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1. Which of the following reactions is a redox reaction?
2. The reaction: 2FeSO₄ → Fe₂O₃ + SO₂ + SO₃ is an example of:
3. In a displacement reaction, zinc granules are placed in copper sulphate solution. Which observation is correct?
4. Which of the following represents a balanced chemical equation?
5. The brown coating on iron articles exposed to moist air is:
6. Reaction between an acid and a base is called:
7. Which of the following shows endothermic reaction?
8. Which organ in humans is responsible for double circulation?
9. Which enzyme in saliva helps in digestion?
10. In plants, stomata help in:
11. Which part of nephron is responsible for filtration?
12. Which structure prevents backflow of blood in heart?
13. Anaerobic respiration in muscles produces:
14. In human digestive system, bile is produced by:
15. Photosynthesis requires:
16. The focal length of a concave mirror is 15 cm. Where should an object be placed to get an image of same size?
17. The mirror used as rear-view mirror in vehicles is:
18. Which lens is used by a short-sighted person?
19. The speed of light is maximum in:
20. The power of a lens is +2D. Its focal length is:
21. A ray passing through optical centre of a convex lens:
22. Which of the following is used to correct hypermetropia?
23. The refractive index of water is 1.33. This means:
24. In which mirror is the image always virtual and diminished?
25. A lens with focal length 20 cm has power: