exams.

PSEB 6th Class Social Science Notes Chapter 3 Motions of the Earth

→ Rotation: The spinning of the Earth on its axis from West to East in about 24 hours is called Rotation.

→ Revolution: The motion of the Earth around the sun, along an elliptical orbit from West to East is known as Revolution.

→ Axis of the Earth: Axis of the Earth is an imaginary line on which the earth rotates.

→ Orbit: It is an imaginary plane or path along which the Earth revolves round the sun.

→ Aphelion: When the Earth is farthest from the sun, its position is called Aphelion.

→ Perihelion: When the Earth is nearest the sun its position is called Perihelion.

→ Solstices: The positions of the Earth on 21st June and 22nd December are known as solstices.

→ Equinoxes: The positions of the Earth on 23rd September and 21st March are known as equinoxes.

→ Days and nights are unequal in length due to the inclination of the Axis.

→ The axis of the earth is inclined from the perpendicular.

→ The time taken for a revolution is 365 days and 6 hours.

→ Equal days and nights are found at the equator.

→ Four distinct seasons are formed at different positions of the earth on 21 March (Spring), 21 June (Summer), 23 September (Autumn), 22 December (Winter).

→ Opposite Seasons are formed in the Northern and Southern Hemisphere.

→ The earth rotates from West to East.

→ The period of rotation of the earth is called the earth day.

→ The earth revolves round the sun along an elliptical orbit.

→ When the Sun is directly over 23½° N, it is called the summer solstice, when the Sun is directly over 23½° S, it is called the winter solstice.

→ The Sun rises: The Sun rises in the east.

→ Copernicus: A scientist who discovered the sun to be stationary.

→ The direction of Rotation: West to East.

→ Leap Year: 2016

→ Ellipse: An elongated sphere.

→ Speed of the Earth: 1,05,600 km per hour.

→ The direction between the Sun and the Earth: 15 crore kms.

PSEB 6th Class Social Science Notes Chapter 2 Globe – The Model of the Earth

November 24, 2021 by Bhagya

This PSEB 6th Class Social Science Notes Chapter 2 Globe – The Model of the Earth will help you in revision during exams.

PSEB 6th Class Social Science Notes Chapter 2 Globe – The Model of the Earth

→ Latitude: Latitude is the angular distance of a place North or South of the Equator.

→ Longitude: Longitude is the angular distance of a place East or West of Prime Meridian.

→ Lines of Latitude: Lines of latitude are imaginary circles drawn parallel to the Equator.

→ Lines of Longitude: Lines of longitude are semi-circles joining the North pole and the South pole.

→ Local Time: Local time is the time provided by Noon Sun at a given place.

→ Standard Time: Standard Time is the local time of the Standard Meridian of a country.

→ G.M.T: Greenwich Mean Time is the local time of Prime Meridian. (0° longitude)

→ I.S.T: Indian Standard Time is the local time of 82½° East longitude passing between Allahabad and Mirzapur (U.P.).

→ Great Circle: A great circle is a circle which passes through the Centre of the earth and bisects it into two equal hemispheres.

→ Geoid: Geoid means Earth-like shape.

→ Equator: An imaginary line (East-West) that bisects the earth into two equal halves.

→ Graticule: Network formed by lines of latitude and lines of longitude.

→ Prime Meridian: It is the main meridian. (Zero meridians)

→ Torrid Zone: Hot Zone (23½° N – 23½° S)

→ Frigid Zone: Cold Zone (66½° – 90°)

→ Globe: Three-dimensional models of the earth

→ Axis: The imaginary line joining the north pole and the south pole.

→ Poles: The two ends of the axis are called poles.

→ Temperate zone: The zone with moderate temperatures.

→ The earth is inclined to the plane of earth’s orbit at an angle of 23½° from the perpendicular.

→ Parallels of latitude are the lines parallel to each other and equator on the globe in an E-W direction.

→ The equator divides the globe into two hemispheres – Northern and Southern. It is an imaginary line.

→ The earth is divided into three temperature zones i.e. the Tropical, the Temperate, and the Frigid zones.

→ 0° Longitude is called Prime Meridian.

→ The earth has been divided into 24 time zones.

