BAF Shaheen College Dhaka Practice Pre- test Examination

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BAF Shaheen College Dhaka Practice Pre- test Examination- 2020

Class: VIII (English Version) Sub: Science (MCQ)

Time: 30 minutes Full Marks: 30

(N.B.- Answer all the questions. Each question carries one mark. Block fully, with ball-point pen, the circle of the letter that stands for the correct/best answer in the “Answer Sheet” for Multiple Choice Questions Examination.)

Code: 127

1. What is the formula for Aluminium Phosphate?

a) AlPO4 b) Al2(PO4)3

c) Al4(PO4)3 d) Al3(PO4)2

2. An element ‘D’ formed a compound ‘DO3’ with oxygen. What was the valency of D.

a) 2 b) 3 c) 4 d) 6

3. _____ acid is present in pineapple.

a) Tartaric b) Ascorbic c) Citric d) Malic

4. In the dry cell-

i) Electricity flows from carbon rod to zinc rod ii) Zinc cylinder act as anode

iii) carbon rod act as cathode Which of the following is correct?

a) i, ii b) i, iii c) ii, iii d) i, ii, iii 5. George Simon Ohm was born in the year of-?

^{a) 1789} b) 1798 c) 1879 d) 1897

6. How many replaceable H⁺ ion is there in oxalic acid?

a) 1 b) 2 c) 3 d) 4 7. Some use of radioactive isotopes are-

i) ³²P isotope to control insects in plant ii) Beta ray to kill germs from food

iii) Radioactive radiation to sterilize medical instrument

Which of the following is correct?

a) i,ii b) i, iii c) ii, iii d) i, ii & iii 8. In which of the following self-pollination is done?

a) Mustard, Datura b) Pumpkin, Shimul c) Datura, Shimul d) Papaya, Shimul

9. In Bangladesh, the frequency of alternating current is ___cycle/sec.

a) 40 b) 50 c) 60 d) 70

10. Litmus paper obtained from color of lichen leaves is-

a) Red b) Yellow c) Green d) Blue

11. If a lift is going downward with the same velocity of 1 ms^-1. What will be the effective value of ‘g’

inside the lift?

a) 1 ms^-2 b) 9.8 ms^-2 c) 8.8 ms^-2 d) 10.8 ms^-2 12. Electronic configuration of which element is 2,8,5?

a) Si b) Al c) S d) P 13. How exterior surface of the cerebrum?

a) Convoluted & White b) Convoluted & Grey c) Plain & White d) Plain & Grey

14. Which process has a significant role in water cycle?

a)

Transpiration

b)

Osmosis

c) Imbibition

d)

Diffusion

15. Which process carries oxygen from blood to lymph?

a) Osmosis b)

Diffusion

c) Absorption d)

Transportation

16. Which one is the example of a solute?

a) Sugar b) Water c) Sarbat d) Kerosin 17. Which dissolve in solvent?

a) Solvent b) Solution c) Solute d) Product 18. In the case of electrolysis of NaCl - i) Gas bubbles are produced ii) Grey layer is formed on cathode iii) Water act as electrolyte

a) i, ii b) i, iii c) ii, iii d) i, ii, iii 19. When lemon juice in mixed with baking soda, then ____ are produced.

i) Calcium citrate ii) CO2

iii) Water

a) i, ii b) i, iii c) ii, iii d) i, ii, iii 20. Hind brain controls-

i) Vision ii) Speech iii) Movement

a) i, ii b) i, iii c) ii, iii d) i, ii, iii 21. Which helps to ripen fruits?

a) Auxin b) Gibberelin

c) Cytokainin d) Ethylin

22. Example of insect pollinated flower- i) Pumpkin

ii) Paddy

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iii) China-rose

a) i, ii b) i, iii c) ii, iii d) i, ii, iii 23. What is called the pore that is near to the nodal part of the seed?

a) Plumule b) Micropile c) Cotyledon d) Radicle

24. What is the name of the organ ‘C’ of the figure?

a) Dorsal Aorta b) Kidney c) Urinary bladder d) Ureter

25. Except the organ “A” the other excretory organs are-

i) Skin ii) Stomata iii) Lung

a) i,ii b) ii, iii c) i, iii d) i, ii, iii Two fuses of 5 ampere & 10 ampere twisted. Answer question no. 26 & 27.

26. There total value will be _____ ampere?

a) 5 b) 10 c) 15 d) 50

27. If they are used in a source of 240 volt & 12 ohm resistance, then-

i) they will burn

ii) flow of electricity will be hindered

iii) ammeter reading will be only 20 ampere Which of the following is correct?

a) i, ii b) i, iii c) ii, iii d) i, ii, iii

28. The example of semi-permeable membrane is- i) Polythene

ii) Cell membrane

iii) Cell membrane of fish potka Which of the following is correct?

Based on the above figure answer the questions 29 and 30.

29. Which part of the figure is used to add one neuron to another?

a) A b) B c) C d) D 30. In the above figure “A” is- i) Round, oval or star shaped

ii) Composed of cell membrane, cytoplasm and nucleus.

iii) Allows information to pass another neuron.