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Question 1 Report
Question 2 Report
In which of the following device in the expansion of solid is a disadvantages?
I. Simple pendulum
II. Fire alarms
III. Thermostat
IV. Bimetallic thermometer
Five alarms, Thermostat and Bimetallic thermometer are application of thermal expansion of solid
Question 3 Report
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Question 15 Report
Transformers are designed so that energy losses are reduced to a minimum. This is achieved through those process.I. Using a soft iron ore
II. Laminating the iron core to reduce energy loses due to eddy current
III. Designing an efficient iron core
Question 16 Report
In an elastic collisionI. Energy is conserved
II. Energy is decreased
III. Energy is increased
IV. Linear momentum conversed
In an inelastic collision, linear momentum is conserved and energy is decreased
Momentum and kinetic energy are conserved in elastic collision
Question 17 Report
d – δy, s = (5 &ndash ;6) m/s (The Man and Image)
d2 ÷ s1 = d2 ÷ s2, y ÷ 6 = 2y ÷ s + 6
Y (s + 6) = 2y × 6
s + 6 = 12
So = 12 – 6 = 6
Since S + 6 = 0
Then, S = 6 (substitute the value of S i.e S = 6)
Into S + 6 = 0
∴So = S + 6 = 6 + 6 = 12 m/s
∴ S = 12 m/s
Question 18 Report
Question 19 Report
Mathematically
Mechanical advantage (M.A) = Load (L) ÷ Effort (E)
In symbol M.A = L/E
Note:Mechanical (advantages has no S.I unit)
If M.A = 4 then,
L/E = 4/1
The ratio of load to effort = 4 : 1 respectively
Question 20 Report
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Question 22 Report
v = wr
w = angular velocity
r = radius in an tangential circular
v = speed of an object
W = V/δ = 2/ 0.7 = 2.85
W = 2.853rads–1 (total interest whole number)
W = &approx.; 3rads–1Angular velocity (w) = 3rads–1
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Question 31 Report
Rmax = U2 ÷ α g where Rmax = 36m, U2 = ?, g = 9.8m/s2
36 = U2 ÷ 2 × 8.8
U2 = 36 × 2 × 9.8m = 705.8
√U = √ 705.6 = 26.5 (squaring both side)
u= 26.5m/s, U = 27m/s (Approx.)
The speed of projection = 27m/s2
Question 32 Report
In which of the following device in the expansion of solid is a disadvantages?I. Simple pendulum
II. Fire alarms
III. Thermostat
IV. Bimetallic thermometer
Simple pendulum does not depend on thermal expansion
Five alarms, Thermostat and Bimetallic thermometer are application of thermal expansion of solid
Question 33 Report
Question 34 Report
Question 35 Report
Question 36 Report
(P1V1) ÷ T1= (P2V2) ÷ T2
P1 = 800mmHg, V, = 76cm3, Tr = 273 + 27 = 300k
P2 = 760mmHg, V2 = ? T2= 273 + 0 = 273 + 6 = 277k
(800 × 76) ÷ 300 = (760 × V2) ÷ 273
V2 = (300 × 76 × 273) ÷ (300 × 760) = 72.8 cm3
The volume of gas as S.T.P = 72.8 cm3
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Question 39 Report
Which of the following option is right if an object fall freely to the ground?1. The total energy is Kinetic
2. The ratio of potential energy to kinetic energy is constant
3. The sum of potential and kinetic is constant
Question 40 Report
Note: f = ma = mass × acceleration
= mass ×acceleration ×distance
= kg ×ms–2 × m
= kg m2 5–2
(Note: the dimension of kg = M, M = L & S = T)
Work = ML2 T–2 = Ma Lb Tc
i.e. Ma Lb Tc = as 1, b = 2, c = –2
The value of a, band c = 1, 2, –2
Question 41 Report
Question 42 Report
Which of the following will increases the boiling point of water?I. Taking it to a high altitude
II. Dissolving a salt into it
III. Heating it in a sealed flask
IV. Increasing the rate of heat supply.
1. Heating it in a sealed flask
2. The rate of the heat supply is increased
Question 43 Report
Distance between Abioye (a) and hip image (I) = AI
i.e. AI = 4.7 + 47 = 9.4m
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Question 46 Report
i.e. V.R = x/y
v. R = 5, x/y = ?
i.e x/y = 5/1; , where x = 5, y = 1
x : y = 5 : 1
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Question 50 Report
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