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📘 GRADE 11 BIOLOGY – UNIT 1

Biology and Technology
🔬 PART 1: MULTIPLE CHOICE QUESTIONS (20)

1. The blend of biology and technology forms:
a) Biochemistry
b) Biotechnology
c) Biophysics
d) Bioinformatics
2. Which of the following technologies was imitated from the mound architecture of termites?
a) Bullet train
b) The East Gate Center in Harare
c) Injection needle
d) Robotic arm
3. The first heavy aircraft technology was designed by imitating:
a) Insects
b) Birds and bats
c) Fish
d) Reptiles
4. Injection needle technology was copied from:
a) Bee stinger
b) Mosquito proboscis
c) Spider fangs
d) Animal teeth
5. A robotic arm was imitated from:
a) Human arm
b) Elephant trunk
c) Bird wing
d) Spider leg

6. The noses (front) of bullet trains were designed by imitating the shape of:

a) Eagle beak
b) Kingfisher beak
c) Swordfish snout
d) Dolphin nose


8. Bioinformatics is a scientific discipline involving:

a) Study of physical devices for biological information
b) Computer technology to collect, store, analyze, and disseminate biological data
c) Study of species distribution
d) Study of biochemical substances in plants

9. A device used to measure body temperature is:

a) Microscope
b) CT scan
c) Digital thermometer
d) GPS

10. An HIV test is used to:

a) Measure blood sugar level
b) Detect pregnancy
c) Identify infection with the virus
d) Measure body fat

11. A pregnancy urine test detects the presence of:

a) Estrogen
b) Progesterone
C) Human Chorionic Gonadotropin (HCG)
d) Testosterone

12. Which of the following is a positive impact of biology on society?

a) Biological weapon production
b) Ensuring food security through increased productivity
c) Depletion of natural resources
d) Pollution from industrial emissions

13. The three Rs principles for ethical treatment of animals in research are:

a) Research, Record, Report
b) Reduction, Refinement, Replacement
c) Respect, Restore, Recycle
d) Remove, Replace, Return

14. Reduction in animal research aims to:

a) Replace animals with computer models
b) Minimize the number of animals used
c) Improve living conditions of animals
d) Use less invasive techniques

15. Refinement in animal research aims to:

a) Reduce the number of animals
b) Replace animals with cell cultures
c) Reduce suffering using less invasive techniques
d) Use computer simulated models

16. Replacement in animal research involves:

a) Using fewer animals
b) Improving medical care for animals
c) Substituting animals with cell cultures or computer models
d) Better living conditions for animals

17. Which of the following is an example of unethical treatment of plants?

a) Planting trees
b) Conserving seeds for future use
c) Deforestation and burning forests for farmlands
d) Protecting endangered plant species

18. Animals are considered sentient creatures because they:

a) Have a nervous system and feel pain
b) Cannot feel emotions
c) Have no interests or values
d) Are not conscious

19. Computed Tomography scan (CT scan) is used to:

a) Measure body temperature
b) Detect pregnancy
c) Take X-ray pictures of the body to detect diseases
d) Measure blood sugar level

20. Positron Emission Tomography (PET scan) uses:

a) X-rays
b) Sound waves
c) Radioactive tracers to visualize metabolic processes
d) Magnetic fields

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Here are 10 medium-level multiple-choice questions and 10 easy-level multiple-choice questions about relations and functions, along with their answers at the end.

