DRZAY:
Bosses in the house please i nee help ooo in understanding this questions:
(1) A rectangular concrete block 40cm X 30cm X 60cm of mass 10KG rests on a horizontal flat surface. What is the minimum pressure it can possibly exert on the surface?

(2) In what distance can a 1500KG automobile be stopped if the brake is applied when the speed is 20m/s and the coefficient of sliding friction is 0.7 between the tyres and the ground?

(3) The highest point of a simple pendulum bob is 5cm vertically above the lowest point as it swings to and fro between the two extreme ends. At what velocity does gt swing past the lowest point (equilibrum point) where the string is vertical? (take g = 10m/s2)

(4) A certain radioactive element has a half life of 20 years. How long will it take the activity to become 1/4 of its original?

cc: huluwajobar EngrBello Mobuoy19 Ajet001.

MhizterBharnei1:


Convection occurs in fluids not in solids, this is an example of a solid hanging in free air, it's loss of heat is simply by radiation. If you put your palm close to a red hot metal you'll feel the heat as a result of radiation which is the same in this case....take land and sea breeze, the land looses heat by radiation, it's after this loss of heat by radiation that a convectional current is now set up

DRZAY:
CHEMISTRY 1. All the following will liberate a gas when reacted with dilute hydrochloric acid except a) Sodium tetraoxosulphate(VI) salt b) Sodium trioxocarbonate(IV) salt c) Sodium suiphide d) Sodium trioxonitrate(V) 2. The isomer of a compound C5H10 which does NOT decolorize bromine water is a) 2-methylbutane b) 2,2- dimethyipropane c) 2-methylbut- l-ene d) Methylcyclobutane 3. A mixture of nitrogen, oxygen and helium contains 0.25, 0.15 and 0.4 mole of these gases respectively. If the pressure contribution due to oxygen was 2.5 atm. The partial pressure of helium is a)4.0 atm b)0.8 atm c)3.33 atm d) 6.67 atm 175 4. Elements P has atomic number of 12 while element Q has an atomic number 15. Combination of P and Q gave a compound PmQn. the respective values of m and n are a) 2and2 c) 3and2 c 5. CHx9O2—6CO2+ 6H20 The hydrocarbon, CH in the reaction above is most likely a) Analkane b)abenzene c) analkene d)analkyne 6. A 5 12cm3 sample of a gas weighed 1.236g of 20°C and a pressure of one atmosphere. The reactive molecular mass of the gas is [R = 8.314kJk-1, I atm = 101,325Jm-3] a) 58.07 b) 588.367 c) 5.88 d) 197.9 7. The amount of methane molecules, Cl4 in 8.Ograms of methane is a) 8mol b) l28mol b) 2 and 3 ) 2 and 1 c) 0.Smol d) 3.01 x lO23mol 8. The concentration of a solution obtained by dissolving 0.53g of pure anhydrous Na2CO3 in water to make 250cm3 of solution. a) 2.0 x 10-5 mol dm-3 b) 2.lgdm-3 c) 2.0 x 10-2 mol dm-3 d) 5.0 x 10-3 mol dm-3 9. What is the maximum volume of CO2 at s.t.p. that can be obtained when dilute hydrochloric acid is added to 10grams of CaCO3? [Ca=40, C=12, 0 = 16] a) 2.24 dm3 b) 22.4 dm3 176 c) 0.224 dm3 d) 22.4dm3 10. Sulphur (IV) oxide travels a given distance in l0sec. How long will it take equal 1. All the following will liberate a gas when reacted with dilute hydrochloric acid except a) Sodium tetraoxosulphate(VI) salt b) Sodium trioxocarbonate(IV) salt c) Sodium suiphide d) Sodium trioxonitrate(V) 2. The isomer of a compound C5H10 which does NOT decolorize bromine water is a) 2-methylbutane b) 2,2- dimethyipropane c) 2-methylbut- l-ene d) Methylcyclobutane 3. A mixture of nitrogen, oxygen and helium contains 0.25, 0.15 and 0.4 mole of these gases respectively. If the pressure contribution due to oxygen was 2.5 atm. The partial pressure of helium is a)4.0 atm b)0.8 atm c)3.33 atm d) 6.67 atm 175 4. Elements P has atomic number of 12 while element Q has an atomic number 15. Combination of P and Q gave a compound PmQn. the respective values of m and n are a) 2and2 c) 3and2 c 5. CHx9O2—6CO2+ 6H20 The hydrocarbon, CH in the reaction above is most likely a) Analkane b)abenzene c) analkene d)analkyne 6. A 5 12cm3 sample of a gas weighed 1.236g of 20°C and a pressure of one atmosphere. The reactive molecular mass of the gas is [R = 8.314kJk-1, I atm = 101,325Jm-3] a) 58.07 b) 588.367 c) 5.88 d) 197.9 7. The amount of methane molecules, Cl4 in 8.Ograms of methane is a) 8mol b) l28mol b) 2 and 3 ) 2 and 1 c) 0.Smol d) 3.01 x lO23mol 8. The concentration of a solution obtained by dissolving 0.53g of pure anhydrous Na2CO3 in water to make 250cm3 of solution. a) 2.0 x 10-5 mol dm-3 b) 2.lgdm-3 c) 2.0 x 10-2 mol dm-3 d) 5.0 x 10-3 mol dm-3 9. What is the maximum volume of CO2 at s.t.p. that can be obtained when dilute hydrochloric acid is added to 10grams of CaCO3? [Ca=40, C=12, 0 = 16] a) 2.24 dm3 b) 22.4 dm3 176 c) 0.224 dm3 d) 22.4dm3 10. Sulphur (IV) oxide travels a given distance in l0sec. How long will it take equal volume of helium to travel the same distance under the same conditions? [S=32, O=16, He=4} a) 1.6sec b)40sec c) 5.Osec d) 2.Ssec 11. The volume of hydrogen gas produced at s.t.p. when 100cm of 2M hydrochloric acid reacts with excess zinc is a) 2.24dm3 b) 4.482.24dm3 c) 1.12dm3 d)4.8dm3 12. During electrolysis, two cells each containing molten A1203 and fuse CaCI2 were connected in series. A current of l5Amp was passed through the cells for a given period of time. At the end of the electrolysis 9g of calcium was found to have been deposited at the cathode what mass of aluminium would be deposited in the second cell [Al=27, Ca=40] a) 8.82g b) 4.44g c) 17.60g d) 4.05g 13. The balanced equation for the reaction of tin(ii) salt with potassium ptaoxodichromate(VI) in a acidic medium can be represented as eSn2 + fCr2O7 + gH+ → hSq+ iCr3+ + jH2 O e,f,g.h,i and j are respectively a) 3,5.6.3,land4 b) 3. 1. 14.3,2and7 c) 3,2,6,1,5and6 d) 5.2,1,5,3and2 177 14. The pH of a solution containing 0.5 x 10-6 M H2S04 is a) 6.3 b) 6.5 c) 6.0 d) 5.0 15. Which of the following oxides will NOT dissolve in both dilute hydrochloric acid and 2M sodium hydroxide solution? a) Lead (II) oxide b) Aluminium oxide c) Zinc(II) oxide d) Calcium oxide 16. The I.U.P.A.C. name for the compound is a) Pent-3-enoic acid b) Pent-4-enoic acid c) Pent-2-enoic acid d) Pent-3-ene-l-oic acid 17. Metal salts of long chain fatty acids are known as a) Detergents b) double salts c) soaps d) grease a) CHCOOH and CH3CH2CH2OH b) CH3COOH and CH3CH7CH3 c) CH3COOH and CH3CH2OHof oxidation of a) butan-3-ol b) butan-I-ol c) 3-methylpropan-2-ol d) Butan-2-ol 20. Which of the following structural formulas is NOT isomeric with the others? a) CH3CH2CH2CH2-OH b) CH3-O-CH2CH2CH3 The curve above represents the solubility curve of KCIO3. The number of moles of KCIO3 crystals produced by cooling 200cm3 of a saturated solution of the salt from 65°C to 25°C is 17 a) 6.30mole b) 3.26mole c) 0.63mole d) 7.3Omole 22. During a compression process involving an ideal gas at pressure P1, when the volume, V of the gas was halved, the temperature in Kelvin increases by half its initial value. The final pressure P2 is given by a) 3P1 b) 12P1 c) 6P1 d) 1.5P1 23. Cellulose and starch can be classified as one of the following: a) Hydrocarbons b) sugars e) carbohydrates d) alkaloids ANSWER KEY I. D 6. A 11. A 16. C 21. B 2. D 7. D 12. D 17. C 22. A 3. D 8. C 13. B 18. A 23. C 4. C 9. A 14. C 19. D 5. C 10.D 15.D 20.C

