MCQ Questions Archives

MCQ Questions for Class 9 Science Chapter 8 Motion with Answers

October 27, 2021July 18, 2020 by Kishen

MCQ Questions for Class 9 Science Chapter 8 Motion with Answers

MCQs from Class 9 Science Chapter 8 – Motion are provided here to help students prepare for their upcoming Science exam.

MCQs from CBSE Class 9 Science Chapter 8: Motion

1. If the displacement of an object is proportional to square of time, then the object moves with:
(a) Uniform velocity
(b) Uniform acceleration
(c) Increasing acceleration
(d) Decreasing acceleration

Answer/ Explanation

(b) Uniform acceleration

2. From the given v-t graph, it can be inferred that the object is

(a) At rest
(b) In uniform motion
(c) Moving with uniform acceleration
(d) In non-uniform motion

Answer/ Explanation

(b) In uniform motion

3. Suppose a boy is enjoying a ride on a marry-go-round which is moving with a constant speed of 10 m/s. It implies that the boy is:
(a) At rest
(b) Moving with no acceleration
(c) In accelerated motion
(d) Moving with uniform velocity

Answer/ Explanation

4. A particle is moving in a circular path of radius r.

The displacement after half a circle would be:
(a) Zero
(b) πr
(c) 2r
(d) 2πr

Answer/ Explanation

5. Which of the following can sometimes be ‘zero’ for a moving body?
i. Average velocity
ii. Distance travelled
iii. Average speed
iv. Displacement
(a) Only (i)
(b) (i) and (ii)
(c) (i) and (iv)
(d) Only (iv)

Answer/ Explanation

6. Which of the following statement is correct regarding velocity and speed of a moving body?
(a) Velocity of a moving body is always higher than its speed
(b) Speed of a moving body is always higher than its velocity
(c) Speed of a moving body is its velocity in a given direction
(d) Velocity of a moving body is its speed in a given direction

Answer/ Explanation

(d) Velocity of a moving body is its speed in a given direction

7. When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then the retardation will be:
(a) + 2 m/s²
(b) − 2 m/s²
(c) − 0.5 m/s²
(d) + 0.5 m/s²

Answer/ Explanation

(d) + 0.5 m/s²

8. The speed – time graph of a car is given here. Using the data in the graph calculate the total distance covered by the car.

(a) 1250 m
(b) 875 m
(c) 1500 m
(d) 870 m

Answer/ Explanation

(b) 875 m

9. A car of mass 1000 kg is moving with a velocity of 10 m/s. If the velocity-time graph for this car is a horizontal line parallel to the time axis, then the velocity of the car at the end of 25 s will be:
(a) 40 m/s
(b) 25 m/s
(c) 10 m/s
(d) 250 m/s

Answer/ Explanation

10. Which of the following is most likely not a case of uniform circular motion?
(a) Motion of the earth around the sun
(b) Motion of a toy train on a circular track
(c) Motion of a racing car on a circular track
(d) Motion of hours’ hand on the dial of a clock

Answer/ Explanation

11. In which of the following cases of motions, the distance moved and the magnitude of the displacement are equal?
i. If the car is moving on a straight road
ii. If the car is moving in circular path
iii. The pendulum is moving to and fro
iv. The earth is moving around the sun
(a) only(ii)
(b) (i) and (iii)
(c) (ii) and (iv)
(d) only (i)

Answer/ Explanation

(d) only (i)

12. A car is travelling at a speed of 90 km/h. Brakes are applied so as to produce a uniform acceleration of – 0.5 m/s². Find how far the car will go before it is brought to rest?
(a) 8100 m
(b) 900 m
(c) 625 m
(d) 620 m

Answer/ Explanation

13. In a free fall the velocity of a stone is increasing equally ion equal intervals of time under the effect of gravitational force of the earth. Then what can you say about the motion of this stone? Whether the stone is having:
(a) Uniform acceleration
(b) Non-uniform acceleration
(c) Retardation
(d) Constant speed

Answer/ Explanation

(a) Uniform acceleration

14. The numerical ratio of displacement to distance for a moving object is:
(a) Always less than 1
(b) Equal to 1 or less than 1
(c) Always more than 1
(d) Equal to 1 or more than one

Answer/ Explanation

(b) Equal to 1 or less than 1

15. Four cars A, B, C and D are moving on a levelled, straight road. Their distance time graphs are shown in the figure below. Which of the following is the correct statement regarding the motion of these cars?

