Objective Type Questions

Question 1

Fill in the blanks:

(a) Chemistry deals with the study of matter and the changes it undergoes.

(b) Fertilizers help to increase the production of food.

(c) Food items like jams and pickles are protected by using preservatives (salt and sugar).

(d) L.P.G. is used for fuel.

(e) Inert gases were discovered by William Ramsay. 

Question 2.

Match the following words in column A with those in column B: 

Column A                                                                              Column B

1. Clothing                                                                                nylon, wool
2. Green Revolution                                                            agriculture
3. Building Materials mortar,                                          cement
4. Commodities of daily use Tooth paste,               cosmetic

Question 3.

Write “True” or “False” against each of the following statements. 

(a) Chemistry plays an important role in national economy: True

(b) Antibiotics are used as preservatives: False

(c) D.D.T. is an important fertiliser: False

(d) Gunpowder is an insecticide: False

(e) Enzymes secreted by our body are chemicals: True 

Question 4.

Choose the correct alternative from the choices given below for the following statements:

(a) Trinitrotoluene is used as 

1. A preservative
2. A fertiliser
3. A fuel
4. An explosive 

(b) Which one of the following is a pesticide? 

1. benzoic acid
2. Aldrin
3. Sugar
4. Gunpowder 

(c) Mortar is used as a 

1. Plastic material
2. A building material
3. An insecticide
4. As medicine 

(d) Used is an important 

1. Fuel
2. Preservative
3. Fertiliser
4. Food item 

(e) The chemicals prescribed by a doctor in treatment of infectious diseases are called 

1. Antigens
2. Lotions
3. Antibiotics
4. Creams 

Question 5.

Match the following scientists in column A with their discoveries or contributions in column B. 

Column A                                                 Column B

1. Marie Curie                                              Noble Prize Winner
2. John Dalton                                              Atomic theory
3. William Ramsay                                     Helium
4. Sir Humphry Davy                                Safety Lamp