SSC Board Exam 2025 SCIENCE AND TECHNOLOGY PART 1 Question Paper With Answer PDF
SSC Board Exam 2025 SCIENCE AND TECHNOLOGY PART 1 Question Paper With Answer PDF
SSC Board Exam 2025 SCIENCE AND TECHNOLOGY PART 1 Question Paper With Answer PDF
STD 10th Exam 2025 SCIENCE AND TECHNOLOGY PART 1 Answer Key
SCIENCE AND TECHNOLOGY (72) – PART I (E)
(REVISED COURSE)
SCIENCE AND TECHNOLOGY PART-1
STANDARD TEN
2025 III 10 1100-N 840-N 840 Seat No.
Time: 2 Hours
Max. Marks: 40
Note:
(i) All questions are compulsory.
(ii) Use of a calculator is not allowed.
(iii) The numbers to the right of the questions indicate full marks.
(iv) In case of MCQs [Q. No. 1(A)] only the first attempt will be evaluated and will be given credit.
(v) Scientifically correct, labelled diagrams should be drawn wherever necessary.
- (A) Choose the correct alternative: 5
(i) Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in
(A) Group 2
(B) Group 16
(C) Period 2
(D) d-block
Answer – (A) Group 2
(ii) The reaction in which ions in the reactants are exchanged to form a precipitate is called as reaction.
(A) Combination
(B) Decomposition
(C) Displacement
(D) Double Displacement
Answer – (D) Double Displacement
… is used to make a solenoid type coil in an electric bulb.
(A) Nichrome
(B) Copper
(C) Tungsten
(D) Aluminium
Answer – (C) Tungsten
(e) Light changes its direction when going from one transparent medium to another transparent medium. This process is called
(A) Reflection
(B) Dispersion
(C) Scattering
(D) Refraction
Answer – (D) Refraction
(v) (CaO+H₂O Ca(OH), Hent is an example of reaction.
(A) Exothermic
(B) Electrolysis
(C) Decomposition
(D) Endothermic
Answer – (A) Exothermic
(B) Answer the following questions: 5
(i) State whether true or false
A redox reaction takes place during cellular respiration:
Answer – True
(ii) Find the odd one out:
Loudspeaker, microphone, electric motor, magnet.
Answer – magnet.
(iii) What is the reason for twinkling of stars?
Answer – Atmospheric Refarction
(iv) Match the columns:
Column ‘A’ Column ‘B’
Simple microscope (a) used to observe minute objects
(b) used to see distant objects
(c) used for watch repair
Answer – (c) used for watch repair
(2) Name the behaviour of water between its temperature from 0°C to 4°C.
Answer – Anomalous behaviour of water
Que 2. (A) Give scientific reasons (any two):
(i) While going from left to right within a period, the size of atom decreases.
Answer – (1) In a period while going from left to right, atomic radius goes on decreasing and the atomic number increases one by one, that means positive charge on the nucleus increases by one unit at a time.
(2) However, the additional electron is added to the same outermost shell. Due to the increased nuclear charge the electrons are pulled towards the nucleus to a greater extent, as a result the size of atom.decreases i.e., atomic radius decreases.
(ii) For electric power transmission, copper or aluminium wire is used.
Answer –
(1) Copper and aluminium are good conductors of electricity.
(2) Copper and aluminium have very low resistivity. Hence, when an electric current flows through a wire of copper or aluminium, heat produced is comparatively low. Therefore, for electric power transmission, copper or aluminium wire is used.
(iii) In some countries, ethanel is used as an additive to increase the efficiency of petrol.
(B) Answer the following (any three): 6
(i) Name and state the principle used to measure the specific heat capacity of a substance.
Answer – Ans. The principle of heat exchange is used to measure the specific heat capacity of a substance. This principle is as follows: If a system of two objects is isolated from the environment by keeping it inside a heat resistant box, then no energy can leave the box or enter the box. In this situation, heat energy lost by the hot object heat energy gained by the cold object,
(ii) What is done to prevent rusting of iron door of your house ?
(iii) Distinguish between mass and weight.
Answer –
Mass
- The mass of a body is the amount of matter present in it.
- It has magnitude, but not direction.
- It does not change from place to place.
- It can never be zero.
- Its SI unit is the kilogram.
Weight
- The weight of a body is the force with which the earth attracts it.
- It has both magnitude and direction.
- It changes from place to place.
- It is zero at the centre of the earth.
- Its SI unit is the newton.
(iv) The ‘rocket’ is a type of fire cracker used in Diwali.
(a) Name the launcher.
(b) Name the law on which its working is based.
Answer –
(v) What is meant by decomposition reaction? Write the chemical reaction of decomposition of sugar on heating.
Answer –
The reaction in which the place of the ion of a less reactive element in a compound is taken by another more reactive element by formation of its own ions, is called displacement reaction.
C12H22O11 Heat 12c + 11 H20
Sugar Carbon Water
Que 3. Answer the following (any five): 15
(i) An iron ball of mass 3 kg is released from a height of 125 m and falls freely to the ground. Assuming that the value of g is 10 m/s², calculate:
(a) Time taken by the ball to reach the ground.
(b) Velocity of the ball on reaching the ground.
(ii) Write the name and symbol of the element from the description:
(a) The most electronegative atom.
Answer – aflorine F
(b) The atom having smallest atomic mass.
Answer – hydrogen H
(c) The noble gas with the smallest atomic radius.
Answer – Helium He
(iii) (a) What happens when copper reacts with concentrated nitric acid ? What is the colour of the gas released during the reaction ?
(b) Write its balanced chemical equation.
(c) Write the names of reactants and products.
(iv) Name the following diagrams and explain the concept behind them:
Answer – a motion of conductor
Answer – b direction of magnetic field
(v) Answer the following with respect to the ‘Formation of Rainbow’:
(a) Draw a neat diagram to show the formation of rainbow.
Answer –
(b) Name any two natural processes involved in formation of rainbow.
Answer – (1) Dispersion (2) Total internal reflection
(c) What does a small droplet of water act as ?
Answer –
(vi) Name the following:
(a) The two metals which can be cut with knife.
Answer – (a) Sodium Na, Potassium K
(b) A sound is produced when certain metals are struck. Name this property of metals.
Answer – Sonorosity
(c) The non-metallic substance which is a good conductor of electricity.
Answer -Grahite
(vii) Answer the following questions with the help of the given diagram:
Answer –
(a) Name the process shown in the diagram.
Answer –
(6) How does this process take place?
Answer –
(c) Give two examples in which this process is used.
Answer –
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