Students can practice the best Class 7 Science MCQ and The World of Metals and Non metals Class 7 Science Curiosity Chapter 4 MCQ Online Test with Answers for exam preparation.
Class 7 Science Chapter 4 The World of Metals and Non metals MCQ
The World of Metals and Non metals MCQ Class 7
MCQ On The World of Metals and Non metals Class 7
Question 1.
Find the true properties of metals:
(a) Lustrous
(b) Hard/Soft
(c) Malleable
(d) All of these
Answer:
(d) All of these
Question 2.
Metals for basic oxides with oxygen generally are:
(a) Sodium
(b) Magnesium
(c) Zinc
(d) All of these
Answer:
(d) All of these
Question 3.
Non-metals form acidic oxides with oxygen:
(a) Sulfur
(b) Phosphorus
(c) Both (a) – (b)
(d) All of these
Answer:
(c) Both (a) – (b)
Question 4.
Oxides of non-metals are acidic in nature:
(a) Sulfur burns in air to form acidic oxide
(b) Phosphorus burns in air to form phosphorus pentexide
(c) Both (a) and (b) are true
(d) Both (a) and (b) are false
Answer:
(c) Both (a) and (b) are true
Question 5.
Metals are good conductors of:
(a) heat
(b) electricity
(c) Both (a) and (b)
(d) All of these
Answer:
(c) Both (a) and (b)
Question 6.
Which property allows metals like copper to be beaten into thin sheets?
(a) Ductility
(b) Sonority
(c) Malleability
(d) Conductivity
Answer:
(c) Malleability
Question 7.
Which of these metals is found in a liquid state at room temperature?
(a) Iron
(b) Mercury
(c) Aluminium
(d) Zinc
Answer:
(b) Mercury
Question 8.
The ability of a metal to be drawn into thin wires is called:
(a) Flexibility
(b) Brittleness
(c) Ductility
(d) Sonority
Answer:
(c) Ductility
Question 9.
Which non-metal is essential for respiration?
(a) Nitrogen
(b) Sulfur
(c) Oxygen
(d) Carbon
Answer:
(c) Oxygen
Question 10.
Which property of metals allows them to produce a ringing sound when struck?
(a) Conductivity
(b) Malleability
(c) Ductility
(d) Sonority
Answer:
(d) Sonority
Question 11.
What is the brown deposit that forms on iron objects when exposed to moist air called?
(a) Corrosion
(b) Oxidation
(c) Rust
(d) Tarnish
Answer:
(c) Rust
Question 12.
Which of the following materials is a good conductor of heat?
(a) Wood
(b) Plastic
(c) Iron
(d) Coal
Answer:
(b) Plastic
Question 13.
Which of the following is used to prevent rusting of iron?
(a) Painting
(b) Heating
(c) Freezing
(d) Wetting
Answer:
(a) Painting
Question 14.
Which oxide turns red litmus paper blue?
(a) Sulfur oxide
(b) Magnesium oxide
(c) Carbon dioxide
(d) Chlorine oxide
Answer:
(b) Magnesium oxide
Question 15.
What is the nature of non-metal oxides like sulfur dioxide?
(a) Basic
(b) Acidic
(c) Neutral
(d) Salty
Answer:
(b) Acidic
Question 16.
What protects electricians from electric shocks?
(a) Metal gloves
(b) Bare hands
(c) Rubber gloves
(d) Iron rods
Answer:
(c) Rubber gloves
Question 17.
Why is sodium stored in kerosene?
(a) It is shiny
(b) It reacts with moisture and air
(c) It has high density
(d) It melts easily
Answer:
(b) It reacts with moisture and air
Question 18.
What is the green coating on copper objects due to?
(a) Oxidation
(b) Painting
(c) Rusting
(d) Tinning
Answer:
(a) Oxidation
Question 19.
Which element is used in antiseptic solutions for wounds?
(a) Nitrogen
(b) Iodine
(c) Hydrogen
(d) Carbon
Answer:
(b) Iodine
Question 20.
