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CTET Paper I (Classes I to V) Feb 2015 Solved Paper

Question : 56 of 150

Marks: +1, -0

Which of the following is not correct ?

2 kg 30 g is the same as 2030 g
$8 litres 80 millilitres = 380 millilitres$
Area of a square of side 10 cm = Area of the rectangle of length 100 cm and breadth 0.01 m
$3 hours 14 minutes = 194 minutes$

Solution:

Concept:

Conversion between units:

1 \text{ kg} = 1000 \text{ g}

1 \text{ litre} = 1000 \text{ mL}

1 \text{ m} = 100 \text{ cm}

, and area of square

= \text{side}^2

, area of rectangle

= \text{length} \times \text{breadth}

Explanation:

Check each statement.

2 \text{ kg } 30 \text{ g} = (2 \times 1000 + 30) \text{ g} = 2030 \text{ g}

. Correct.

8 \text{ litres } 80 \text{ mL} = (8 \times 1000 + 80) \text{ mL} = 8080 \text{ mL}

, not

380 \text{ mL}

. So B is wrong.

C: Square area

= (10 \text{ cm})^2 = 100 \text{ cm}^2

. Rectangle: length

100 \text{ cm}

, breadth

0.01 \text{ m} = 1 \text{ cm}

. Area

= 100 \times 1 = 100 \text{ cm}^2

. Both equal. Correct.

3 \text{ hours } 14 \text{ min} = (3 \times 60 + 14) \text{ min} = 194 \text{ min}

. Correct.

Only option B is incorrect.

Answer:

Option B is not correct.

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