Physics (2017) | Study Mode

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Question 1
A

a = v2 - u\(\frac{2}{2}\)

 
B

v2 = u2 + 2as

 
C

s = \(\frac{1}{2}\)ut + at2

 
D

v2 - u2= 2as

 
Explanation.
Share Answer

s = \(\frac{1}{2}\)ut + at2 is a wrong equation, it should be s = \(\frac{1}{2}\)ut + at2


Correct Option:
C
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Question 2
A
x - ray 
B
Radio waves 
C
sunlight 
D
sound waves 
Explanation.
Share Answer Electromagnetic waves do not require any material medium, but sound waves is a mechanical wave that require a material medium

Correct Option:
D
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Question 3
A
18.57NC\(^{-1}\) 
B
53.06N C\(^{-1}\) 
C
2.28NC\(^{-1}\) 
D
0.80NC\(^{-1}\) 
Explanation.
Share Answer Electric Field Intensity (E) = \(\frac{v}{d}\)

= \(\frac{\text{potential difference}}{\text{distance}}\)

= \(\frac{6.5v}{35cm}\)

= \(\frac{6.5}{35 \times 10^{- 2}}\)

= 18.57NC\(^{-1}\)

Correct Option:
A
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Question 4
A
To prevent resonance on the bridge 
B
To set the bridge into resonance 
C
To make the b ridge collapse 
D
To spread their weight evenly on the bridge 
Explanation.
Share Answer Soldiers march disorderly while crossing a bridge to prevent resonance because when soldiers march in orderly manner across a bridge, they generate a rhythmic oscillation of wave out. The bridge and at a certain point, would start oscillation to the same rhym as that of the marching steps. This oscillation would reach a maximum peak when the bridge can no longer sustain its own strength and hence collapses. So for this reasons, soldier are ordered to march disorderly while crossing a bridge

Correct Option:
A
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Question 5
A

0.8N

 
B

2.5N

 
C

0.5N

 
D

1.0N

 
Explanation.
Share Answer

Upthrust = change in weight

density = \(\frac{\text{mass}}{\text{volume}}\)

Mass of liquid displaced = Density of Liquid \(\times\) Volume;

= 103 \(\times\) 50 \(\times\) 10-6m3

= 0.05kg

(Note that the volume of 50cm3 was converted to m3 by multiplying by 106) i.e 50cm3 = 50 \(\times\) 10?6m3)

Since mass displaced = 0.05kg

Upthrust = mg = 0.05 \(\times\) 10

= 0.5N


Correct Option:
C
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Question 6
A
High pressure and low voltage 
B
High pressure and high voltage 
C
Low pressure and low voltage 
D
Low pressure and high volatge 
Explanation.
Share Answer Cathode rays are produced in a discharge tube under Low pressure and high voltage

Correct Option:
D
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Question 7
A
A man supports a heavy food above his head with his hands 
B
A boy climbs onto a table 
C
A man pushes unto a table 
D
A woman holds a pot of water 
Explanation.
Share Answer For work to be done, distance must be involved because
workdone = force \(\times\) distance

Correct Option:
B
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Question 8
A

7.53 x 105 Jkg\(^{-1}\)

 
B

7.53 x 10-2Jkg\(^{-1}\)

 
C

7.53 x 104Jkg\(^{-1}\)

 
D

7.53 x 10-3Jkg\(^{-1}\)

 
Explanation.
Share Answer

Latent Energy = mass(m) \(\times\) specific latent heat (L)
E = mL

L = \(\frac{E}{m}\)

= \(\frac{1.13 \times 10 ^{6}}{15}\)

= 7.53 \(\times\) 104Jkg\(^{-1}\)


Correct Option:
C
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Question 9
A

12.00%

 
B

25.00%

 
C

33.30%

 
D

75.00%

 
Explanation.
Share Answer

Internal resistance determine the maximum current that can be supplied

Efficiency =\(\frac{IR}{I(R + r)}\) \(\times\) 100

=\(\frac{I6}{I(6 + 2)}\) \(\times\) 100

= 75.00%


Correct Option:
D
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Question 10
A
Molecules of a liquid are stationary 
B
Brownian motion is an evidence of particle nature of matter 
C
Matter is made up of molecules 
D
The molecules of matter are in constant motion 
Explanation.
Share Answer Molecules of liquid are not stationary
Brownian motion is an evidence of particle nature of matter
matter is made up of molecules
The molecules of matter are in constant motion

Correct Option:
A
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