→ Indian Standard Time (I.S.T.) is measured from 82½° E Meridian.

→ G.M.T. means Greenwich Mean Time which is used at a global level.

→ Greenwich (0° Longitude) is a town where a laboratory is located near London.

→ 180°E or W is known as the international dateline.

→ Equator: The line that bisects the earth into two equal halves.

→ Hemisphere: The half of a sphere.

→ Sphere: Rolled like a ball.

→ Heat zones: Temperature zones.

→ Meridians: Important to calculate time.

→ Grid: Network of parallel time and Meridians

→ Atlas: A book bound with maps.

→ Chandigarh: Latitude – 31°N, Longitude – 77°E.

PSEB 9th Class Maths Solutions Chapter 4 Linear Equations in Two Variables Ex 4.1

November 24, 2021November 24, 2021 by Bhagya

Punjab State Board PSEB 9th Class Maths Book Solutions Chapter 4 Linear Equations in Two Variables Ex 4.1 Textbook Exercise Questions and Answers.

PSEB Solutions for Class 9 Maths Chapter 4 Linear Equations in Two Variables Ex 4.1

Question 1.
The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement.
(Take the cost of a notebook to be and that of a pen to be ₹ y.)
Answer:
Let the cost of a notebook be ₹ x and the cost of a pen be ₹ y.
Then, according to the given data, the cost of a notebook is twice the cost of a pen.
∴ x = 2y
Thus, x = 2y, i.e., x – 2y = 0 is the required linear equation in two variables.

Question 2.
Express the following linear equations in the form ax + by + c = 0 and indicate the values of a, b and c in each case:
(i) 2x + 3y = 9.3\(\overline{5}\)
Answer:
2x + 3y = 9.3\(\overline{5}\)
∴ 2x + 3y – 9.3\(\overline{5}\) = 0
Here, a = 2, b = 3 and c = – 9.3\(\overline{5}\).

(ii) x – \(\frac{y}{5}\) – 10 = 0
Answer:
x – \(\frac{y}{5}\) – 10 = 0
∴x – \(\frac{1}{5}\)y – 10 = 0
Here, a = 1, b = – \(\frac{1}{5}\) and c = – 10.

(iii) – 2x + 3y = 6
Answer:
– 2x + 3y = 6
∴ – 2x + 3y – 6 = 0
Here, a = 1, b = – 3 and c = – 6.

(iv) x = 3y
Answer:
x = 3y
∴ x – 3y + 0 = 0
Here, a = 1, b = – 3 and c = 0.

(v) 2x = – 5y
Answer:
2x = – 5y
∴ 2x + 5y + 0 = 0
Here, a = 2, b = 5 and c = 0

(vi) 3x + 2 = 0
Answer:
3x + 2 = 0
∴ 3x + oy – 2 = 0
Here, a = 3, b = 1 and c = – 2

(vii) y – 2 = 0
Answer:
y – 2 = 0
∴ 0x + y – 2= 0
Here a = 0, b = 1 and c = – 2

(viii) 5 = 2x
Answer:
5 = 2x
∴ 5 – 2x = 0
∴ – 2x + 0y + 5 = 0
Here a = – 2, b = 0, c = 5

PSEB 6th Class Maths Solutions Chapter 3 Playing with Numbers Ex 3.2

November 24, 2021 by Bhagya

Punjab State Board PSEB 6th Class Maths Book Solutions Chapter 3 Playing with Numbers Ex 3.2 Textbook Exercise Questions and Answers.

PSEB Solutions for Class 6 Maths Chapter 3 Playing with Numbers Ex 3.2

1. Find the common factors of the followings:

Question (i)
16 and 24
Solution:
The factors of 16
= 1, 2, 4, 8, 16
The factors of 24
= 1, 2, 3, 4, 6, 8, 12, 24
Common factors of 16 and 24
= 1, 2, 4, 8

Question (ii)
25 and 40
Solution:
The factors of 25
= 1, 5, 25
The factors of 40
= 1, 2, 4, 5, 8, 10, 20, 40
Common factors of 25 and 40
= 1, 5

