(A) Marconi
(B) Galileo
(C) John Beard
(D) Graham Bell
Q. Who invented the first mechanical computer in the early 19th century?
(A) Marconi
(B) Galileo
(C) Charles Babbage
(D) Edison
Q. Charles Babbage is considered the, Father of :
(A) Computer
(B) Technology
(C) Maths
(D) None of these
Answers:
1. (D) Graham Bell
2. (C) Charles Babbage
3. (A) Computer
(A) Water
(B) Vinegar
(C) Lemon juice
(D) Slaked lime
Q. What is the chemical name of Slaked lime?
(A) Calcium Hydroxide
(B) Calcium Carbonate
(C) Calcium Dioxide
(D) None of these
Q. What is the chemical formula of Slaked lime?
(A) CaCl2
(B) Ca(OH)2
(C) CaCO2
(D) None of these
Answers:
1. (D) Slaked lime
2. (A) Calcium Hydroxide
3. (B) Ca(OH)2
(A) -32°C
(B) -80°C
(C) -100°C
(D) -196°C
Q. _______ is a cryogenic fluid that can cause rapid freezing on contact with living tissue.
(A) Liquid Nitrogen
(B) Liquid Air
(C) Liquid Hydrogen
(D) None of these
Q. What is the density of liquid air?
(A) 770 kg/m³
(B) 870 kg/m³
(C) 970 kg/m³
(D) None of these
Answers:
1. (D) -196°C
2. (A) Liquid Nitrogen
3. (B) 870 kg/m³
(A) Physical
(B) Chemical
(C) Physiological
(D) Morphological
Q. Rusting of iron is an example of:
(A) Absorption
(B) Adsorption
(C) Oxidation
(D) Reduction
Q. Mixing acid and base is a change which is:
(A) Physical
(B) Chemical
(C) Physiological
(D) Morphological
Answers:
1. (B) Chemical
2. (C) Oxidation
3. (B) Chemical
(A) Atoms
(B) Molecules
(C) Compounds
(D) Isotopes
Q. Who first gave the concept of ‘Atom’ ?
(A) Kapila
(B) Robert Edwards
(C) Kanada
(D) John Dalton
Q. Which of the following was the first organic compound to be synthesised in the laboratory?
(A) Citric acid
(B) Formic acid
(C) Lactose
(D) Urea
Answers:
1. (A) Atoms
2. (D) John Dalton
3. (D) Urea