# Physics (2018) | Study Mode

Question 41
A
Commision
B
Commition
C
Comission
D
Commission
##### Explanation

Commission means a task or mission to accomplish.

Take note of the double s and the double m. All other options are wrongly spelt

Question 42
A
Micrometres screw gauge
B
Pair of dividers
C
Metre rule
D
Pair of vernier calliper
##### Explanation

A vernier scale is a visual aid to take an accurate measurement reading between two graduation markings on a linear scale by using mechanical interpolation; thereby increasing resolution and reducing measurement

Question 43
A
36.0
B
7.2
C
5.0
D
3.6

= 5 0.72

= 3.6

Question 44
A
An electron
B
An ion
C
A neutron
D
A proton
##### Explanation

If an atom gains or loses an electron, it becomes an ion. An atom that gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion

Question 45
A
0kgm
B
2kgm/s
C
4kgm/s
D
8kgm/s
##### Explanation

Initial momentum = (0.8) (5)

= 4.0kgms$$^{-1}$$

Final momentum

= (0.8) ( 5)

= 4.0kgms$$^{-1}$$

Impulse on ball

= Change in momentum

= 4.0 ( 4.0)

= 8.0.0kgms$$^{-1}$$

Question 46
A
B
Cohesive
C
Magnetic
D
Repulsive
##### Explanation

Cohesion is the inter-molecular attractive force acting between two adjacent portions of a substance, particularly of a solid or liquid. It is this force that holds a piece of matter together

Question 47
A
0.8Ns
B
1.2Ns
C
12.0Ns
D
80.0Ns
##### Explanation

Momentum = Mass x Velocity
Change in Momentum = Mass x (change in velocity)
Change in Momentum = Mass x (v - u)
Mass = 100g = 0.1kg
U = 2ms$$^{-1}$$
V = 10ms$$^{-1}$$
Change in momentum = m (v u)
= 0.1 (10 2)
= 0.1 (8)
= 0.8Ns

Question 48
A

87N

B

73.5N

C

133.3N

D

533.2N

##### Explanation

V.R=1/Sin

V.R=2

M.A=0.752=1.5

=(2010)/1.5

=133.3 N

Question 49
A
0
B
$$\frac{1}{2}$$
C
1
D
2
##### Explanation

$$\frac{I}{V}$$ = $$\frac{1}{f}$$ $$\frac{1}{u}$$

$$\frac{I}{V}$$ = $$\frac{1}{10}$$ $$\frac{1}{20}$$

= $$\frac{1}{20}$$ V

V = 20cm.

M = $$\frac{V}{U}$$

= $$\frac{20}{20}$$

= 1

Question 50
A
electromotive force
B
electric potential difference
C
electric energy
D
kinetic energy
##### Explanation

Electric potential difference: work needed per unit of charge to move a test charge between the two points.
Electric energy: energy derived from electric potential energy.
Kinetic energy: moving energy

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