▎Medium-Level Questions

1. Which of the following is a function?
   a) {(1, 2), (1, 3), (2, 4)} 
   b) {(1, 2), (2, 3), (3, 4)} 
   c) {(1, 2), (2, 3), (1, 4)} 
   d) None of the above 

2. What is the range of the function f(x) = x^2 for x ∈ [-3, 3]?
   a) [0, 9] 
   b) [-9, 9] 
   c) [-3, 3] 
   d) [3, 9] 

3. If f(x) = 2x + 3, what is f(4)?
   a) 8 
   b) 11 
   c) 14 
   d) 7 

4. Which of the following represents the inverse function of f(x) = 3x - 5?
   a) f^(-1)(x) = (x + 5)/3 
   b) f^(-1)(x) = (x - 5)/3 
   c) f^(-1)(x) = 3/x + 5 
   d) f^(-1)(x) = x/3 + 5 

5. If g(x) = x^3 - 1, what is g(2)?
   a) 7 
   b) 8 
   c) 6 
   d) 5 

6. Which of the following sets of ordered pairs represents a one-to-one function?
   a) {(1, 2), (2, 3), (3, 4)} 
   b) {(1, 2), (1, 3), (2, 4)} 
   c) {(1, 2), (2, 2), (3, 4)} 
   d) {(1, 2), (3, 4), (5, 6)} 

7. The domain of the function f(x) = √(x - 4) is:
   a) [4, ∞) 
   b) (-∞, ∞) 
   c) [0, ∞) 
   d) [0, 4] 

8. If f(x) = x^2 and g(x) = x + 1, what is (f ∘ g)(x)?
   a) x^2 + 1 
   b) (x + 1)^2 
   c) x^2 + x + 1 
   d) x^2 - 1 

9. What is the vertical line test used for?
   a) To determine if a graph is a function 
   b) To find the domain of a function 
   c) To find the range of a function 
   d) To determine if a function is increasing or decreasing 

10. If h(x) = |x - 2|, what is h(-1)?
    a) -3 
    b) 3 
    c) -1 
    d) 1 

▎Easy-Level Questions

1. What is a function?
   a) A relation where each input has multiple outputs 
   b) A relation where each input has exactly one output 
   c) A set of numbers only 
   d) None of the above 

2. Which of the following is an example of a linear function?
   a) f(x) = x^2 
   b) f(x) = x + 5 
   c) f(x) = √x 
   d) f(x) = sin(x) 

3. What is the output of f(0) if f(x) = x + 5?
   a) 0 
   b) 5 
   c) -5 
   d) Undefined 

4. The equation y = mx + b represents:
   a) A quadratic function 
   b) A linear function 
   c) An exponential function 
   d) A polynomial function 

5. If f(x) = x - 2, what is f(3)?
   a) 1 
   b) -1 
   c) 5 
   d) Undefined 

6. Which of the following represents a relation?
   a) { (1,2), (2,3), (3,4)} 
   b) { (1,2), (1,3)} 
   c) { (a,b), (b,c)} 
   d) All of the above 

7. What is the y-intercept of the function y = 2x + 3?
   a) 2 
   b) 3 
   c) -3 
   d) Undefined 

8. If f(x)=2x and g(x)=x+1, what is g(f(1))?
   a) 4 
   b) 5 
   c) 6 
   d) 7 

9. The graph of which function is a parabola?
   a) f(x)=x+1 
   b) f(x)=x^2+2x+1 
   c) f(x)=e^x 
   d) f(x)=log(x)

10. Which of the following indicates that a relation is not a function?
    a) Each input has one output 
    b) An input has multiple outputs 
    c) Each output has one input 
    d) None of the above 

▎Answers

Medium-Level Questions:
1. b
2. a
3. b
4. a
5. a
6. a
7. a
8. b
9. a
10. b

Easy-Level Questions:
1. b
2. b
3. b
4. b
5. a
6. d
7. b
8. b
9. b
10. b



✅Grade 9 Chemistry questions

1. What is the scope of chemistry?

A) Only studying chemical reactions
B) Studying matter and its changes
C) Ignoring the environment
D) Focusing on physics

2. How is chemistry related to other natural sciences?

A) It has no connection to other sciences
B) It overlaps with biology
C) It is independent of other sciences
D) It interacts with physics and biology
3. What role does chemistry play in production and society?

A) None
B) Minimal impact
C) Significant impact
D) Negative impact only
4. Which of the following is a common chemical industry in Ethiopia?

