Text Book Solutions All Class

MCQ Questions:

Q1: The Earth rotates on its axis in approximately how many hours?

a) 12 hours

b) 24 hours

c) 48 hours

d) 365 days

Q2: What causes the day and night cycle on Earth?

a) The Earth’s revolution around the Sun

b) The Earth’s rotation on its axis

c) The Sun’s movement across the sky

d) The Moon’s orbit around the Earth

Q3: Which direction does the Earth rotate in?

a) From East to West

b) From West to East

c) From North to South

d) From South to North

Q4: A total solar eclipse occurs when:

a) The Earth moves between the Moon and the Sun

b) The Moon moves between the Earth and the Sun

c) The Sun moves between the Earth and the Moon

d) The Earth moves away from the Sun

Q5: Why do we experience different seasons on Earth?

a) Due to the Earth’s rotation

b) Due to the tilt of the Earth’s axis

c) Due to the Moon’s position

d) Due to the Earth’s distance from the Sun2. Fill in the Blanks:

Q1: The Earth completes one revolution around the Sun in __________ days.

Q2: The Earth’s axis is tilted at an angle of __________ degrees with respect to its orbit.

Q3: The Moon can block sunlight from reaching the Earth, causing a __________ eclipse.

Q4: The Sun rises in the __________ and sets in the __________.

Q5: During a lunar eclipse, the Earth comes between the __________ and the Moon.3. True/False Questions:

Q1: The Earth’s rotation causes the cycle of day and night.

Q2: During a solar eclipse, the Earth moves between the Sun and the Moon.

Q3: The Moon is larger than the Sun, so it can block the Sun’s light completely during a solar eclipse.

Q4: The Sun’s light gets blocked during a lunar eclipse.

Q5: The tilt of the Earth’s axis is responsible for the changing seasons.Very Short Answer Questions:

Q1: What is the cause of the apparent motion of the Sun in the sky?

Q2: Why do we experience different seasons on Earth?

Q3: What is a solar eclipse?

Q4: What is a lunar eclipse?

Q5: In which direction does the Earth rotate?Long Answer Questions:

Q1: Explain the phenomenon of day and night on Earth.

Q2: Describe the process of a solar eclipse and how it occurs.

Q3: What is the effect of the Earth’s tilt on the seasons?

Q4: How does the Earth’s rotation lead to the apparent motion of stars in the sky?

Q5: What are the differences between a solar eclipse and a lunar eclipse?

You can find Worksheets Solutions here:  Worksheet Solutions: Earth, Moon, and the Sun​

 True/False

(a)  The Moon is a luminous object.

(b) Transparent materials allow no light to pass through.

(c) A kaleidoscope forms changing symmetrical patterns using mirrors.

(d) Light can travel through a bent pipe easily.

(e) A plane mirror forms a virtual image.

Fill in the blanks.

(a) Objects that emit their own light are called ___________.

(b) Light travels in a __________ line under normal conditions.

(c) An image formed by a plane mirror is laterally __________.

(d) Opaque objects form the __________ shadows.

(e) A __________ camera forms an inverted image on a screen.

Answer the Following Questions

Q.1. What is a luminous object?

Q.2. Give one example of a translucent material.

Q.3. What is the direction of light travel called?

Q.4. Which device uses two mirrors to see over obstacles?

Q.5. What do we call the left-right reversal in a mirror image?

Q.6. What happens when light falls on a polished or a shiny surface?

Q.7. What is reflection of light?

Q.8. Why we are not able to see the candle flame through a bent pipe?

Q.9. How can we change the path of light?

Q.10. What happens when light falls on a mirror?

​

​You can find Worksheets Solutions here: Worksheet Solutions: Light 

True/False

(i) The food synthesized by the plants is stored as starch.

(ii) Plants take carbon dioxide from the atmosphere mainly through their leaves.

(iii) Only green leaves can perform photosynthesis.

(iv) Starch turns blue-black when tested with iodine.

(v) Phloem carries water and minerals from the soil.

Fill in the Blanks 

(i) In photosynthesis solar energy is captured by the pigment called ____.

(ii) During photosynthesis plants take in ____ and release ____ .

(iii) ____ in plant take in carbon dioxide from the air for photosynthesis.

(iv) ____ are the products of photosynthesis.

(v) Food made by leaves is transported by the __________.

