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

 

SECOND MID TERM TEST

Class : VII                                                                                          Time : 1.30 Hours

Subject : SCIENCE                                                                           Marks : 50

I. Choose the correct answer                                10x1=10

1. 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

2. 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

3. ________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

4. . International unit of measuring temperature is ..........................

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

5. The body temperature of a cow is;

a. 0°C                     b. 37°C                  c. 98°C                   d. 100°C

6.____helps in cell division.

a. Endoplasmic reticulum              b. Golgi complex              c. Centriole         d. Nucleus

7. Which part of the cell is called the brain of the cell ?

a. Lysosome       b. Ribosome        c. Mitochondria               d. Nucleus

7. Basic unit of life ___.

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

9. The jelly like substance present in the cell is called ___.

a. Cytoplasm      b. Tissue              c. Cell wall           d. Bacteria

10. A ___is not an organism.

a. Human             b. Plant                 c. Animal              d. Virus

Answer the following questions (Any 10)               10x2=20

11. Is solar eclipse a periodic change? Give your reason

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

13. Convert the given temperature :

a) 45°C = ........ °F b) 20°C = ........ °F

14. Fill in the blanks

      a. Spoiling of food is a ___________ change. 

      b. Respiration is a _____________ change.

15. A very hot glass on putting in cold water cracks. What does this change indicate?

16. Why do we use Mercury in thermometers?

17. Why Lysosomes are known as scavengers of the cell?

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

19. Distinguish between Smooth Endoplasmic reticulum and Rough Endoplasmic reticulum.

20. Write correct sequence from cell to organism?

21. Analogy :-

a) Cell wall  : Plant cell :  :Centriole: ____

b) Chloroplast : Photosynthesis  : :Mitochondria  :___.

22. What are the main things in a nucleus?

Answer any four in detail                       4x5=20

23. Distinguish physical and chemical changes.  

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

       b. Assertion: The explosion of fire cracker is a physical change.

           Reason: A physical change is a reversible change.

i. Both A and R are true and R is the correct explanation of A.

ii. Both A and R are true but R is not the correct explanation of A.

iii. A is true but R is false.

iv. A is false but R is true

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

26. Write a short note on nucleus.

27. Write about any two organelles in detail.

28. How to explain an ANIMAL CELL in your friend?