Question (iii)
24 and 36
Solution:
The factors of 24
= 1, 2, 3, 4, 6, 8, 12, 24
The factors of 36
= 1, 2, 3, 4, 6, 12, 18, 36
Common factors of 24 and 36
= 1, 2, 3, 4, 6, 12

Question (iv)
14, 35 and 42
Solution:
The factors of 14
= 1, 2, 7, 14
The factors of 35
= 1, 5, 7, 35
The factors of 42
= 1,2,3, 6, 7, 21, 42
Common factors of 14, 35 and 42
= 1, 7

Question (v)
15, 24 and 35.
Solution:
The factors of 15
= 1, 3, 5, 15
The factors of 24
= 1, 2, 3, 4, 6, 8, 12, 24
The factors of 35
= 1, 5, 7, 35
Common factors of 15, 24 and 35.
= 1

2. Find first three common multiples of the followings:

Question (i)
3 and 5
Solution:
The multiples of 3
= 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45
The multiples of 5
= 5, 10, 15, 20, 25, 30, 35, 40,45
First three common multiples of 3 and 5
= 15, 30 and 45

Question (ii)
6 and 8
Solution:
The multiples of 6
= 6, 12, 18, 24, 30, 36, 42, 48 54, 60, 66, 72
The multiples of 8
= 8, 16, 24, 32, 40, 48, 56, 64, 72
First three common multiples of 6 and 8
= 24, 48 and 72

Question (iii)
2, 3 and 4.
Solution:
The multiples of 2
= 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36
The multiples of 3
= 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36
The multiples of 4
= 4, 8, 12, 16, 20, 24, 28, 32, 36
First three common multiples of 2, 3 and 4
= 12, 24 and 36

3. Which of the following numbers are divisible by 2 or 4?

Question (i)
52314
Solution:
52314 is divisible by 2 as it is even number.
52314 is not divisible by 4 because the last two digits i.e. 14 which is not divisible by 4

Question (ii)
678913
Solution:
678913 is not divisible by 2. As it is an odd number.
678913 is not divisible by 4 because the last two digits i.e. 13 is not divisible by 4.

Question (iii)
4056784
Solution:
4056784 is divisible by 2. As it is an even number.
4056784 is also divisible by 4 because the last two digits i.e. 84 which is divisible by 4.

Question (iv)
21536
Solution:
21536 is divisible by 2. As it is an even number.
21536 is divisible by 4. As number formed by their last two digits is divisible by 4.

Question (v)
412318.
Solution:
412318 is divisible by 2. As it is an even number.
412318. is not divisible by 4. As number formed by their last two digits is not divisible by 4.

4. Which of the following numbers are divisible by 3 or 9?

Question (i)
654312
Solution:
654312 is divisible by 3.
As sum of its digits = 6 + 5 + 4 + 3 + 1 + 2 = 21, which is divisible by 3.
654312 is not divisible by 9.
As sum of its digits = 21, which is not divisible by 9.

Question (ii)
516735
Solution:
516735 is divisible by 3.
As sum of its digits = 5 + 1 + 6 + 7 + 3 + 5 = 27, which is divisible by 3.
516735 is also divisible by 9.
As sum of its digits = 27, which is divisible by 3.

Question (iii)
423152
Solution:
423152 is divisible by 3.
As sum of its digits = 4 + 2 + 3 + 1 + 5 + 2=17, which is not divisible by 3.
423152 is also not divisible by 9.
As sum of its digits = 17, which is not divisible by 9.

Question (iv)
704355
Solution:
704355 is divisible by 3.
As sum of its digits = 7 + 0 + 4 + 3 + 5 + 5 = 24, which is divisible by 3.
704355 is not divisible by 9.
As sum of its digits = 24, which is not divisible by 9.

Question (v)
215478.
Solution:
215478 is divisible by 3.
As sum of its digits = 2 + 1 + 5 + 4 + 7 + 8 = 27, which is divisible by 3.
215478 is divisible by 9.
As sum of its digits = 27, which is divisible by 9.

5. Which of the following numbers are divisible by 5 or 10?

Question (i)
456803
Solution:
456803 is not divisible by 5
As its last digit is not 0 or 5.
456803 is not divisible by 10
As its last digit is not 0.