(vi) During respiration, plants use __________ to break down glucose.

Answer the Following Questions

Q.1. From where do plants get raw materials to prepare their food? 

Q.2. What is the ultimate source of energy for all living organisms?

Q.3. What are the other parts of plant where photosynthesis occurs except leaves?

Q.4. What are stomata?

Q.5. What is chlorophyll?

Q.6. What is plant respiration and how is it different from photosynthesis?

Q.7. Why do we boil the leaf in alcohol when we are testing it for starch?

Q.8. What is the role of leaves in food preparation? How is starch tested in a leaf?

Q.9. Describe how water and minerals are transported in plants.

Q.10. How do plants transport food to different parts of the body?

You can find Worksheets Solutions here: Worksheet Solutions: Nutrition in Plants 

Q.1. True/False

(i) Digestion of starch starts in the stomach.

(ii) The tongue helps in mixing food with saliva.

(iii) The gall bladder temporarily stores bile.

(iv) The ruminants bring back swallowed grass into their mouth and chew it for some time. 

(v) We chew the food with the teeth and break it down mechanically into small pieces. 

(vi) Large intestine receives digested and absorbed food. 

Q.2. Fill in the blanks.

(i) The main steps of nutrition in humans are ____, ____, ____, ____ and ____.

(ii) The largest gland in the human body is ____.

(iii) The stomach releases hydrochloric acid and ____ juices which act on food.

(iv) The inner wall of the small intestine has many finger-like outgrowths called ____.

(v) Amoeba digests its food in the food ____.

​(vi) We chew the food with the ____ and break it down mechanically into small pieces.

Answer the following Question

Q.3. Where are fats digested in the body?
Q.4. What kills bacteria that enter along with the juices to act?
Q.5. Where are faeces formed in the human body?
Q.6. Where food is absorbed in our body?

Q.7. Where faeces are stored?

Q.8. What does saliva do to food in our mouth?

Q.9. What is rumen?

Q.10. What does animal nutrition include?

Q.11. What are the different modes of feeding in animals?

Q.12. What are ruminant animals?

Q.13. What do pancreatic juices digest?

Q.14. What do you mean by rumination? 

Q.15. What are the main steps involved in the process of respiration in animals? 

Q.1. True or False

(i) The SI unit of speed is kilometre per hour.

(ii) Candle clocks were used to measure time in ancient India.

(iii) In non-uniform motion, the speed of the object remains the same.

(iv) All pendulums of the same length have the same time period at the same location.

(v) Distance is measured in metres and time in seconds.

Q.2. Fill in the blanks.
(i)  The metallic ball is called the ____ of the pendulum.

(ii) The symbols of all units are written in ____.

(iii) The time taken by the pendulum to complete one oscillation is called its ____.

(iv) One microsecond is one ____ of a second.

(v) A nanosecond is one ____ of a second.

(vi) The distance-time graph for the motion of an object moving with a constant speed is a ____.

Answer the following Questions 

Q.3. Give an example of oscillatory motion.
Q.4. What is uniform motion?

Q.5. An object moving along a straight line with a constant speed is said to be in uniform motion.

Q.6. What is distance-time graph?
Q.7. What is oscillatory motion?

Q.8. What is non-uniform motion?
Q.9. What is the basic unit of speed?

Q.10.  A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?

Q.11. When pendulum is said to have one complete oscillation?

Q.12. Explain how in ancient time a day, a month and a year were measured?
Q.13. The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.

Q.14. Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.

Q.15. What is speedometer?

Q.16. What are quartz clocks?

Q.1. True/False

(i) Metals are poor conductors of heat.

(i) Land breeze occurs during the night.

(i) Dark-colored clothes absorb less heat than light-colored clothes.

(i) Water vapor released by plants is called transpiration.

(i) Radiation requires air or water to transfer heat.

Q.2. Fill in the blanks.

(i)  The hotness of an object is determined by its ____.

(ii) Temperature is measured in degree ____.

(iii) A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of ____.

(vi) Dark colored clothes are preferred during ____.

(v) Poor conductors are known as ____.

Answer the following Questions 

Q.3. Does the transfer of heat by radiation require any medium?

Q.4. What is the concern associated with the use of mercury thermometers?

Q.5. How water get heated when kept on flame?

Q.6. Which device is used to measure temperature?

Q.7. How does heat flow from one object to another?

