Question : The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
I have a dog and a cow. / A dog is black / but the cow is / black and white.

Option 1: A dog is black

Option 2: black and white

Option 3: but the cow is

Option 4: I have a dog and a cow

Question : Potato is an example of _______.

Option 1: tuber

Option 2: bulb

Option 3: cromes

Option 4: rhizome

Question : Which of the following is not an example of an amphibian?

Option 1: Frog

Option 2: Sea horse

Option 3: Salamander

Option 4: Toad

Question : An example of an equality relation of two expressions in $x$. Which is not an identity, is:

Option 1: $(x+3)^{2}=x^{2}+6x+9$

Option 2: $(x+2y)^{3}=x^{3}+8y^{3}+6xy(x+2y)$

Option 3: $(x+2)^{2}=x^{2}+2x+4$

Option 4: $(x+3)(x–3)=x^{2}–9$

Question : What is the ratio of inradius and circumradius of an equilateral triangle?

Option 1: 1 : 2

Option 2: 1 : 3

Option 3: 1 : 4

Option 4: 3 : 2