Practice Section 1 question answer pdf - general science mcq Online Quiz (set-1) For All Competitive Exams

Q-1)   How many different isomers are possible for a hydrocarbon with the molecular formula C4H10?

(a)

(b)

(c)

(d)


Q-2)   Which of the following has maximum density?

(a)

(b)

(c)

(d)


Q-3)   The prerequisites for biotechnological production of antibiotics is
  1. to search an antibiotic producing micro-organism
  2. to isolate the antibiotic gene
  3. to join antibiotic gene with E.coli plasmid

(a)

(b)

(c)

(d)


Q-4)   Organic compounds will always contain

(a)

(b)

(c)

(d)


Q-5)   Match List-I with List-II :
List-I List-II
A. Sour milk 1. Malic acid
B. Vinegar and pickle 2. Carbonic acid
C. Soda water 3. Acetic acid
D. Apple 4. Lactic acid
Select the correct answer from the codes given below: (A) (B) (C) (D)

(a)

(b)

(c)

(d)

Explanation:

  1. Sour milk – Lactic acid
  2. Vinegar and pickel – Acetic acid
  3. Soda water – Carbonic acid
  4. Apple – Malic acid


Q-6)   Which of the following are examples of addition polymers?
  1. Polystyrene
  2. Nylon
  3. PVC
  4. Polypropylene
Choose the correct option from the codes given below:

(a)

(b)

(c)

(d)

Explanation:

Nylon is a condensation polymer.


Q-7)   Which of the following are true statements?
  1. α-Carbon of α-amino acid is asymmetric.
  2. All proteins are found in L-form.
  3. Human body can synthesize all proteins they need.
  4. At pH = 7 both amino and carboxylic groups exist in ionised form.

(a)

(b)

(c)

(d)

Explanation:

All proteins are not found in L-form but they may be present in form of D or L


Q-8)   The heteroatoms present in CH3 — CH2 — O — CH2— CH2 Cl are
  1. Oxygen
  2. Carbon
  3. Hydrogen
  4. Chlorine

(a)

(b)

(c)

(d)

Explanation:


Q-9)   Gas welding used for welding broken pieces of iron, we normally use a mixture of :

(a)

(b)

(c)

(d)


Q-10)   Pentane has the molecular formula C5H12. It has

(a)

(b)

(c)

(d)

Explanation:

i.e., 16 covalent bonds.