Practice Chemistry test online - general science mcq Online Quiz (set-1) For All Competitive Exams
Q-1) Scurvy is caused due to the deficiency of vitamin
(a)
(b)
(c)
(d)
Scurvy (bleeding of gums) is caused due to deficiency of vitamin ‘C’ (ascorbic acid).
Q-2) Which one of the following is not present in cement?
(a)
(b)
(c)
(d)
Gypsum is added in calculated quantity in order to adjust the rate of setting of cement. Alum is NOT present in cement.
Q-3) Glass is a transparent substance obtained by heating silica with oxides or carbonates of metals. Glass is a mixture of
(a)
(b)
(c)
(d)
Q-4) Which one among the following is the main ingredient in cement?
(a)
(b)
(c)
(d)
The composition of cement is CaO (lime) or limestone 62%, silica (SiO2) 22%, alumina (Al2O3) 7.5%, magnesia (MgO) 2.5%, etc.
Thus, limestone is the major raw material for cement.
Q-5) Consider the following statements- Soap cannot be used in acidic water.
- Ionic part of a soap is —COO– · Na+ .
- Soap dissolves in water faster then detergent.
Which of the statements given above is/are correct?
(a)
(b)
(c)
(d)
Detergent dissolves in water faster than soap.
Q-6) Potash (Potassium carbonate) is used as a fertilizer. It is also known as
(a)
(b)
(c)
(d)
Q-7) The principle of cleaning by soap is
(a)
(b)
(c)
(d)
Soaps form surface films, reduce surface tension of solution and help in removing dirt and dust by emulsifying grease.
Q-8) Night-blindness is caused due to the deficiency of
(a)
(b)
(c)
(d)
Night-blindness is caused due to the deficiency of vitamin A.
Q-9) Which of the statements about glass are correct?- Glass is a super-cooled liquid having infinite viscosity.
- Violet coloured glass is obtained by adding MnO2 .
- Glass is a man-made silicate.
- Glass is a crystalline substance.
Select the correct answer using the codes given below.
(a)
(b)
(c)
(d)
Glass is an amorphous substance.
Q-10) Which one of the following contains cobalt ?
(a)
(b)
(c)
(d)
Vitamin B12 (Cyanocobalamines): Cobalamine has by far the most complicated structure of all the vitamins.
It has a cobalt atom in the centre. It also has – CN groups in its structure.
It is a pink-coloured crystalline, water soluble vitamin.
Q-11) Which one of the following is a vitamin?
(a)
(b)
(c)
(d)
Vitamin C is chemically ascorbic acid.
Q-12) Deficiency of vitamin A results in
(a)
(b)
(c)
(d)
In childhood, lack of vitamin A retards growth and hence like other vitamins, it is also said to be a growth-promoting factor.
In mild deficiency, it leads to night blindness. Its prolonged deficiency leads to xerophthalmia.
Q-13) The aqueous solution of one of the following vitamins is dark in colour
(a)
(b)
(c)
(d)
The aqueous solution of vitamin B12 is dark in colour.
Q-14) Which one of the following correctly defines the state of glass?
(a)
(b)
(c)
(d)
Glass is an amorphous, hard, brittle, super cooled liquid.
Q-15) Washing soaps are potassium and sodium salts of
(a)
(b)
(c)
(d)
Q-16) Washing soap can be prepared by saponification with alkali of which of the following oil
(a)
(b)
(c)
(d)
Any oils which are good for eating or cooking, can be used in making soap. One of the best is said to be Coconut oil. Groundnut, shea butter, cocoa butter, sun flower and many other vegetable oils are also used.
Q-17) Alkaline hydrolysis of esters is known as
(a)
(b)
(c)
(d)
Alkaline hydrolysis of esters is known as saponification.
$\text"R - COOR' + NaOH ⟶ R 'OH + RCOONa"$
Q-18) Soaps are sodium salts of fatty acids. Which of the following fatty acid does not form soap?
(a)
(b)
(c)
(d)
Q-19) Given below is an approximate composition of a substance :
- CaO - 60-70%,
- SiO2 - 20-25%,
- Al2O3 - 5-10%,
- Fe2O3 - 2-3%
The substance is
(a)
(b)
(c)
(d)
Cement is made up of calcium oxide, silicon dioxide, aluminium tetra oxide and iron tetra oxide.
Q-20) The major component used in preparation of different types of glasses is
(a)
(b)
(c)
(d)
The major component used in the preparation of different types of glasses is silica.