CBSE Class 8 Science Sample Paper Set 23

CBSE Class 8 Science Sample Paper Set W.Sample Papers are the very important for every student. The sample papers should be practiced to gain extra marks in examinations. The sample papers have been prepared based on summative assessment1 and summative assessment 2 pattern. The sample papers have been prepared based on pattern of last year examinations and as per latest changes in the syllabus. Students, teachers and parents can download all CBSE educational material and very well prepared worksheets from this website.  All CBSE educational material is developed by our panel of teachers, have also been submitted by CBSE teachers and students. 

Q.1 Fill in the blanks with suitable words.

a) Removing the chaff from the grain is called _________.

b) The dense tangle of chromosomes inside the nucleus is called _________.

c) Sugar fermentation carbon dioxide + _________.

d) The best conductor of electricity is _________.

e) The smaller the area over which a force is applied the _________ is the pressure.

f) A lightning conductor allows charge to harmlessly flow to the _________.

Q.2 Choose the correct option. 

i) Which of the following needs to be transplanted ?

a) rice b) wheat c) millets d) mustard

ii) Cheek cells are -

a) epithelial cells b) epidermal cells c) vascular cells d) guard cells

iii) Which of the following is a liquid at ordinary temperature ?

a) carbon b) phosphorus c) oxygen d) bromine

iv) If a force of 200N acts on an area of 20m², the pressure equals -

a) 100 N/m² b) 10 N/m² c) 1000 N/m² d) 1000 Nm²

v) What helps us distinguish between the same note of the same loudness produced by two musical instruments ?

a) pitch b) frequency c) harmonics d) amplitude

vi) When two bodies are rubbed against each other

a) they acquire equal and opposite charges

b) they acquire similar charges

c) one body acquires a charge and the other remains uncharged

d) they acquire different amounts of charge

Q.3 Name the following. 

i) Pesticides used to protect crop plants from diseases.

ii) The control room of the cell.

iii) Bacteria which grows in badly preserved canned food and can cause food poisoning.

iv) A non-metal used to fill balloons.

v) The SI unit of pressure.

vi) The range of sounds we can hear.

Q.4 Give reasons for the following. (any three)

a) We can’t use a cooking utensil made of cardboard.

b) The moon’s force of gravity is less than that of the earth.

c) Protozoans in the bodies of termites and the bacteria in our intestines are helpful.

d) We see a flash of lightning before we hear the accompanying sound of thunder.

Q.5 Define the following terms (any five) 

a) Symbiosis b) Plankton c) vacuole

d) manometer e) galvanisation f) frequency

g) electrostatics

Q.6 Answer the following in not more than 20 words. (any six) (2×6=12)

i) What are weeds?

ii) In what type of cells would you expect chloroplasts to be present?

iii) Bacteria are divided into 4 groups on the basis of their shape. Name these.

iv) Mention two uses of nitrogen.

v) What makes a coaster placed over the rim of a glass of water stick even when you invert it?

vi) What does the loudness of a sound depend on?

vii) What would you expect if a plastic ruler is rubbed vigorously with a woollen cloth?

Q.7 Answer the following in not more than 20 words. (any six) (3×6=18)

i) What is surface irrigation? Mention two modes of irrigation under this category.

ii) Why is the cell known as the structural and functional unit of life?

iii) Mention two ways in which fungi harm us.

iv) Write three physical properties of non-metals?

v) How does (a) oiling and (b) using ball bearings help reduce friction?

vi) How are echoes used in medicine?

vii) Why do the leaves of a gold-leaf electroscope diverge when a charged body is brought in contact with its disc? Do they always diverge to the same extent?

Q.8 Answer the following in not more than 40 words. (any five) (5×5=25)

i) What is nitrogen cycle.

ii) What are the basic differences between plant cells and animal cells?

iii) Explain how the growth of algae harms water bodies.

iv) Describe an activity to show that the ‘lead’ of a pencil conducts electricity but a piece of sulphur does not.

v) How is the pressure in a liquid related to depth? How would you demonstrate this?

vi) Explain how we hear.

vii) How does lightning occur?

Q.9 Draw well labelled diagrams of any two of the following. (3×2=6)

i) Three different types of muscles

ii) Structure of Escherichia coli found in human intestine

iii) Larynx

iv) Paramoecium

Q.10 Look at the diagram given below and answer the questions that follow. (2½+1+1½=5)

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