CTET CTET Math 5

Question 1

Which of the following is an irrational number?

Accepted Answer

√50

Answer

√50 = 5√2, which cannot be expressed as p/q, so it is irrational.

Question 2

The speed of a boat in still water is 12 km/h and the speed of the stream is 4 km/h. Time taken to go 48 km downstream is:

Accepted Answer

3 h

Answer

Downstream speed = 12 + 4 = 16 km/h; time = 48/16 = 3 hours.

Question 3

In a bar graph, if the scale is 1 cm = 50 units and a bar is 3.5 cm tall, what value does it represent?

Accepted Answer

175

Answer

Value = 3.5 × 50 = 175 units.

Question 4

The LCM of two numbers is 120 and their HCF is 10. If one number is 40, the other number is:

Accepted Answer

30

Answer

Product of numbers = LCM × HCF = 1200; other number = 1200/40 = 30.

Question 5

A student says '2 + 3 × 4 = 20'. This reflects a misconception about:

Accepted Answer

Order of operations (BODMAS)

Answer

The student added before multiplying, violating BODMAS where multiplication precedes addition.

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