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51
A liquid is kept in a glass beaker. Which one of the following statement is correct regarding the pressure exerted by the liquid column at the base of the beaker?
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Answer: Option B
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52
The substance which does not expand on going from liquid state to solid state is
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Answer: Option C
Solution:
Understanding the Question:
This question asks us which of the given substances does NOT get bigger (expand) when it changes from a liquid to a solid.

Explanation of Options:
Option A: Water - When water freezes into ice, it actually expands. This is why ice floats and why pipes can burst in winter.
Option B: Cast-iron - Cast iron also expands when it solidifies. This property is useful in casting.
Option C: Aluminium - Aluminium contracts (gets smaller) when it solidifies. This is the opposite of expanding.
Option D: Type metal - Type metal expands when it solidifies allowing it to fill intricate molds.

Why the Answer is Aluminium:
Aluminium is the only substance on the list that contracts instead of expanding when it changes from liquid to solid.

Therefore, the correct answer is C: aluminium
53
At absolute zero, which one of the following is zero for a gas?
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Answer: Option B
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54
Very small insoluble particles in a liquid may be separated it by using
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Answer: Option D
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55
Lowering the atmospheric pressure on a liquid
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Answer: Option B
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56
Quartz is extensively used as a piezo-electric material. It contains
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Answer: Option B
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57
An ideal gas is one which obeys
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Answer: Option A
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58
Which one of the following could be the melting point of iron?
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Answer: Option D
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59
Consider the following statements.
1. The rate of diffusion of liquids is higher than that of solids.
2. In the liquid state, particles move freely and have greater space between each other as compared to particles in the solid state.
Which of the statement(s) given above is/are correct.
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Answer: Option C
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60
Ammonia (NH3) obtained from different sources always has same proportion of nitrogen and hydrogen. It proves the validity of law of
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Answer: Option B
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