SCERT D. El. Ed 2026 - Environmental Science (EVS)

SCERT D. El. Ed 2026 – Environmental Science

SCERT D. El. Ed 2026 – Environmental Science

Science & EVS – Part 7

Q1. Acids turn blue litmus paper:
  • A. Yellow
  • B. Red
  • C. Green
  • D. Black
Correct Answer: B. Red
Q2. Bases turn red litmus paper:
  • A. Red
  • B. Blue
  • C. Yellow
  • D. White
Correct Answer: B. Blue
Q3. The pH of a neutral solution at 25°C is:
  • A. 0
  • B. 7
  • C. 14
  • D. 10
Correct Answer: B. 7
Q4. Vinegar contains which acid?
  • A. Acetic acid
  • B. Sulphuric acid
  • C. Hydrochloric acid
  • D. Nitric acid
Correct Answer: A. Acetic acid
Q5. The acid present in human gastric juice is:
  • A. Acetic acid
  • B. Hydrochloric acid
  • C. Citric acid
  • D. Lactic acid
Correct Answer: B. Hydrochloric acid
Q6. When an acid reacts with a base, the products are:
  • A. Salt and water
  • B. Hydrogen and oxygen
  • C. Acid and gas
  • D. Two new acids
Correct Answer: A. Salt and water
Q7. Phenolphthalein in a basic solution shows what colour?
  • A. Colourless
  • B. Pink/magenta
  • C. Yellow
  • D. Blue
Correct Answer: B. Pink/magenta
Q8. The chemical formula of common salt is:
  • A. NaCl
  • B. KCl
  • C. CaCl2
  • D. NH4Cl
Correct Answer: A. NaCl
Q9. The chemical name of baking soda is:
  • A. Sodium chloride
  • B. Sodium bicarbonate
  • C. Sodium carbonate
  • D. Calcium carbonate
Correct Answer: B. Sodium bicarbonate
Q10. Slaked lime is chemically:
  • A. CaCO3
  • B. Ca(OH)2
  • C. CaO
  • D. CaCl2
Correct Answer: B. Ca(OH)2
Q11. Antacids relieve indigestion by:
  • A. Increasing stomach acid
  • B. Neutralising excess stomach acid
  • C. Producing oxygen
  • D. Killing bacteria
Correct Answer: B. Neutralising excess stomach acid
Q12. Light travels in a vacuum at approximately:
  • A. 3 * 10^5 m/s
  • B. 3 * 10^8 m/s
  • C. 3 * 10^10 m/s
  • D. 3 * 10^3 m/s
Correct Answer: B. 3 * 10^8 m/s
Q13. Light travels in a homogeneous medium in:
  • A. Curved paths
  • B. Straight lines
  • C. Random directions
  • D. Spirals
Correct Answer: B. Straight lines
Q14. According to the laws of reflection, the angle of incidence equals the:
  • A. Angle of refraction
  • B. Angle of reflection
  • C. Critical angle
  • D. Right angle
Correct Answer: B. Angle of reflection
Q15. Reflection from a smooth surface like a mirror is called:
  • A. Diffuse reflection
  • B. Regular (specular) reflection
  • C. Refraction
  • D. Dispersion
Correct Answer: B. Regular (specular) reflection
Q16. Image formed by a plane mirror is:
  • A. Real and inverted
  • B. Virtual, erect and same size
  • C. Real and magnified
  • D. Virtual and inverted
Correct Answer: B. Virtual, erect and same size
Q17. A convex mirror always forms an image that is:
  • A. Real and magnified
  • B. Real and same size
  • C. Virtual, erect and diminished
  • D. Virtual and magnified
Correct Answer: C. Virtual, erect and diminished
Q18. Concave mirrors are used in:
  • A. Rear-view of cars
  • B. Solar cookers and headlamps
  • C. Wide-angle photography
  • D. Periscopes
Correct Answer: B. Solar cookers and headlamps
Q19. Diffuse reflection occurs on:
  • A. Smooth mirrors
  • B. Polished metals
  • C. Rough or irregular surfaces
  • D. Glass surfaces
Correct Answer: C. Rough or irregular surfaces
Q20. A real image is one that:
  • A. Cannot be seen
  • B. Can be projected onto a screen
  • C. Forms behind the mirror
  • D. Is always erect
Correct Answer: B. Can be projected onto a screen

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