Science Outside Delhi Set 3 2023-2024 English Medium Class 10 Question Paper Solution

An iron nail is placed in a solution of copper sulphate.

The nail is taken out after 15 minutes. The nail will be found to be covered with ______.

blue deposit

brown deposit

grey deposit

green deposit

Consider the following cases:

1. \[\ce{CaSO4 + Al ->}\]
2. \[\ce{CuSO4 + Ca ->}\]
3. \[\ce{FeSO4 + Cu ->}\]
4. \[\ce{ZnSO4 + Mg ->}\]

The cases in which new products will form are:

a and b

b and c

c and d

b and d

Which of the following reactions is an endothermic reaction?

Burning of coal

Decomposition of vegetable matter into compost

Process of respiration

Decomposition of calcium carbonate to form quick lime and carbon dioxide.

The oxide which can react with \[\ce{HCl}\] as well as \[\ce{KOH}\] to give corresponding salt and water is:

\[\ce{CuO}\]

\[\ce{Al2O3}\]

\[\ce{Na2O}\]

\[\ce{K2O}\]

Juice of tamarind turns blue litmus to red. It is because of the presence of an acid called ______.

methanoic acid

acetic acid

tartaric acid

oxalic acid

Consider the following statements about homologous series of carbon compounds:

1. All succeeding members differ by - \[\ce{CH2}\] unit.
2. Melting point and boiling point increases with increasing molecular mass.
3. The difference in molecular masses between two successive members is 16 u.
4. \[\ce{C2H2}\] and \[\ce{C3H4}\] are NOT the successive members of alkyne series.

The correct statements are:

a and b

b and c

a and c

c and d

Identify the correct statement about the following reaction:

\[\ce{2H2S + SO2 → 2H2O + S}\]

\[\ce{H2S}\] is oxidising agent and \[\ce{SO2}\] is reducing agent.

\[\ce{H2S}\] is reduced to sulphur.

\[\ce{SO2}\] is oxidising agent and \[\ce{H2S}\] is reducing agent.

\[\ce{SO2}\] is oxidised to sulphur.

In the given diagram the leaf shown belongs to which plant?

Hibiscus

Money plant

Mustard

Bryophyllum

Which of the following endocrine gland does not occur as a pair in the human body?

Adrenal

Pituitary

Testis

Ovary

In human respiratory system, when a person breathes in, the position of ribs and diaphragm will ______.

lifted ribs and curve/dome shaped diaphragm.

lifted ribs and flattened diaphragm.

relaxed ribs and flattened diaphragm.

relaxed ribs and curve/dome shaped diaphragm.

Which of the following statement(s) is (are) true about human heart?

1. Right atrium receives oxygenated blood from lungs through pulmonary artery.
2. Left atrium transfers oxygenated blood to left ventricle which sends it to various parts of the body.
3. Right atrium receives deoxygenated blood through vena cava from upper and lower body.
4. Left atrium transfers oxygenated blood to aorta which sends it to different parts of the body.

a

b and d

a and d

b and d

A cross made between two pea plants produces 50% tall and 50% short pea plants. The gene combination of the parental pea plants must be ______.

Tt and Tt

TT and Tt

Tt and tt

TT and tt

Study the I-V graph for three resistors of resistances R₁, R₂ and R₃ and select the correct statement from the following:

R₁ = R₂ = R₃

R₁ > R₂ > R₃

R₃ > R₂ > R₁

R₂ > R₃ > R₁

The maximum resistance of a network of five identical resistors of `1/5  Omega` each can be ______.

1 Ω

0.5 Ω

0.25 Ω

0.1 Ω

The speed of light in vaccum is 3 x 10⁸ m/s. If the speed of light in a medium is 2.25 x 10⁸ m/s, the absolute refractive index of the medium is ______.

`7/6`

`5/4`

`4/3`

`3/2`

Study the following statements:

1. A fuse in a circuit prevents damage to the circuit due to overloading.
2. Total resistance in a circuit increases due to overloading.
3. During short circuiting the current in the circuit abruptly increases.
4. In order that each appliance has same current, they are connected in parallel to each other.

The correct statements are:

a and b

b and d

a and c

a, c and d

Assertion (A): Carbon reduces the oxides of Sodium and Magnesium.

Reason (R): Sodium and Magnesium have more affinity for Oxygen than Carbon.

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true, but (R) is not the correct explanation of (A).

(A) is true, but (R) is false.

Assertion (A): The deflection of a compass needle placed near a current carrying wire decreases when the magnitude of an electric current in the wire is increased.

Reason (R): Strength of the magnetic field at a point due to a current carrying conductor increases on increasing the current in the conductor.

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true, but (R) is not the correct explanation of (A).

(A) is true, but (R) is false.

(A) is false, but (R) is true.

Assertion (A): The colour of clear sky appears blue.

Reason (R): Light of blue colour has longer wavelength as compared to the light of red colour. So, it is scattered more in the upper atmosphere.

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true, but (R) is not the correct explanation of (A).

(A) is true, but (R) is false.

Assertion (A): Human female has a perfect pair of sex chromosome.

Reason (R): Sex chromosome contributed by the human male in the zygote decides the sex of a child.

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true, but (R) is not the correct explanation of (A).

(A) is true, but (R) is false.

(A) is false, but (R) is true.

Give one example of the following:

Chemical reaction showing evolution of gas.

Give one example of the following:

Change in the colour of the substance during a chemical reaction.

Translate the following statement into chemical equation and then balance it.

Hydrogen sulphide gas burns in the air to give water and sulphur dioxide.

Translate the following statement into chemical equation and then balance it.

Silver bromide on exposure to sunlight decomposes into silver and bromine.

