TGT Mathematics – Previous Year Practice Set (With Answers)
Day 1 – Number Systems, Algebra, Geometry, Trigonometry, Mensuration, Arithmetic
1. Solve the equation:
Answer:
2. A number is divisible by 9 and 11 and lies between 900 and 1000. Find the number.
Answer:
3. If , find a.
Answer:
4. Solve:
Answer:
x=2+13 or x=2−13
5. If (x−3)(x−4)=7, find the roots of the quadratic.
Answer:
Equation reduces to:
x2−7x+5=0
Roots:
6. For the polynomial
p(x)=2x3−5x2+kx+4,
if (x−1) is a factor, find k.
Answer:
k=−1
7. Find the distance between A(–2, 3) and B(4, –1).
Answer:
8. The midpoint of a line segment is (3, –2). One endpoint is (7, 4). Find the other endpoint.
Answer:
Other endpoint =(−1,−8)
(Worked: If midpoint M = ((x1+x2)/2, (y1+y2)/2) = (3, -2) and one end (7,4), solve for the other.)
9. If , find cosΞΈ and tanΞΈ.
Answer:
(First quadrant assumed.)
10. Evaluate:
Answer:
11. A triangle has sides 7 cm, 8 cm, 9 cm. Find its area (Heron’s formula).
Solution:
s=27+8+9=12
Area
=s(s−a)(s−b)(s−c)=12⋅5⋅4⋅3=720=125
Answer:
125 cm2
12. A cone has radius 7 cm and height 24 cm. Find its slant height.
Answer:
l=72+242=49+576=625=25 cm
13. The average of 7 numbers is 18. If one number, 42, is removed, what is the new average?
Solution:
Total initially =7×18=126. After removing 42, new total =126−42=84.
New average =84/6=14.
Answer:
14
14. A class has boys and girls in the ratio 5:3. If there are 40 students, how many girls are there?
Solution:
Total parts =5+3=8. Each part =40/8=5.
Girls =3×5=15.
Answer:
15 girls
15. A bag contains 3 red, 5 blue and 2 green balls. One ball is drawn at random. What is the probability that it is blue?
Solution:
Total balls =3+5+2=10. Favorable outcomes (blue) =5.
Probability =5/10=1/2.
Answer:
21