1
2021 REGIONAL MOCK EXAMINATIONS SWR .
ADVANCED LEVEL 0780 PHYSICS PAPER 1 MARKING GUIDE
QNS
ANS
QNS
ANS
QNS
ANS
QNS
ANS
QNS
ANS
1
D
11
A
21
A
31
B
41
A
2
C
12
D
22
B
32
C
42
C
3
B
13
B
23
C
33
C
43
D
4
A
14
B
24
D
34
A
44
C
5
C
15
D
25
A
35
B
45
B
6
B
16
C
26
C
36
D
46
D
7
A
17
A
27
B
37
B
47
C
8
D
18
A
28
A
38
C
48
A
9
B
19
C
29
D
39
A
49
B
10
C
20
D
30
D
40
B
50
A
2021 REGIONAL MOCK EXAMIN S SWR .
ADVANCED LEVEL 0780 PHYSICS PAPER 1 MARKING GUIDE
QNS
ANS
QNS
ANS
QNS
ANS
QNS
ANS
QNS
ANS
1
D
11
A
21
A
31
B
41
A
2
C
12
D
22
B
32
C
42
C
3
B
13
B
23
C
33
C
43
D
4
A
14
B
24
D
34
A
44
C
5
C
15
D
25
A
35
B
45
B
6
B
16
C
26
C
36
D
46
D
7
A
17
A
27
B
37
B
47
C
8
D
18
A
28
A
38
C
48
A
9
B
19
C
29
D
39
A
49
B
10
C
20
D
30
D
40
B
50
A
2
2021 780 P2 MOCK MARK GUIDE
1. a).
(1 mark)
since
is unitless.
. (1 mark)
Since the unit of physical quantities of LHS = unit of physical quantities of RHS, the equation is homogenous
(1 mark)
b) A taut string for which
is under a tension of 80.0 N. How much power must be
supplied to the string to generate sinusoidal waves at a frequency of 60.0 Hz and an amplitude of 6.0 cm?
The speed of the wave generated on the string is given by;
(1 mark)
Also,
(1 mark)
Finally, the power generated is
=
(1 mark)
2.a) Due to changing direction of the object as its moves round the circle. (2 marks)
b) Time taken for the car to catch up with the truck
From
,
= 8 s (2 mark)
Velocities of the car and the truck
From ,
For the car,
= 2 x 8 = 18 ms
-1
.
(1 mark)
For the truck,
= 2 x 8 = 18 ms
-1
.
(1 mark)
3. a) Every particle in the universe will attract every other particle with a force that is directly proportional to
the product of their masses and inversely proportional to the square of the distance between them.
(2 marks)
b) The resultant electric field at the point P is shown in figure S
1
From
(1 mark)
At P,
(1 mark)
(2 marks)
3
4.a)
Progressive Wave
Stationary Wave
-There is an integral shift of the wave-form
from one point to another.
-Wave-form seems fixed at a particular
position.
-Energy is transferred from one point to
another.
-Energy is stored within the wave-form.
b)
……….(1)
……(2) (1 mark)
Subtracting (1) from (2):
(1 mark)
(1mark); Using ,
(1 mark)
5.a) The energy is used to break the molecular bonds between the atoms hence the material changes from one
state to another. (2 marks)
b) i) let be the temperature rise of the iron nail. From the principle of conservation of energy,
Energy supplied by hammer = Energy gained by the nail. (1mark)
(1mark)
(1 mark)
(1marks)
6(a), (b) and (c)
a) i) When a force is applied on an object with constant mass, it produces an acceleration which is
proportional to the applied force. (2 marks)
ii)
Applying f = ma,
For the 5 kg mass and in the x-direction, we get;
;
………………..( 1) ( 1 mark )
In the y- direction,
;
;
;
…………………..(2) (1 mark)
For the 20 kg mass and in the y-direction, we get;
-----------------------(3) (1 mark)
(2) – ( 3)
(1 mark)
From (2) , (2marks)
From the work-energy theorem,
Workdone during change in KE
(1mark)
End of Document
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