# Document 267554

SAMPLE PAPER, SA – I
MATHEMATICS
CLASS – X
Time – 3 hours
MM: 90
GENERAL INSTRUCTIONS
1 All questions are compulsory.
2 The question paper consists of 34 questions divided into four sections –
A, B, C and D.
3 Section A contains 8 MCQs of 1 mark each, section B contains 6 questions of 2
marks each, section C contains 10 questions of 3 marks each and section D
contains 10 questions of 4 marks each.
4 There is no overall choice in the paper. However, internal choice is provided in one
question of 2 marks, three questions of 3 marks and two questions of 4 marks.
5 Use of calculators is not permitted
Questions
Section A
Q 1:
Q 2:
How many polynomials are there having 9 and -7 as zeroes?
a) Two
b) Three
c) Four
d) More than four
Q 3:
Q 4:
sin40 -cos 50 =?
a) 1
b) 0
c) – sin10
d) cos10
Q 5:
Q 6:
Q 7:
The mode of a frequency distribution is obtained graphically from:
a) an ogive
b) a histogram
c) a frequency polygon
d) a bar graph
Q 8:
If a pair of linear equations is consistent, then their graph lines will be
a) parallel
b) coincident
c) intersecting
d) intersecting or coincident
Section B
Q 9:
The given distribution shows the number of runs scored by some top batsmen of the
world in one-day international cricket matches.
Class
3000 – 4000
4000 – 5000
5000 – 6000
6000 – 7000
7000 – 8000
8000 – 9000
9000 – 10000
Frequency
5
12
13
9
5
4
6
Find the number of batsmen who scored less than 7000 runs.
Q10:
Express 0.254 as a rational number in the simplest form.
Q 11:
Q 12:
Taking  = 30 , verify that sin 3  = 3 sin  - 4sin3 
OR
Q 12:
Without using trigonometric tables, evaluate:
sec 70 sin 20 + cos 20 cosec 70
Q 13:
Write two rational numbers between
and
Q 14:
In the given figure,  PQR = 90 , PS = 10 cm, QS = 6 cm and SR = 9 cm.
Calculate the length of PR.
Section C
Q 15:
OR
Q 15:
Prove that
is irrational.
Q 16:
An electronic device makes a beep after every 60 seconds. Another device makes a
beep after every 62 seconds. They beeped together at 10 am. At what time will they
beep together at the earliest?
Q 17:
Find the mean of the following data:
Class-interval
Frequency
0 – 10
7
10 – 20
8
20 – 30
12
OR
30 – 40
13
40 – 50
10
Q 17:
Find P if the mean of the given data is 15.45
Classes
Frequency
0–6
6
6 – 12
8
12 – 18
P
18 – 24
9
24 – 30
7
Q 18:
If A, B and C are interior angles of ∆ABC, show that:
Q 19:
On his birthday Raj decides to distribute gifts to the poor people of different age groups
residing near his colony. To buy suitable gifts for each age group he notes the age
group and the corresponding number of people in the form of table as shown below:
Age – group
No. of people
i)
ii)
25 – 30
25
30 – 35
34
35 – 40
50
Find the mode.
What lesson do you get from this?
Q 20:
Solve the following system of linear equations:
OR
Q 20:
Q 21:
40 – 45
42
45 – 50
38
50 – 55
14
Q 22:
If the diagonal BD of a quadrilateral ABCD bisects both  B and  D, prove that
Q 23:
If 5cot  =3, find the value of
Q 24:
In ∆ABC, D is a point on AB, E is a point on AC and DE ll BC. If 4AD = 5DB, find
Section D
Q 25:
Calculate the median for the following data:
Marks obtained
Below 10
Below 20
Below 30
Below 40
Below 50
Below 60
No. of students
6
15
29
41
60
70
Q 26:
Prove that:
2(sin6  + cos6  ) – 3 (sin4  + cos4  ) + 1 = 0
OR
Q 26:
Without using trigonometric tables, evaluate the following:
Q 27:
Q 28:
Q 29:
Find the mean, mode and median for the following data:
Class
Frequency
0 -10
8
10 – 20
16
20 – 30
36
30 – 40
34
40 – 50
6
Total
100
Q 30:
Q 31:
Q 32:
Q 33:
A number consists of three digits whose sum is 17. The middle digit exceeds the sum
of the other two digits by 1. If the digits of the number are reversed, the number is
diminished by 396, find the number.
Q 34:
In ∆ ABC,  ABC > 90 and AD CB (produced).
