class_vi (4)

7/27/2019 class_vi (4)

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ONLINE ASSIGNMENTS OF THE UNIT-4 “DENSITY AND FLOATATION”, UNIT 14

“CELLS”, UNIT 10 “MIXTURE”

CLASS: VI

Name: Agrim Khatry Sec: E

Roll No: 3UNIT-4 “DENSITY AND FLOATATION”

A. Fill in the blanks

i. The space which an object occupies is the …………………………………… of that object.

ii. 1 cm3 = …………………………………. litre

iii. The mass per unit volume of a substance is called it’s………………………………….

iv. When salt is mixed with water its density ………………………………….

v. There are …………………………………. elements known to us.

vi. …………………………………. is the white shiny metal, liquid at ordinary temperature.

vii. The SI unit of density is …………………………………. per cubic metre.

viii. Wood floats in kerosene and water but …………………………………. In mercury

B. Tick the correct answer.

i. The density of mercury is

a. 0.92 g/cm3 b. 1 g/cm3 c. 13.65 g/cm3 d. 19.3 g/cm3

ii. If mass of 21 cm3 of wax is 28 g, what is its density?

a. 0.84 g/cm3 b. 1.33 g/cm3 c. 1.03 g/cm3 d. 1.44 g/cm3

iii. The formula to calculate volume of cylinder is

a. l × b × h. b. 4/3 πr 3 c. πr 2h d. πr 3h

iv. The SI unit of volume is

a. m

3

b. cm

3

c. km

3

d. dm

3

v. The volume of box with a dimension of 25cm, 15cm and 5cm is

a. 1000 cm3 b. 1875 cm3 c. 1885 cm3 d. 1865 cm3

vi. Calculate the mass of a book with volume of 500 cm3 and density of 5.5 g/cm3.

a. 2750 g b. 2740 g c. 5000 g d. 250 g

C. State whether the following statements are TRUE or FALSE.

i. The formula to measure the volume of a cuboid is l×b×h.……………..

ii. The density if ice is 1gm/cm3.……………

iii. An egg sinks is salt solution and floats in fresh water.………………

iv. The distance from centre to the circumference of a sphere is called diameter.………………

v. Pie (π) is a constant figure whose value is 3.14………………

D. Match the followingCOLUMN A COLUMN B

i. 1 cubic metre mass ( )

ii. The volume of sphere 10,00,000 cm3 ( )

iii. The density of water 4/3 πr 3 ( )

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iv. Total matter contained in a body 1 g/cm3 ( )

UNIT-14 “CELLS”

A. Fill in the blanks

i. ……………….…………………… is the structural and functional unit of life.

ii. …………………………………. acts as a brain of cell.

iii. The cell wall is made up of ……………………………….….iv. Flowers look colourful due to ………….………………………. plastid.

v. ………….………………………. is called the powerhouse of a cell.

vi. ………………….………………. helps to make proteins.

vii. ………………….………………. is an instrument used to view tiny objects.

viii. The only animal with a chlorophyll is …………….……………………..

ix. Nucleus consist of thread like structure called ………………………….……….

x. Plant cells store water and minerals in………………………….……….

xi. ………………………….……….are found in plant cells but not in animal cells.

xii. Animal cells use…………………………..during cell divisions while plant cells do not possess them.

xiii. The………………………….……….controls the entry or exit of substances into and out of the cells.

xiv.

The slides that contain the specimens are kept on the………………………….……….of the microscope for

observation.

B. Tick the correct answer.

i. Who has coined the word ‘cell’?

a. Robert Hooke b. Robert Brown c. Aristotle d. Schleiden

ii. Which cell organelle does the function of excretion?

a. Nucleus b. Plastid c. Vacuole d. Ribosome

iii. Which of the following animal has ‘slipper sole’ shaped body?

a. Amoeba b. Euglena c. Paramecium d. Trypanosome

iv. The fungal cell wall is made up of

a. Chitin b. Protein c. Fats d. Water v. Which one is incorrect statement?

a. Cell wall is permeable.

b. Cytoplasm is present between cell membrane and nucleus.

c. Cell inclusions are metabolically active living substance.

d. Leucoplast is colourless pigment.

vi. Which one is correct statement?

a. Centrosome is a powerhouse of cell.

b. Chloroplast helps in pollination.

c. Nucleus is the control centre of cell.

d. Cells do not combine together to form tissue.

C. State whether the following statements are TRUE or FALSE.

i. Cell membrane is a semi-permeable membrane. ………………………

ii. Plant cell consist of large vacuole at the centre of cell. ………………………

iii. A light microscope can produce a maximum magnification of 1500 X. ………………………

iv. The outermost covering of plant cell is called cell wall. ………………………

v. Amoeba does not have any fixed shape. ……………………

vi. The size of a a cell ranges from 0.5 μm to 100 μm. ………………………

D. Match the following

COLUMN A COLUMN Bi. Coarse adjustment knob Reflector ( )

ii. A mirror in microscope is used as A.V Leeuwenhoek ( )

iii. A long and narrow cell Focus a specimen ( )

iv. Suicidal bag Unicellular ( )

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v. One celled animal Lysosome( )

vi. One who first observed the green pigment of

plant

Nerve cell ( )

UNIT-10 “MIXTURE”

A. Fill in the blanksi. …………………………………… is the process of converting solid directly into vapour.

ii. Insoluble substances that retain in filter paper is ………………………………….

iii. …………………………………. is a method of separating heavier substances from lighter substance in

presence of air.

iv. The mixture of wheat flour and sand is separated by ………………………………….

v. Naturally found water is not………………………………….

vi. Mixing particles in………………………………….mixture can be seen with naked eyes.

vii. Camphor like solids directly change into………………………………….on heating.

viii. We can get pure liquid from its mixture by………………………………….process.

ix. Pure substances are made up of only one type of………………………………….

x. Components of mixture are………………………………….distributed throughout the mixture in

homogeneous mixture.

xi. The clear liquid obtained after filtration is known as………………………………….while the solids that

remains on the filter paper is known as………………………………….

B. State whether the following statements are TRUE or FALSE.

i. Clear liquid obtained after filtration is called distillate. ……………………………….

.

ii. Sublimation is a combined method of evaporation and condensation. ……………………………….

.

iii. Using separating funnel can separate mixture of oil and water. ……………………………….

.

iv. Air is a homogeneous mixture. ……………………………….

.

v. Picking out the food grains from the mixture by the beaks of a bird is a

hand picking method.

……………………………….

.

vi. Ammonium chloride is a sublime substance. ……………………………….

.

vii. The process of pouring clear liquid to another beaker without disturbingthe sediments is called sedimentation.

………………………………..

viii. Muslin cloth can be used as filtering device in filtration. ……………………………….

.

ix. In Gulf countries, drinking water is obtained by sublimation of

seawater.

……………………………….

.

x. Separation of mixture depends upon the properties of components of the

mixture. ……………………….

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C. Match the following

COLUMN A COLUMN B

i. Solute and solvent Distillation ( )

ii. Iron nail and saw dust Solution ( )

iii. Drinking water is obtained from

sea water

Evaporation

( )

iv. Impurities left on filter paper Copper ( )

v. Pure substances Residue ( )vi. Stones and sand Liquid-liquid solution ( )

vii. Copper sulphate Homogeneous mixture ( )

viii. Salt and water Pure substance ( )

ix. Alcohol solution Filtration ( )

x. Pure liquid Heterogeneous mixture ( )

xi. Filtrate and residue Decantation ( )

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class_vi (4)

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