JAMB Exam 2023: Day 1 Questions & Answers
Jamb 2023 Exam commenced on the 25th April 2023, In this article, we will provide an overview of the Jamb Exam Day 1 questions and answers, highlighting some of the key topics that candidates can expect to encounter. We hope that this information will be useful to candidates as they prepare for one of the most important exams of their academic career.
ENGLISH
What is the correct stress pattern for understand
UNderstand
unDERstand
underSTAND
Coming Soon…..
THE LIFE CHANGER
Today’s Real JAMB questions from the Life Changer
1.) Unmi family was
a}poor
b} affluent
c}Rich
d} Average✅
2) Umi husband is a………
a} business man
b} teacher
c} banker✅
d} civil servant
3) Salma was concious of her…………..
a} inconsiderate behavior
b} dressing✅
c}past memories
4} Umi shared Salma’s EMAL story to givers her children _
a} retribution
b} warning
c} moral development✅
d} educational background.
5} how did Umi feel during her registration …………. Answer: She recounts how she met Salma and how she embarrassed herself for saying spiteful things about the University official at the faculty registration office.
BIOLOGY
2023 BIO Q
The kind of joint found in the scapula of a mammals is……
A.sliding and gliding
B. Hinge joint
C. Pivot joints
D. Ball and socket.
The kind of joint found in the pelvic which runs the femur of a mammals is……
A.sliding and gliding
B. Hinge joint
C. Pivot joints
D. Ball and socket.
The kind of joint found in the knee and elbow of a mammals is……
A.sliding and gliding
B. Hinge joint
C. Pivot joints
D. Ball and socket.
The kind of joint found in between the atlas and axis vertebrae of a mammals is……
A.sliding and gliding
B. Hinge joint
C. Pivot joints
D. Ball and socket.
Structure joint is also found as no option………..
The structure that allows the free movement of the bones meeting at the joint is called……………….
A. Synovial fluid
B. Synovial membrane
C. Synovial ligament.
D. Synovial Cavity.
What’s the Relationship between cattle and cattle egret…….. Answer (Mutualism)
Hydra belongs to what level of organization…. Answer: Tissue
The the vestigial organ in human is…. Answer: Appendix
Respiratory organ of insect…….
Pair of contrasting genes is known as what….. Answer: Allele
For biology
- Relationship between cattle and egret is what
- Stick insect is albe to escape predators by
- Presence of vascular tissue in bryophyte enables it to
- Characteristics of plant cell, the answer is sha, centriole is absent
CHEMISTRY
30 cm3 of oxygen at 10 atmosphere pressure is placed in a 20 dm3 container. Calculate the new pressure if the temperature is kept constant.
A. 6.7 atm
B. 15.0 atm
C. 6.0 atm
D. 66.0 atm
ANSWER: A ( 15.0 atm)
Which of the following constitutes a mixture? I. Petroleum II. Rubber latex III. Vulcanizer’s solution IV. Carbon (iv) sulphide
A. I, II and III
B. I, II and IV
C. I and II only
D. I and IV
ANSWER: A ( I, II and III)
The following non-metal form acidic oxides with oxygen except?
A. phosphorus
B. sulphur
C. carbon ✅
D. chlorine
Addition of charcoal to the filter bed of sand during water treatment for township supply is to?
A. prevent goitre
B. prevent tooth decay
C. remove odour✅
D. kill germs
Using the metal activity series, the metal that can liberate hydrogen gas from steam is?
A. iron ✅
B. copper
C. tin
D. Lead
N2O4 ⇔ 2NO2 (Δ = -ve)
From the reaction above, which of these conditions would produce the highest equilibrium
yield for 𝑁2𝑂4
A. Low temperature and high pressure✅
B. Low temperature and low pressure
C. high temperature and low pressure
D. high temperature and high pressure
An organic functional group which can likely decolorize ammoniacal silver nitrate is?