Question (ii)
654130
Solution:
654130 is divisible by both 5 and 10
As its last digit is 0.

Question (iii)
256785
Solution:
256785 is divisible by 5
As its last digit is 5.
256785 is not divisible by 10
As its last digit is not 0.

Question (iv)
412508
Solution:
412508 is not divisible by 5
As its last digit is not 0 or 5.
412508 is not divisible by 10
As its last digit is not 0.

Question (v)
872565.
Solution:
872565 is divisible by 5
As its last digit is 5.
872565 is not divisible by 10
As its last digit is not 0.

6. Which of the following numbers are divisible by 8?

Question (i)
457432
Solution:
457432 is divisible by 8, because its last three digits are 432, which is divisible by 8.

Question (ii)
5134214
Solution:
5134214 is not divisible by 8, because its last three digits are 214, which is not divisible by 8.

Question (iii)
7232000
Solution:
7232000 is divisible by 8, because its last three digits are 000, which is divisible by 8.

Question (iv)
5124328
Solution:
5124328 is divisible by 8, because its last three digits are 328, which is divisible by 8.

Question (v)
642516.
Solution:
642516 is not divisible by 8, because its last three digits are 516, which is not divisible by 8.

7. Which of the following numbers are divisible by 6?

Question (i)
425424
Solution:
425424 is divisible by 2 because, it has 4 in its units place.
Sum of digits = 4 + 2 + 5+4 + 2 + 4 = 21
Sum of digits of 425424 is divisible by 3.
∴ 425424 is divisible by 2 as well as 3
Hence, 425424 is divisible by 6.

Question (ii)
617415
Solution:
617415 is not divisible by 2 because, it has 5 in its units place.
∴ 617415 is not divisible by 6.

Question (iii)
3415026
Solution:
3415026 is divisible by 2 because, it has 6 in its units place.
Sum of digits = 3 + 4 + 1 + 5 + 0 + 2 + 6 = 21
Sum of digits of 3415026 is divisible by 3
So, 3415026 is divisible by 3
∴ 3415026 is divisible by 2 as well as 3
Hence, 3415026 is divisible by 6.

Question (iv)
4065842
Solution:
4065842 is divisible by 2 because, it has 2 in its units place.
Sum of digits = 4 + 0 + 6 + 5 + 8 + 4 + 2 = 29
Sum of digits of 4065842 is not divisible by 3.
So, 4065842 is not divisible by 3.
∴ 4065842 is divisible by 2 but not by 3.
Hence, 4065842 is not divisible by 6.

Question (v)
725436.
Solution:
725436 is divisible by 2 because, it has 6 in its units place.
Sum of digits = 7 + 2 + 5 + 4 + 3 + 6 = 27
Sum of digits of 725436 is divisible by 3.
So, 725436 is divisible by 3.
∴ 725436 is divisible by 2 as well as 3
Hence, 725436 is divisible by 6.

8. Which of the following numbers are divisible by 11?

Question (i)
4281970
Solution:
4281970 is divisible by 11.
PSEB 6th Class Maths Solutions Chapter 3 Playing with Numbers Ex 3.2 1
Since sum of its digits in odd places = 4 + 8 + 9 + 0 = 21 and
sum of its digits in even places = 2 + 1 + 7 = 10
Their difference = 21 – 10=11, which is odd places digits divisible by 11.

Question (ii)
8049536
Solution:
8049536 is divisible by 11.
PSEB 6th Class Maths Solutions Chapter 3 Playing with Numbers Ex 3.2 2
Since sum of its digits in odd places = 8 + 4 + 5 + 6 = 23
and sum of its digits in even places = 0 + 9 + 3 = 12
Difference = 23 – 12 = 11, which is divisible by 11.

Question (iii)
1234321
Solution:
1234321 is divisible by 11.
PSEB 6th Class Maths Solutions Chapter 3 Playing with Numbers Ex 3.2 3
Since sum of its digits in odd places = 1 + 3 + 3 + 1 = 8
and sum of its digits in even places = 2 + 4 + 2 = 8
Difference = 8 – 8 = 0.

