Flashcards - General Aptitude

If 15% of a number is 45, the number is: Reveal answer

C. 300

0.15 × N = 45 ⇒ N = 300.

Find the odd one out: 2, 3, 5, 7, 9, 11 Reveal answer

B. 9

9 is not prime.

A train covers 120 km in 2 hours. Average speed is: Reveal answer

C. 60 km/h

120/2 = 60 km/h.

Simple interest on 1000 at 10% for 2 years is: Reveal answer

B. 200

SI = PRT/100 = 200.

Average of 10, 20, 30 is: Reveal answer

B. 20

(10+20+30)/3 = 20.

25% of 80 equals: Reveal answer

B. 20

0.25 × 80 = 20.

If 3x = 21, x equals: Reveal answer

C. 7

x = 7.

Next number: 2, 4, 8, 16, ? Reveal answer

C. 32

Powers of 2.

Ratio 2:3 of total 50 means first share is: Reveal answer

B. 20

2/5 × 50 = 20.

Area of a rectangle 5 × 8 is: Reveal answer

B. 40

5 × 8 = 40.

If cost price is 80 and profit 25%, selling price is: Reveal answer

B. 100

80 × 1.25 = 100.

LCM of 4 and 6 is: Reveal answer

C. 12

LCM(4,6)=12.

HCF of 12 and 18 is: Reveal answer

C. 6

HCF=6.

A can finish work in 10 days, B in 15. Together in: Reveal answer

B. 6 days

1/10+1/15=1/6 ⇒ 6 days.

Perimeter of a square of side 7 is: Reveal answer

C. 28

4 × 7 = 28.

Discount 20% on 500 gives price: Reveal answer

B. 400

500 × 0.8 = 400.

If 5 workers finish in 12 days, 10 workers (same rate) take: Reveal answer

B. 6 days

Work ∝ workers inversely ⇒ 6 days.

Probability of heads in one fair coin toss: Reveal answer

B. 1/2

Two equally likely outcomes.

Median of 3, 5, 7 is: Reveal answer

B. 5

Middle value is 5.

Compound interest idea for one year at rate r is nearest to: Reveal answer

A. Simple interest for one year

For one year CI ≈ SI at same rate if compounded annually.

Speed 90 km in 90 minutes equals: Reveal answer

C. 60 km/h

90 min = 1.5 h; 90/1.5 = 60.

If a:b = 1:2 and b:c = 2:3, a:c is: Reveal answer

B. 1:3

a:b:c = 1:2:3 ⇒ a:c = 1:3.

Cube of 3 is: Reveal answer

C. 27

3³ = 27.

Square root of 144 is: Reveal answer

C. 12

12 × 12 = 144.

Pipe fills tank in 4 hours; rate is: Reveal answer

C. 1/4 tank/hour

1/4 per hour.

Mixture: 2 parts milk + 1 part water, milk fraction is: Reveal answer

C. 2/3

2 out of 3 parts.

Sum of numbers from 1 to 9 excluding 8 is: Reveal answer

B. 37

1+…+9=45; 45−8=37.

Odd one out: Monday, Tuesday, January, Friday Reveal answer

C. January

January is a month, others are weekdays.

If 40% of x is 80, x is: Reveal answer

C. 200

0.4x=80 ⇒ x=200.

Train 100 m long passes a pole in 10 s. Speed is: Reveal answer

B. 10 m/s

100/10 = 10 m/s.