Q.8. Do all hot bodies radiate heat?

Q.9. How does heat transfer in solids?

Q.10. What is Conduction?

Q.11. Explain the process of conduction with an example.

Q.12. What is convection and how does it affect coastal areas?

Q.13. Describe radiation and give two real-life applications.

Q.14. How does the water cycle help in redistributing water on Earth?

Q.15. What are ice stupas and how do they help conserve water in Ladakh?

You can find Worksheets Solutions here: Worksheet Solutions: Heat

Q1: What is the main reason for the development of pimples during adolescence?

a) ​Lack of sleep

b) Increase in oily secretions from the skin

c) Excessive washing of the face

d) Change in diet

Q2: What is the term used to describe the natural signs that the body is preparing for adulthood?

a) Puberty

b) Maturity

c) Secondary sexual characteristics

d) Adolescence

Q3: At what age does adolescence typically begin?

a) 5–6 years

b) 10–12 years

c) 13–14 years

d) 19–20 years

Q4: What does the onset of the menstrual cycle in girls indicate?

a) Beginning of adolescence

b) The start of puberty

c) Both a and b

d) End of childhood

Q5: Which of the following is a secondary sexual characteristic in boys?

a) Development of breasts

b) Voice deepening

c) Menstruation

d) None of the above2. Fill in the Blanks:

Q1: The stage of life when the body undergoes changes to prepare for adulthood is called __________.

Q2: The growth of facial hair in boys is one of the __________ sexual characteristics that occur during adolescence.

Q3: The natural process in adolescent girls that involves the release of blood is called __________.

Q4: During adolescence, boys and girls experience growth in __________ in the pubic region and underarms.

Q5: __________ refers to the time period when the body undergoes internal and external changes to reach reproductive capability.3. True/False Questions:

Q1: Adolescence is marked only by physical changes in the body.

Q2: The onset of menstruation is an important internal change in adolescent girls.

Q3: Acne is a common skin condition that may develop due to increased oily secretions during adolescence.

Q4: Boys and girls develop the same type of secondary sexual characteristics during adolescence.

Q5: The menstrual cycle is an indicator of a girl’s reproductive health.Very Short Answer Questions:

Q1: What are secondary sexual characteristics?

Q2: What is menstruation?

Q3: Why do boys experience voice changes during adolescence?

Q4: How does physical activity help adolescents?

Q5: What is the role of hormones during adolescence?Long Answer Questions:

Q1: Explain the physical and emotional changes that occur during adolescence.

Q2: How can adolescents manage emotional changes effectively?

Q3: What are the key nutritional needs of adolescents, and why are they important?

Q4: What is the significance of the menstrual cycle in adolescent girls?

Q5: Discuss the impact of substance abuse during adolescence and the importance of saying ‘NO’ to harmful substances.

You can find Worksheets Solutions here: Worksheet Solutions: Adolescence: A Stage of Growth and Change

Q.1. True/False

(i) Rusting of iron is a physical change.

(ii) Evaporation of water is a reversible change.

(iii) All physical changes are reversible.

(iv) Burning of magnesium ribbon produces a white powder.

(v) Bioluminescence produces light without heat.

Q.2. Fill in the blanks.

(i) Cutting a log of wood into pieces is a ____ change.

(ii) Condensation is a ____ change.

(iii) When carbon dioxide is passed through lime water, it turns milky due to the formation of ____.

(iv) Two methods by which rusting of iron can be prevented are ____ and ____.

(v)  Changes in which only ____ properties of a substance change are called physical changes.

(vi)  A medicine is the end product of a chain of ____.

​Answer the following Questions

Q3. What is the white substance formed when lime water reacts with carbon dioxide?

Q4. What kind of change is chopping vegetables?

Q5. Name the three requirements of the fire triangle.

Q6. Which process breaks down rocks into soil over time?

Q7. What kind of change is melting wax?

Q8. What happens when magnesium ribbon is burnt in air?
Q.9. What do you understand by chemical change?
Q.10. Why formation of manure from leaves is a chemical change?

Q.11. Why tearing of paper into pieces is a physical change?

Q.12. What is rusting?

Q.13. Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.

Q.14. What is a physical change?

Q.15. Explain the changes that occur when a candle burns.

​You can find Worksheets Solutions here: Worksheet Solutions: Physical and Chemical Changes