Physics | Study Mode

Question 11
A
Alpha
B
x-rays
C
beta
D
neutron
Explanation
Apha decay produces Helium particle
2He (A)

Question 12
A
40.7Nm2
B
60.0Nm2
C
32.7Nm2
D
52.6Nm2
Explanation

(C)

Question 13
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 14
A
2m
B
0.5m
C
4m
D
1m
Explanation
A

Question 15
A
virtual and magnified
B
virtual and real
C
a infinity
D
virtual
Explanation
f = 18cm & object distance, u = 12

V = -36cm

Question 16
A

24cm

B

12cm

C

10cm

D

8cm

Explanation

Object distance, U = 24cm (A)

Question 17
A

red, blue and orange

B

blue, red, orange

C

red, orange, blue

D

orange, blue, red

Explanation

Red light has the highest speed and it is the least deviated while violet with the lowest speed is the most deviated (D)

Question 18
A
600J
B
300J
C
6.8J
D
518J
Explanation
Work done Force x Distance
Force F = Kq1q2 / r2

K = 9 x 109NM2c-2q1 = 12C
Q2 = 8 C, r = 10cm d = 6cm
F =
Work done = 86.4 x 6
= 518.4J (D)
---------|4F|---|3F|---------

Question 19
A
1.7F
B
3.0F
C
4F
D
5.0F
Explanation

CE = 12/7 = 1.7F (A)

Question 20
A

5.6 minutes

B

9.6 minutes

C

10.0 minutes

D

19.3 minutes

Explanation

Heat loss by kettle = heat gained by water
1vt = mc
(6) (210)t = (3)(60)(4200)
1260t = 756000
t = 600secs = 10min

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