Question (iv)
6450828
Solution:
6450828 is not divisible by 11.
PSEB 6th Class Maths Solutions Chapter 3 Playing with Numbers Ex 3.2 4
Since sum of its digits in odd places = 6 + 5 + 8 + 8 = 27
and sum of its digits in even places = 4 + 0 + 2 = 6
Difference = 27 – 6 = 21, which is not divisible by 11.

Question (v)
5648346.
Solution:
5648346 is divisible by 11.
PSEB 6th Class Maths Solutions Chapter 3 Playing with Numbers Ex 3.2 5
Since sum of its digits in odd places = 5 + 4 + 3 + 6 = 18 and
sum of its digits in even places = 6 + 8 + 4 = 18.
Difference = 18 – 18 = 0.

9. State True or False:

Question (i)
If a number is divisible by 24, then it is also divisible by 3 and 8.
Solution:
True

Question (ii)
60 and 90 both are divisible by 10 then their sum is not divisible by 10.
Solution:
False

Question (iii)
If a number is divisible by 8 then it is also divisible by 16.
Solution:
False

Question (iv)
If a number is divisible by 15 then it is also divisible by 3.
Solution:
True

Question (v)
144 and 72 are divisible by 12 then their difference is also divisible by 12.
Solution:
True

10. If a number is divisible by 5 and 9 then by which other numbers will that number be always divisible?
Solution:
If a number is divisible by 5 and 9. Then the number is also divisible by their product i.e. 5 × 9 = 45.

11. Which of the following pairs are co-prime?

Question (i)
25, 35
Solution:
Two numbers are said to be co-prime if they do not have a common factor other than 1.
Given numbers are 25 and 35 Factors of 25 = 1, 5, 25
Factors of 35 = 1, 5, 7, 35
Since 25 and 35 have 1 and 5 two common factors
∴ 25 and 33 are not co-prime.

Question (ii)
16,21
Solution:
Given numbers are 16 and 21
Factors of 16 = 1, 2, 4, 8, 16
Factors of 21 = 3, 7, 21
There is only 1 common factors 16 and 21 are co-prime
∴ 16 and 21 are co-prime.

Question (iii)
24, 41
Solution:
Given numbers are 24 and 41
Factors of 24 = 1, 2, 3, 4, 6, 8, 12, 24
Factors of 41 = 1, 41
There is only one (1) common factors.
∴ 24 and 41 are co-prime.

Question (iv)
48,33
Solution:
Given numbers are 48 and 33
Factors of 48 = 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
Factors of 33 = 1, 3, 11
There are two common factors 1 and 3.
∴ 48 and 33 are not co-prime.

Question (v)
20, 57.
Solution:
Given numbers are 20 and 57
Factors of 20 = 1, 2, 4, 5, 10, 20
Factors of 57 = 1, 3, 19, 57
There is only only one (1) common factors.
∴ 20 and 57 are co-prime.

PSEB 6th Class Social Science Notes Chapter 1 Earth – As a Member of Solar System

November 24, 2021 by Bhagya

This PSEB 6th Class Social Science Notes Chapter 1 Earth – As a Member of Solar System will help you in revision during exams.

PSEB 6th Class Social Science Notes Chapter 1 Earth – As a Member of Solar System

→ Universe: The Universe is a vast and infinite space having millions of galaxies and heavenly bodies.

→ Galaxy Or Milky Way: A Galaxy is a group of millions of shining stars scattered in space. It is also known as Milky Way or Akash Ganga.

→ Star: A star is a celestial body having its own heat and light.

→ Planet: A planet is a heavenly body that revolves around the sun and receives heat and light from it.

→ Satellite: A satellite is a small spherical body that revolves around a particular planet.

→ Light Year: A light-year is a distance, which a ray of light would cover in a year’s time.

→ Solar System: The sun, planets, and other heavenly bodies combine together to form the solar system.

→ Sun-spots: The black spots on the bright face of the sun are called sun-spots.

→ Orbit: Orbit is the fixed path along which the planets revolve around the sun.

→ Comets: Comets are heavenly bodies with a head and a tail.

→ Saptarishi: A constellation of seven stars and a part of the Big Bear.

→ Asteroids: Tiny bodies found between the orbit of Mars and Jupiter.

→ Neil Armstrong: The first man to set foot on the moon.

