# Physics | Study Mode

Question 1
A
20ms2, 20ms1
B
25ms2, 250ms
C
20ms2 200ms4
D
10ms2 300ms-4
##### 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)

Question 2
A

momentum is proportional to force action

B

action is equal to reaction but in the opposite direction

C

The acceleration of an object as produced by a  force is inversely proportional to the mass of the object

D

force is proportional to rate of change of momentum

##### 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)

Question 3
A
heat energy
B
intent heat of fusion
C
specific latent heat of fusion
D
specific heat capacity
##### Explanation
Specific latent heat of fusion (C)

Question 4
A

57,708J

B

42,708J

C

35,208J

D

50,208J

##### Explanation

Since I calorie = 4.184J
12,000 calorie = (4.184 x 12,000)J = 50.208J
heat supplied = Work done
() + U (internal energy)
50,208 = 7500J + 5
5 = (50.208 7500)J
= 42708J (B)

Question 5
A
convection
B
conduction
C
D
##### 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)

Question 6
A
8.06KJ
B
706KJ
C
538KJ
D
6.72KJ
##### 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)

Question 7
A
Alpha
B
x-rays
C
beta
D
neutron
##### Explanation
Apha decay produces Helium particle
2He (A)

Question 8
A
40.7Nm2
B
60.0Nm2
C
32.7Nm2
D
52.6Nm2
##### Explanation

(C)

Question 9
A

the sun passes between the moon and the Earth

B

the sun passes between the Earth and the sun

C

the moon passes between the earth and the sun

D

the moon and the Earth rotate together

##### Explanation

When the moon comes between the sun and the earth, the shadow of the moon may fall on the Earth. If one is living
on the part of the Earth that is in moons shadow, the light from the sun cut off and we are in darkness. Since we cannot see
the sun we call this an eclipse of the sun (C)

Question 10
A
2m
B
0.5m
C
4m
D
1m
##### Explanation
A

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