(a) Car A is faster than car D
(b) Car B is the slowest
(c) Car D is faster than car C
(d) Car C is the slowest

Answer/ Explanation

(b) Car B is the slowest

MCQ Questions for Class 9 Science Chapter 7 Diversity in Living Organisms with Answers

October 27, 2021July 18, 2020 by Kishen

MCQ Questions for Class 9 Science Chapter 7 Diversity in Living Organisms with Answers

MCQs from Class 9 Science Chapter 7 – Diversity in Living Organisms are provided here to help students prepare for their upcoming Science exam.

MCQs from CBSE Class 9 Science Chapter 7: Diversity in Living Organisms

1. Fungus and algae both are placed under the same division “Thallophyta”.

What is the reason that both share the same group?
(a) Both are autotrophic
(b) Both are saprophytic
(c) Plant body in both is not differentiated into root, stem and leaves
(d) Both have false roots

Answer/ Explanation

2. Choose the option that best describes the characteristics of the kingdom to which the mushroom belongs:
(a) Unicellular prokaryotic organisms
(b) Saprophytic, eukaryotic, multicellular organisms
(c) Unicellular eukaryotic organisms
(d) Autotrophic eukaryotic organisms

Answer/ Explanation

(b) Saprophytic, eukaryotic, multicellular organisms

3. Given below is the figure of funaria– a moss plant.

Here theparts indicated by the letters A, B, C and D represent which of the followingstructures?
(a) A → foot; B → rhizoids; C → seta; D → capsule
(b) A → rhizoids; B → foot; C → seta; D→ capsule
(c) A → foot; B→ seta; C→ rhizoids; D → capsule
(d) A → rhizoids; B → seta; C → foot; D→ capsule

Answer/ Explanation

(b) A → rhizoids; B → foot; C → seta; D → capsule

4. Which of the following statement is incorrect?
(a) Aves are warm blooded, egg laying and have four four-chambered heart.
(b) Aves have feather covered body, fore limbs are modified as wing and breathe through lungs.
(c) Most of the mammals are viviparous.
(d) Fishes, amphibians and reptiles are oviparous.

Answer/ Explanation

(d) Fishes, amphibians and reptiles are oviparous.

5. The various species of organisms are grouped together on the basis of similarities and dissimilarities, which is known as the classification. It helps in an easy study of the organisms. Among the following which is not an advantage of classification of organisms?
(a) It helps to understand the interrelationship among the different groups of organisms.
(b) It helps to study the geographical distribution of the plants and animals.
(c) It helps to study the nuclear structure of the organisms.
(d) It depicts before us a picture of all the life forms at a glance.

Answer/ Explanation

6. Which of the following animals possesses a water vascular system?

(a) I
(b) II
(c) III
(d) IV

Answer/ Explanation

(a) I

7. Among the following choose the correct option that best describes the characteristics of spirogyra.
(a) Multicellular, auto trophic, root like rhizoids.
(b) Cytoplasmic strands, autotrophic, presence of rhizome.
(c) Presence of male cones, nonvascular, filaments.
(d) Filamentous, presence of Cytoplasmic strands, presence of pyrenoids.

Answer/ Explanation

(d) Filamentous, presence of Cytoplasmic strands, presence of pyrenoids.

8. Paramecium has tiny hair like projections all around the outside of their cell that give the paramecium locomotion and help the food to move in its oral cavity.

