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Title: Test copy
Description: Use in class 10 test

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Central Board of Secondary Education

Class-X
Science-086
SAMPLE QUESTION PAPER 2019-20
TIME: 3 Hrs
...
M
...
The question paper comprises three sections – A, B and C
...

2
...

3
...

4
...
They are to be answered in one word or in one sentence
...
All questions in Section B are three-mark, short-answer type questions
...

6
...
These are to be
answered in about 80 – 90 words each
...
This question paper consists of a total of 30 questions
...


1

2

How does valency of an element vary across a period?

1

3

Answer question numbers 3(a) - 3(d) on the basis of your understanding of the
following paragraph and the related studied concepts
...
India is the world’s fifth largest wind-power producer and the largest
windmill facilities in India are installed in Tamil Nadu
...
It uses wind
from the Arabian Sea to produce renewable energy
...


The electrical generators used on wind turbines in sites like Muppandal, produce an
output AC of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating
...

3(a)

State the principle behind electric generator
...
What is meant by this statement?

1

3(c)

Why do you think Muppandal is at an advantageous position for this project?

1

3(d)

Based on the data represented in the graph below, which of the two cities A or B would be
an ideal location for establishing a wind-farm and why?

1

4

Question numbers 4(a) - 4(d) are based on the two tables given below
...



Table A (Blood glucose chart)
Mean Blood Glucose Level (mg/dL)
380

Doctor’s advice
needed

350
315
280
250
215

Good

180
150

Excellent

115
80
50



2


Central Board of Secondary Education
Table B (Blood Report of Patient X and Y)
Time of check

Blood Glucose ranges (mg/dL)
Patient X

Patient Y

Before breakfast (Fasting)

< 100

70 – 130

Before lunch, supper and
snack

< 110

70 – 130

Two hours after meals

< 140

< 180

Bedtime

< 120

90- 15

4(a)

Refer to Table B showing the blood report of the levels of glucose of patients X and Y
...


1

4(b)

Identify the hormone whose level in the blood is responsible for the above disease
...

ii) Low sugar and high protein diet
...

iv) Low sugar and high fiber diet
...
This is because

1

i) pupils do not open at all in the dark
...

iii) light travels slower in a dark room
...

OR
The phenomena of light responsible for the working of the human eye is
i) reflection
ii) refraction
iii) power of accommodation
iv) persistence of vision
1



3


Central Board of Secondary Education

6

When a 4V battery is connected across an unknown resistor there is a current of 100 mA
in the circuit
...
4 Ω
7

Unit of electric power may also be expressed as:

1

i) volt-ampere
ii) kilowatt-hour
iii) watt-second
iv) joule-second
8

It was found that water from a river was contaminated with Coliform bacteria
...

ii) Decomposition of vegetable matter into compost
...

iv) Decomposition of calcium carbonate to form quick lime and carbon dioxide
...
Which element is most likely to form an acidic oxide?

1

A
B
C
D

i)

A

ii) B
iii) C
iv) D
OR
Elements P, Q, R and S have atomic numbers 11, 15, 17 and 18 respectively
...
Select the correct answer to these questions from the codes (i), (ii),
(iii) and (iv) as given below
i) Both A and R are true and R is correct explanation of the assertion
...

iii) A is true but R is false
...

13

Assertion: Following are the structural isomers of butane
...

14

Assertion: A fuse wire is always connected in parallel with the mainline
...


SECTION B
15

(i) Write two observations when lead nitrate is heated in a test tube
...

(iii) Write a balanced chemical equation to represent the above reaction
...


3

(i) Name the compound ‘X’ and give its chemical formula
...

(iii) Give one use of compound ‘X’ besides an antacid
...

(i) What is the correct way of preparing dilute sulphuric acid? Give reason
...
To which period of
the modern periodic table do these two elements belong? What type of bond will be
formed between them and why? Also give the chemical formula of the compound
formed
...


3

(ii) Why do we not find food chains of more than four trophic levels in nature?
OR
How will you create an artificial aquatic ecosystem, which is self-sustainable?




6


Central Board of Secondary Education
19

Explain the processes of aerobic respiration in mitochondria of a cell and anaerobic
respiration in yeast and muscle with the help of word equations
...
Explain the inheritance pattern of F1 and F2 generations with the help of a
cross following the rules of inheritance of traits
...


3

21

Explain giving reasons the bending of the shoot tip of a plant towards light source coming
from one side of the plant
...


3

(i) What should be the range of the object distance in the above case?
(ii) Will the image be smaller or larger than the object? Draw a ray diagram to show the
formation of image in this case
...
Draw a circuit diagram showing
electric fuse and earthing as safety devices
...
After passing through the prism, it produces a spectrum XY on the
screen
...

(ii) State the colours seen at X and Y
...
A light beam is passed through one side of the combination
...


SECTION C
25

Metal X is found in nature as its sulphide XS
...
Identify the metal X
...




7

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Central Board of Secondary Education
OR
State the reason for the following:
(i)

Aluminium oxide is called an amphoteric oxide
...


(iii)

Hydrogen gas is not evolved when most metals react with nitric acid
...


(v)

Sodium or potassium metals are kept immersed under kerosene
...

(iii) Which of the above compounds when heated at 443K in the presence of
concentrated H2SO4 forms ethene as the major product? What is the role played by
concentrated H2SO4 in this reaction? Also write the chemical equation involved
...
Name the major product formed and mention one of its
important use
...

(ii) Explain the process of double circulation with the help of a flow chart
...

(ii) Why do multicellular organisms use complex way of reproduction?



8

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Central Board of Secondary Education
OR
(i) Describe the role of prostate gland, seminal vesicle and testes in the human male
reproductive system
...



29

(i) Consider a conductor of resistance ‘R’, length ‘L’, thickness‘d’ and resistivity ‘ρ’
...
What will be the new resistivity of
each of these parts? Why?

5

(ii) Find the resistance if all of these parts are connected in:
(a) Parallel
(b) Series
(iii) Out of the combinations of resistors mentioned above in the previous part, for a
given voltage which combination will consume more power and why?


30

(i) A lens produces a magnification of -0
...
Is this a converging or diverging lens? If
the focal length of the lens is 6 cm, draw a ray diagram showing the image formation
in this case
...
She was surprised to see
that in a particular direction, the beam of light continues to move along the same
direction after passing through the lens
...
Draw a
ray diagram to support your answer
...
Find the refractive index of that medium with respect to air?
(ii) A glass slab made of a material of refractive index n1 is kept in a medium of
refractive index n2
...
Draw the path of the rays of light emerging from
the glass slab, if (i) n1> n2 (ii) n1 = n2 (iii) n1< n2

*********************



9

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Central Board of Secondary Education




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Title: Test copy
Description: Use in class 10 test