A) Textile manufacturing
B) Agriculture
C) Mining
D) Leather processing
5. The modern periodic table is based on the work of:

A) Lavoisier
B) Rutherford
C) Mendeleev
D) Dalton
6. Which type of bonding involves the transfer of electrons?

A) Covalent bonding
B) Ionic bonding
C) Metallic bonding
D) Hydrogen bonding
7. What is the composition of an atom with the same number of protons but different neutrons?

A) Ion
B) Isotope
C) Molecule
D) Compound
8. Who proposed the fundamental laws of chemical reactions?

A) Avogadro
B) Boyle
C) Lavoisier
D) Mendeleev
9. Which subatomic particle has a positive charge?

A) Proton
B) Neutron
C) Electron
D) Nucleus
10. What is the main focus of chemistry?

A) Studying plants
B) Studying animals
C) Studying matter and its changes
D) Studying weather patterns
11. Which element is essential for all organic compounds?

A) Nitrogen
B) Carbon
C) Oxygen
D) Hydrogen
12. What is the relationship between chemistry and biology?

A) They are completely unrelated
B) Chemistry is a subset of biology
C) Biology is a subset of chemistry
D) They overlap in the study of living organisms
13. Which scientist is known for his contributions to the atomic theory?

A) Aristotle
B) Democritus
C) Newton
D) Galileo
14. What is the significance of Mendeleev's periodic table?

A) It classified elements based on atomic number
B) It arranged elements by increasing atomic mass
C) It predicted the properties of undiscovered elements
D) It focused only on metals
15. How does chemistry impact society?

A) It has no relevance in daily life
B) It influences medicine and technology
C) It is limited to laboratories
D) It only affects the environment negatively
16. Which type of bonding involves the sharing of electrons?

A) Ionic bonding
B) Covalent bonding
C) Metallic bonding
D) Van der Waals bonding
17. What is the smallest unit of an element that retains its chemical properties?

A) Atom
B) Molecule
C) Compound
D) Ion
18. What is the most abundant element in the universe?

A) Hydrogen
B) Oxygen
C) Carbon
D) Nitrogen
19. Who discovered the electron?

A) Rutherford
B) Thomson
C) Dalton
D) Mendeleev

20. Which type of bonding is found in metals?

A) Ionic bonding
B) Covalent bonding
C) Metallic bonding
D) Polar covalent bonding

Answer ✅
1. B) Studying matter and its changes 
2. D) It interacts with physics and biology 
3. C) Significant impact 
4. A) Textile manufacturing 
5. C) Mendeleev 
6. B) Ionic bonding 
7. B) Isotope 
8. C) Lavoisier 
9. A) Proton 
10. C) Studying matter and its changes 
11. B) Carbon 
12. D) They overlap in the study of living organisms 
13. B) Democritus 
14. C) It predicted the properties of undiscovered elements 
15. B) It influences medicine and technology 
16. B) Covalent bonding 
17. A) Atom 
18. A) Hydrogen 
19. B) Thomson 
20. C) Metallic bonding

የ ስንተኛ ክፍል ተማሪ ናችሁ?

📚 Most common Chemistry Questions for Entrance Exam from  Chemical Bonding

1. Which type of chemical bond involves the sharing of electrons between atoms?
  a) Ionic bond
  b) Covalent bond
  c) Metallic bond
  d) Hydrogen bond

2. What type of bond is formed between a metal and a nonmetal?
  a) Covalent bond
  b) Metallic bond
  c) Ionic bond
  d) Hydrogen bond

3. Which of the following best describes an ionic bond?
  a) Sharing of electrons
  b) Attraction between positive and negative ions
  c) Delocalized electrons in a lattice
  d) Weak intermolecular force

4. In a covalent bond, how many electrons are shared between two atoms in a single bond?
  a) 1
  b) 2
  c) 3
  d) 4

5. Which type of bond is primarily responsible for the high electrical conductivity of metals?
  a) Ionic bond
  b) Covalent bond
  c) Metallic bond
  d) Hydrogen bond