Can you choose the correct name for these locomotory organelles?
(a) Villi
(b) Cilia
(c) Oral groove
(d) Cytopyge

Answer/ Explanation

(b) Cilia

9. Angiospermae is a division of kingdom Plantae. The main characteristic feature of angiosperms is:
(a) Seeds are naked in fruits
(b) Seeds are covered with coats and are in fruits
(c) Fruits are without seeds
(d) Seeds are naked without fruits

Answer/ Explanation

(b) Seeds are covered with coats and are in fruits

10. The international Code of Biological Nomenclature provides the scientific nomenclature for every organism that consists of the genus name and the species name of the organism. Can you guess who introduced this system of binomial nomenclature of the organisms?
(a) Carolus Linnaeus
(b) Robert Hooke
(c) Robert Whittaker
(d) Ernst Haeckel

Answer/ Explanation

(a) Carolus Linnaeus

11. Which of the following have an open circulatory system?
(i) Arthropoda
(ii) Mollusca
(iii) Annelida
(iv) Cnidaria
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iv)
(d) (ii) and (iii)

Answer/ Explanation

(a) (i) and (ii)

12. Which among the following is a common feature of chrodates?
(a) Presence of notochord
(b) Presence of triploblastic condition
(c) Presence of coelom
(d) Presence of gill pouches

Answer/ Explanation

(a) Presence of notochord

13. Here alongside are shown the pictures of some reptiles.Among the following can you opt out the statement that does not Match of the characteristics of this family?

(a) Process of fertilization is internal in these organisms.
(b) Their eggs have a hard covering or shell.
(c) Their skin is dry and keratinised.
(d) They have three chambered heart.

Answer/ Explanation

(d) They have three chambered heart.

14. Four students P, Q, R and S were asked to do the labeling for the partsA, B, C, D and E of hydra shown in the figure alongside. They all submittedtheir answers as given below.

Which of the four students done the labelingcorrectly?
(a) Student P: A- Tentacle; B- Gastrodermis; C- Bud; D- Mouth; E- Young hydra.
(b) Student Q: A- Tentacle; B- Mouth; C- Gastrodermis; D- Young hydra; E- Bud.
(c) Student R: A- Young hydra; B- Mouth; C- Tentacle; D- Bud; E- Gastrodermis.
(d) Student S: A- Tentacle; B- Mouth; C- Young hydra; D- Bud; E- Gastrodermis.

Answer/ Explanation

(d) Student S: A- Tentacle; B- Mouth; C- Young hydra; D- Bud; E- Gastrodermis.

15. Which adaptation of the frog differentiates it from the fish?
(a) Ability to live in water also
(b) Lays eggs in water
(c) Have a streamlined body
(d) Presence of mucous glands in the skin

Answer/ Explanation

(a) Ability to live in water also

MCQ Questions for Class 9 Science Chapter 6 Tissues with Answers

October 27, 2021July 18, 2020 by Kishen

MCQ Questions for Class 9 Science Chapter 6 Tissues with Answers

MCQs from Class 9 Science Chapter 6 – Tissues are provided here to help students prepare for their upcoming Science exam.

MCQs from CBSE Class 9 Science Chapter 6: Tissues

1. Tissue is a group of similar kind of cells specialized to perform a particular function in the body. Therefore presence of tissues in a multicellular organism ensures:
(a) Faster development
(b) Division of labour
(c) Higher reproductive potential
(d) Body strength

Answer/ Explanation

(b) Division of labour

2. Given below is a diagram showing the structure of a neuron tissue.

Choose the correct labeling for the parts A, B, C, D and E.
(a) A – Nucleus; B – Cell body; C – Dendrite; D – Axon; E – Nerve ending.
(b) A – Nucleus; B – Dendrite; C – Cell body; D – Nerve ending; E – Axon.
(c) A – Nucleus; B – Axon; C – Cell body; D – Dendrite; E –Nerve ending.
(d) A – Nucleus; B – Dendrite; C – Cell body; D – Axon; E – Nerve ending

Answer/ Explanation

(d) A – Nucleus; B – Dendrite; C – Cell body; D – Axon; E – Nerve ending

3. Lysosome is a cytoplasmic organelle containingenzymesthat break down biological polymers. Lysosomes function as the digestive system of the cell. It is also called the suicide bag of the cell because:
(a) It causes any cell to commit suicide
(b) Its enzymes digest the cell itself
(c) Its enzymes kill surrounding cells
(d) All of the above

