Lakhmir Singh and Manjit Kaur ICSE Class 6 Chemistry Chapter 1 Introduction to Chemistry
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Board |
ICSE |
Class |
6 |
Subject |
Chemistry |
Chapter |
1 |
Chapter Name |
Introduction to Chemistry |
Author |
Lakhmir Singh and Manjit Kaur |
(A) Choose the correct option:
(1) Which of the following protects our skin from harmful sunrays?
(a) Sunscreen
(b) Moisturizer
(c) Neem
(d) Talcum Powder
Ans:- (a) Sunscreen
(2) Who developed the atomic theory of matter?
(a) Robert Boyle
(b) John Dalton
(c) Antoine Lavoisier
(d) Sir Humphrey Davy
Ans:- (b) John Dalton
(3) Soaps are made up of –
(a) limestone and Soda
(b) Sodium carbonate and Silica
(c) Sodium and Potassium Salts
(d) Calcium Sulphate and Salts
Ans:- (c) Sodium and Potassium Salts
(4) Which of the following is manufactured by heating a mixture of gypsum, limestone and clay in a rotary kiln?
(a) Cement
(b) Glass
(c) Plaster of Paris
(d) Plastics
Ans:- (a) Cement
(5) Which of the following is used un Soda – lime glass?
(a) Calcium sulphate and salts
(b) Limestone and soda
(c) Sodium carbonate and Silica
(d) Sodium and Potassium Salts
Ans:- (c) Sodium carbonate and Silica
(6) Which one of these are the qualities of silicones?
(a) They have high melting point
(b) They have high boiling point
(c) They are resistant to heat and water
(d) All of these
Ans:- (d) All of these
(7) Which one of these are paints with high – gloss oil?
(a) Enamels
(b) Dyes
(c) Silicones
(d) None of these
Ans:- (a) Enamels
(8) Who developed the “law of conservation of mass”?
(a) Sir Humphry Davy
(b) Berzelius
(c) Dmitri Mendeleev
(d) Antoine Lavoisier
Ans:- (d) Antoine Lavoisier
(9) Which of the following food preservation method involves making the food into salt solution?
(a) Fermentation
(b) Pickling
(c) Freezing
(d) Drying
Ans:- (b) Pickling
(10) Which of the following is a fertiliser?
(a) Urea
(b) Calcium nitrate
(c) Potassium Chloride
(d) All of these
Ans:- (b) Pickling
(11) Which of the following is a semi – synthetic fibre?
(a) Nylon
(b) Terrycot
(c) Terylene
(d) both b and c
Ans:- (d) both b and c
(12) Paracetamol is used as –
(a) analgesic
(b) antibiotic
(c) antipyretic
(d) Both a and c
(13) Which of the following type of glass is used in making spectacles and cameras?
(a) Pyrex glass
(b) Safety glass
(c) Photo chromatic glass
(d) Potash glass
Ans:- (c) Photo chromatic glass
(14) Which of the following is a thermosetting plastic?
(a) Bakelite
(b) Nylon
(c) Teflon
(d) PVC
Ans:- (a) Bakelite
(15) Which of the following is an application of silicones?
(a) In making bake ware and cookware
(b) In cosmetics
(c) In construction
(d) All of these
Ans:- (a) In making bake ware and cookware
(B) Fill in the blanks:
(1) Carbohydrate are mainly starch or sugars which are main energy sources for our
(2) Plastic is a synthetic material made from a wide range of Polymash
(3) Plaster of Paris is manufactured by heating calcium sulphate dehydrate (CaSO4.2H2O) 120° Celcius
(4) Silicones are substances made up with the combination of silicon and chemicals.
(5) Renicillu is one of the best – known antibiotics invented by Alexander Fleming, used to treat bacterial infections.
(6) Marie curie coined the term ‘radioactivity’.
(7) Terylene is manufactured from ethylene glycol and terephthalic acid.
(8) Alizarin red is a Chemical.
(9) Oil soluble paints are mixed with turpentine while applying.
(10) Glass is made up to limestone
(11) Tincture of iodine is an Antis.
(12) Malathion and copper sulphate are some commonly used Pesticides.
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(C) Write T for true and F for false statements.
(1) Prafulla Chandra Ray was the founder of India’s first pharmaceutical company. (T)
(2) Minerals are complex Organic Compounds. (F)
(3) Chemical dyes are alizarin red and indigo blue. (T)
(4) Plaster of Paris (POP) is formed by heating gypsum. (T)
(5) Antacids are used to neutralize the excess acid produced in the stomach. (T)
(6) Dmitri Mandeleev came up with the first periodic table of the elements. (T)
(7) Alchemists discovered hydrogen and oxygen elements. (F)
(8) Foaming cosmetics, such as shower gel and shampoo have sodium lauryl sulphate. (T)
(9) Vinegar is used for preservation of pickles and sauces. (F)
(10) Fertilisers make the soil fertile by adding essential elements the soil. (T)