→ Moon: Natural Satellite of the earth.

→ Celestial Bodies or Heavenly Bodies: All the objects like the sun, moon and bright objects seen during the night in the sky are called celestial bodies.

→ Constellation: A group of stars forming a particular pattern or design is called a constellation.

→ Geoid: Geoid means Earth-like shape.

→ Man-made satellites: Satellites carried by rockets and placed in the orbit of the earth

→ Meteoroids: Small pieces of rocks which revolve around the sun.

→ Full Moon: The night of Poornima when the moon shines in the form of a ball.

→ New Moon: The night of Amavasya when the moon is not seen from the earth.

→ On 23rd August, the International Astronomical Conference decided that Pluto should not be considered as a planet as it does not fulfill the essentials of a planet.

→ The distance between the earth and the sun is 150 million kms.

→ Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune are the 8 planets.

→ The earth has a circumference of 40,000 km.

→ The earth has an equatorial diameter of 12,756 km.

→ The distance between earth and moon is 3,76,275 km.

→ The sun is the nearest star to us.

→ The earth is the only planet having water and life.

→ The earth is a unique planet in the Solar System.

→ A light-year is a unit to measure the distance between the bodies of the universe.

→ Neil Armstrong and Edwin Aldrin were the first cosmonauts to land on the moon on 21st July 1969.

→ The universe is huge and it includes the sun, satellites, planets, stars, etc.

→ The power of attraction of the sun, planets are called gravity.

→ Diameter = 12,756 km & 12,712 km.

→ Circumference = 40,000 km.

→ Space: Space means sky.

→ Kalpana Chawla: Astronaut of Indian Origin.

→ Saptrishi: A constellation in Great Bear.

→ Speed of light: 3 Lakh km per second.

→ Milky way: Akash Ganga in India.

→ Apollo Project: To know more about Moon.

→ Tailed Star: A comet.

→ Gravity: Power of attraction of the Sun.

PSEB 6th Class Science Notes Chapter 16 Garbage Management and Disposal

November 24, 2021 by Bhagya

This PSEB 6th Class Science Notes Chapter 16 Garbage Management and Disposal will help you in revision during exams.

PSEB 6th Class Science Notes Chapter 16 Garbage Management and Disposal

→ Any substance which is no more useful is called waste.

→ Solid waste is called garbage. It is generated by human activities.

→ Garbage has both useful and non-useful components.

→ There are many types of wastes like industrial waste, domestic waste, agricultural waste, biomedical waste, etc.

→ Two types of garbage or solid waste are biodegradable wastes and non-biodegradable waste.

→ For proper disposal of garbage, we must do segregation before disposing of the garbage. We can do this by using differently colored dustbins.

→ To manage the waste there is the 4R’s i.e. reuse, reduce, recycle, refuse.

→ Some parts of the garbage can be reused.

→ Usually, garbage is collected and thrown in landfills.

→ Composting or vermicomposting can be done of useful components or biodegradable components of garbage.

→ Dry leaves, husk of wheat, and part of crops should not be burnt as they produce lots of smoke and harmful gases.

→ Red worms are good for vermicomposting of vegetable and fruit waste, coffee and tea leaves, weeds, etc. but oily, pickled, salty food, and milk products are not good for red worms.

→ Some types of plastics, paper, glass, and metal can be recycled.

→ Plastics bum with a foul smell and produce lots of harmful gases.

→ Plastic bags cause choking of drains and sewer systems.

→ Plastic bags eaten by animals are the cause of their death.

→ Plastic is useful as things made of them last long.

→ The incineration method releases harmful gases and causes pollution.

→ e-waste includes discarded mobiles or any electronic device.

→ Garbage: The solid waste is called garbage.

→ Dump: A large low-lying area used to dispose of garbage.

→ Landfill: A low-lying area to be filled by garbage is a landfill.

→ Biodegradable Waste: Waste material that can be decomposed by the action of microorganisms into harmless substances.

→ Non-biodegradable Waste: The waste materials that cannot be decomposed easily.

→ Incineration: The process of burning waste in closed containers.

→ Compost: The decomposition of organic material into useful material is compost.

