Browse MCQs

Practice multiple choice questions and check your answers instantly. Learn at your own pace.

Practice Now
Test yourself with instant feedback
Showing 1,525 MCQs
Biology
A. Cerebrum
B. Cerebellum
C. Hypothalamus
D. Thalamus
Answer: The hypothalamus acts as the body\'s thermostat, regulating temperature and homeostasis.
Chemistry
A. Neutron
B. Proton
C. Electron
D. Alpha particle
Answer: A neutron is a neutral subatomic particle found in the nucleus with no electric charge.
Chemistry
A. sp3
B. sp
C. sp2
D. sp3d
Answer: Carbon in methane forms four equivalent sigma bonds using sp3 hybridization.
Biology
A. Predation
B. Parasitism
C. Competition
D. Commensalism
Answer: Commensalism is a symbiotic relationship where one organism benefits and the other is unaffected.
Chemistry
A. Aluminium
B. Iron
C. Copper
D. Zinc
Answer: Aluminium is extracted from molten alumina by electrolysis in the Hall-Heroult process.
Chemistry
A. Hydrogen
B. Oxygen
C. Chlorine
D. Carbon dioxide
Answer: Zinc displaces hydrogen from HCl, producing zinc chloride and hydrogen gas.
Chemistry
A. Ionic bond
B. Covalent bond
C. Metallic bond
D. Hydrogen bond
Answer: NaCl is formed by the transfer of an electron from Na to Cl, creating an ionic bond.
Chemistry
A. Starch
B. Glucose
C. Fructose
D. Sucrose
Answer: Starch is a polysaccharide composed of long chains of glucose units linked by glycosidic bonds.
Chemistry
A. Dissolution of ammonium nitrate in water
B. Burning of natural gas
C. Neutralization of acid and base
D. Condensation of steam
Answer: Dissolving ammonium nitrate in water absorbs heat from surroundings, making it endothermic.
Biology
A. NADH
B. FADH2
C. ATP
D. Glucose
Answer: Mitochondria produce ATP through cellular respiration, the cell\'s main energy currency.
Chemistry
A. Red
B. Blue
C. Green
D. Yellow
Answer: Litmus paper turns red in acidic solutions due to the presence of excess H+ ions.
Chemistry
A. Law of conservation of mass
B. Law of definite proportions
C. Law of multiple proportions
D. Gay-Lussac\'s law
Answer: The law of conservation of mass states that total mass remains constant during a chemical reaction.
Chemistry
A. 6.022 x 10^23 particles per mole
B. 6.022 x 10^22 particles per mole
C. 3.011 x 10^23 particles per mole
D. 1.602 x 10^-19 C
Answer: Avogadro\'s number is 6.022 x 10^23, representing the number of particles in one mole.
Chemistry
A. CH2O
B. C2H4O2
C. C3H6O3
D. C6H12O6
Answer: Dividing all subscripts in C6H12O6 by the greatest common divisor 6 gives CH2O.
Biology
A. Ethanol
B. Lactic acid
C. Acetic acid
D. Citric acid
Answer: During anaerobic respiration, pyruvate is converted to lactic acid in muscle cells.
Biology
A. C6H12O6
B. C12H22O11
C. C2H5OH
D. CH3COOH
Answer: Glucose is a hexose sugar with the molecular formula C6H12O6.
Chemistry
A. Al2O3
B. Na2O
C. SO3
D. CaO
Answer: Al2O3 reacts with both acids and bases, which is the defining property of an amphoteric oxide.
Chemistry
A. Fluorine
B. Sodium
C. Silicon
D. Sulfur
Answer: Fluorine is the most electronegative element on the Pauling scale with a value of 3.98.
Chemistry
A. 4
B. 6
C. 8
D. 12
Answer: Carbon has atomic number 6, meaning it has 6 protons in its nucleus.
Chemistry
A. -CHO
B. -OH
C. -COOH
D. -CO-
Answer: Aldehydes contain the -CHO (formyl) functional group bonded to at least one hydrogen.
4 5 6 7 8