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Question 51
A
electromotive force 
B
electric potential difference 
C
electric energy 
D
kinetic energy 
Explanation.
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Electric potential difference: work needed per unit of charge to move a test charge between the two points.
Electric energy: energy derived from electric potential energy.
Kinetic energy: moving energy


Correct Option:
A


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Question 53
A
0.3? 
B
3.3? 
C
3.6? 
D
4.8? 
Explanation.
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Power delivered to head lamp = \(\frac{V_2}{R}\)

  = 40W

  R = \(\frac{V_2}{40}\)

  = \(\frac{(12 × 2)}{40}\)

  = 3.6Ω


Correct Option:
C

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Question 54
A
15\(^o\) 
B
18\(^o\) 
C
22\(^o\) 
D
24\(^o\) 
Explanation.
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X = \(\frac{4}{3}\) r = ?

  Shell’s law:. 7 = \(\frac{Sin 2^0}{ Sin r^0}\)

  \(\frac{V}{g}\) = \(\frac{Sin 30^0}{Sin r^0}\)

  Sin\(r^0\) = \(\frac{3 Sin 30^0}{4}\)

  Sin \(r^0\) = 0.375

  R \(^o\) = Sin-1 (0.375)

  R \(^o\) = 22.02 \(^o\)

  R \(^o\) = 22 \(^o\)


Correct Option:
C

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Question 55
A

15.0\(^o\)C

 
B

45.0\(^o\)C

 
C

52.5\(^o\)C

 
D

60.0\(^o\)C

 
Explanation.
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Power = 1kw=100W

  Time = 2mins = 2 × 60 = 120secs

  Energy = power × time

  1000 × 120 = 120,000J

  Energy = mc(θ\(_2\) – θ\(_1\))

  120,000 = 2 × 4000(θ\(_2\) – θ\(_1\))

  θ2 = 30 + 15 = 45 \(^o\) C


Correct Option:
B

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Question 56
A
Electrons 
B
Ion 
C
Neutron 
D
Proton 
Explanation.
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Ion: an atom with a net electric charge due to loss or gain of one or more electrons
Neutron: a subatomic particle of about the same mass as a proton without electric charge.
Proton: a subatomic particle with a positive charge


Correct Option:
A

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Question 57
A
total kinetic energy of its molecules 
B
average kinetic energy of its molecules 
C
average speed of its molecules 
D
maximum speed of its molecules 
Explanation.
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[Average kinetic energy of its molecules]


Correct Option:
B

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Question 58
A
Impulse 
B
Momentum 
C
Inertia 
D
Friction 
Explanation.
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An impulse is equal to the net force on the object times the time period over which this force is applied. Impulse is derive from the equation F = ma, which comes from Newton's second law of motion


Correct Option:
A

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Question 59
A
Diffusion 
B
Brownian motion 
C
Diffraction 
D
Crystallization 
Explanation.
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Diffusion is the net movement of molecules/atoms from a region of high concentration to low concentration.

  Brownian motion is the erratic random movement of microscopic particles in a field.

  Diffraction is the various phenomena that occur when a wave encounters an obstacle.


Correct Option:
D

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Question 60
A
50km 
B
25km 
C
15km 
D
10km 
Explanation.
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Distance = speed × time

  = \(\frac{(\frac{100 \times 103}{3600})}{15 \times 60}\)

  = 25km


Correct Option:
B

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