AP 10th Class Physical Science Model Paper Set 9 with Solutions

Solving AP 10th Class Physical Science Model Papers Set 9 regularly is an effective strategy for time management during exams.

AP SSC Physical Science Model Paper Set 9 with Solutions

Time: 2 Hours
Max. Marks: 50

Instructions:

• The question paper consists of 4 sections and 17 questions.
• Internal choice is available only for Q.No.12 in section III and for all the questions in section IV.
• In 2 hours, 15 minutes is allotted to read the question paper.
• All answers shall be written in the answer booklet only.
• Answers shall be written neatly and legibly.

Section – I (8 × 1 = 8 Marks)

Note:
1) Answer all the questions.
2) Each question carries 1 marks.

Question 1.
Predict and write why preparation of lime water is considered as an exothermic reaction.
Answer:
The preparation of lime water is regarded as an exothermic reaction because it releases heat during the process.

Question 2.
Acidic nature of a substance is due to the formation of ions in solution.
Answer:
H⁺(OR)H₃O⁺

Question 3.
Observe the following table:

Substance	Lemon juice	Blood	Milk of magnesia
pH value	2.2	7.4	10

In the above table which is strong acid?
Answer:
Lemon juice

Question 4.
Which is the most ductile metal in nature?
Answer:
Gold (OR) Au

Question 5.
Write any one use of vinegar.
Answer:
It is used as preservative in pickles.

Question 6.
The human eye forms the image of an object at its _____ .
a) Cornea
b) Iris
c) Pupil
d) Retina
Answer:
d (OR) Retina

Question 7.
Draw the symbol of an Ammeter.
Answer:

Question 8.
What is the commercial unit of electric energy?
Answer:
Kilowatt hour (OR) kWh

Section – II (3 × 2 = 6m)

Note:
1. Answer all the questions.
2. Each question carries 2 marks.

Question 9.
Fill the table:

Answer:
1. -OH
2. Carboxylic acid

Question 10.
Frame any two questions to understand the concept of refraction.
Answer:
i) What is the phenomenon of light refraction?
ii) Does light adhere to the laws of refraction during the process ?
iii) Can you provide examples of light refraction in everyday life ?

Question 11.
Predict and write why the tungsten is used as filament in electric lamps?
Answer:
Tungsten has a high resistivity and a high melting point, which makes it suitable for use as a filament in electric lamps.

Section – III (3 × 4 = 12M)

Note:
1) Answer all the questions.
2) Each question carries 4 marks.

Question 12.
Draw any one of the following diagrams.
A) Draw the ray diagrams of image formed when the ob ject is placed in front of a concave mirror in the following positions:
i) at ‘C’
ii) between P and F
Answer:
i) at ‘C’

ii) between P and F

B) Draw the diagram which shows that acid solution in water conducts electricity.
Answer:

Question 13.
Give two important uses of each of the following:
1) Bleaching powder
2) Baking soda
Answer:
Uses of Bleaching powder:

1. For bleaching cotton and linen in the textile industry.
2. For bleaching wood pulp in paper mills.
3. For bleaching washed clothes in laundries.
4. As an oxidizing agent in various chemical industries,
5. To purify drinking water by eliminating germs.

Uses of Baking Soda:

1. In the production of baking powder.
2. As an ingredient in antacids.
3. In soda-acid fire extinguishers.

Question 14.

Material medium	Air	Rock salt	Water	Diamond	Benzene
Refractive index	1.0003	1.54	1.33	2.42	1.50

Answer:
i) Diamond
ii) Diamond
iii) Air
iv) Air
Observe the above table and answer the following questions.
i) Which medium has highest optical density?
ii) In which medium speed of light is minimum?
iii) In which medium the light travels faster?
iv) Which medium has least optical density?

Section – IV (3 × 8 = 24M)

Note:
1) Answer all the questions.
2) Each question carries 8 marks.
3) Each question has an internal choice.

Question 15.
Explain what is Myopia and how can you rectify it.
Answer:
Myopia:

1. Myopia is commonly referred to as near-sightedness.
2. A person with myopia can clearly see nearby objects but struggles to distinguish distant objects.
3. In individuals with this condition, the far point is closer than infinity, and they can only see clearly up to a few meters.
4. In a myopic eye, the image of a distant object is formed in front of the retina.
5. This defect may occur due to:
   • Excessive curvature of the eye lens, or
   • Elongation of the eyeball.
6. Myopia can be corrected using a concave lens of appropriate power.