6. What is the term for the force of attraction between molecules?
  a) Intramolecular force
  b) Intermolecular force
  c) Ionic attraction
  d) Covalent bond

7. Which of the following is the strongest type of intermolecular force?
  a) London dispersion forces
  b) Dipole-dipole interactions
  c) Hydrogen bonding
  d) Metallic bonding

8. What type of bond is found within a water molecule (H₂O)?
  a) Ionic bond
  b) Covalent bond
  c) Metallic bond
  d) Hydrogen bond

9. Which of the following molecules contains a polar covalent bond?
  a) O₂
  b) CH₄
  c) NaCl
  d) HCl

10. What property of an atom determines its ability to attract electrons in a chemical bond?
  a) Atomic mass
  b) Electronegativity
  c) Atomic radius
  d) Ionization energy

11. Which of the following compounds is most likely to exhibit ionic bonding?
  a) CO₂
  b) H₂O
  c) NaCl
  d) CH₄

12. Which of the following is an example of a molecule with a double bond?
  a) H₂
  b) N₂
  c) O₂
  d) CH₄

13. Which statement best describes the behavior of electrons in a metallic bond?
  a) Electrons are shared equally between atoms.
  b) Electrons are transferred from one atom to another.
  c) Electrons are delocalized and move freely through the structure.
  d) Electrons are held tightly within individual atoms.

14. What is a lone pair of electrons?
  a) Electrons shared between two atoms.
  b) Electrons involved in an ionic bond.
  c) Electrons that are not involved in bonding.
  d) Electrons in the outermost energy level.

15. Which of the following affects the strength of an ionic bond?
  a) The size of the atoms involved.
  b) The electronegativity difference between the atoms.
  c) The number of valence electrons.
  d) The number of lone pairs.

Answers:

1. b
2. c
3. b
4. b
5. c
6. b
7. c
8. b
9. d
10. b
11. c
12. c
13. c
14. c
15. b



Chemistry questions

I. Types of Chemical Bonds

1. What type of chemical bond is formed by the sharing of electrons between atoms?

a) Ionic bond
b) Covalent bond
c) Metallic bond
d) Hydrogen bond

Answer: b) Covalent bond

2. What type of chemical bond is formed by the transfer of electrons between atoms, creating ions?

a) Covalent bond
b) Metallic bond
c) Hydrogen bond
d) Ionic bond

Answer: d) Ionic bond

3. Which type of bond involves a "sea" of delocalized electrons?

a) Covalent bond
b) Ionic bond
c) Metallic bond
d) Hydrogen bond

Answer: c) Metallic bond

4. Which of the following is NOT a strong chemical bond?

a) Covalent bond
b) Ionic bond
c) Metallic bond
d) Hydrogen bond

Answer: d) Hydrogen bond (Hydrogen bonds are relatively weak intermolecular forces)

5. A bond formed between a metal and a nonmetal is most likely:

a) Covalent
b) Metallic
c) Ionic
d) Polar Covalent

Answer: c) Ionic

II. Properties of Chemical Bonds

6. What is electronegativity?

a) The ability of an atom to conduct electricity.
b) The ability of an atom to attract electrons in a chemical bond.
c) The tendency of an atom to lose electrons.
d) The size of an atom.

Answer: b) The ability of an atom to attract electrons in a chemical bond.