Answer/ Explanation

(b) Its enzymes digest the cell itself

4. While doing work and running, you move your organs like hands, legs, etc. Which among the following is correct?
(a) Smooth muscles contract and pull the ligament to move the bones
(b) Smooth muscles contract and pull the tendons to move the bones
(c) Skeletal muscles contract and pull the ligament to move the bones
(d) Skeletal muscles contract and pull the tendon to move the bones

Answer/ Explanation

(d) Skeletal muscles contract and pull the tendon to move the bones

5. Cardiac muscleis one of the three major types of muscles, the others being skeletal and smooth muscles. It is found in the walls and histological foundation of the heart. Which one of the following statements is not related to the cardiac muscles?
(a) They muscles show rhythmic contraction and relaxation throughout life.
(b) They do not work according to our will, so they are called involuntary muscles.
(c) They are non-striated, multinucleated and branched muscles.
(d) The contraction and relaxation of the heart muscles help to pump and distribute blood to different parts of the body.

Answer/ Explanation

6. In a test of biology a figure of smooth muscle labeled as A, B, C and D for different parts of the muscles. Four students P, Q, R and S in a way to attempt the question named the four parts as given below. But only one student could name all the four parts correctly.

Which of the following options is the answer written by that student?
(a) A – Intercalated disc; B – Sarcoplasm; C – Branched fibres; D – Nucleus
(b) A – Intercalated disc; B – Branched fibres; C – Sarcoplasm; D – Nucleus
(c) A – Branched fibres; B – Intercalated disc; C – Sarcoplasm; D – Nucleus
(d) A – Branched fibres; B – Sarcoplasm; C – Intercalated disc; D – Nucleus

Answer/ Explanation

(b) A – Intercalated disc; B – Branched fibres; C – Sarcoplasm; D – Nucleus

7. Which of the following statements is incorrect?
i. Parenchyma tissues have intercellular spaces.
ii. Collenchymatous tissues are irregularly thickened at corners.
iii. Apical and intercalary meristems are permanent tissues.
iv. Meristematic tissues, in its early stage, lack vacuoles.
(a) (i) and (ii)
(b) Only (iii)
(c) (iii) and (iv)
(d) Only (ii)

Answer/ Explanation

(b) Only (iii)

8. Xylemis the specializedtissue of the plants that transports water and nutrients from the soil to the upper parts like stems and leaves of plant and provides mechanical support to them. It is composed of four different types of the cells. Which of the following is not one a type of cell found in xylem tissues?
(a) Tracheids
(b) Vessels
(c) Xylem parenchyma
(d) Sieve tubes

Answer/ Explanation

(d) Sieve tubes

9. A person met with an accident in which two long bones of his hand were dislocated. Which among the following may be the possible reason for this?
(a) Tendon breaks
(b) Break of skeletal muscles tissue
(c) Ligament breaks
(d) Areoelar tissue breaks

Answer/ Explanation

10. Tiny pores are found on the surface of the leaves of plants. These pores are called stomata. These stomata surrounded by the kidney shaped guard cells provide many vital functions to the plants.

Which of the following functions is not served by the stomata for the plants?
(a) Exchange of gases, particularly CO2 and O2, with atmosphere
(b) Loss of water in the form of vapours during transpiration
(c) Helps to create pressure for the water to rise upward, by its process of transpiration
(d) Helps the leaves to carry out the process of photosynthesis

Answer/ Explanation

(d) Helps the leaves to carry out the process of photosynthesis

11. Epithelial tissue always has an exposed outer surface and an inner surface anchored to connective tissue by a thin, non- cellular structure called the
(a) Nonstratified layer
(b) Stratified layer
(c) Basement membrane
(d) Fibroblast

Answer/ Explanation

12. Meristemetic tissues are those which help in increasing the length and girth of the plan. Which of the following statements given below is correct about the meristematic tissue?
(a) It is made up of cells that are incapable of cell division
(b) It is made up of cells that are capable of cell division
(c) It is composed of single type of cells
(d) It is composed of more than one type of cells

Answer/ Explanation

(b) It is made up of cells that are capable of cell division

13. Connective tissues are the tissues that help to bind or connect other tissues in the body. They have widely spaced cells embedded in a matrix having a variety of proteins, polysaccharides and mineral salts. Can you identify the connective tissues among the following?
i. Ligament
ii. Epithelium
iii. Tendon
iv. Blood
(a) Both (i) and (iii)
(b) (i), (ii) and (iii)
(c) (i), (iii) and (iv)
(d) All (i), (ii), (iii) and (iv)

