# Physics 2015 | Study Mode

Question 51
A
I only
B
III & IV only
C
II & III only
D
II only
##### Explanation

The simplest way to change the boiling point of a liquid is to change the surrounding pressure. (a) Using a closed system to artificially increase that pressure will raise the boiling point of a liquid. (b) Boiling point is dependent upon the strength of the bonds between its molecules. For this reason, adding a solute to the liquid will create stronger bonds between molecules, raising the solutions boiling point without increasing pressure.

Question 52
A
Mercury thermometer
B
gas thermometer
C
clinical thermometer
D
alcohol thermometer
##### Explanation
Gas thermometers are considered best for use to achieve an accurate temperature than others, such as liquid in glass thermometers such as mercury, clinical and alcohol thermometer

Question 53
A
A minimum of polarization effect
B
A long life
C
A cheap and safe electrolytes
D
Cost and dangerous of the cell
##### Explanation
A good electric cell should proses the following

1. A long life of an electric cell,

2. A minimum of polarization effect

3. A cheap and safe electrolytes

Except D cost and dangerous of the electric cell

Question 54
A
200volts
B
300volts
C
283volts
D
250volts
##### Explanation
Vr.m.s = V0 V2, where Vr.m.s rep. to as voltage root square mean, v = peak voltage

Vr.m.s = 200volt, v = ?

200 = V0 V2

V0 = 200v2

= 200 1.414

= 282.8 volts V0 = b &approx.; 283 volts

Question 55
A
Stone
B
Wood
C
Mercury
D
Water
##### Explanation
Convection take place commonly in liquids (water) and slightly in gasses

Question 56
A
Orbit
B
Lattice
C
Atomic structure
D
Energy level
##### Explanation
The regular arrangement of atoms in a crystalline materials is called LATTICES

Question 57
A
Diffusion
B
Osmosis
C
Surface tension
D
Cohesion
##### Explanation
Diffusion: The movement of water vapors from regions of low concentration toward regions of high concentration
Surface tension: is a force transmitted through a sting or object surface tension = force (N) Area m2(Nm2)

Question 58
A
$$M^{1}L^3 T^{2}$$
B
ML3T2
C
ML3
D
MLT-2
##### Explanation
f (MM g2)

F(GMM r2) [G gravitational constant]

GMM = Fr2

G = F02 MM = m ar2 MM (f = ma)

= (m m5-2 r2) MM

= (Kg.m52 m2) Kg.Kg

=1 kg.m3.52

The dimension mathematically representation have a quantities of M, L AND T

M (Mass) = kg, L (Length) = M, T (Time) second

G = kg-1 m2.52(Using dimension rule)

M-1.L3.T-2

The universal gravitational constant (G) =$$M^{1}L^3 T^{2}$$

Question 59
A
1 only
B
2 only
C
3 only
D
1 and 2 only
##### Explanation
The total energy at any point combination of the PE and KE

i.e. TEnergy = PE + K.E

= mgh + mr2

= m (gh + v2 )

= m (v2 + gh)

TEnergy = m (V2 + gh)

Total energy at the height (hm) = PE + KE

The sum of P.E and KE at any point is always constant .

Question 60
A
Sclerotic
B
Choroid coal
C
Optical fiber
D
Accommodation
##### Explanation
Sclerotic coat (sclera) is the tough outer coat of the eye that coves the eyeball (ii) sclerotic coat is modified in front of the eye to from a transparent and horny window

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