Name the blood vessel that brings blood to the kidneys. 

Why is nephron called a basic filtration unit of kidney?

Write the role of tubular part of nephron in urine formation.

Mendel crossed a round and yellow seeded pea plant with a wrinkled and green seeded pea plant. What did the plants of F₁ generation look like in terms of shape and colour of seed? On self pollinating F₁ generation plants, plants with four types of combinations of characters were seen in F₂ generation. Write the combinations along with their ratios.

Use Ohm's law to determine the potential difference across the 3 Ω resistor in the circuit shown in the following diagram when key is closed:

A person suffering from an eye defect uses lenses of power −1 D. Name the defect of vision and list its two causes. State the nature (converging/diverging) of the correcting lens.

What is presbyopia?

Name the type of lenses used for the correction of presbyopia defect.

State the nature (converging/diverging) of the upper part of presbyopia lenses.

Name the term used for the materials which cannot be broken down by biological processes. Give two ways by which they harm various components of an ecosystem.

Why is sodium kept immersed in kerosene oil?

Some metal oxides are soluble in water. What are the aqueous solutions of these oxides called? Write one example of such a solution.

At ordinary temperature the surface of metals such as magnesium, aluminium, zinc etc. is covered with a thin layer. What is the composition of "this layer? State its importance.

It is observed that Calcium on reaction with water floats on its surface. Explain why it happens. Also write a balanced chemical equation for the reaction that occurs. What happens when the aqueous solution of the product of this reaction reacts with Carbon dioxide gas? Write a balanced chemical equation for the reaction.

List any two contraceptive methods practised only by women. Mention how these methods work.

List two functions performed by the testis in human beings.

Give reasons for the following:

Alveoli in lungs are richly supplied with blood capillaries.

Give reasons for the following:

Respiratory pigment in the blood takes up oxygen and not carbon dioxide.

Give reasons for the following:

During anaerobic respiration, a 3-carbon molecule is formed as an end product instead of CO₂ in human beings.

Name the movements that occur all along the gut in human digestive system. How do they help in digestion?

Where is bile juice stored in human body?

List two roles of bile juice.

Define the term "power of accommodation" of human eye.

Write the name of the part of eye which plays a major role in the process of accommodation.

Explain what happens when human eye focuses nearby objects.

Explain what happens when human eye focuses distant objects.

Draw a ray diagram to show the formation of a rainbow in the sky. On this diagram mark A where dispersion of light occurs, B where internal reflection of light occurs and C where refraction of light occurs.

List two necessary conditions to observe a rainbow.

Define the term solenoid.

Draw the pattern of magnetic field lines around a current carrying solenoid. State how this magnetic field can be used to magnetise a piece of magnetic material, like soft iron.

Use of pesticides to protect our crops affect organisms at various trophic levels especially human beings. Name the phenomenon involved and explain how does it happen.

Distinguish between hormonal co-ordination in plants and animals.

Which part of the brain is responsible for intelligence?

Which part of the brain is responsible for riding a bicycle?

Which part of the brain is responsible for vomiting?

Which part of the brain is responsible for controlling hunger?

How is human brain protected from mechanical injuries and shocks?

What are tropic movements?

Name one plant hormone that promotes growth and another plant hormone which inhibits growth.

Give an example of a plant hormone which promotes cell division.

Explain directional movement of a tendril in pea plant in response to touch. Name the hormone responsible for this movement.

Upper half of a convex lens is covered with a black paper. Draw a ray diagram to show the formation of image of an object placed at a distance of 2F from such a lens. Mention the position and nature of the image formed. State the observable difference in the image obtained if the lens is uncovered. Give reason to justify your answer.

An object is placed at a distance of 30 cm from the optical centre of a concave lens of focal length 15 cm. Use lens formula to determine the distance of the image from the optical centre of the lens.

State the reason why carbon can neither form \[\ce{C^4+}\] cations nor \[\ce{C^4−}\] anions but forms covalent compound.

What is meant by homologous series of carbon compounds?

Write the molecular formula of two consecutive members of homologous series of aldehydes. State which part of these compounds determines their

1. physical and 
2. chemical properties

Write the molecular formula and structure of cyclohexane. How many covalent bonds are there in a molecule of cyclohexane?

1. Name a commercially important carbon compound having functional group - OH and write its molecular formula.
2. Write chemical equation to show its reaction with
   1. Sodium metal
   2. Excess conc. sulphuric acid
   3. Ethanoic acid in the presence of an acid catalyst
   4. Acidified potassium dichromate
      Also write the name of the product formed in each case.

1. Which of the cut pieces of the two Planaria could regenerate to form a complete organism?         1
2. Give an example of another organism that follows the same mode of reproduction as Planaria.         1
3. What is the meaning of 'development' in regeneration?         2
                                  OR
   Differentiate between regeneration and fragmentation.         2

1. List two properties of heating elements.   1
2. List two properties of electric fuse.   1
3. Name the principle on which an electric fuse works. Explain how a fuse wire is capable of saving electrical appliances from getting damaged due to accidently produced high currents.   2
                                      OR
   The power of an electric heater is 1100 W. If the potential difference between the two terminals of the heater is 220 V, find the current flowing in the circuit. What will happen to an electric fuse of rating 5 A connected in this circuit?   2

1. Identify the acid and base from which Sodium chloride is formed.   1
2. Find the cation and the anion present in Calcium sulphate.   1
3. "Sodium chloride and washing soda both belong to the same family of salts." Justify this statement.   2
                                                    OR
   Define the term pH scale. Name the salt obtained by the reaction of Potassium hydroxide and Sulphuric acid and give the pH value of its aqueous solution.   2