(OR)
Define the following terms :
i) Electric current
ii) Potential difference
iii) Electric Resistance
iv) Electric power
Answer:
i) Electric Current: Electric current is the amount of charge passing through a specific area of an electric conductor per unit of time. It is given by the formula I = Qt.

ii) Potential Difference: The electric potential difference between two points in a cir-cuit carrying current is the work done to move a unit charge from one point to the other.
It is expressed as V = Q/W.

iii) Electric Resistance: Resistance is a property that opposes the flow of electrons in an electric conductor.

iv) Electric Power: Electric power is the rate at which electrical energy is consumed in a circuit, and is given by the formula P = VI.

Question 16.
Write the balanced chemical equations for the following reactions.
a) Calcium hydroxide + Carbon dioxide ? Calcium carbonate + Water
b) Zinc + Silver nitrate ? Zinc nitrate + Silver
c) Aluminium + Copper chloride ? Aluminium chloride + Copper
d) Barium chloride + Potassium sulphate ? Barium sulphate + Potassium chloride
Answer:
a) Ca(OH)₂ + CO₂ → CaCO₃ + H₂O
b) Zn + 2AgNO₃ → Zn(NO₃)₂ + 2Ag
c) 2Al + 3Cucl₂ → 2AlCl₃ + 3Cu
d) BaCl₂ + K₂SO₄ → BaSO₄ + 2KCl

(OR)
Explain the mechanism of the cleaning action of soaps.
Answer:

1. Soaps are molecules with two distinct ends: one is hydrophilic, meaning it interacts with water, while the other is hydrophobic, meaning it interacts with hydro¬carbons.
2. When soap is placed on the surface of water, its hydrophobic ‘tail’ doesn’t dissolve in water. The soap molecules arrange themselves along the water’s surface, with the ionic end in the water and the hydrocarbon tail sticking out.
3. Inside the water, these molecules orient themselves in such a way that the hydro carbon portion is kept away from the water.
4. As a result, clusters of soap molecules form, with the hydrophobic tails on the in side and the ionic ends on the outside of the cluster.
5. This arrangement is called a micelle. Soap, In the form of a micelle, is effective at cleaning because it traps oily dirt in the center of the micelle.
6. The micelles remain suspended In solution as a colloid and do not clump together due to ion-ion repulsion.
7. Therefore, the dirt trapped within the micelles can easily be rinsed away.

Question 17.
Explain the experimental procedure to show that a current-carrying conductor placed in a magnetic field experiences force on it.
Answer:
Aim To demonstrate that a current-carrying conductor experiences a force when placed in a magnetic field.
Materials Required: Aluminium rod, horseshoe magnet, stand, battery, plug key, connecting wires, rheostat.

Procedure:

1. Take a small aluminium rod (AB) and suspend it horizontally from a stand using two connecting wires, as shown in the figure.
2. Position a strong horseshoe magnet so that the rod is placed between the two poles, with the magnetic field directed upwards,
3. Connect the aluminium rod in series with a battery, a key, and a rheostat,
4. Allow current to pass through the aluminium rod, starting from end ‘B’ to end ‘A’,

Observations:
1. It is observed that the rod is displaced to the left,
2. If the direction of the current is reversed, the rod is displaced to the right.

Conclusion: This activity demonstrates that a force is exerted on a current-carrying conductor when it is placed in a magnetic field.

(OR)
Explain the experimental procedure to investigate the conditions under which iron rusts.
Answer:
Aim: To investigate the conditions under which iron rusts,
Materials Required: Three test tubes, clean iron nails, distilled water, oil, anhydrous calcium chloride, and water.

Procedure:

1. Take three test tubes and place clean iron nails in each of them.
2. Label the test tubes A, B, and C, Fill test tube A’ with some water and cork it.
3. Fill test tube ‘B’ with boiled distilled water, add about 1ml of oil, and cork it.
4. Place some anhydrous calcium chloride in test tube ‘C and cork it. Leave the test tubes undisturbed for a few days,

Observations:
1. The iron nails rust in test tube A’ but do not rust in test tubes ‘B’ and ‘C’.
2. In test tube A’, the nails are exposed to both air and water. In test tube ‘B’, the nails are exposed only to water, while in test tube ‘C’, the nails are exposed only to dry air.

Conclusion: From the experiment we conclude that both air and water are essential for the rusting of iron.