Answer/ Explanation

14. Simple epithelium is a tissue, which form the outer protective layer of the skin of the animal body, is composed of cells which are
(a) Hardened and provide support to organs
(b) Continuously diving to provide to form an organ
(c) Cemented directly to one another to form an irregular layer
(d) Loosely connected to one another to form an irregular layer

Answer/ Explanation

15. If the tip of the sugarcane plant is removed from the field, even then it keeps on growing in length. It is due to the presence of:
(a) Cambium
(b) Apical meristem
(c) Lateral meristem
(d) Intercalary meristem

Answer/ Explanation

(d) Intercalary meristem

MCQ Questions for Class 9 Science Chapter 5 The Fundamental Unit of Life with Answers

October 27, 2021July 18, 2020 by Kishen

MCQ Questions for Class 9 Science Chapter 5 The Fundamental Unit of Life with Answers

MCQs from Class 9 Science Chapter 5 – The Fundamental Unit of Life are provided here to help students prepare for their upcoming Science exam.

MCQs from CBSE Class 9 Science Chapter 5: The Fundamental Unit of Life

1. A cell will swell up if
(a) The concentration of water molecules in the cell is higher than the concentration of water molecules in the surrounding medium.
(b) The concentration of water molecules in the surrounding medium is higher than the concentration of water molecules in the cell.
(c) The concentration of water molecules is same in the cell and in the surrounding medium
(d) The concentration of water molecules does not matter.

Answer/ Explanation

(b) The concentration of water molecules in the surrounding medium is higher than the concentration of water molecules in the cell.

2. Which of the following statement marks as a difference between plant cell and animal cell?
(a) Plant cells have cell wall which animal cells do not.
(b) Plant cells do not have vacuole while animal cells do have.
(c) Plant cells have only cell membrane while animal cells have both cell wall as well as cell membrane.
(d) Plant cells have more plastids while animal cells have few plastids.

Answer/ Explanation

3. Endoplasmic reticulum one of the cell organelles, exists as a membranous network that extends from outer membrane of nucleus to the plasma membrane making a connection between them.

Which of the following statements is not related to the endoplasmic reticulum?
(a) It behaves as transport channel for proteins between nucleus and cytoplasm.
(b) It transports materials between various regions in cytoplasm.
(c) It can be the site of energy generation.
(d) It can be the site of some biochemical activities of the cell.

Answer/ Explanation

4. Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one. Can you pick out the option among the following which does not belong to this process?
(a) The movement of water across a semipermeable membrane is affected by the amount of substances dissolved in it.
(b) Membranes are made of organic molecules such as proteins and lipids.
(c) Molecules soluble in organic solvents can easily pass through the membrane.
(d) Plasma membranes contain chitin sugar in plants.

Answer/ Explanation

(d) Plasma membranes contain chitin sugar in plants.

5. The nucleus controls all the activities of the cell and acts as a site of DNA material and protein synthesis. It is composed of some components which all together give the nucleus its functionality. Here is shown a figure of nucleus with some of its components labeled as A, B, C and D. can you name these components correctly?

(a) A – Nucleons; B – Chromatin; C – Nuclear membrane; D – Nucleoplasm
(b) A – Nucleus; B – Chromatin; C – Nuclear membrane; D – Nucleoplasm
(c) A – Nucleolus; B – Chromatin; C – Nuclear membrane; D – Nucleoplasm
(d) A – Nucleolus; B – Chromatin; C – Nuclear membrane; D – Nuclear wall

Answer/ Explanation

6. You must have observed that a fruit when unripe is green but it becomes beautifully coloured when ripe. According to you what is the reason behind this colour change.
(a) Chloroplasts change to chromosplasts
(b) Chromosplasts change to chromosomes
(c) Chloroplasts change to chromosomes
(d) Chromosplasts change to chloroplasts

Answer/ Explanation

(a) Chloroplasts change to chromosplasts

7. Rahul’s mother was going to make pickle. For this she cut the vegetables into small pieces and put them in the sun for few hours. Rahul was observing all her activities very curiously and asked his mother if why she had put the salted vegetables in the sun. among the following what might be the most appropriate answer for his question?
(a) So that the pickle may get extra flavour.
(b) So that the cut vegetables may absorb the vitamin d as a nutrient from the sun rays.
(c) So that the vegetables may lose all the water by diffusion and evaporation and become dry.
(d) So that the salt may get evenly and properly absorbed by the vegetables.

