1. If 11 eggs are bought for Rs. 10 and l0 eggs are sold for Rs. 11, what is the percentage of gain or loss ?
- 10%
- 11%
- 21%
- 9%
2.How many numbers up to 400 are divisible by 5 and 7 together ?
- 12
- 10
- 15
- 11
Ans:
L.C.M of 5 & 7 = 35
400 ÷ 35 = 11
4.Which one is a perfect number ?
- 9
- 25
- 6
- 16
Ans: C) 6
Factors(ଗୁଣନିୟକ) of 6 = 1,2,3,6
ଯେଉଁ ସଂଖ୍ୟାର ଗୁଣନୀୟକ ମାନଙ୍କର ସମଷ୍ଟି ସେହି ସଂଖ୍ୟାର ଦୁଇଗୁଣ ସହ ସମାନ ହୁଏ ତାହାକୁ ପରିପୂର୍ଣ୍ଣସଂଖ୍ୟା(Perfect Number) କୁହାଯାଏ।
5.Find the number which when multiplied by 15 is increased by 196.
- 10
- 12
- 16
- 14
(D) 14
Let the number be x.
multiply by 15 = 15x
Incrased = 15x – x = 14x
According to question 14x = 196
x = 14
6.At the end of a business conference the ten people present all shake hands with each other once. How many handshakes will there be altogether?
- 45
- 90
- 10
- 20
Ans: A) 45
Formula n × (n-1) ÷ 2
7.In a row of boys, if A who is tenth from the left and B who is ninth from the right interchange their positions, A becomes fifteenth from the left. How many boys are there in the row?
- 19
- 25
- 23
- 20
Ans: C) 23
Observe the diagram carefully:-
Total number of boys in the row = 9 + 4 + 8 + A + B = 23 boys
or 
By interchanging positions A becomes 15th position from the left.
Number of boys in the row = 15 + 9 – 1 = 23
So the answer is 23.
8.Pointing to a lady on the platform, Manju said, “She is the sister of the father of my mother’s son.” Who is the lady to Manju ?
- Mother
- Aunt
- Sister
- Niece
Ans: B) Aunt
The family tree diagram is shown below:
Thus, the lady is the aunt of Manju.
9.Find the total surface area of cylinder whose radius is 7 cm and height is 3 cm.
- A) 240cm2
- 440cm2
- 401cm2
- 21cm2
Ans: B) 440cm2
TSA = 2πr (h+r)
2 × 22/7 × 7 (7+3)
= 440 cm2
10.Find the surface area in cm² of a sphere of diameter 28 cm.
- 3422
- 3852
- 2464
- 3550
Ans: C) 2464
SA of Sphere = 4πr²
4 × 22/7 × 14²
= 2464