VII Standard - 7th - Science - Second Midterm Test Question Paper - Samacheer Kalvi

 

                                                     II Mid Term Test 

Class:  VII STD                                                                         Marks:  50

Sub: SCIENCE                                                                         Time: 1.30 Hrs

I. Choose the correct answer                                                                  5x1=5

1. International unit of measuring temperature is _______________

a. Kelvin                b. Fahrenheit                         c. Celsius                        d. Joule

2. Mercury is often used in laboratory thermometers because it_______________________

a. is a harmless liquid                    b. is silvery in colour and is attractive in appearance

c. Expands uniformly                    d. is a low cost liquid

3. The chemical change is ____________ .

a. water to clouds            b. growth of a tree    c. cow dung to bio-gas

d. ice-cream to molten ice-cream.

4. ________is an example of a periodic change.

a. Earthquake                b. Formation of rainbow in sky        c. Occurrence of tides in seas.

d. Showering of rain

5. Basis unit of life.

a. Cell                  b. Protoplasm                  c. Cellulose               d. Nucleus

II. Fill in the blanks                                                                                      5x1=5

6. The jelly like substance present in the cell is called _____

7. Cytoplasm plus nucleoplasm is equal to___.

8. Filling up a balloon with hot air is a _____ change.

9. Spoiling of food is a ___________ change.

10. Doctor uses _____________ thermometer to   measure the human body temperature

III. Answer any 10 of the following:                                                         10x2=20

11. Why do we jerk a clinical thermometer before we measure the body temperature?

12. A clinical thermometer is not used to measure the temperature of air, why?

13. a) At room temperature Mercury is in _______________ state.

       b). Heat energy transfer from _______________ to ___________

14. State two examples of periodic changes.

15. Mention any two exothermic reactions.

16. What type of change is colouring of a paper?

17. What type of change is artificial ripening of fruit?

18.a) Bacteria : microorganism :: mango tree :_______

     b) Adipose : tissue :: eye : ______

19. What are the functions of cell wall in plant cell?

20. True or False – If false give the correct answer

          1. Animal cells have a cell wall.

          2. Salmonella is a unicellular bacteria.

21. What are the main things in a nucleus?

22. Write correct sequence from cell to organism?

23. Write a short note on nucleus.

IV. Answer any 4 of the following                                               4x5=20

24.  Convert the given temperature :

   1) 45°C = ........ °F 2) 20°C = ........ °F

25.a) The body temperature of Srinath is 99°F. Is he suffering from fever? If so, why?

    b) Draw the diagram of a clinical thermometer and label its parts.

26. Explain the following statement: Digestion is a chemical change.

27. Draw the plant cell and label the parts

28. Classify the following terms into cells, tissues, organs and write in the

tabular column given below

(Neuron, Lungs. Xylem, brain, adipose, Leaf,  RBC, WBC, hand, muscle, heart, ovum,

squamous, phloem, cartilage.)

Cell	Tissue	Organ

 

29. a)What is the difference between dissolution of sugar and burning of sugar?

      b) Distinguish physical and chemical changes.