6th Science - 2nd Mid Term Exam 2024 - Original Question Paper | Thiruvallur District | English Medium

6th Standard Science - Second Mid Term Test 2024
Solutions

SECOND MID TERM TEST - 2024

Standard: VI

Subject: SCIENCE

Time: 1.30 hrs

Marks: 50

I. Choose the appropriate answer: 5x1=5

1. The unit of Heat is _____.
   a) newton b) joule c) volt d) celsius
   Answer: b) joule
2. Electricity is produced in _____.
   a) transformer b) power station c) electric wire d) Television
   Answer: b) power station
3. Formation of curd from milk is a/an _____ change.
   a) reversible b) fast c) irreversible d) undesirable
   Answer: c) irreversible
4. The unit of measurement used for expressing dimension (size) of cell is _____.
   a) centimeter b) millimeter c) micrometer d) meter
   Answer: c) micrometer
5. The 'Control centre' of the eukaryotic cell is _____.
   a) Cell wall b) Nucleus c) Vacuoles d) Chloroplast
   Answer: b) Nucleus

II. Fill in the blanks: 5x1=5

6. Solids _____ on heating.
   Answer: expand
7. The combination of two or more cells is called a _____.
   Answer: battery
8. Boiling of egg results in _____ change.
   Answer: irreversible
9. I am like a policeman, who am I _____.
   Answer: Cell membrane
10. The term 'Cell' was coined by _____.
    Answer: Robert Hooke

III. Match the following: 5x1=5

Question	Correct Match
11. Control center	Nucleus
12. Food producer	Chloroplast
13. Gate of the nucleus	Nuclear membrane
14. Gate of the cell	Cell membrane
15. Energy producer	Mitochondria

IV. True or False. If false, give the correct answer: 5x1=5

16. Heat is a kind of energy that flows from a hot body to a cold body.
    Answer: True.
17. The unit of heat and temperature are the same.
    Answer: False.
    Correct statement: The unit of heat is Joule, and the SI unit of temperature is Kelvin.
18. The Switch is used to close or open an electric circuit.
    Answer: True.
19. Digestion of food is a physical change.
    Answer: False.
    Correct statement: Digestion of food is a chemical change.
20. Nerve cell is the longest cell.
    Answer: True.

V. Analogy: 5x1=5

21. Ice Cube : 0°c :: Boiling water : _____
    Answer: 100°c
22. Copper : Conductor :: Plastic : _____
    Answer: Insulator
23. Photosynthesis : _____ :: Burning of Coal : Human made change.
    Answer: Natural change
24. Burning of matchstick : _____ change :: Rotation of earth : Slow change.
    Answer: Fast
25. Food producer : Chloroplast :: Power house : _____
    Answer: Mitochondria

VI. Give very short answer (Any 5): 5x2=10

26. Make a list of electrical equipments at home which we get heat from?

• Electric iron
• Water heater (Geyser)
• Electric stove
• Toaster
• Microwave oven

27. Distinguish between heat and temperature (Any 2 points).

Heat	Temperature
It is a form of energy.	It is the degree of hotness or coldness of a body.
Its SI unit is Joule (J).	Its SI unit is Kelvin (K).

28. Draw the circuit diagram for series circuit.

A series circuit diagram shows a battery (power source), a switch, and two or more bulbs connected one after another in a single, unbroken loop.

29. What kind of change is associated with decaying of a plant?

The decaying of a plant is a slow, irreversible, and chemical change.

30. What is a solution?

A solution is a homogeneous mixture of two or more substances. The component present in a lesser amount is called the solute, and the component present in a larger amount is called the solvent.

31. What are the organelles found only in plant cell?

The organelles found only in plant cells are:

• Cell wall
• Chloroplasts
• Large central vacuole

32. Give three examples for eukaryotic cell.

Three examples of eukaryotic cells are:

• Plant cells
• Animal cells
• Fungal cells

VII. Answer in Detail (Any 3): 3x5=15

33. Tabulate the different components of an electric circuit and their respective symbols.

Component	Symbol
Electric Cell	A long line and a shorter, parallel line. (+) for long, (-) for short.
Battery (Combination of cells)	A series of long and short parallel lines.
Switch (Open)	A break in the line with a small circle at each end of the break, and a line angled up.
Switch (Closed)	A continuous line connecting two small circles.
Electric Bulb	A circle with a cross inside it.
Connecting Wires	A straight line.

34. Give one example for each case that happens around you.

• a) Slow and fast change:
  Slow change: Rusting of iron.
  Fast change: Burning of a matchstick.
• b) Reversible and irreversible change:
  Reversible change: Melting of ice.
  Irreversible change: Cooking rice.
• c) Physical and Chemical change:
  Physical change: Tearing paper.
  Chemical change: Digestion of food.
• d) Natural and Manmade change:
  Natural change: A flower blooming.
  Manmade change: Constructing a building.
• e) Desirable and undesirable change:
  Desirable change: Ripening of fruits.
  Undesirable change: Spoiling of food.

35. Tabulate any five cell organelles and their function.

Cell Organelle	Function
Nucleus	Controls all the activities of the cell; known as the 'brain' of the cell.
Mitochondria	Produces energy for the cell; known as the 'powerhouse' of the cell.
Chloroplast	Site of photosynthesis; produces food for the plant cell. (Found in plant cells)
Cell Membrane	Controls the movement of substances into and out of the cell; acts as a gate.
Vacuole	Stores water, food, and waste products. Plant cells have a large central vacuole.

36. Draw a plant cell and mark any 5 parts.

Here is a diagram of a plant cell with 5 important parts marked:

The 5 marked parts are:

1. Cell Wall: Provides structural support and protection.
2. Cell Membrane: Controls what enters and leaves the cell.
3. Nucleus: Controls cell activities.
4. Chloroplast: Site of photosynthesis.
5. Large Central Vacuole: Stores water and maintains turgor pressure.

*** End of Solutions ***