A. alkene
B. alkane
C. alkyne✅
D. alkanol
A coloured gas that is known to be poisonous and can readily damage the mucous lining of
the lungs is?
A. hydrogen sulphide
B. carbon(ii)oxide
C. chlorine✅
D. sulphur(iv)oxide
SET FOUR
1. Which items correctly complete the following statment?
A catalyst can act in a chemical reaction to:
(I) increase the equilibrium constant.
(II) lower the activation energy.
(III) decrease E for the reaction.
(IV) provide a new path for the reaction.
(a) only I & II
(b) only II & III
(c) only III & IV
(d) only I & III
(e) only II & IV
2. Which of the following has a trigonal planar shape
A. NH3
B. PCl3
C. H2O
D. None of the above
3. Some metals are found in the uncombined free state while other metals are found in the combined state. What is a deciding factor?
(a) Metals with negative reduction potentials can occur in the free state while metals with positive reduction potentials occur in the combined state.
(b) The active metals can occur in the free state while the less active metals occur in the combined state.
(c) Metals with positive reduction potentials can occur in the free state while metals with negative reduction potentials can occur in the combined state.
(d) There is no way we can predict which metals will be free or combined.
(e) none of the above
4. The Hall-Heroult process is used in the production of:
(a) Mg
(b) Fe
(c) Al
(d) Au
(e) Cu
5. Which metal can be found as the free element?
(a) Na
(b) Mn
(c) Fe
(d) Cr
(e) Pt
6. In the process known as ‘roasting,’ a(n) _ is chemically converted to a(n) _.
(a) sulfide; oxide
(b) carbonate; oxide
(c) hydroxide; oxide
(d) oxide; sulfate
(e) phosphate; phosphide
7. The most abundant metal in the earth’s crust is:
(a) Cu
(b) Fe
(c) Na
(d) Al
(e) Ca
8. Which of the following halogens has the lowest electropositivity?
A. Chlorine
B. Iodine
C. Fluorine
D. Bromine
9. If the electronegativity difference between elements X and Y is zero, the bond between their atoms is?
A. Covalent
B. Electrovalent
C. Coordinate
D. Metallic
10. The charge to mass ratio of electrons was determined by
A. RA MIKIKAN
B. Niels Bohr
C. Ernest Rutherford
D. JJ Thomson
SET THREE
1. NH3 + H3O+ => NH4+ + H2O
Which of the following statements is correct about the above rxn?
A. NH3 acts as an acid
B. NH4+ acts as a base
C. H3O+ acts as an acid
D. H3O+ acts as a base
2. Which of the following is not a suitable method of preparing simple salt?
A. Hydrogenation
B. Neutralization
C. Double decomposition
D. Reaction of an acid with a metal
3. Which of the following is/are correct
I. pH = -log(H+)
II. pH = log(1/H+)
III. pH = -log(OH-)
IV. pOH = log(1/OH-)
A. Only I and IV
B. only I and II
C. I, II, AND IV
D. I, III and IV
4. Which of the following remains unchanged when heated in hydrogen?
A. PbO
B. Fe2O3
C. CuO
D. ZnO
5. Which of the following metals reacts with steam reversibly only when red hot?
A. Copper
B. Iron
C. Calcium
D. Sodium
6. What’s the catalyst used in lead chamber process for the production of sulphuric acid
A. Vanadium V oxide
B. Manganese dioxide
C. Manganese tetraoxide
D. Nickel
E. None of the above
7. Which of the following gases will rekindle a brightly splint?
B. NO2
B. NO
C. N2O
D. CL2
8. What’s the product of ostwald process?
A. Nitric acid
B. Sulphuric acid
C. Ammonia.
D. Hydrochloric acid
9. Why is helium preferred to hydrogen in filling balloons?
A. Exhibits isotopy
B. Is a component of water
C. Is diatomic
D. Is inflammable
10. The intermolecular force present in water is?
A. Hydrogen bond
B. Covalent bond
C. Dative bond
D. Ionic bond
Chemistry morning Test
LAST SET
1). Which of the following is a physical change?
