Rajasthan Board Class 8th Model Question Paper 2024 Science

MODEL
PAPER बोर्ड ऑफ सेकं डरी एज्युके शन राजस्थान
RAJASTHAN BOARD

2024


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ELEMENTARY EDUCATION COMPLETION CERTIFICATE EXAM 2024

CLASS -8

Subject- Science

Sample Question Paper

Duration 2:30 hours Max.Marks

Objective Type Questions (1-8)

Which poisonous gas is formed due to incomplete combustion of fuel ?

(a)Oxygen (b) Nitrogen

(c)Carbon dioxide (d) Carbon mono oxide [ ]

Which liquid fuel is used at home ?

(a)LPG (b)CNG

(c)Coal (d)Petrol [ ]

1

What suggestions would you give for stopping deforestation?

(a) Re- using paper (b) Re- cycling of paper

(c) Saving paper (d) All the above [ ]

The unit of frequency -

(a)Second (b) Meter

(c)Hertz (d) Newton [ ]

Which of the following suggestions would you give your friend to reduce noise pollution
in residential areas-

(a) Reduce the sound volume of television and radio

(b) Setting up industrial Machines away from the city

(c) Reduce the use of vehicle horns.

(d) All the above [ ]

2

Which of the following substance is a good conductor of electricity-

(a)Rubber (b)Aluminium

(c)Wood (d)Plastic [ ]

Why is chromium electroplating done on gas burners , bicycle handlebars, wheel rims
etc--

(a) Chromium has a shiny appearance.

(b) It does not get corroded.

(c) It resists scratches

(d) All the above [ ]

Which of the following cannot be easily charged by friction ?

(a) Plastic scale (b) Inflated ballon

(c) Copper object (d) Woolen Sweater [ ]

3

Very Short Answer type Questions (9-12)

Write the traditional and modern techniques/methods of Irrigation in
the following table-

Moat, Drip system, Dhekli, Sprinkler system, Rahat (lever system)

Ans

Traditional techniques/methods Modern techniques/methods
1. 1.
2. 2.
3. 3.
4. 4.

What will you use in the manufacturing of antibiotic medicines?

Ans______________________________________________________________________

1+1=2

Write the full form of LPG and CNG ?

Ans
(1) LPG:
___________________________________________________________________
(2) CNG:________________________________________________________

4

2

Why do players use spiked shoes ?

Ans______________________________________________________________________

4x1 =4

1
2

3

4

Match the following

(a )Chemical Fertilizer (1) Separation of grain from chaff.

(b) Carbonic Manure (2) Urea and super phosphate

(c) Kharif crop (3) Animal waste, cow dung, plant matter

(d) Threshing (4) Rice and corn

Explain the importance of Rhizobium bacteria in nitrogen fixation ?

Ans_______________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________

5

x1 = 4

[ ]

(a) Fossil fuels are exhaustible resources . [ ]

[ ]

(b) Coal and Petrol are unlimited resources. [ ]

[ ]

(c) Coal tar is a mixture of different substances . [ ]

[ ]

(d) Paraffin , wax are used in making ointment, candle, Vaseline etc . [ ]

2x2 =4

Write any two differences between Combustion and Flame ?

Combustion Flame
1. 1.
2. 2.

2+2 =4

Explain the meaning of the following-

(a) Red Data Book

(b) Biodiversity

Ans(a)_________________________________________________________________

6

Ans(b)_________________________________________________________________

x1 =4

Fill in the blanks using appropriate words-

[ binary fusion , Hydra, viviparous , oviparous fusion, fertilisation ]

1- Amoeba reproduces by _________________
2- The fusion of an egg and sperm is called _______________
3- Animals such as human beings, cows and dogs which give birth to young ones are called
_____________ animals.
4- Reproduction by budding takes place in ___________

Explain the relationship between pressure and force through a formula ?

Ans_______________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________

7

________________________________________________________________________
________________________________________________________________________

Explain by giving an example how friction is both enemy and friend ?

Ans_______________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________

2+2 =4

Explain the following-

(a) Conductor Material

(b) Chemical effect of electric current

Ans(a)_________________________________________________________________

Ans(b)_________________________________________________________________

8

Write two suggestions for taking proper care of our eyes.

Ans(1)_____________________________________________________________
________________________________________________________________________
________________________________________________________________________
(2)______________________________________________________________________
________________________________________________________________________

4+2+2 =8

(a) Write two rules related to Road safety .
(b) Write any two difference between external fertilisation and internal fertilisation .
(c) Draw a labelled diagram of Human ear .

OR

(a) What precautions should you keep in mind while driving?
(b) Describe any one method of asexual reproduction with the help of a labelled
diagram.
(c) Write two measures to control noise pollution .
Ans(a)_________________________________________________________________

9

Ans(b)_________________________________________________________________

Ans(c)_________________________________________________________________

4+4 =8

:

(a) What do you understand by a balanced diet? What is the importance of essential
nutrients in food?
(b) Force can change the shape of any object? Explain with the help of example.

OR
(a) Write the names of Endocrine glands of human body and draw a labeled diagram of
their position in human body.
(b) Liquid exerts pressure on the walls of a vessel? Explain with the help of a diagram.

10

Ans(a)_________________________________________________________________

Ans(b)_________________________________________________________________

,
4+4 =8

(a) Draw a diagram of lightning conductor and explain how it helps in protecting
buildings from the effect of lightning?
(b) How many types of Reflection? Draw diagram and explain.

OR
(a) Draw a suitable diagram to explain that like charges repel each other.
(b) What is Reflection? Explain with suitable diagram. Write the two rules of Reflection.

Ans(a)_________________________________________________________________

11

Ans(b)_________________________________________________________________

12

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