Science Part 1 – July 2024 Board Question paper

Q.1(A) MCQ, Choose the correct alternative: (05 Marks)

In modern periodic table the non-metals are found in…….. (A) s-block. (B) p-block. (C) d-block. (D) f-block. Correct Answer: (B) p-block
CuSO4(aq) + Zn(s) → ZnSO4(aq) + Cu(s). This is a type of chemical reaction? (A) displacement (B) double displacement. (C) combination. (D) decomposition. Answer: (A) displacement
The unit of electric power is ? (A) Joule. (B) Volt. (C) Watt. (D) Coulomb. Answer: (C) Watt
We can see the sun even when it is little below the horizon because of…… (A) reflection of light. (B) refraction of light. (C) dispersion of light. (D) absorption of light. Answer: (B) refraction of light.
…………is one of the combustible components of L.P.G. ? (A) Ethane. (B) Propane. (C) Methane. (D) Ethene. Answer: (B) Propane

Q.1(B) Answer the following. (5M)

Write the correlation: Brass: Copper and Zinc : : Bronze: ….. ? Answer: Tin and Copper.
Write True or False: Benzene is an aromatic compound. True or false ? Answer: True
Find the odd one out: Myopia, Presbyopia, Hypermetropia, Retina Answer : Retina (The others are eye defects)
Question – What is the angle of refraction when the angle of incidence is 0°? Answer: 0°
Write Name two appliances which work on the principle of the magnetic effect of electric current. Answer: Electric motor, Electric bell, Loudspeaker

Q.2 (A) Give scientific reasons. (any two). (4M)

Sodium is always kept in kerosene.
A simple microscope is used for watch repairs.
It is necessary to manage the space debris.

Q.2 (B) Answer the following questions. (any three): (6M)

The absolute refractive index of water is 1.33. What is the velocity of light in water?
Observe the figure and answer the questions given below…..

Questions

i) Name the phenomenon shown in the figure.

ii) Define the above phenomenon.

3. Observe given chemical reaction and answer two questions

i. Identify the following reaction

ii. Name the reaction at point ‘A’ and point ‘B’

4. Rearrange the columns 2 and 3 so as to match with the column 1.

5. Define the following terms:- 1) Escape velocity. 2) Free fall

Q.3. Answer the following questions. (any five) (15 Marks)

What information will you get from the given reaction: CaCO3 (s) → CaO (s) + CO2(g)↑

2. Observe the following ray diagram and answer the questions given below

A. Identify the instrument shown in the diagram.

B. What is the combined effect of two lenses?

C. Write the use of the above instrument.

3. Read the following paragraph and answer the questions given below:

Rainbow is a beautiful natural phenomenon. It is the combined effect of dispersion, refraction and total internal reflection of light. It can be seen mainly after rainfall. Small droplets of water act as small prisms. When light rays from the sun enter these droplets it gets refracted and dispersed. Then there is internal reflection and after that once again the light gets refracted while coming out of the droplet. All these three processes together produce the rainbow.

A. Which three major phenomena are responsible for rainbow formation?

B. How does refraction take place?

C. Draw a diagrammatic representation of rainbow production.

Q.4. From the elements of second period of the modern periodic table given below, answer the following questions:

Atomic number: 3-Li 4-Be 5-B 6-C 7-N 😯 9-F 10-Ne

A. Name the elements in which both the shells are completely filled with electrons.

B. Name the element which has same number of electrons in both the shells.

C. Which is the most electropositive element in this period?

Q.5 Explain on which factor the value of acceleration due to gravity ‘g’ depends.

Q.6 Explain the following terms: A. Metallurgy. B. Ores. C. Gangue.

Q.7. Give the names of the following satellite series developed by India:

A. Satellite series actively working in the field of telecommunication, television and meteorological services.

B. Satellite series specially working in the field of education.

C. Satellite series to exactly locate position of any place on earth’s surface.

Q.8. sub question no. A. What is meant by anomalous behaviour of water? ( 01 mark )

B. Explain the role of anomalous behaviour of water in preserving aquatic life in cold climate. ( 02 Marks)

Q.4 Answer the following question. anyone (5 marks)

observe the following diagram and answer the following question.

(a) Identify the above diagram
(b) Write the principle on which the above appliance works?
(c) Write the working of the above appliance.
(d) Write the use of the above appliance.

2. Read the following paragraph and answer the questions given below:

Carbon compounds contain many elements. The element hydrogen is present to a smaller or larger extent in majority of carbon compounds. The compounds which contain carbon and hydrogen as the only two elements are called hydrocarbons. Hydrocarbons are the simplest and the fundamental organic compounds. The smallest hydrocarbon is methane (CH). formed by combination of one carbon atom and four hydrogen atoms. We have already seen the structure of methane. Ethane is one more hydrocarbon. Its molecular formula is C₂H6 The carbon compounds having a double bond or triple bond between two carbon atoms are called unsaturated compounds. Ethene and ethyne are unsaturated hydrocarbons. The unsaturated hydrocarbons containing a carbon-carbon double bond are called ‘Alkenes‘. The unsaturated hydrocarbons whose structures contain a carbon-carbon triple bond are called ‘Alkynes’. Generally the unsaturated compounds are more reactive than the saturated compounds.