Prove that AC2 = AB2 + BC2 + 2BC.BD
OR
Q 34:
In the given figure, ∆PQR is right angled at Q and the points S and T trisect the side
QR. Prove that 8PT2 = 3PR2 + 5PS2.
Section A
A 1:
A 2:
A 3:
A 4:
sin 40 – cos 50
Ans. : (b) 0
= cos (90 – 40 ) – cos50
= cos50 – cos50
=0
A 5:
In ∆ABD,
AB2 = 32 + 42 = 9 + 16 = 25
cot  =
Ans. :
A 6:
A 7:
Ans : (b) a histogram
A 8:
Ans: (d) intersecting or coincident
Section B
A 9:
The number of batsmen who scored less than 7000 runs
= 5 + 12 + 13 + 9 = 39
Hence, 39 batsmen scored less than 7000 runs.
A 10:
A 11:
A 12:
OR
A 12:
A 13:
A 14:
In ∆ PSQ,
PQ2 = PS2 – QS2
[Pythagoras Theorem]
PQ2 = 102 - 62
= 100 – 36 = 64
PQ =
= 8 cm
In ∆ PQR,
QR = QS + SR = (6 + 9) cm = 15 cm
and PR2 = PQ2 + QR2
[Pythagoras Theorem]
PR2 = 82+152 = 64 + 225 = 289 cm2
PR =
= 17 cm
Section C
A 15:
OR
A 15:
A 16:
One electronic device makes a beep after every 60 seconds and another device makes
a beep after every 62 seconds.
Interval of beeping together = LCM (60 seconds, 62 seconds)
LCM (60, 62) = 2 x 31 x 30
= 1860
LCM (60 seconds, 62 seconds)
= 1860 seconds
=
They beeped together at 10 am.
They will beep together again at 10 hr 00 min + 31 min
= 10 hr 31 min
= 10:31 am
2 60, 62
30, 31
A 17:
Class – interval
0 – 10
10 – 20
20 – 30
30 – 40
40 – 50
Frequency
Class mark
7
8
12
13
10
5
15
25
35
45
35
120
300
455
450
OR
A 17:
Class – interval
0–6
6 – 12
12 – 18
18 – 24
24 – 30
Frequency
6
8
P
9
7
Class mark
3
9
15
21
27
18
72
15p
189
189
A 18:
A 19:
i)
Class
ii)
Frequency
25 – 30
30 – 35
25
34 ----
35 – 40
50 ----
40 – 45
42 ----
45 – 50
50 – 55
38
14
It is good to share one’s happiness with people in need.
A 20:
OR
A 20:
A 21:
A 22:
Given: A quadrilateral ABCD in which diagonal BD bisects both
Proof :
In ∆ ADB and ∆ CDB,
A 23:
A 24:
 ADE =  ABC [ DE ll BC]
 AED =  ACB
[ DE ll BC]
A = A
[Common angle]
∆ADE ~ ∆ABC [AAA similarity criterion]
[Given]
…. From (i) and (ii)
ar(∆ ADE) : ar(∆ ABC) = 25 : 81
Section D
A 25:
Class interval
0 – 10
10 – 20
20 – 30
30 – 40
40 – 50
50 – 60
Frequency
6
9
14
12
19
10
Cumulative frequency
6
15
29
41
60
70
A 26:
OR
A 26:
A 27:
A 28:
A 29:
Class
0 – 10
10 – 20
20 – 30
30 – 40
40 – 50
Frequency
8
16
36
34
6
Class mark
5
15
25
35
45
= 20 +
= 20 +
= 20 +
= 20 + 7.22 = 27.22
Median = 27.22
iii) Mode = 3 (Median) – 2 (Mean)
Mode = 3 × 27.22 – 2 × 26.4
= 81.66 – 52.8
= 28.86
Mode = 28.86
Cumulative
frequency
8
24
60
94
100
40
240
900
1190
270
A 30:
A 31:
–2
–6
0
–2
3
4
–3
6
0
5
3
4
A 32:
=
=
=
=
=
=
Hence proved.
A 33:
Hence, the required number = 100 × 6 + 10 × 9 + 1 × 2
= 600 + 90 + 2
= 692
A 34:
Given: ∆ABC in which
To prove: AC2 = AB2 + BC2 + 2 BC.BD
Proof :
AB2 = AD2 + BD2 ------- (i)
…. (Pythagoras Theorem)
…..
(Pythagoras Theorem)
= AD2 + [BC + BD]2
[
CD = BC+BD]
2
2
2
= AD + (BC + BD + 2BC. BD)
= (AD2 + BD2) + BC2 + 2BC. BD
= AB2 + BC2 + 2BC. BD …. From (i)
Hence proved
OR
A 34: