Physics 2018 | Study Mode

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Question 2
A
\(\frac{stress}{strain}\) 
B
\(\frac{strain}{stress}\) 
C
\(stress \times strain\) 
D
\(\sqrt{\frac{stress}{strain}}\) 
Explanation.
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Elastic modulus is the ratio of pressure (stress) applied to a body to the resistance (strain) produced by the body.

= \(\frac{stress}{strain}\)


Correct Option:
A
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Question 3
A
PQ 
B
QR 
C
RS 
D
QS 
Explanation.
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The height of the mercury column in a simple barometer is calculated as the atmospheric pressure.


Correct Option:
B
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Question 4
A
momentum 
B
Inertia 
C
impulse 
D
Energy 
Explanation.
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Inertia is the resistance of the object to any change in its motion, including a change in direction. An object will stay still or keep moving at the same speed and in a straight line, unless it is acted upon by an external unbalanced force.


Correct Option:
B
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Question 5
A
thickest at the top 
B
thickest at the middle 
C
thickest at the bottom 
D
of the same thickness throughout 
Explanation.
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The pressure of the water is much greater deeper down and the dam needs to be thick at the bottom so that it is strong enough to withstand this larger pressure.


Correct Option:
C
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Question 6
A
Fv 
B
zero 
C
Fmr 
D
\(\frac{Fr}{m}\) 
Explanation.
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The work done by centripetal force in the case of a uniform circular motion is 0 joules.


Correct Option:
B
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Question 7
A
I and III only 
B
I and II only 
C
II and III only 
D
I, II and III 
Explanation.
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In SHM, the body must have acceleration in a direction opposite to the displacement and the acceleration must be directly proportional to displacement. Also, the acceleration must be directed towards its mean position. This is not the case with a football on the pitch.


Correct Option:
A
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Question 8
A
6kg 
B
9kg 
C
10kg 
D
15kg 
Explanation.
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Total force exerted on the block = (10 - 1)N =9N

Force = mass x acceleration

9 = m x 1.5

m = 9/1.5 = 6kg


Correct Option:
A
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Question 9
A
I and II 
B
II, III and IV 
C
I, II, III and IV 
D
I, III and IV 
Explanation.
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The quantities Efficiency, Dielectric constant and Refractive index are dimensionless.


Correct Option:
D
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Question 10
A
The vertical distance covered 
B
Acceleration due to gravity 
C
The horizontal distance covered 
D
The acceleration of the body 
Explanation.
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\(R_{max} = \frac{u^{2}}{g}\)

Hence, \(g = \frac{u^{2}}{R_{max}}\)


Correct Option:
B
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