# ISRO Aptitude Questions with Answers

8 previously-asked aptitude questions from ISRO's hiring process, each with the correct answer and a worked explanation. Written against the company's actual test pattern.

_Source: Astra (https://useastra.in). Updated 2026-09-05._

### 1. What is 20% of 400?

A. 80
B. 60
C. 100
D. 70

**Answer:** 80

**Explanation:** 20% of 400 = 0.20 * 400 = 80.

### 2. Find the next term in the series: 5, 10, 20, 40, ?

A. 80
B. 60
C. 70
D. 100

**Answer:** 80

**Explanation:** Each term doubles, so 40 * 2 = 80.

### 3. What is the average of 100, 150 and 200?

A. 150
B. 125
C. 175
D. 160

**Answer:** 150

**Explanation:** Sum is 450 and there are 3 numbers, so the average is 150.

### 4. A vehicle covers 200 km in 4 hours. What is its speed?

A. 50 km/h
B. 40 km/h
C. 60 km/h
D. 45 km/h

**Answer:** 50 km/h

**Explanation:** Speed = 200 / 4 = 50 km/h.

### 5. What is 30% of 300?

A. 90
B. 80
C. 100
D. 70

**Answer:** 90

**Explanation:** 30% of 300 = 0.30 * 300 = 90.

### 6. Choose the synonym of the word VAST.

A. Huge
B. Small
C. Tiny
D. Little

**Answer:** Huge

**Explanation:** Vast means very large in extent, which matches huge.

### 7. Choose the antonym of the word BEGIN.

A. End
B. Start
C. Open
D. Commence

**Answer:** End

**Explanation:** Begin means to start; its opposite is end.

### 8. Find the next term in the series: 1, 4, 9, 16, ?

A. 25
B. 20
C. 24
D. 30

**Answer:** 25

**Explanation:** These are perfect squares, so the next is 5 squared = 25.

More ISRO preparation, including the full recruitment process: https://useastra.in/campus/isro