Physics 2015 | Study Mode

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Question 51
A
kg m-2
B
kg m2
C
kg cm3
D
has no S.I unit
Explanation
Note: relative density has no S.I unit

Relative density = weight of substance weight of equal volume of water

RD = w1 (w1 w2) (no S. I unit)

Correct option: D
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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

Correct option: B
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Question 53
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) =\( M^{1}L^3 T^{2} \)

Correct option: A
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Question 54
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

Correct option: D
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Question 55
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

Correct option: C
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Question 56
A
Stone
B
Wood
C
Mercury
D
Water
Explanation
Convection take place commonly in liquids (water) and slightly in gasses

Correct option: D
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Question 57
A
Orbit
B
Lattice
C
Atomic structure
D
Energy level
Explanation
The regular arrangement of atoms in a crystalline materials is called LATTICES

Correct option: B
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Question 58
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)

Correct option: B
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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 .

Correct option: C
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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

Correct option: A

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