Secondary School Science Exam 2025

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Questions and Answers

What is formed when an obstacle is placed in front of a light source?

  • Penumbra
  • None of these
  • Both Shadow and Penumbra
  • Shadow (correct)

What is the focal length of a plane mirror?

  • 50 cm
  • Zero
  • 100 cm
  • Infinity (correct)

What is the power of a convex lens with a focal length of 1 meter?

  • 2 D
  • -1 D
  • 1 D (correct)
  • 1.5 D

Which type of lens is also known as a diverging lens?

<p>Concave lens (B)</p> Signup and view all the answers

What is true about the speed of light in different media?

<p>Different (B)</p> Signup and view all the answers

What is the SI unit of magnification produced by a lens?

<p>Unitless (C)</p> Signup and view all the answers

Which of the following materials has the highest refractive index?

<p>Diamond (C)</p> Signup and view all the answers

What type of image does a converging lens form?

<p>A real or a virtual image (C)</p> Signup and view all the answers

Which phenomenon is responsible for the blue color of the sky?

<p>Scattering (C)</p> Signup and view all the answers

Which of the following is a primary color of light?

<p>All of these (C)</p> Signup and view all the answers

Where are large numbers of light-sensitive cells present in the eye?

<p>In Retina (C)</p> Signup and view all the answers

Which type of lens is used for the treatment of farsightedness?

<p>Convex lens (C)</p> Signup and view all the answers

What is the persistence of vision for the human eye?

<p>1/16 sec (D)</p> Signup and view all the answers

Which of the following units is equal to watt(W)?

<p>J/sec (D)</p> Signup and view all the answers

What is 1 kilowatt-hour equal to?

<p>1 unit (A)</p> Signup and view all the answers

What is the SI unit of electric power?

<p>Watt (B)</p> Signup and view all the answers

What is 1 kWh equal to?

<p>3.6 × 10^6 J (A)</p> Signup and view all the answers

Who propounded the 'right hand thumb' rule?

<p>Maxwell (A)</p> Signup and view all the answers

On which principle of electric current does an electric fuse work?

<p>Thermal (D)</p> Signup and view all the answers

To increase the value of resistance, how should resistors be connected?

<p>Series (C)</p> Signup and view all the answers

Which material is typically used for making the coil of an electric heater?

<p>Nichrome (A)</p> Signup and view all the answers

Which of the following is responsible for global warming?

<p>CO2 (C)</p> Signup and view all the answers

Which among the following is a fossil fuel?

<p>All of the above (B)</p> Signup and view all the answers

What is the source of the huge energy emitted by the sun and other stars?

<p>Nuclear fusion (A)</p> Signup and view all the answers

What was the purpose of construction of the Tehri Dam?

<p>All of these (C)</p> Signup and view all the answers

Which cell is commonly used in toys?

<p>Dry cell (C)</p> Signup and view all the answers

Which gas is liberated at the cathode during electrolysis in water?

<p>Hydrogen (A)</p> Signup and view all the answers

In the reaction ZnO + C -> Zn + CO, which statement is true?

<p>Carbon is being oxidizing (C)</p> Signup and view all the answers

Which gas is formed as a result of the reaction of Zinc and dilute hydrochloric acid?

<p>H2 (C)</p> Signup and view all the answers

Which of the following gases turns lime water milky?

<p>CO2 (A)</p> Signup and view all the answers

Which among the following is slaked lime?

<p>Ca(OH)2 (A)</p> Signup and view all the answers

Toothpaste is generally what?

<p>Alkaline (A)</p> Signup and view all the answers

Which acid is present in lemon?

<p>Citric acid (B)</p> Signup and view all the answers

What is the pH value of milk of magnesia?

<p>10.5 (A)</p> Signup and view all the answers

Flashcards

What is a concave lens?

A diverging lens, which causes light rays to spread out.

What is Refraction?

The bending of light as it passes through different mediums.

Which has the highest refractive index?

Diamond has the highest refractive index.

Why is the sky blue?

Scattering of sunlight by particles in the atmosphere.

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What are the primary colors of light?

Red, blue, and green

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Where are light-sensitive cells located?

In the retina, where light-sensitive cells are concentrated.

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Which lens is used for farsightedness?

Convex lens

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What is Watt (W) equal to?

Joule per second (J/sec)

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What is 1 kWh equal to?

3.6 x 10^6 Joules

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On what principle does an electric fuse work?

Thermal (heating effect)

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How to increase resistance?

Connecting resistors in series.

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What material is used in electric heater coils?

Nichrome

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Which gas causes global warming?

CO2 (Carbon Dioxide)

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What are fossil fuels?

Petroleum, natural gas and coal

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How do suns make energy?

Nuclear fusion

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Which gas is released at the cathode during electrolysis?

Hydrogen

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What is being Oxidized?

Carbon

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What gas forms from zinc and hydrochloric acid?

Hydrogen gas (H2)

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Which turns lime water milky?

CO2 (carbon dioxide)

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What color does the CO2 turn lime water?

Milky, white or translucent

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What is slaked lime?

Ca(OH)2

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Which acid is in lemon?

Citric acid

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What is the pH of milk of magnesia?

8

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What do acids and bases do?

React with each other

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What is an ore of Zinc?

Zinc blende

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Metal which dissolves in aqua regia.

Gold

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Non-ionic compound?

CO2

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State property of Helium gas is?

Inert

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Which is hardest natural substance?

Diamond

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Benzene molecular formula.

C6H6

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Bond btw Hydrogen atom?

Single bond

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Limewater chemical name?

Calcium hydroxide

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Mendeleev criteria for preparing table?

Atomic Number

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Which isn't the alkali family?

Not in Alkali family?

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Member of halogen family?

Bromine

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Study Notes

  • This is a Secondary School Examination-2025 for Science (Compulsory).
  • The total number of questions are 110.
  • The exam is for 2 hours and 45 minutes.
  • The full marks are 80.
  • Candidates must enter their Question Booklet Serial No. (10 Digits) on the OMR Answer Sheet.
  • Candidates should answer in their own words if possible.
  • Figures on the right-hand margin indicate full marks.
  • Candidates have 15 minutes extra to read the questions carefully.
  • The question booklet is divided into SECTION-A and SECTION-B.

SECTION-A : Objective Type Questions

  • SECTION-A includes 80 objective type questions and candidates have to answer any 40 questions.
  • Each question carries one mark.
  • First 40 answers will be evaluated if more than 40 questions answered by any candidate.
  • Use a blue/black ball pen to darken the correct option on the OMR Answer Sheet.
  • Do not use whitener/liquid/blade/nail etc. on the OMR Answer sheet; otherwise, the result will be treated invalid.

SECTION-B : Short Answer Type Questions

  • SECTION-B includes 24 short answer type questions.
  • 8 questions are from Physics, 8 from Chemistry, and 8 from Biology.
  • Four questions are to be answered from each subject i.e. Physics, Chemistry and Biology.
  • Each question carries 2 marks.
  • There are 6 Long Answer type questions, two questions each from Physics, Chemistry and Biology.
  • Physics Long Answer Type questions carry 6 marks each.
  • Chemistry and Biology carry 5 marks each.
  • Answer of one question each from Physics, Chemistry and Biology is compulsory.
  • Use of any electronic appliances is strictly prohibited.

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