Science, Class 10, Important Questions, Multiple Choice Type

MCQ

                                                                                                                                                50 * 1 = 50

 1. When the gases sulphur dioxide and hydrogen sulphide mix in the presence of water, the reaction

SO₂ + 2H₂S → 2H₂O + 3S occurs. Here, hydrogen sulphide is acting as

(a) an oxidising agent

(b) a reducing agent

(c) a dehydrating agent

(d) a catalyst

  

2. Food cans are coated with tin and not zinc because : 

(a) zinc is costlier than tin.

(b) zinc has a higher melting point than tin.

(c) zinc is more reactive than tin.

(d) zinc is less reactive than tin.

 3. Aluminium is used in thermite welding be­cause

(a) aluminium is a light metal

(b) aluminium has more affinity for oxygen

(c) aluminium is a strong oxidising agent

(d) aluminium is a reactive metal

 4. Which of the following constitutes a food chain?

(a) Grass, Wheat and Mango

(b) Grass, Goat and Human

(c) Goat, Cow and Elephant

(d) Grass, Fish and Goat

 5. In the following equations

Na₂CO₃ + xHCl → 2NaCl + CO₂ + H₂O the value of x is

(a) 1

(b) 2

(c) 3

(d) 4

 6. The anther contains:

(a) sepals

(b) ovules

(c) carpel

(d) pollen grains

 7. The oceans cover almost______ percent of the surface of earth with water and act as a vast collector of______energy.

(a) 71, chemical     

(b) 97, solar

(c) 71, solar

(d) 17, hydro energy

 8. The split rings in motion are called

(a) armature

(b) commutator

(c) rotor

(d) core

  

9. Magnetic lines of force

(a) are mere directions

(b) have no physical reality

(c) can be used to indicate the direction of the magnetic field of a point

(d) all the above are correct

  

10. Which of the following hydroxides is most basic?

(a) Be(OH)₂

(b) Ba(OH)₂

(c) Ca(OH)₂

(d) Mg(OH)₂

 11. The anther contains:

(a) sepals

(b) ovules

(c) carpel

(d) pollen grains

  

12. Gastric glands are present in the wall of:

(a) oesophagus

(b) stomach

(c) small intestine 

(d) large intestine.

  

13. The substance which, on treating with chlo­rine, yields bleaching powder is

(a) quick lime

(b) slaked lime

(c) limestone

(d) gypsum

  

14. A solution reacts with crushed egg-shells to give a gas that turns lime-water milky.

The solution contains:

(a) NaCl

(b) HCl

(c) LiCl

(d) KCI

 15. In India, uranium is found in

(a) U.P.

(b) M.P.

(c) Bihar

(d) Orissa

  

16. A small portion of oviduct is removed in:

(a) Vasectomy

(b) Tubectomy

(c) IUCD

(d) Barrier method

  

17. The coil of a heater is cut into two equal halves and only one of them is used in the heater. The ratio of the heat produced by this half of the coil to that produced by the original coil is

(a) 2 : 1

(b) 4 : 1

(c) l:2

(d) 1:4

  

18. The female hormone secreted from ovary is:

(a) estrogen

(b) FSH

(c) LH

(d) all of these

 19. Which of the following is not a balanced equation?

(a) Ca(HO)₂ + CO₂ → CaCO₃ + H₂O

(b) Fe + CuSO₄ → FeSO₄ + Cu

(c)

(d) Cu + 2HNO₃ →Cu(NO₃)₂ + 2NO₂ + H₂O

 20. The frequency of AC used in India is

(a) 50 Hz

(b) 100 Hz

(c) 200 Hz

(d) none of these

  

21. Which of the following is the correct order of ralative size?

(a) I^->I⁺>I   

(b) I^->I>I⁺    

(c) I>I⁺>I^-      

(d) I⁺>I^->I

22. The acid having a  highest  H⁺ ion concentration is one with

(a) pH = 7.0

(b) pH = 1.2

(c) pH = 2.3

(d) pH = 8.2

 23. Which of the following reactions will not take place?

(a) Zn + FeSO₄ → ZnSO₄ + Fe

(b) 2KI + Cl₂ → 2KCI +I₂

(c) Zn + MgSO₄ → ZnSO₄ + Mg

(d) Mg + CuSO₄ → MgSO₄ + Cu

  

24. 10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HC1. If we take 20 mL of the same solution of NaOH, the amount of HC1 solution (the same solution as before) required to neutralise it will be

(a) 4mL

(b) 8 mL

(c) 12 mL

(d) 16 mL

  

25. The intensity of a magnetic field is defined as the force experienced by a

(a) standard compass

(b) unit negative charge

(c) unit positive charge

(d) unit north pole.

