ExamVeda
Login
Home
11
Which of the following is the first man made plastic that is bad conductor of heat?
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
12
Which of the following statements about vitamins are correct?
1. Vitaminc C is essential to make connective tissue in body.
2. Vitamin D is needed for synthesis of eye pigment.
3. Vitamin B12 helps in maturation of RBC.
4. Vitamin-C is required to make use of calcium absorbed from the intestine.
Select the correct answer:
Discuss
Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
13
Teflan is used in cooking equipment in a nonstick coating, used in the electronic industry due to its insulation characteristic in wiring etc., is a polymer containing carbon . . . . . . . . bonding is involved.
Discuss
Answer & Solution
Answer: Option B
Solution:
Teflon, a common material in non-stick cookware and electronics, is a special type of plastic called a polymer.
It's made of many small units linked together, like a chain.
These small units contain carbon atoms.
What makes Teflon special is the type of bond between these carbon atoms and another element.
The question asks about this other element and the type of bond it forms with carbon.
Option A: chloride - Chlorine can bond with carbon, but it doesn't form Teflon.
Option B: fluoride - This is the correct answer! Teflon is actually polytetrafluoroethylene, which means it has many carbon-fluorine bonds.
Option C: bromide - Bromine can also bond with carbon, but it doesn't create Teflon.
Option D: iodide - Iodine can bond with carbon, but it's not the element that makes up Teflon.
Therefore, the special bond in Teflon is a carbon-fluoride bond.
14
Which one of the following polymer are used for making bulletproof materials?
1. Kevlar
2. Glypal
3. Lexan
Select the correct answer:
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
15
Which of the following is an example of a non-cellulosic fibre?
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
16
Which one of the following statements regarding starch and cellulose is not correct?
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
17
Which one of the following polymers is made of proteins?
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
18
Enzymes
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
19
Match the following columns.
Column I Column II
a. Gypsum 1. Prevent UV rays
b. Nylon 2. Non stick utensils coating
c. Teflon 3. Textile fabrics
d. Crookes glass 4. Cement
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
20
Teflon is a polymer of which of the following monomers?
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board