Aybalance:
Omo see questions....person don die finish ooo...hope there is a.c in ui halls .

whatefa:
Pls exactly when is post jamb date? This thread is too long. Thanks

whatefa:
Pls exactly when is post jamb date? This thread is too long. Thanks

Remilekun101:
Please I can't seems to login to the portal again..... It keeps saying incorrect login details

Ayoomodaddy:

Same here... I've even tried to change password gan and it's still saying incorrect details.

Ayoomodaddy:

Same here... I've even tried to change password gan and it's still saying incorrect details.

Remilekun101:




Ah.. Same here... Maybe it's general

Remilekun101:




Ah.. Same here... Maybe it's general

trendymart:
Pls house....fellow post utme guys...Has anyone receive d any invitation yet for the exam and by what means? As am yet to received any?

PhilAmadeus:
Me sef am kinda worried cos my sis is an aspirant also,till this evening she's yet to receive any notification...pls guys have u received yours

ElRapido:
I received mine yesterday but that one isn't important

ElRapido:
I received mine yesterday but that one isn't important

Dellybanky:
please what was the notification about?

ElRapido:


Nothing joor just same thing on their site I for upload am but I can't upload pics on NL don't know why o

Aybalance:
7 days left

Aybalance:
7 days left

ennydammy11:
yet no date yet no date

Mobuoy19:


Bro, the problem is majorly ungeneral 'cause I can log in.