## Physics | Study Mode

Question 1
A
2.44mm
B
2.46mm
C
2.86mm
D
2.96mm
Explanation.

No official Explanation yet!

Question 2
A
MLT$$^{-1}$$
B
MLT$$^{-2}$$
C
MLT
D
ML
Explanation.

Impulse = Force $$\times$$ time

Force has the dimension $$\frac{ML}{T^{2}}$$, hence

Impulse= $$\frac{ML}{T^{2}} \times T = \frac{ML}{T}$$

Question 3
A
3.0$$ms^{-1}$$
B
4.5$$ms^{-1}$$
C
6.0$$ms^{-1}$$
D
18.0$$ms^{-1}$$
Explanation.

Given that $$u = 0ms^{-1}, a = 2ms^{-2}, s = 9m$$

We can use the equation, $$v^{2}=u^{2} +2as$$ so that we have,

$$v^{2} = 0^{2} + 2\times 2\times 9$$

$$v^{2} = 36; v= 6.0ms^{-1}$$

Note; u = Initial velocity

v = final velocity

a = acceleration

s = distance covered

Question 4
A
Molecules of solids move more freely than molecules of liquids and gases
B
Molecules of solids are more closely packed than those of liquids
C
Energy is required to break the intermolecular forces of attraction between molecules
D
Molecules of liquids move about within the liquid and they are in constant motion
Explanation.

All other properties of the different states of matter holds except that the molecules of solids don't move freely due to the fact that the particles in the solids are closely packed so it inhibits free motion.

Question 5
A
I only
B
II only
C
I and II only
D
II and III only
Explanation.

The body while coming down is acted upon by acceleration due to gravity, hence, the vertical force is constant. Also, at maximum height, the vertical velocity is 0 and then increases as the body comes downward.

Question 6
A
4.0$$ms^{-2}$$
B
13.1$$ms^{-2}$$
C
16.0$$ms^{-2}$$
D
22.6$$ms^{-2}$$
Explanation.
Resultant force F = (60 + 100Cos45)N = 130.1N Acceleration, a=F/m a= 130.1/10 = 13.1$$ms^{-2}$$

Question 7
A
2.0N
B
3.0N
C
3.5N
D
7.0N
Explanation.

Upthrust = weight of liquid displaced

= mass of liquid displaced $$\times$$ acceleration due to gravity

= $$\frac{200}{1000} \times 10$$

= 2N

Question 8
A
Condensation
B
Evaporation
C
Photo Emission
D
Thermionic Emission
Explanation.

No official Explanation yet!

Question 9
A
volume
B
mass
C
thickness
D
density
Explanation.

It is a type of beam balance with great precision, and it can pick up the slightest mass placed on it.

Question 10
A
B
II
C
III
D
IV
Explanation.

No official Explanation yet!

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