Physics (2018) | Study Mode

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Question 51
A
electromotive force
B
electric potential difference
C
electric energy
D
kinetic energy
Explanation

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 52
Physics (2018) Q 52 image
A
0Nm
B
3Nm
C
7Nm
D
10Nm
Explanation

Moment = Force Distance
= 5N x 2m
= 10Nm


Correct option: D
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Question 53
A
0.3?
B
3.3?
C
3.6?
D
4.8?
Explanation

Power delivered to head lamp = \(\frac{V_2}{R}\)

= 40W

R = \(\frac{V_2}{40}\)

= \(\frac{(12 2)}{40}\)

= 3.6


Correct option: C
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Question 54
A
15\(^o\)
B
18\(^o\)
C
22\(^o\)
D
24\(^o\)
Explanation

X = \(\frac{4}{3}\) r = ?

Shells 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

Power = 1kw=100W

Time = 2mins = 2 60 = 120secs

Energy = power time

1000 120 = 120,000J

Energy = mc(\(_2\) \(_1\))

120,000 = 2 4000(\(_2\) \(_1\))

2 = 30 + 15 = 45 \(^o\) C


Correct option: B
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Question 56
A
Electrons
B
Ion
C
Neutron
D
Proton
Explanation

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

[Average kinetic energy of its molecules]


Correct option: B
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Question 58
A
Impulse
B
Momentum
C
Inertia
D
Friction
Explanation

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

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

Distance = speed time

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

= 25km


Correct option: B

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