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MCQ Practice

General Science (Everyday Science) MCQs

Which blood type is universal donor?

  • A. A
  • B. B
  • C. AB
  • D. O
Explanation:
O lacks A/B antigens.

Which organelle has its own DNA?

  • A. Nucleus
  • B. Mitochondria
  • C. Ribosome
  • D. Golgi
Explanation:
Mitochondria contain circular DNA.

Which phase produces ATP most?

  • A. Glycolysis
  • B. Krebs cycle
  • C. Electron transport chain
  • D. Fermentation
Explanation:
Oxidative phosphorylation yields most ATP.

Which molecule carries amino acids?

  • A. mRNA
  • B. rRNA
  • C. tRNA
  • D. DNA
Explanation:
tRNA transports amino acids.

Which enzyme catalyzes RNA synthesis?

  • A. DNA polymerase
  • B. RNA polymerase
  • C. Ligase
  • D. Helicase
Explanation:
RNA polymerase transcribes DNA.

Which hybridization is linear?

  • A. sp
  • B. sp²
  • C. sp³
  • D. dsp²
Explanation:
sp gives 180° geometry.

Which species is strongest nucleophile?

  • A. H₂O
  • B. NH₃
  • C. OH⁻
  • D. Cl⁻
Explanation:
OH⁻ has high electron density.

Which compound is most soluble in water?

  • A. Benzene
  • B. NaCl
  • C. CH₄
  • D. CCl₄
Explanation:
Ionic compounds dissolve well.

Which molecule has highest dipole moment?

  • A. CO₂
  • B. NH₃
  • C. CH₄
  • D. BF₃
Explanation:
NH₃ is polar with lone pair.

Which interaction binds quarks together?

  • A. Electromagnetic
  • B. Weak
  • C. Strong
  • D. Gravitational
Explanation:
Strong force confines quarks.