Category: Everyday Science MCQs

Telephone was invented in 1876 in America by:

(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

Which one of the following is an alkali?

(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

The temperature of liquid Nitrogen is:

(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

Boiling of an egg is a change which is:

(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