→ Vermi-Composting: The method of preparing compost with the help of red worms is vermicomposting.

→ Gizzard: The teeth like hard structures present in red worms for grinding purposes is called the gizzard.

→ Recycling: The process of using a few materials, again and again, is recycling.

PSEB 9th Class Maths MCQ Chapter 3 Coordinate Geometry

November 24, 2021 by Bhagya

Punjab State Board PSEB 9th Class Maths Book Solutions Chapter 3 Coordinate Geometry MCQ Questions with Answers.

PSEB 9th Class Maths Chapter 3 Coordinate Geometry MCQ Questions

Multiple Choice Questions and Answer

Answer each question by selecting the proper alternative from those given below each question to make the statement true:

Question 1.
For x = 2, y = 3, u = – 2 and v = – 3, point (x + y, u + v) lies in the ……………. quadrant.
A. first
B. second
C. third
D. fourth
Answer:
D. fourth

Question 2.
For x = 4, y = – 5, u = – 6 and v = 8, point (x + y, u + v) lies In the quadrant.
A. first
B. second
C. third
D. fourth
Answer:
B. second

Question 3.
If (x, y) and (y, x) represent the same point in the coordinate plane, then is possible.
A. x = 5, y = 2
B. x = 2, y = 5
C. x = – 5. y = – 2
D. x = 5, y = 5
Answer:
D. x = 5, y = 5

Question 4.
The line Joining P(3, -2) and Q(3, 4)
A. is parallel to the x-axis
B. is parallel to the y-axis
C. is perpendicular to the y-axis
D. intersects both the axes
Answer:
B. is parallel to the y-axis

Question 5.
The line joining A(- 2, 5) and B(- 2, – 8)
A. is parallel to the x-axis
B. is perpendicular to the x-axis
C. intersects the y-axis
D. intersects both the axes
Answer:
B. is perpendicular to the x-axis

Question 6.
The line joining A (- 2, 5) and B (3, 5) intersects ……………….. .
A. the x-axis at (- 2, 0)
B. the x-axis at (3, 0)
C. the y-axis at (0, 5)
D. the x-axis at (5, 0)
Answer:
C. the y-axis at (0, 5)

Question 7.
The line joining A (3, 2) and B (3, – 2) intersects …………………….. .
A. the x-axis at (0, 3)
B. the x-axis at (3, 0)
C. the y-axis at (0, 2)
D. the y-axis at (0, – 2)
Answer:
B. the x-axis at (3, 0)

PSEB 6th Class Science Notes Chapter 15 Air Around Us

November 24, 2021 by Bhagya

This PSEB 6th Class Science Notes Chapter 15 Air Around Us will help you in revision during exams.

PSEB 6th Class Science Notes Chapter 15 Air Around Us

→ All living things require air to live.

→ Air is present everywhere around us however we cannot see the air.

→ Our earth is surrounded by a thin layer of air that extends upto many kilometres above the surface of the earth. This is known as the atmosphere.

→ Air is made up of water vapours, Oxygen, Nitrogen, Carbon dioxide, dust, and smoke.

→ Nitrogen and Oxygen are the main constituents of air and are present in large quantities.

→ In the air, nitrogen is 78% and oxygen is only 21%.

→ Oxygen is required for burning.

→ Carbon dioxide is a greenhouse gas.

→ The balance of Oxygen and Carbon dioxide in the atmosphere is maintained by the presence of living organisms (man, animals) and plants.

→ Carbon dioxide is used by plants for producing food by photosynthesis. They release oxygen.

→ Oxygen is consumed by animals and humans for respiration. They produce carbon dioxide.

→ Carbon dioxide is used as a fire extinguisher because carbon dioxide does not support g burning.

→ Air can be compressed and it also exerts pressure.

→ Moving air is called wind.

→ Moving air has the power to rotate a windmill which produces electricity.

→ Windmills are very useful as they produce electricity.

→ Air helps in the dispersal of seeds, pollens, and movement of sailing boats, yachts, gliders, aeroplanes, etc.

→ Dispersal of pollens is known as pollination.

→ Ozone present in the upper layer of the atmosphere protects us from the UV rays of the sun.