A. Exposing white phosphorus to air
B. Burning kerosene
C. Dissolving calcium in water
D. Freezing ice cream
2). Sulphur exists in six forms in the solid state. This property is known as
A. Isomerism
B. Allotropy
C. Isotopy
D. Isomorphism
3). Which of the following gases contains the least number of atoms at s.t.p?
A. 1 mole of butane
B. 4 moles of chlorine
C. 3 moles of ozone
D. 7 moles of argon
4). Which important nitrogen-containing compound is produced in Haber’s process?
A. NH3
B. NO2
C. NO
D. HNO3
5). Elements in the periodic table are arranged in the order of their
A. atomic numbers
B. metallic character
C. mass number
D. relative atomic mass
6). The two ions responsible for hardness in water are
A. Ca2+ and / or Mg2+
B. K+ and / or Mg2+
C. Ca2+ and / or Li+
D. Ca2+ and / or Na+
7). The electronic configuration of element Z is 1s² 2s² 2p⁶ 3s² 3p¹. What is the formula of the compound formed between Z and tetraoxosulphate (VI) ion.
A. Z3(SO4)2
B. ZSO4
C. Z2 SO4
D. Z2(SO4)3
8). The hybridization in the compound CH3−CH2−C≡H is
A. sp³ and sp
B. sp
C. sp²
D. sp³ and sp²
9). A cell shorthand notation can be written as A / A+ // B2+ /B. The double slash in the notation represents the
A. electrolyte
B. electrodes
C. salt bridge
D. solid – liquid interface
10). The shapes of water, ammonia, carbon (iv) oxide and methane are respectively
A. linear, tetrahedral, angular and pyramidal
B. angular, pyramidal, linear and tetrahedral
C. pyramidal, linear, tetrahedral and angular
D. tetrahedral, angular, pyramidal and linear
10). Methane is prepared in the laboratory by heating a mixture of sodium ethanoate with soda lime. The chemical constituent(s) of soda lime is/are
A. Ca(OH)2 and NaOH
B. Na2CO3
C. NaCl
D. NaOH
PHYSCIS
Physics I’ll only drop topics
Linear Expansivity
Kinetic theory of gases
Work
Semi conductor (the holes are in excess than electrons is a A n type B pn junction C diode D p type
Equation of motion
Close to 70% are calculations
At what position with you place an object in a concave mirror to give an image with a magnification of 1
Center of curvature ✅
Another unit for current is?
Watt^-1
Volts^-1
Cs^-1
Js^-1
RANDOM PHYSICS QUESTIONS FROM TODAY’S JAMB EXAM
…the options aren’t there though and it’s not word for word either.
- Why do pressure pots cook food faster than other conventional pots?
- When a bar magnet is suspended freely in the Earth’s magnetic field, it will point to?
- he point where a ball moving in a viscous liquid start to move with uniform velocity is?
- A stone weighs WI Newton in air, W2 Newton in water, what is the relative density of the stone?
- A light of 6.22eV is incident on a cadmium surface. If a stopping voltage of 2.15eV is required to reduce the photocurrent to zero. Calculate the work function of the Cadmium.
- A vapour is said to be saturated when it is?
- Ten 6V cells connected in parallel will give an effective emf of?
- The ejection of electron from the surface of a hot metal is known as?
- Where does refraction takes place?
PHYSICS SET 2
- Which of the following is not a mechanical wave?
a ) Water wave b) radio wave c) sound wave d) waves on a string - The unit of the moment of couple is?
- Which of these is an advantage of the alcohol thermometer to the mercury thermometer?
ans: Low freezing point - Find the velocity ratio of a screw jack with pitch 0.3cm and arm length of 6cm
- Which of the following properly describes photoelectric effect?