Why are metal wires used in musical instruments?
(a) They are brittle
(b) They are elastic
(c) They are ductile
(d) They are rough
Answer:
(c) They are ductile
Question 21.
What happens when sulfur burns in air?
(a) Forms a basic oxide
(b) Forms an acidic oxide
(c) Forms water
(d) Forms metal
Answer:
(b) Forms an acidic oxide
Question 22.
Which of the following is a non-metal used in fertilizers?
(a) Nitrogen
(b) Aluminium
(c) Zinc
(d) Copper
Answer:
(a) Nitrogen
Question 23.
What makes aluminium suitable for food wrapping?
(a) It is expensive
(b) It is brittle
(c) It is malleable
(d) It is non-metallic
Answer:
(c) It is malleable
Question 24.
Which property is exhibited by metal objects like bells?
(a) Brittleness
(b) Sonority
(c) Dullness
(d) Rigidity
Answer:
(b) Sonority
Question 25.
Which one is NOT a property of metals?
(a) Malleability
(b) Ductility
(c) Poor conductor of electricity
(d) Lustre
Answer:
(c) Poor conductor of electricity
The World of Metals and Non metals Class 7 Assertion Reason Questions
Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R).
(a) Both (A) and (R) are true and (R) is correct explanation of (A).
(b) Both (A) and (R) are true and (R) is not correct explanation of (A).
(c) (A) is true but (R) is false.
(d) (A) is false but (R) is true.
1. Assertion (A): Metals are hard but non-metals are not hard as metals are.
Reason (R): Copper and iron are lustrous but wood and sulfur are non-lustrous at all.
Answer:
(a) Both (A) and (R) are true and (R) is correct explanation of (A).
2. Assertion (A): Gold is most ductile metal.
Reason (R): Ductility is the ability to be drawn into thin wires.
Answer:
(a) Both (A) and (R) are true and (R) is correct explanation of (A).
3. Assertion (A): The sulfur burn in the air.
Reason (R): It is ductile and sonorous.
Answer:
(c) (A) is true but (R) is false.
4. Assertion (A): Non-metals form acidic oxides.
Reason (R): Non-metals oxides turn blue litmus paper red.
Answer:
(b) Both (A) and (R) are true and (R) is not correct explanation of (A).
5. Assertion (A): Sodium is stored in kerosene oil.
Reason (R): Sodium reacts very slowly with oxygen and water.
Answer:
(c) (A) is true but (R) is false.
The World of Metals and Non metals Class 7 Fill in the Blanks
1. Copper iron and aluminium are _______ in appearance.
Answer:
lustrous
2. Metals sodium and potassium are _______.
Answer:
soft
3. _______ metal is found in liquid state at room temperature.
Answer:
Mercury
4. _______ are beaten into sheets.
Answer:
Silver and Aluminium
5. The steel is a mixture of iron and _______.
Answer:
carbon
6. Metal spoon and a metal coin produce _______ sound.
Answer:
ringing
7. _______ is done to prevent formation of rust on metals.
Answer:
Galvanisation
8. Magnesium oxide changes red litmus paper to _______.
Answer:
blue
9. Oxygen, nitrogen and _______ are nonmetals.
Answer:
hydrogen
10. _______ (a special metal) is used in atomic energy.
Answer:
Zirconium
The World of Metals and Non metals Class 7 True or False
1. Sulfur, coal, wood are lustrous.
Answer: False
2. Thin silver foil is used to cover sweets.
Answer: True
3. A piece of coal is not brittle.
Answer: False
4. The plastic is poor conductor of electricity.
Answer: True
5. The oxides of non-metals are basic in nature.
Answer: False
6. The elements into two groups as metals and non-metals.
Answer: True
7. We use oxygen for water purification.
Answer: False
8. Some metals such as iron and aluminium are recycled to lesson wastes.
Answer: True
9. Non-metals react with water mostly.
Answer: False
10. We used metals as well as the non-metals in our everyday life.
Answer: True