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Mosquitoes

In: Science

Submitted By lukman40
Words 17166
Pages 69
1
UTME 2001 Type R Questions
Use the graph below to answer questions 1 and 2.
100
200
Time (mins)
T(0C)
0 1 2 3 4 5 6 7 8
300
Liquid
Vapour
Solid
1. If the gas is cooled, at what temperature will it start to condense?
(A) 1250C (B) 1500C (C) 1750C (D) 2500C
2. How long does it take all the solid to melt? (A) 2.5 mins (B) 6.0 mins
(C) 1.0 mins (D) 3.0 mins
3. 25cm3 of a gas X contains Z molecules at
150C and 75mmHg. How many molecules will 25cm3 of another gas Y contain at the same temperature and pressure? (A) 2Y (B) 2Z (C) Z (D) Y
4. What mass of water is produced when
8.0g of hydrogen reacts with excess oxygen? (A) 36.0g (B) 8.0g (C) 72.0g (D) 16.0g
[H = 1, O = 16]
5. A particle that contains 9 protons, 10 neutrons and 10 electrons is a
(A) negative ion (B) positive ion
(C) neutral atom of a non metal
(D) neutral atom of a metal
6. Cancerous growth are cured by exposure to
(A) γ -rays (B) β -rays
(C) α -rays (D) x-rays
7. An oxide XO2 has a vapour density of 32.
What is the atomic mass of X
(A) 32 (B) 20 (C) 14 (D) 12
[O = 16]
8. Milikan’s contribution to the development of atomic theory is the determination of
(A) charge on electron
(B) positive rays
(C) charge to mass ratio
(D) cathode rays
9. Four elements W, X, Y, and Z have atomic numbers 2, 6, 16 and 20 respectively. Which of these elements is a metal?
(A) X (B) W (C) Z (D) Y
10. An element X with relative atomic mass
16.2 contains two isotopes 16X
8 with relative abundance of 90% and X m8 with relative abundance of 10%. The value of m is
(A) 16 (B) 18 (C) 12 (D) 14
11.
+
The diagram above represents the formation of
(A) a metallic bond
(B) an electrovalent bond
(C) a covalent bond
(D) a coordinate bond
12. Which of the following statement is correct about the average kinetic energy of the molecules of a gas?
2
(A) It increases with increase in pressure (B) It increases at constant pressure
(C) It increases…...

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