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Question 2
A
MLT\(^{-1}\) 
B
MLT\(^{-2}\) 
C
MLT 
D
ML 
Explanation.
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Impulse = Force \(\times\) time

Force has the dimension \(\frac{ML}{T^{2}}\), hence

Impulse= \(\frac{ML}{T^{2}} \times T = \frac{ML}{T}\)


Correct Option:
A
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Question 3
A
3.0\(ms^{-1}\) 
B
4.5\(ms^{-1}\) 
C
6.0\(ms^{-1}\) 
D
18.0\(ms^{-1}\) 
Explanation.
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Given that \(u = 0ms^{-1}, a = 2ms^{-2}, s = 9m\)

We can use the equation, \(v^{2}=u^{2} +2as\) so that we have,

\(v^{2} = 0^{2} + 2\times 2\times 9\)

\(v^{2} = 36; v= 6.0ms^{-1}\)

Note; u = Initial velocity

v = final velocity

a = acceleration

s = distance covered


Correct Option:
C
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Question 4
A
Molecules of solids move more freely than molecules of liquids and gases 
B
Molecules of solids are more closely packed than those of liquids 
C
Energy is required to break the intermolecular forces of attraction between molecules 
D
Molecules of liquids move about within the liquid and they are in constant motion 
Explanation.
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All other properties of the different states of matter holds except that the molecules of solids don't move freely due to the fact that the particles in the solids are closely packed so it inhibits free motion.


Correct Option:
A
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Question 5
A
I only 
B
II only 
C
I and II only 
D
II and III only 
Explanation.
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The body while coming down is acted upon by acceleration due to gravity, hence, the vertical force is constant. Also, at maximum height, the vertical velocity is 0 and then increases as the body comes downward.


Correct Option:
D
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Question 6
A
4.0\(ms^{-2}\) 
B
13.1\(ms^{-2}\) 
C
16.0\(ms^{-2}\) 
D
22.6\(ms^{-2}\) 
Explanation.
Share Answer Resultant force F = (60 + 100Cos45)N = 130.1N Acceleration, a=F/m a= 130.1/10 = 13.1\(ms^{-2}\)

Correct Option:
B
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Question 7
A
2.0N 
B
3.0N 
C
3.5N 
D
7.0N 
Explanation.
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Upthrust = weight of liquid displaced

= mass of liquid displaced \(\times\) acceleration due to gravity

= \(\frac{200}{1000} \times 10\)

= 2N


Correct Option:
A
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Question 10
A
B
II 
C
III 
D
IV 
Explanation.
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No official Explanation yet!


Correct Option:
B
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