Class 10 Science - Question Bank - Very Short Answers Based Questions (Unsolved)(#class10Science)(#cbse2020)(#eduvictors)

Class 10 - SCIENCE - Question Bank - Very Short Answers Based Questions (Unsolved)

1. Why does not a wall immediately acquire a white colour when a coating of slaked lime is applied on it ?

2. Define displacement reaction with one example.

3. Identify the most reactive and least reactive metal : Al, K, Ca, Au.

4. Which of the following is a combination reaction and which is a displacement reaction ?

(a) Cl₂ + 2KI ——–> 2KCl + I₂

(b) 2K + Cl₂ ——–> 2KCl.

5. What is the difference between the following two reactions ?

(a) Mg + 2HCl ——–> MgCl2 + H2

(b) NaOH + HCl ——–> NaCl + H2O.

6. Identify the compound which is oxidised in the following reaction

H₂S + Br₂ ———–> 2HBr + S.

7. What happens chemically when quick lime is added to water ?

8. Give an example of exothermic reaction.

9. Give an example of endothermic reaction.

10. Name the gas that can be used for the storage of fresh sample of chips for a long time.

11. Name the type of reaction

N₂(g) + 3H₂(g) ———-> 2NH₃(g)

12. Give an example of a double displacement reaction (only reaction with complete balanced equation).

13. Why are decomposition reactions called the opposite of combination reactions ?

Write equations for these reactions.

14. In the reaction MnO2 + 4HCl —————> MnCl2 + 2H2O + Cl2; identify which one is reduced and which one is oxidized ?.

15. Take a small amount of calcium oxide or quick lime in a beaker and slowly add water to this. Is there any change in temperature ?

16. Name two salts that are used in black and white photography..

17. State the chemical change that takes place when lime stone is heated

18. What type of lens is used to correct (a) Hypermetropia, (b) Myopia ?

19. Name the defect of vision in which the eye-lens loses its power of accommodation due to old age.

20. What is the far point of a person suffering from myopia?

21. What is the other name of old age hypermetropia?

22. You friend can read a book perfectly well but cannot read the writing on black-board unless she sits on the front row in class. Is she short-sighted or

long-sighted?

23.Which of the two is scattered more easily – light of shorter wavelength or light of longer wavelength ?

24. What is the near and far point of a normal eye?

25. State two effects produced by the scattering of light by the atmosphere.

26. What is tyndall effect?

27. Which light has longer wavelength – red light or blue light ?

28. What do you understand by dispersion of light ?

29. As light rays pass from air into a glass prism, are they refracted towards or away from the normal ?

30.Define S.I. unit of :

(a) Electric current

(b) Potential difference

(c) Resistance

(d) Electric power

(e) Electrical energy consumed

31. Define the term resistivity.

32. Device used for measuring the current is……………. ...

33. Name the element of filament of a bulb.

34. Write two types of resistors combination.

35.Define magnetic field lines.

36. What is the frequency of a.c. in India ?

37. Who discovered the electromagnetic induction ?

38. What is short circuit ?

39. Why does two magnetic field lines not intersect ?

40.Fill in the blanks:

(i) Image formed by a plane mirror is always ........... and ........... .

(ii) A spherical mirror, whose reflecting surface is curved inwards, that is, faces towards the centre of the sphere, is called a ........... .

(iii) The focal length of a spherical mirror is equal to ........... its radius of curvature.

(iv) Speed of light is ........... .

(v) Light rays always travels in ........... .

41. Answer in one word/one sentence.

(i) A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?

(ii) The magnification produced by a plane mirror is +1. What does this mean?

(iii) An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.

(iv) Define the principal focus of a concave mirror.

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