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1.
A solid weighs 0.040N in air and 0.024N when fully immersed in a liquid of density 800kgm. Calculate the volume of the solid (g = 10ms2)
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A.
2.0 x 10-6m3
B.
2.5 x 10-6m3
C.
3.0 x10-6m3
D.
2.0 x 10-6m3
Explanation. Give a better Explanation
Weight of liquid displaced = Upthrust
= (0.040 - 0.024)N
= 0.016N = 0.016/10 = 1.6 X 10-3kg
Volume of the object = Volume of liquid displaced
=

  Mass of liquid     = 1.6 x 10-1kg
density of liquid      800kgm-2


= 2.0 x 106m3 (A)



2.
A body of mass 5kg starts from rest and is acted upon by a force 100N, the acceleration in ms2 and final velocity after 10secs will be
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A.
20ms2, 20ms1
B.
25ms2, 250ms
C.
20ms2 200ms4
D.
10ms2 300ms-4
Explanation. Give a better Explanation
Ft = mv - mu
Ft = m (v-u)
100 x 10 = 5(v-0)
1000 = 5v
V = 200m/s
V = u – at
200 = 0 – mass
a = 20m/s2 (C)


3.
All these are true about impulse except
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A.
change in momentum of a body
B.
its unit is Ns
C.
product of force and time
D.
change in acceleration of a body
Explanation. Give a better Explanation
Impulse, Ft = m(v-u)

(D)


4.
A car of mass 100kg moves at a constant speed of 20m/s along a horizontal road where the friction force is 200N. Calculate the power developed by the engine.
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A.
2000 watt
B.
3000 watt
C.
4000 watt
D.
5000 watt
Explanation. Give a better Explanation
Power, P = = FV

V = velocity
Power P = FV = (200N (20m/s)
= 4000W (C)



5.
According to Newton’s second law of motion:
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A.
momentum is proportional to force action
B.
action is equal to reaction but in the opposite direction
C.
impulse force is inversely proportional to time
D.
force is proportional to rate of change of momentum
Explanation. Give a better Explanation
The second law of motion states that a body which is subjected to a net
external force (F) acquires
acceleration which is directly proportional to the force and inversely proportional to the mass of the body i.e. F = ma
(C)


6.
The weight of heat energy needed to freeze one kilogramme of milk at the inversely point is known as
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A.
heat energy
B.
intent heat of fusion
C.
specific latent heat of fusion
D.
specific heat capacity
Explanation. Give a better Explanation
Specific latent heat of fusion (C)


7.
In a certain process 12,000 calories of Hexane is supplied to the system while the system does work 7500J. Find the change in internal energy: Note I cal=4.1 84J
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A.
57,708J
B.
42,708J
C.
35,208J
D.
50,208J
Explanation. Give a better Explanation
Since I calorie = 4.184J
12,000 calorie = (4.184 x 12,000)J = 50.208J
heat supplied = Work done
(∆Ω) + ∆U (internal energy)
50,208 = 7500J + ∆5
∆5 = (50.208 – 7500)J
= 42708J (A)


8.
Some water is heated in a pot. The major mode(s) of the heat transfer through the water is/are by:
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A.
convection
B.
conduction
C.
radiation
D.
conduction and radiation
Explanation. Give a better Explanation
Convection is the transfer of heat from a hotter region of a Fluid to a colder region through the actual motion of the fluid (A)


9.
Calculate the quantity of heat required to completely convert 20kg ice at 0ºC of water at the same temperature (specific latent heat of fusion of ice = 336Jkg-1
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A.
8.06KJ
B.
706KJ
C.
538KJ
D.
6.72KJ
Explanation. Give a better Explanation
Heat required to change the phase of
mass, in of the substance is Q = rnLf
= 20kg x 336Kg-1
= 6.72 x 103J
= 6.72kJ (D)


10.
An object of mass 10g requires 20J of heat energy to change its temperature by 20ºC. Calculate the specific heat capacity of the object.
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A.
0.1Jg-1K-1
B.
0.2g-1K-1
C.
0.4Jg-1K-1
D.
0
Explanation. Give a better Explanation
Specific heat capacity = m x c x ∆θ
= (0)(20)(20)
Required, H = mcθ
20 = 10 x c x 20K
(A)


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