GK Express of 15/02/2025

English Coach

1) Study of Word Origins is known as 

Etymology

2) What is Pangram?

A Sentence that contains all the letters (at least once) of the english alphabet is known as Pangram.

3) The Act of giving human qualities to non- human things is known as?

Personification

4) What is Plutocracy?

A Government by rich people is known as Plutocracy

5) A Person who writes dictionaries is known as?

Lexicographer

Aptitude Coach

6) A man walks 10 km east, then 6 km north. What is the shortest distance to his starting point?

Answer: 11.66 km

✅ Explanation:

The man’s movement forms a right-angled triangle.

The shortest distance is the hypotenuse of the triangle, calculated using Pythagoras' theorem:

7)  A shopkeeper offers two successive discounts of 20% and 10% on an item. What is the total discount percentage?

Answer: 28%

✅ Explanation:

Directly adding 20% and 10% gives 30%, but this is incorrect.

Use the Effective Discount Formula:

8) A and B together can complete a work in 12 days. A alone can do it in 20 days. In how many days can B alone complete the work?

Solution:

Step 1: Work done by A & B together per day is 1/12

Step 2: Work done by A alone per day is 1/20

Step 3: Work done by B per day

So, B alone can complete the work in 30 days.

✅ Final Answer: 30 days

9) How many ways can 5 different books be arranged on a shelf?

Solution:

Formula for Permutations:

Basic Mathematics Coach

10) Find the HCF and LCM of 36 and 48.

Solution:

Factors of 36: 2 × 2 × 3 × 3

Factors of 48: 2 × 2 × 2 × 2 × 3

HCF = 2 × 2 × 3 = 12

LCM = (Common × Remaining) = 2 × 2 × 3 × 2 × 2 = 144

✅ Answer: HCF = 12, LCM = 144

11) A man spends 60% of his salary. If he saves ₹8000, what is his total salary?

Solution:

Spent = 60% → Savings = 40%

40% of Salary = ₹8000

11) What is the probability of getting an odd number when rolling a dice?

Solution:

Odd numbers on dice: 1, 3, 5 → 3 outcomes

Total outcomes: 6

Probability= 3/6 =1/2

12) Who is the father of Mathematics?

Archimedes