  

26. A solar water heater cannot be used to get hot water on :

(a) a sunny day

(b) a cloudy day

(c) a hot day

(d) a windy day

  

27. About one-third of the energy that we receive from the sun consists of

(a) infra-red rays    

(b) visible light

(c) ultra-violet rays 

(d) all the above

  

28. The human species has genetic roots in

(a) America 

(b) Africa

(c) Australia

(d) Antarctica

  

29. The unit of magnetic flux is

(a) Weber

(b) Gauss

(c) Tesla

(d) Weber/m²

 30. The element with the largest size in the second period is

(a) lithium

(b) fluorine

(c) sodium

(d) oxygen

  

31. The highest boiling point is of

(a) ethane

(b) ethanol

(c) ethanol

(d) ethanoic acid

  

32. In evolutionary terms, we have more in common with :

(a) a Chinese school boy

(b) a chimpanzee

(c) a spider

(d) a bacterium

  

33. The gas evolved when ethanol reacts with sodium metal is

(a) H₂

(b) CO₂

(c) H₂O

(d) CO

  

34. Which of the following elements is not present in stainless steel?

(a) Iron

(b) Tungsten

(c) Chromium       

(d) Nickel

  

35. Which of the following can't be used to make a solar cell?

(a) Silicon

(b) Platinum

(c) Gallium

(d) Germanium

  

36. With the increase in atomic number in period

(a) metallic character decreases

(b) metallic character increases

(c) chemical reactivity decreases

(d) chemical reactivity increases

37. The uterus prepares itself to receive the fertilised egg:

(a) every hour

(b) every day

(c) every month 

(d) every year

  

38. In the reaction

The conc. H₂SO₄ acts as

(a) an oxidizing agent

(b) provides acidic medium

(c) a dehydrating agent

(d) a drying agent

39. Which of the following is not associated with Fleming's left hand rule?

(a) Resistance

(b) Magnetic field

(c) Force

(d) Current

40. The frequency of direct current is

(a) zero

(b) 50 Hz

(c) 60 Hz

(d) 100 Hz

  

41. Every-hot object emits

(a) X-rays

(b) infra-red rays

(c) visible light      

(d) none of these

  

42. An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be :

(a) calcium    

(b) carbon     

(c) silicon      

(d) iron

  

43. Thyroid glands is located:

(a) near the heart

(b) at the base of the brain

(c) in the neck region

(d) between stomach and duodenum

  

44. In the reaction  2PbO +   C → 2Pb + CO₂:

(a) lead is getting reduced

(b) carbon dioxide is getting oxidised

(c) lead oxide is getting reduced.

(d) carbon is getting reduced.

 45. At many places in the ocean, the difference in temperatures between the water 'at the surface of ocean' and 'at deeper levels' is upto

(a) 120°C

(b) 80°C

(c) 50°C

(d) 20°C

 46. The gas which turns fat and oil containing foods rancid is :

(a) hydrogen

(b) oxygen

(c) nitrogen

(d) carbon dioxide

 47. A stream of positively charged particles (alpha particles) moving towards west is deflected towards north by a magnetic field. The direction of magnetic field is :

(a) towards south      

(b) towards east

(c) downward

(d) upward.

  

48. In the equation

NaOH + HNO₃ → NaNO₃ + H₂O nitric acid is acting as

(a) an oxidising agent

(b) an acid

(c) a nitrating agent ^→

(d) a dehydrating agent

  

49. Which order of relative size amongst the following is incorrect?

(a) Li < Na < K

(b) C< Si < Al

(c) Mg > Al < Na   

(d) F < Cl < Br

  

50. A dynamo converts

(a) mechanical energy into sound energy

(b) mechanical energy into electrical energy

(c) electrical energy into mechanical energy

(d) electrical energy into sound energy

ANSWERS:

1. (b)

2. (c)

3. (b)

4. (b)

5. (b)

6. (d)

7. (c)

8. (c)

9. (d)

10. (b)

11. (d)

12. (b)

13. (b)

14. (b)

15. (c)

16. (b)

17. (a)

18. (a)

19. (d)

20. (a)

21. (b)

22. (b)

23. (c)

24. (d)

25. (d)

26. (b)

27. (a)

28. (b)

29. (a)

30. (a)

31. (d)

32. (a)

33. (a)

34. (b)

35. (b)

36. (a)

37. (c)

38. (c)

39. (a)

40. (a)

41. (b)

42. (a)

43. (c)

44. (c) lead oxide is getting reduced.

45. (d)

46. (b) oxygen.

47. (d) upward.

48. (b)

49. (c)

50. (b)