- In a Capacitor, the current leads the voltage by?
- Calculations involving mass, volume, and density
- Calculate the Total capacitance connected in series, 4uF, 4uF, 4uF (Diagram)
- Calculation involving force constant, and energy stored in a spring
- If two plane mirrors are positioned side by side, the number of images formed is 8. At what angle are they positioned ?
- Calculations involving linear expansivity
- A uniform metre rule AB has a knife edge balanced at 60m away from B, when a load of 22g is kept 10m away from A, what is the weight of the metre rule?
- A pin floats on water due to which phenomenon?
- Which of the following describes photoelectric effect?
- A DC and an AC have basically the same components, except that in the DC, there is the …..?
- Which of these is the function of the p-n junction diode?
- Calculation involving heat loss, heat gain, and latent heat
IMPORTANT KEY POINTS TO NOTE
BIOLOGY
♻️VITAMINE
Vitamins are organic biocatalyst required in small quantities in the body for healthy growth and proper functioning of body tissues…..
✍️Note this very important you are going to use it before jamb and after jamb 👇
😊Vitamins are classified into.
↙️Water soluble : eg complex vitamins eg B1,B2,B6,B12.
↙️Fat soluble:eg Vitamin A, D, E, K.
Just say ADEK 🧏 to remember easily..
↙️Vitamins and their chemical names are as follow.👇👇👇.
♻️ Vitamin A……. Rectinol.
♻️Vitamin B1…🧏Thiamine.
♻️Vitamin B2…🧏.Riboflavin
♻️Vitamin B3..🧏Niacin.
♻️Vitamin B5…🧏Pantothenic acid
♻️Vitamin B6…🧏Pyridoxine
♻️Vitamins B7……🧏Biotin.
♻️Vitamin B9..🧏.Folic acid
♻️Vitamin B12…🧏Cyanocobalin.
♻️Vitamin C…🧏Ascobic acid.
♻️Vitamin D…🧏Calciferol.
♻️Vitamin E.🧏Tocopherol.
♻️Vitamin K…🧏Phylloquinone..
📝 Lack of vitamins lead to nutritional deficiency..
📝 Deficiency of roughages would results in Constipation.
📝 Fatty food contains the highest calorific value ie 37.6KJ.
CHEMISTRY
50 Notes And Key Points In Jamb Chemistry
- The most reactive metal known is Francium.
- GEL is a SOL which contains more solid particle dispersed in liquid than usual.
- The hardest substance known to man is DIAMOND.
- The lowest Oxidation State of IRON is ZERO
- Quantum Numbers only describes ELECTRONS and not ATOMS.
- Hydrogenation of Alkynes gives Alkanes
- The Law of Definite Proportion is also referred to as the law of Constant Composition.
- Sodium liberates H2 from Water = False.
*Sodium liberates H2 from Steam = True - The electrolyte used in DOWN CELL is Molten NaCl fused with Cacl2
- Na is not stored under water because it Tarnishes.
- Burning Kerosene gives CO2 + H2O
- Dissolution of Calcium in water gives CaO.
- All Nitrates are Soluble in water. Also, all nitrates unstable to heat.
- N2O is the first Anaesthetic man ever used.
- The flame used by welders is called Oxy-acetylene flame
- Consecutive members of the Alkane homologous series differ by CH2.
- The difference between drying and dehydration is that drying is removal of water while dehydration is the removal of elements of water (Hydrogen and oxygen).
- Benzene is an Aromatic hydrocarbon.
- Atomic mass is the mass of proton and neutron in the nucleus of an atom.
- Atomic number is the number of Electron an atom has.
- Electrons revolve around the atom while Proton and Neutron are inside the Nucleus of the Atom.
- Radioactivity is the spontaneous disintegration of the nuclei of an atom to emit energy and radiations such as ALPHA PARTICLES, BETA PARTICLES AND GAMMA RAYS.