Answer/ Explanation

8. The process of plasmolysis in plant cell is defined as:
(a) Breakdown of plasma membrane in hypotonic solution.
(b) Shrinkage of cytoplasm in hypertonic medium.
(c) Shrinkage of Nucleoplasm.
(d) None of these.

Answer/ Explanation

(b) Shrinkage of cytoplasm in hypertonic medium.

9. Mitochondria are the sites of respiration in the cell. They oxidize carbohydrates and fats present in the cell to produce carbon dioxide, water and a lot of energy. The energy so released is stored in the form of ATP molecules. Since mitochondria in the cell are used to synthesize energy so, they are also called:
(a) Energy currency of the cell
(b) Energy generator of the cell
(c) Kitchen of the cell
(d) Power house of the cell

Answer/ Explanation

(d) Power house of the cell

10. Cell is the structural and functional unit of life. The word cell is derived from the Latin word ‘cellula’ which means “a little room”. Can you name the scientist who coined the term cell?
(a) Robert Hooke
(b) Anton Von Leeuwenhoek
(c) Robert Brown
(d) Ernst Haeckel

Answer/ Explanation

(a) Robert Hooke

11. In a test, a teacher collected the answers written by four students as the definition of osmosis as given below. Read carefully and select the correct one.
(a) Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane.
(b) Movement of solvent molecules from its higher concentration to lower concentration.
(c) Movement of solvent molecules from higher concentration to lower of solution through a permeable membrane.
(d) Movement of solute molecules from lower concentration to higher concentration of solution through a semipermeable membrane.

Answer/ Explanation

(a) Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane.

12. Among the following statements which one is incorrect?
(a) Golgi apparatus is involved with formation of lysosomes.
(b) Nucleus, mitochondria and plastid have DNA, hence they are able to make their own structural proteins.
(c) Lysosomes are called the suicide bags as they eat up their own cells.
(d) Cytoplasm is called known as protoplasm.

Answer/ Explanation

(d) Cytoplasm is called known as protoplasm.

13. Anjali wanted to eat rice and kidney bean (rajmah). She requested her mother to cook the same on next day. At night her mother took a cup of kidney beans and put them in a container having some water and the kept the container covered overnight. Next day it was observed that the kidney beans got swollen and were ready to be cooked. What is this phenomenon due to which kidney beans got swollen is known as?
(i) Osmosis
(ii) Diffusion
(iii) Endosmosis
(iv) Exosmosis
Choose the correct option among the following:
(a) Only (iii)
(b) Both (i) and (iii)
(c) Both (i) and (iv)
(d) Only (i)

Answer/ Explanation

(b) Both (i) and (iii)

14. A vacuole is a space or cavity within the cytoplasm of a cell, enclosed by a membrane and typically containing fluid. They are a kind of storage sacs that are very large sized in plant cell as compared to that in the animal cell.

Which among the following is not a function of the vacuole?
(a) They help to store the toxic metabolic by-products of the plant cell.
(b) They provide turgidity and rigidity to the plant cell.
(c) They help to maintain the osmotic pressure in the cell.
(d) They help the plant in its growth by the process of cell division.

Answer/ Explanation

(d) They help the plant in its growth by the process of cell division.

15. The proteins and lipids, essential for building the cell membrane, are manufactured by:
(a) Endoplasmic reticulum
(b) Golgi apparatus
(c) Mitochondria
(d) Peroxisomes

Answer/ Explanation

(a) Endoplasmic reticulum

MCQ Questions for Class 9 Science Chapter 4 Structure of The Atom with Answers

October 27, 2021July 18, 2020 by Kishen

MCQ Questions for Class 9 Science Chapter 4 Structure of The Atom with Answers

MCQs from Class 9 Science Chapter 4 – Structure of The Atom are provided here to help students prepare for their upcoming Science exam.

