## 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
Explanation.

= 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
Impulse
B
Momentum
C
Inertia
D
Friction
Explanation.

Inertia, property of a body by virtue of which it opposes any agency that attempts to put it in motion or, if it is moving, to change the magnitude or direction of its velocity. Inertia is a passive property and does not enable a body to do anything except oppose such active agents as forces and torques. A moving body keeps moving not because of its inertia but only because of the absence of a force to slow it down, change its course, or speed it up.
There are two numerical measures of the inertia of a body: its mass, which governs its resistance to the action of a force, and its moment of inertia about a specified axis, which measures its resistance to the action of a torque about the same axis.

Question 50
A
B
$$\frac{1}{2}$$
C
D
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

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