- Alpha particles have the least penetrating power. Beta particles can be stopped by Aluminium foil while Gamma rays can only be stopped by LEAD BLOCK.
- The ability of CARBON to form long chains, branched chains and ring is called catenation.
- Elements that can combine with carbon to give compounds are:
Hydrogen
Oxygen
Chlorine
Nitrogen
Bromine
Phosphorus - Aliphatic Hydrocarbons could be Cyclic, Acyclic or Alicyclic.
- Pure substances have definite boiling point and melting point.
- Example of radioactive material are Uranium, Thorium and Polonium.
- The most notable scientist who contributed to the development of Periodic table between 1817 ti 1895 was Dmitri T. Mendeleev
- The fourth and fifth period contains 18 elements each.
- Elements in the same group are called CONGENERS.
- Free Hydrogen (H2) is the lightest gas known.
- Viscosity is the resistance to flow in liquids.
- Water starts boiling when the saturated vapour pressure is equal to the atmospheric pressure.
- Factors affecting boiling points of organic compounds are branching, volatility, polarity and impurity.
- The most reactive nonmetal known is fluorine.
- Impurity increases boiling point but reduces melting point.
- Ernest Rutherford is the father of nuclear science.
- Radioactivity can also be called transmutation.
- NUCLEAR ENERGY is produced by Nuclear fission and Nuclear fusion.
- Energy from the Sun is as a result of Nuclear fusion but reaches the earth via Radiation (Correction Credit: Saheed Soneye).
- The two types of radioactivity are natural radioactivity and artificial radioactivity.
- Every nucleus is positive.
- For solid which sublime, sublimation can be used to isolate the solid from its impurities if the impurities themselves do not sublime.
- CRAO.. Reduction takes place in cathode and oxidation occurs in the anode.
- Compound that rotates plane polarised light is said to be optically active.
- Cathode ray tube was the forerunner of of today’s television tube.
- R.A Millikan found the charge of an electron to be -1.60×10-19C
- Antoine Becquerel discovered Radioactivity while Marie Curie suggested the name “Radioactivity”.
- Each Hydrogen spectrum produces six series and each series produces lines while each line has specific wavelength.
Animal charcoal —- absorbs colour matter
Wood charcoal —- absorb gases
PHYSCIS
10 Key Points on Jamb Physics
1) The classification of Wave are:
Mechanical Wave (E.g Water and Sound Wave)
Electromagnetic Wave (E.g Gamma and X-Rays)
Progressive/Travelling Wave (Water And Sound)
Stationary/Standing Wave (Nodes And Antinodes)
Longitudinal Wave (E.g Sound Waves)
Transverse Wave (E.g Waves in Pipe and Strings).
2) Stationary Wave occurs when two interfering waves of the same amplitude and frequency travel in the opposite direction.
3) The velocity of Sound In:
Air is 332m/s
Water (Liquid) is 1435m/s
Iron (Solid) is 5000m/s
4) The velocity of Echo is equal to the total distance travelled by the sound divided by the time taken.
5) The quality of sound depends on the number of overtones or harmonics. It makes it possible to distinguish between two instruments playing the same note.
6) Vibration can either be free, forced or resonance.
7) An eclipse occurs due to the travel of light in a straight line.
8) 8) The application of plane mirrors is Periscope, Kaleidoscope and Sextant.
9) Refraction occurs at a constant frequency.
10) Hydrogen spectrum has all colours of white light, Sodium vapour has a yellow line (spectrum) and Mercury vapour has Blue and Green spectrum.
Concave mirror always VEM
Virtual
Erect
Magnified
Convex mirrow are always VED
Virtual.
Erect
Dimished.
Periscope.. Two plane mirror at 45•
Kaleidoscope two plane mirrow at 60•
For physics… Specific heat capacity, equilibrium of forces,temperature calculation, gravitational energy
Capacitor and capacitance