MCQs from CBSE Class 9 Science Chapter 4: Structure of The Atom

1. Who discovered the electron?
(a) Rutherford
(b) Chadwick
(c) Thomson
(d) Goldstein

Answer/ Explanation

2. Which isotope is used in the nuclear power plants to generate electricity?
(a) Uranium 235
(b) Iodine 131
(c) Cobalt 60
(d) Uranium 238

Answer/ Explanation

(a) Uranium 235

3. Why was the Thomson’s Model of an atom failed?
i. It could not explain the screening of negative charges from that of positive
ii. It did not tell about the presence of electrons
iii. It did not give an idea about the discrete energy levels
iv. It explained the atom as a whole to be electrically neutral
Choose the correct option from the following:
(a) Only (iii)
(b) Both (i) & (iii)
(c) Only (i)
(d) Both (ii) & (iv)

Answer/ Explanation

(b) Both (i) & (iii)

4. What was the source of alpha particles in Rutherford scattering experiment?
(a) Hydrogen nucleus
(b) Argon nucleus
(c) Helium nucleus
(d) None of these

Answer/ Explanation

5. What property of an element determines its chemical behaviour?
(a) Size of an element
(b) Valency of an element
(c) Molar mass of the element
(d) None of these

Answer/ Explanation

(b) Valency of an element

6. Which of the following does not match the characteristics of an Isotope?
(a) Isotopes of some elements are radioactive
(b) Isotopes are the atoms of different elements
(c) Isotopes differ in number of neutrons
(d) Isotopes have similar chemical properties

Answer/ Explanation

(b) Isotopes are the atoms of different elements

7. Which of the two will be chemically more reactive, Sulphur(S) with atomic number 16 or Chlorine (Cl) with atomic number 17?
(a) Chlorine
(b) Sulphur
(c) Both are equally reactive
(d) Can’t say

Answer/ Explanation

(a) Chlorine

8. Which of the following elements does not exhibit the electrovalencey?
(a) Sodium
(b) Calcium
(c) Carbon
(d) Chlorine

Answer/ Explanation

9. Which of the following statements is incorrect about the structure of an atom?
i. The whole mass of an atom is concentrated in the nucleus
ii. The atom is an indivisible particle
iii. The atom as a whole is neutral
iv. All the atoms are stable in their basic state
Choose the right option among the following:
(a) (i) and (iii)
(b) only (ii)
(c) (ii) and (iv)
(d) none of these

Answer/ Explanation

10. Which scientist gave the concept of fixed energy levels around the nucleus?
(a) Ernest Rutherford
(b) Neils Bohar
(c) J.J.Thomsan
(d) None of these

Answer/ Explanation

(b) Neils Bohar

11. What prevents an atom from being collapsed?
(a) The nuclear forces
(b) Movement of electrons in discrete energy levels
(c) The electron-electron repulsions
(d) All of these

Answer/ Explanation

(b) Movement of electrons in discrete energy levels

12. Which of the following pairs are isobars?
(a) ₁₇Cl³⁵ & ₁₇Cl³⁷
(b) ₁₈Ar⁴⁰ & ₂₀Ca⁴⁰
(c) ₆C¹² & ₆C¹⁴
(d) None of these

Answer/ Explanation

(b)₁₈Ar⁴⁰ & ₂₀Ca⁴⁰

13. Which of the following is an incorrect statement in reference with observation in Rutherford’s α-particle scattering experiment?
(a) Some of the α-particles rebound after hitting the gold foil
(b) Some of the particles deflected from their path
(c) Some of the particles not pass through the gold foil
(d) Most of the particles pass straight through the gold foil

Answer/ Explanation

(a) Some of the α-particles rebound after hitting the gold foil

14. Which radioactive element is used in the treatment of cancer?
(a) Iodine-131
(b) Uranium-234
(c) Plutonium-239
(d) Cobalt-60

