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BSEB Class 10 Science: Objective Questions (MCQ) Bihar Board · NCERT · CBSE
Objective questions (MCQ) for every Bihar Board Class 10 Science chapter, with the correct answer and explanation. Try the 10 sample questions below, then open a chapter for its full set.
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Chapter-wise questions More chapters are added here as soon as they go live.
10 sample MCQs (tap to see the answer) 1 Ch 1 NCERT exercise · Exercise 1
Which of the statements about the reaction below are incorrect ?
2PbO(s) + C(s) → 2Pb(s) + CO2 (g)
(a) Lead is getting reduced. (b) Carbon dioxide is getting oxidised. (c) Carbon is getting oxidised. (d) Lead oxide is getting reduced.
(A) (a) and (b)(B) (a) and (c)(C) (a), (b) and (c)(D) allShow answer Hide answer Correct answer: (A) (a) and (b)
PbO loses O → PbO is reduced (d is true); C gains O → C is oxidised (c is true). (a) and (b) are incorrect → answer (i).
2 Ch 1 NCERT exercise · Exercise 2
Fe2 O3 + 2Al → Al2 O3 + 2Fe — the above reaction is an example of a —
(A) Combination reaction(B) Double displacement reaction(C) Decomposition reaction(D) Displacement reactionShow answer Hide answer Correct answer: (D) Displacement reaction
The more reactive Al displaces Fe from Fe₂O₃ = displacement (d).
3 Ch 1 NCERT exercise · Exercise 3
What happens when dilute hydrochloric acid is added to iron filings? Choose the correct answer.
(A) Hydrogen gas and iron chloride are produced.(B) Chlorine gas and iron hydroxide are produced.(C) No reaction takes place.(D) Iron salt and water are produced.Show answer Hide answer Correct answer: (A) Hydrogen gas and iron chloride are produced.
Fe(s) + 2HCl(aq) → FeCl2 (aq) + H2 (g) — metal + dilute acid → salt + H₂.
4 Ch 1 BSEB model paper 2026 (not the annual exam) · Q28 · page 11 1 mark
Which of the following pairs represents single displacement reaction?
(A) NaCl(B) MgCl2 (C) FeSO4 (D) AgNO3 Show answer Hide answer Correct answer: (D) AgNO3
Copper is more reactive than silver, so it removes silver from AgNO3 :
Cu(s) + 2AgNO3 (aq) → Cu(NO3 )2 (aq) + 2Ag(s)
In (A) and (B) copper is less reactive than Na and Mg; in (C) silver is less reactive than iron — so no reaction takes place there.
5 Ch 2 Check
Which is the right remedy for acidity after overeating?
(A) A solution of baking soda(B) Vinegar(C) Lemon juice(D) Lemon pickleShow answer Hide answer Correct answer: (A) A solution of baking soda
Baking soda is a base — it neutralises the extra acid. The other three contain acids, so they would increase the acidity.
6 Ch 2 Check
A curry stain on a white cloth turns reddish-brown when soap is scrubbed on it. What does this show?
(A) Soap is acidic(B) Turmeric is an indicator and soap is basic(C) The cloth is a base(D) The curry contains a baseShow answer Hide answer Correct answer: (B) Turmeric is an indicator and soap is basic
Curry contains turmeric, which turns from yellow to reddish-brown in a base. Soap is basic, so the stain changed colour.
7 Ch 2 Check
What colour does phenolphthalein give in a base?
(A) Red(B) Colourless(C) Pink(D) YellowShow answer Hide answer Correct answer: (C) Pink
Phenolphthalein turns pink in a base and stays colourless in an acid.
8 Ch 3 Check
What is the shining surface of a pure metal called?
(A) Malleability(B) Metallic lustre(C) Ductility(D) SonorityShow answer Hide answer Correct answer: (B) Metallic lustre
The shining surface of a pure metal is called metallic lustre.
9 Ch 3 Check
Sodium metal is kept under which liquid?
(A) Water(B) Alcohol(C) Kerosene(D) Dilute HClShow answer Hide answer Correct answer: (C) Kerosene
Kerosene keeps sodium out of contact with air and water.
10 Ch 3 Check
Beating a metal into a thin sheet is called what?
(A) Ductility(B) Malleability(C) Sonority(D) ConductivityShow answer Hide answer Correct answer: (B) Malleability
Beating into a sheet is malleability. Drawing a wire is ductility.
