MOST IMPORTANT MCQS FOR SCIENCE
CBSE Class 10th Science Exam 2024 : Top 50+ MCQs with Answers for Last Minute Revision
CBSE Class 10 Science Top 50 MCQs with Answers
Q1. Which option correctly shows the transport of oxygen to the cell ?
(a) Lungs →pulmonary artery →right atrium → right ventricle→ vena cava → body cells
(b) Lungs →pulmonary vein →right atrium →right ventricle → aorta → body cells
(c) Lungs →pulmonary artery →left atrium → left ventricle → vena cava → body cells
(d) Lungs →pulmonary vein →left atrium →left ventricle →aorta → body cells
Ans. (d) Lungs →pulmonary vein →left atrium →left ventricle →aorta → body cells
Q2. What type of chemical reactions take place when electricity is passed through water ?
(a) Decomposition
(b) Combination
(c) Displacement
(d) Double displacement
Ans. (a) Decomposition
Q3. Posture and balance of the body is controlled by :
(a) Cerebellum
(b) Medulla oblongata
(c) Pons
(d) Cerebrum
Ans. (a) Cerebellum
Q4. Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:
(a) Make the ribbon surface shinier
(b) Remove the layer of magnesium oxide from the ribbon surface
(c) Remove the dust from the ribbon surface
(d) Remove the moisture from the ribbon surface.
Ans. (b) Remove the layer of magnesium oxide from the ribbon surface
Q5. Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved ?
(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction
(a) (i) only
(b) (ii) only
(c) (iv) only
(d) (ii) and (iv)
Ans. (d) (ii) and (iv)
Q6. A milkman adds a very small amount of baking soda to fresh milk. Why ?
(a) To increase the rate of fermentation.
(b) To decrease the rate of fermentation.
(c) To improve its quality.
(d) To make paneer.
Ans. (b) To decrease the rate of fermentation.
Q7. What is the nature of nutrition in fungi ?
(a) Saprotrophs
(b) Parasite
(c) Mixed autotrophs
(d) Autotrophs
Ans. (a) Saprotrophs
Q8. Which conducting tissue is responsible for multidirectional transport in plants ?
(a) Guard Cell
(b) Xylem
(c) Phloem
(d) Parenchyma
And. (c) Phloem
Q9. What is the normal systolic and diastolic pressure in humans -
(a) 80 mm Hg/ 120 mm Hg
(b) 80 mm Hg/ 80 mm Hg
(c) 120 mm Hg/ 120 mm Hg
(d) 120 mm Hg / 80 mm Hg
Ans: (d) 120 mm Hg / 80 mm Hg
Q10. Which of the following non-metal is liquid at room temperature ?
(a) Phosphorous
(b) Bromine
(c) Mercury
(d) Carbon
Ans. (b) Bromine
Q11. What is the main function of the cerebrum ?
(a) Thinking
(b) Hearing
(c) Memory
(d) Balancing
Ans. (a) Thinking
Q12. The highest coordinating center in the human body is :
(a) Kidney
(b) Heart
(c) Brain
(d) Spinal cord
Ans. (c) Brain
Q13. The longest fiber on the cell body of a neuron is called :
(a) Axon
(b) Sheath
(c) Cytoplasm
(d) Dendrites
Ans. (a) Axon
Q14. Which of the following diseases is not sexually transmitted ?
(a) Syphilis
(b) Gonorrhea
(c) HIV-AIDS
(d) Hepatitis
Ans. (d) Hepatitis
Q15. The blue appearance of the sky is due to :
(a) Atmospheric refraction
(b) Scattering of light
(c) Presence of plants in water
(d) None of these
Ans. (b) Scattering of light
Q16. The phenomenon of light scattering by colloidal particles is known as :
(a) Dispersion
(b) Tyndall effect
(c) Atmospheric refraction
(d) Internal reflection
Ans. (b) Tyndall effect
Q17. Sunlight is passed through a transparent medium having very fine particles These particles scatter light. Which among the given components of light undergoes more scattering ?
(a) Yellow
(b) Blue
(c) Red
(d) Orange
Ans. (b) Blue
Q18. Which of the following is a biodegradable waste ?
(a) Aluminum can
(b) DDT
(c) Plastic bag
(d) Cow dung
Ans. (d) Cow dung
Q19. The process in which non-biodegradable pesticides accumulate in increasing amounts at each higher trophic level within the food chain is referred to as :
(a) Biomagnification
(b) Eutrophication
(c) Pollution
(d) Accumulation
Ans. (a) Biomagnification
Q20. What term is used to refer to the genetic makeup of an individual organism ?
(a) Allele
(b) Homozygous
(c) Genotype
(d) Phenotype
Ans. (c) Genotype
Q21. What should be the core of an electromagnet ?
(a) Hard iron
(b) Soft iron
(c) Rusted iron
(d) None of above
Ans.(b) Soft iron
Q22. In which medium does light have the maximum velocity ?
(a) Glass
(b) Diamond
(c) Vacuum
(d) Water
Ans. (c) Vacuum
Q23. In human females, an event that indicates the onset of reproductive phase is :
(a) Growth of the body
(b) Menstruation
(c) Change in voice
(d) None of the above
Ans. (b) Menstruation
Q24. The device used for producing electric current is called a :
(a) Motor.
(b) Galvanometer.
