NET Mathematics MCQs

After a 20% increase, the quantity becomes 120% of the original.
The required reduction is 20/120 × 100 = 16⅔%.

Convert each value to decimals: 5/8 = 0.625, 0.60 = 0.60, 59% = 0.59, and 3/5 = 0.60.
Therefore, 5/8 is the greatest.

Multiply 2 × 3 = 6 and count three decimal places in total.
The product is 0.006.

The square root is the number whose square equals 196.
Since 14 × 14 = 196, the answer is 14.

The decrease is Rs. 75.
The percentage decrease is 75/500 × 100 = 15%.

The cube root is the number that gives 729 when cubed.
Since 9³ = 729, the answer is 9.

The sequence increases by 3 each time.
Adding 3 to 11 gives 14.

The sum of the first n natural numbers is n(n + 1)/2.
For n = 10, the sum is 10 × 11 ÷ 2 = 55.

The sum of the first n odd numbers equals n².
For n = 8, the sum is 8² = 64.

The least common multiple of 3 and 4 is 12.
A number divisible by both must therefore be divisible by 12.

The units digits of powers of 7 cycle as 7, 9, 3, 1.
The fourth power therefore ends in 1.

The greatest common divisor of 18 and 24 is 6.
Dividing both terms by 6 gives 3/4.