Physics 2015 | Study Mode

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Question 22
A
Fall freely from the earths gravitational field 
B
Is walking on the planet 
C
In between the sun and the earth 
D
Holding anything in space is negative 
Explanation.
Share Answer Weightlessness: The state of being free from the effects of gravity. (zero gravity)

Correct Option:
A
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Question 24
A
0.27g / liters 
B
0.25g / liters 
C
1.7g / liters 
D
0.15g / liters 
Explanation.
Share Answer

\( \theta1 = 35C T1 = 273 + = 73 + 35 = 308k P1 = 5 \)atm

d1 = 0.600g/ litre

2 = 350C, T2 = 2 + 3 +

= 273 + 350 = 623k, d2 = ?

P2 = 7atm

T a P a 1/d = TPK/d (where k is a constant)

Tp1 d1 = T1P2 d2, [(308 5) 0.600]

= (623 7) d2

d2 = (623 7 0.600) (308 5)

= 2616.6 1540

= 1.69g / litresd2 = 1.69g / litres

d2 = 1.70g / litres (Approx.)


Correct Option:
C
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Question 25
A
Compression and Rarefaction 
B
Comparison and Explosion 
C
Reflection only 
D
Refraction only 
Explanation.
Share Answer The vibrating particles behave like a spiral spring with a series of compression region and spaceout region.

Correct Option:
A
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Question 26
A
1, 2, 1 
B
1, 2, 2 
C
1, 1, 2 
D
2, 2, 1 
Explanation.
Share Answer Work (w) = Force (f) Distance (d)

Note: f = ma = mass acceleration

= mass acceleration distance

= kg ms2 m

= kg m2 52

(Note: the dimension of kg = M, M = L & S = T)

Work = ML2 T2 = Ma Lb Tc

i.e. Ma Lb Tc = as 1, b = 2, c = 2

The value of a, band c = 1, 2, 2

Correct Option:
B
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Question 27
A
Electromagnetic devices 
B
Magnetic relay device 
C
None at all 
D
Sextant 
Explanation.
Share Answer Magnetic relay device :is the device that controls a circuit (i.e one circuit )if a current in the second circuit is large or dangerous

Correct Option:
B
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Question 28
A
Conduction 
B
Convection 
C
Radiation 
D
Expansion 
Explanation.
Share Answer Conduction, conveying of heat or electricity through a material medium is required

Correct Option:
D
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Question 29
A
Thermometer 
B
Measuring cylinder 
C
Calorimeter 
D
Meter rule 
Explanation.
Share Answer Calorimeter is an apparatuses used for measuring the heat (Q) generated or absorbed by change of phase (state) or other physical change

Correct Option:
C
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Question 30
A
N W when suspended freely 
B
NS when suspended freely 
C
S E when suspended freely 
D
SW when suspended freely 
Explanation.
Share Answer Lodestone is a natural magnet it points approximate at N S when suspended freely

Correct Option:
B
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