(c) Ammeter.
(a) Generator.
Ans. (d) Generator.
Q25. The direction of force on a current carrying conductor in a magnetic field is given by:
(a) Left hand thumb rule.
(b) Fleming’s right-hand rule.
(c) Right hand thumb rule.
(d) Fleming’s left-hand rule.
Ans. (d) Fleming’s left-hand rule.
Q26. What is the nature of nutrition in fungi ?
(a) Saprotrophs
(b) Parasite
(c) Mixed autotrophs
(d) Autotrophs
Ans. (a) Saprotrophs
Q27. A plant gets rid of excess water through transpiration. Which is a method used by plants to get rid of solid waste products ?
(a) Shortening of stem
(b) Shedding of yellow leaves
(c) Dropping down of fruits
(d) Expansion of roots into the soil
Ans. (b) Shedding of yellow leaves
Q28. Which plant hormone promotes cell division ?
(a) Auxin
(b) Cytokinin
(c) Abscisic Acid
(d) Gibberellin
Ans. (b) Cytokinin
Q29. The longest fiber on the cell body of a neuron is called :
(a) Axon
(b) Sheath
(c) Cytoplasm
(d) Dendrites
Ans. (a) Axon
Q30. The highest co-ordinating center in the human body is :
(a) Kidney
(b) Heart
(c) Brain
(d) Spinal cord
Ans. (c) Brain
Q31. Which of the following acts as both endocrine and exocrine gland ?
(a) Adrenal
(b) Thyroid
(c) Liver
(d) Pancreas
Ans. (d) Pancreas
Q32. The part of a seed which grows and develops into root on germination is :
(a) Cotyledon
(b) Radicle
(c) Follicle
(d) Plumule
Ans. (b) Radicle
Q33. Posture and balance of the body is controlled by :
(a) Cerebellum
(b) Medulla oblongata
(c) Pons
(d) Cerebrum
Ans. (a) Cerebellum
Q34. Which of the following diseases is not sexually transmitted ?
(a) Syphilis
(b) Gonorrhea
(c) HIV-AIDS
(d) Hepatitis
Ans. (d) Hepatitis
Q35. The device used for producing electric current is called a :
(a) Motor.
(b) Galvanometer.
(c) Ammeter.
(d) Generator.
Ans. (d) Generator.
Q36. In human females, an event that indicates the onset of reproductive phase is :
(a) Growth of the body
(b) Menstruation
(c) Change in voice
(d) None of the above
Ans. (b) Menstruation
Q37. The direction of force on a current carrying conductor in a magnetic field is given by :
(a) Left hand thumb rule.
(b) Fleming’s right-hand rule.
(c) Right hand thumb rule.
(d) Fleming’s left-hand rule.
Ans. (d) Fleming’s left-hand rule.
Q38. What should be the core of an electromagnet ?
(a) Hard iron
(b) Soft iron
(c) Rusted iron
(d) None of above
Ans.(b) Soft iron
Q39. Which part of the DNA provides information for a protein ?
(a) Gene
(b) Mitochondria
(c) RNA
(d) Chromosome
Ans. (a) Gene
Q40. What term is used to refer to the genetic makeup of an individual organism ?
(a) Allele
(b) Homozygous
(c) Genotype
(d) Phenotype
Ans. (c) Genotype
Q41. Regardless of your distance from a mirror, the reflected image appears upright. The mirror is most likely to be :
(a) Plane
(b) Concave
(c) Convex
(d) Either plane or convex
Ans. (b) Concave
Q42. In which medium does light have the maximum velocity ?
(a) Glass
(b) Diamond
(c) Vacuum
(d) Water
Ans. (c) Vacuum
Q43. If a normal human body cell has 46 pairs of chromosomes, what is the probable number of chromosomes in a human sex cell ?
(a) 22
(b) 23
(c) 60
(d) 40
Ans. (b) 23
Q44. The blue appearance of the sky is due to :
(a) Atmospheric refraction
(b) Scattering of light
(c) Presence of plants in water
(d) None of these
Ans. (b) Scattering of light
Q45. The phenomenon of light scattering by colloidal particles is known as :
(a) Dispersion
(b) Tyndall effect
(c) Atmospheric refraction
(d) Internal reflection
Ans. (b) Tyndall effect
Q46. When electric current is passed, electrons move from :
(a) High potential to low potential.
(b) Low potential to high potential.
(c) In the direction of the current.
(d) Against the direction of the current.
Ans. (c) In the direction of the current.
Q47. The electrical resistivity of a given metallic wire depends on :
(a) Its shape
(b) Its thickness
(c) The nature of the material
(d) Its length
Ans. (c) The nature of the material
Q48. Sunlight is passed through a transparent medium having very fine particles, These particles scatter light. Which among the given components of light under goes more scattering ?
(a) Yellow
(b) Blue
(c) Red
(d) Orange
Ans. (b) Blue
Q49. Which of the following is a biodegradable waste ?
(a) Aluminum can
(b) DDT
(c) Plastic bag
(d) Cow dung
Ans. (d) Cow dung
Q50. The process in which non-biodegradable pesticides accumulate in increasing amounts at each higher trophic level within the food chain is referred to as :
(a) Biomagnification
(b) Eutrophication
(c) Pollution
(d) Accumulation
Ans. (a) Biomagnification
Comments
Post a Comment