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Andhra Pradesh SSC (Class 10) Science and Technology — practice by topic

Browse 929 questions across 28 Science and Technology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Science and Technology topics

Life Processes in Living Organisms Part 1 (110)Metals and Non-metals (102)Periodic Classification of Elements (98)Carbon Compounds (76)Effects of Electric Current (71)Refraction of Light and Lenses (63)Acids, Bases and Salts (52)Life Processes in Living Organisms Part 2 (48)Chemical Reactions and Equations (43)The Human Eye and the Colourful World (32)Mole Concept and Stoichiometry (30)Refraction through a Lens (30)Cell Biology and Biotechnology (28)Heredity and Evolution (28)Machines (26)Sources of Energy (23)Force (21)Electromagnetism (19)Environmental & Disaster Management (14)C10mirrorformula (5)Physics (2)Refraction of Light at Plane Surfaces (2)Spectrum (2)Biology (1)Calorimetry (1)Current Electricity (1)Magnetism and Matter (1)Sound (1)

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Which equation best represents the essential ionic change in a neutralization reaction?Read the answer and worked solution →Heating copper nitrate crystals produces black copper oxide, reddish-brown nitrogen dioxide, and oxygen. This reaction is best classified asRead the answer and worked solution →Two lenses of power +5 D and −2 D are placed in contact. The focal length of the combination isRead the answer and worked solution →A 10 mm pin in front of a concave mirror forms a real, inverted 5 mm image at 30 cm in front of the mirror. The focal length of the mirror isRead the answer and worked solution →

Worked practice questions

Which equation best represents the essential ionic change in a neutralization reaction?

  1. $\mathrm{Na^+ + Cl^- \rightarrow NaCl}$
  2. $\mathrm{H^+ + OH^- \rightarrow H_2O}$
  3. $\mathrm{Ag^+ + Cl^- \rightarrow AgCl}$
  4. $\mathrm{Mg + O \rightarrow MgO}$
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Correct answer: B. $\mathrm{H^+ + OH^- \rightarrow H_2O}$

Neutralization is fundamentally the reaction between hydrogen ions from an acid and hydroxide ions from a base to form water: $\mathrm{H^+ + OH^- \rightarrow H_2O}$. The other options describe salt formation, precipitation, or oxidation.

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Heating copper nitrate crystals produces black copper oxide, reddish-brown nitrogen dioxide, and oxygen. This reaction is best classified as

  1. combination
  2. displacement
  3. thermal decomposition
  4. neutralization
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Correct answer: C. thermal decomposition

A single compound, copper nitrate, breaks down into simpler substances on heating. Since heat causes the breakdown, it is a thermal decomposition reaction.

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Two lenses of power +5 D and −2 D are placed in contact. The focal length of the combination is

  1. 50 cm
  2. −33.3 cm
  3. 33.3 cm
  4. 20 cm
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Correct answer: C. 33.3 cm

Powers add in contact: $P=+5-2=+3$ D. $f=1/P=1/3\,\text{m}=33.3$ cm (converging).

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