Answer/ Explanation

(d) Cobalt-60

15. Why do most of the elements try to participate in the chemical combinations?
i. To gain more electrons
ii. To achieve Inert Gas configuration
iii. To complete their octet
iv. To complete their inner shells
Choose the correct option among the following
(a) Both (i) & (iii)
(b) Both (ii) & (iii)
(c) Only (ii)
(d) Both (i) & (iv)

Answer/ Explanation

(b) Both (ii) & (iii)

MCQ Questions for Class 9 Science Chapter 3 Atoms and Molecules with Answers

October 27, 2021July 18, 2020 by Kishen

MCQ Questions for Class 9 Science Chapter 3 Atoms and Molecules with Answers

MCQs from Class 9 Science Chapter 3 – Atoms and Molecules are provided here to help students prepare for their upcoming Science exam.

MCQs from CBSE Class 9 Science Chapter 3: Atoms and Molecules

1. Which of the following correctly represents 360g of water?
(i) 2 moles of water
(ii) 20 moles of water
(iii) 6.022 × 10²³ molecules of water
(iv) 1.2044 × 10²⁵ molecules of water
(a) (i)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)

Answer/ Explanation

(d) (ii) and (iv)

2. Which of the following statements is not true about an atom?
(a) Atoms are not able to exist independently.
(b) Atoms are the basic units from which molecules and ions are
formed.
(c) Atoms are always neutral in nature.
(d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch.

Answer/ Explanation

(d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch.

3. 1 u or 1 amu means
(a) 1/12th mass of C-12 atoms
(b) Mass of C-12 atom
(c) Mass of O-16 atom
(d) Mass of Hydrogen molecule

Answer/ Explanation

(a) 1/12th mass of C-12 atoms

4. Which of the following contains maximum number of molecules?
(a) 19 CO₂(b) 1 g N₂(c) 1 g H₂(d) 1 g CH₄

Answer/ Explanation

5. A sample of NH₃molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports:
(a) Law of Conservation of Mass
(b) Las of Multiple Proportions
(c) Law of Definite Proportions
(d) Avogadro’s Law

Answer/ Explanation

6. An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be:
(a) XY
(b) XY₂(c) X₂Y
(d) XY₄

Answer/ Explanation

(b) XY₂

7. The molecular formula of potassium nitrate is ________.
(a) KNO₃(b) KNO
(c) KNO₂(d) KON

Answer/ Explanation

(a) KNO₃

8. 3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms in the solution are:
(a) 6.68 ×10²³
(b) 6.09 ×10²²
(c) 6.022 ×10²³
(d) 6.022 ×10²¹

Answer/ Explanation

(a) 6.68 × 10²³

9. Molecular mass is defined as the:
(a) Mass of one molecule of any substance compared with the mass of one atom of C – 12
(b) Mass of one atom compared with the mass of one atom of hydrogen
(c) Mass of one atom compared with the mass of one molecule
(d) None of the above

Answer/ Explanation

(a) Mass of one molecule of any substance compared with the mass of one atom of C – 12

10. A change in the physical state can be brought about
(a) only when energy is given to the system
(b) only when energy is taken out from the system
(c) When energy is either given to, or taken out from the system
(d) Without any energy change

Answer/ Explanation

11. The atomic mass of sodium is 23. The number of moles in 46g of sodium is ________.
(a) 4
(b) 2
(c) 0
(d) ½

Answer/ Explanation

(b) 2

12. Which of the following represents a correct chemical formula?
(a) CaCl
(b) BiPO₄
(c) NaSO₄
(d) NaS

Answer/ Explanation

(b) BiPO₄

13. What is the formula mass unit of ZnO?
(a) 18 u
(b) 81 u
(c) 88 u
(d) 188 u

Answer/ Explanation

(b) 81 u

14. How many atoms of oxygen are present in 300 grams of CaCO₃?
(a) 54.207 × 10²³
(b) 6.207 × 10²³
(c) 12.207 × 10²³
(d) 22.2 × 10²³

Answer/ Explanation

(a) 54.207 × 10²³

15. Which of the following represents the correct relation between Avogadro’s number (N_o), number of particles (N) and moles (n)?
(a) n = N / N_o(b) n = N_o / N
(c) n = N N_o (d) all are correct

Answer/ Explanation

(a) n = N / N_o