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Are you brainy enough? why not try it here now!!! just answer three (3) questions one from MATHEMATICS, PHYSICS, CHEMISTRY. Any one of your choice and stand the chance of winning N200 Recharge card for your phone sent you to by Determalmo.
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MATHEMATICS
1. Given
that the mean of the numbers x1, x2, x3 ……xn
is k, find the mean of all the numbers (3x1 + 2), (3x2 +
2), (3x3 + 2), ….. (3xn +2).
2. How
many numbers less than 3000, can be formed from the digits 1,2,3,8 and 9, if no
digit is used more than once?
3. A
test was given to three classes with population 30,35 and 25. If the mean
scores are 28,35 and 25 respectively, find the mean score of the three classes.
4. Find
the acute angle between the lines 2x-y=4 and x-y=3
5. A
test consist of 12 questions out of which candidates are to answer 10. If the
first 6 questions are compulsory, in how many ways can each candidate select
her questions?
6. A
number is selected at random from the numbers 1 to 30 inclusive. What is the
probability that it is divisible by 2 or 5?
7. The
mean age of n men in a club is 50 years. Two men, aged 55 and 63 left the club
and the mean age reduced by 1 year. Find the value of n.
8. How
many ways can 12 people be divided into three groups of 2, 7 and 3 in that
order?
9. Calculate
in surd form the value of tan 15o
10.
Find the area of the circle whose
equation is x2+ y2 -4x + 8y + 11 = 0
PHYSICS
QUESTIONS
1.
State Newton’s law of
cooling?
2.
Why is it that when a
stationary car is been hit by a fast moving car, both of the cars are damaged?
Note: the other car is not in motion and cannot collide.
3.
When fuels are burned
in a flame, both heat and light are produced. There are some chemical reactions
which produce light but no heat. These reactions are said to be …………………..?
4.
Why do think a bullet
of mass 100kg moving at 1ms-1 will have the same effect on the human
body as a bullet of 0.01kg moving at 1000ms-1.
5.
What is the sure test
for polarity of a magnet?
6.
It is easier to loosen
a tight nut with a long spanner than with a short one. Why?
7.
An elephant with its
large feet can exert less pressure on the ground than a gazelle with small
hooves. Is it possible? Explain.
8.
Air has weight; this is
why it exerts pressure. So why are we not conscious of this enormous pressure
of the air?
9.
The Earth seems to be
rotating, but none of us seems to notice each other rotating with it. Why?
10.
Why are there water
vapours in the atmosphere?
11.
Rain water seems to
fall directly from the sky to us on earth, it has a great speed from above but
yet it seems not so severe on the human skin. Why is it so?
12.
The critical angle of a glass is usually
what?
13.
What instrument is used to measure the
depth of the red sea?
14.
It is easier to hear sound at night than
at day. Explain
15.
Why is it that if an ambulance car is
moving closer to you, the sound heightens and even when the ambulance is
stationary and you are the one who moved closer to it, it still heightens. But
immediately the car passes behind you a little the sound of the ambulance
decreases. What causes this effect?
CHEMISTRY
QUESTIONS
13.
Carbon is known to have
three (3) allotropes namely; DIAMOND, GRAPHITE AND ………………..?
14.
The high surface
tension of water is due to what?
15.
Why is the sulphate ion
(SO4) not involved in chemical reactions?
16.
What is added to barium
sulphite or barium carbonate from precipitating?
17.
What is the name of the
compound NH4OH?
18.
Which compound of
sulphur does not react with Acids?
19.
Gold is resistance to
most acids but what reagent of acids is used to dissolve gold?
20.
Why do sulphate ions
not taking part in redox reactions?
21.
The whole chemistry
book I have read explained that gases take up the shape and volume of its
container. However, I had only agreed with the gas having the shape of the
container and not the VOLUME of the
container. Do you agree with me? If Yes
explain and if No explain your
answer.
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