7. A bond where electrons are shared unequally is referred to as:

a) Nonpolar covalent
b) Polar covalent
c) Ionic bond
d) Metallic bond

Answer: b) Polar covalent

8. Which type of bond typically results in the formation of crystalline solids with high melting points?

a) Covalent bond
b) Metallic bond
c) Ionic bond
d) Hydrogen bond

Answer: c) Ionic bond

9. Which type of bond is primarily responsible for the electrical conductivity of metals?

a) Covalent bond
b) Metallic bond
c) Ionic bond
d) Polar covalent bond

Answer: b) Metallic bond

10. Which of the following properties is characteristic of molecules held together by covalent bonds?

a) High melting point
b) Good electrical conductivity
c) Poor electrical conductivity
d) Formation of crystalline solids

Answer: c) Poor electrical conductivity

III. Bond Polarity and Strength

11. What is the main factor that determines whether a bond is polar or nonpolar?

a) Number of electrons shared
b) Electronegativity difference between the bonded atoms
c) Size of the bonded atoms
d) Temperature of the reaction

Answer: b) Electronegativity difference between the bonded atoms

12. A bond between two identical atoms (e.g., H-H) is always:

a) Polar covalent
b) Ionic
c) Nonpolar covalent
d) Metallic

Answer: c) Nonpolar covalent

13. Which bond is generally considered to be stronger?

a) Single bond
b) Double bond
c) Triple bond
d) Hydrogen Bond

Answer: c) Triple bond

14. The strength of a covalent bond depends on:

a) Number of protons in the nucleus
b) Size of the atoms
c) Number of shared electron
d) Both b and c

Answer: d) Both b and c

15. Which of the following is the weakest type of intermolecular force?

a) Hydrogen bond
b) Dipole-dipole interaction
c) London dispersion forces
d) Ionic bond

Answer: c) London dispersion forces

IV. Related Concepts

16. What is a molecule?

a) An atom with a positive charge
b) An atom with a negative charge
c) Two or more atoms held together by chemical bonds
d) An atom with equal number of electrons and protons

Answer: c) Two or more atoms held together by chemical bonds

17. What is an ion?

a) A molecule
b) An atom that has lost or gained electrons
c) An atom with equal number of protons and electrons
d) A group of atom held by non covalent bond

Answer: b) An atom that has lost or gained electrons

Multiple Choice Questions on Chemical Equilibrium

1. In a reversible reaction, when the rate of the forward reaction equals the rate of the reverse reaction, the system is said to be in:

A. Dynamic equilibrium
B. Irreversible equilibrium
C. Static equilibrium
D. Unstable equilibrium

2.Which of the following factors does NOT affect the position of chemical equilibrium?

A. Temperature
B. Pressure
C. Catalyst
D. Concentration of reactants and products

3. The equilibrium constant expression (Kc) for the reaction: 2A + 3B ⇌ C + D is:

A. [C][D] / [A]²[B]³
B. [A]²[B]³ / [C][D]
C. [A]³[B]² / [C][D]
D. [C][D] / [A][B]

4. Le Chatelier's Principle states that if a stress is applied to a system at equilibrium, the system will respond by:

A. Increasing the stress
B. Decreasing the stress
C. Neutralizing the stress
D. Restoring equilibrium by shifting the reaction in a direction that reduces the stress

5. Which of the following is NOT a common term used in phase equilibrium?

A. Component
B. Phase
C. Molecule
D. Degree of freedom

6. The phase rule helps in determining the number of:

A. Molecules in a system
B. Components, phases, and degrees of freedom in a system
C. Moles of reactants in a reaction
D. Equilibrium constants in a reaction

7. A system at equilibrium is characterized by:

A. Constant concentrations of reactants and products
B. Constant temperature only
C. Constant pressure only
D. Constant volume only

8. The equilibrium constant (Kc) is a ratio of:

A. Concentration of products to reactants at equilibrium
B. Rate of forward reaction to rate of reverse reaction
C. Number of moles of products to reactants
D. Temperature of the reaction system

9. Which of the following is NOT a condition for the attainment of chemical equilibrium?

A. Closed system
B. Reversible reaction
C. Constant temperature
D. Excess reactants

10. The equilibrium constant (Kc) for a reaction is affected by changes in:

A. Catalyst concentration
B. Temperature
C. Volume of the container
D. Presence of impurities in the reactants


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