→ Air: It is a mixture of many gases like nitrogen, oxygen, carbon dioxide, water vapours, etc.

→ Wind: The moving air is wind.

→ Windmill: A device that is being rotated by air and is used for producing electricity.

→ Atmosphere: The thin blanket of air surrounding the earth constitutes the atmosphere.

PSEB 6th Class Science Notes Chapter 14 Water

November 24, 2021 by Bhagya

This PSEB 6th Class Science Notes Chapter 14 Water will help you in revision during exams.

PSEB 6th Class Science Notes Chapter 14 Water

→ Water is a vital resource and is considered a boon to live.

→ Water is present all over the earth.

→ Around the 3/4th part of the earth, the surface is covered with water.

→ The human body consists of 70% of water.

→ We need water for our daily activities and for producing other things.

→ Two main sources of water are surface water and groundwater.

→ Water exists in three states i.e. solid, liquid, and gas.

→ We get water from ponds, lakes, rivers, wells, etc.

→ Sea or Ocean water is salty. It is not fit for drinking and for domestic, agricultural, and industrial needs.

→ As water is a vital resource so it must be conserved.

→ Judicious use of water and saving it is conservation of water.

→ Rainwater is a pure form of water and is safe for drinking.

→ Rainwater harvesting is a technique that conserves water by storage of rainwater. This water can be reused for different useful purposes.

→ The water cycle is a cyclic process in which water is circulated between the earth and the atmosphere.

→ Ocean water supplies water to the water cycle and thus plays an important role.

→ Water from oceans, lakes, wet clothes and plants gets evaporated.

→ Clouds are just the condensation of evaporated water in the air.

→ Clouds cause rains and water returns to earth, oceans, lakes, etc.

→ Snow on mountains melts and water runs into rivers.

→ Water is also absorbed by the ground and becomes available to us as groundwater.

→ Heavy rains and no rains cause too many problems.

→ Heavy rains cause floods which destroy lives and properties.

→ Overflow of water in a large amount beyond its normal limits is known as a flood.

→ A flood is a natural disaster.

→ No rain or very little rain in a region is caused by the drought.

→ In drought conditions availability of food, fodder, and water become negligible.

→ With the increase of population, industries, and agriculture also increase which lay stress on the use of water.

→ Melting: The process of conversion of solid into liquid is called melting.

→ Freezing: The process of converting liquid into solid is called freezing.

→ Evaporation: The process of converting liquid into its vapours is called evaporation.

→ Transpiration: The process by which plants lose their water in the air is called transpiration.

→ Condensation: The process of conversion of water vapours into water is called condensation.

→ Precipitation: Falling of water in the form of rain and snow is called precipitation.

→ Clouds: The condensed water droplets join together to form clouds.

→ Water cycle: The evaporation of water to air, formation of clouds by condensation, and falling of rain on the earth constitutes the water cycle in nature.

→ Rainwater harvesting: Collection of rainwater for use at a time when it is not available otherwise is rainwater harvesting.

PSEB 9th Class Maths Solutions Chapter 3 Coordinate Geometry Ex 3.3

November 24, 2021 by Bhagya

Punjab State Board PSEB 9th Class Maths Book Solutions Chapter 3 Coordinate Geometry Ex 3.3 Textbook Exercise Questions and Answers.

PSEB Solutions for Class 9 Maths Chapter 3 Coordinate Geometry Ex 3.3

Question 1.
In which quadrant or on which axis does each of the points (- 2, 4), (3, – 1), (- 1, 0), (1, 2) and (- 3, – 5) lie? Verify your answer by locating them on the Cartesian plane.
Answer:
PSEB 9th Class Maths Solutions Chapter 3 Coordinate Geometry Ex 3.3 1

Coordinates of the point	Position of the point
(- 2, 4)	In the 2^nd quadrant
(3, – 1)	In the 4^th quadrant
(- 1, 0)	On the x-axis
(1, 2)	In the 1^st quadrant
(- 3, – 5)	In the 3^rd quadrant

Question 2.
Plot the points (x, y) given in the following table on the plane, choosing suitable units of distance on the axes:
PSEB 9th Class Maths Solutions Chapter 3 Coordinate Geometry Ex 3.3 2
Answer: