When a ring of metal is heated what happens to its hole ?

A Expands
B Contracts
C It expands or contracts according to its diameter
D It expands or contracts according to its coefficient of expansion

Correct Answer: Expands

The hole size will increase because in expansion the size between two molecules do not increase so when the molecules on the outer edge move outward. Due to expansion, the size of the hole will also increase so as to compensate the distance change between the molecules.
Bissoy MCQ
#General Knowledge #Physics

Related Questions

If there is a circular hole in a metal plate, what happens to the radius of the hole when the plate is heated?
A Increases
B Decreases
C Unchanged
D Depends upon the metal
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ?
A Increase
B Dacrease
C Remain constant
D Will increase first and then dcrease
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where $$\sigma $$ = Stress for a plate with no hole i.e. nominal stress)
A $$\sigma \left( {1 + \frac{{\text{b}}}{{2{\text{a}}}}} \right)$$
B $$\sigma \left( {1 + \frac{{2{\text{a}}}}{{\text{b}}}} \right)$$
C $$\sigma \left( {1 + \frac{{\text{b}}}{{3{\text{a}}}}} \right)$$
D $$\sigma \left( {1 + \frac{{3{\text{a}}}}{{\text{b}}}} \right)$$
And when this happens, and when we allow freedom ring, when we let it ring from every village and every hamlet ____ will be able to join hands and sing in the words of the old Negro spiritual, "Free at last! In this statement what does the word hamlet refer to  __
A a dream
B a state
C a small village
D a poem
When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where $${\tau _{\text{u}}}$$ = Ultimate shear strength of the material of the plate)
A $${\text{dt}}{\tau _{\text{u}}}$$
B $$\pi {\text{dt}}{\tau _{\text{u}}}$$
C $$\frac{\pi }{4} \times {{\text{d}}^2}{\tau _{\text{u}}}$$
D $$\frac{\pi }{4} \times {{\text{d}}^2} \times {\text{t}}{\tau _{\text{u}}}$$
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be
A Same in both cases
B 2 times more
C 3 times more
D 4 times more
If it takes 50 workers 4 hours to dig a hole, how long should it take 30 workers to dig the same hole?
A 2 hrs, 24 mins
B 6 hrs, 12 mins
C 5 hrs, 12 mins
D 6 hrs, 40 mins
If it takes 4 hours to dig a hole by 50 workers, how long should it take to dig the same hole by 30 workers?
A 2 hours 24 minutes
B 6 houres 12 minutes
C 5 houres 12 minutes
D 6 hours 40 minutes
Of the following , which is a hole that could be the empty hole ?
A 1
B 2
C 4
D 6
দেওয়া আছে (i) অর্ধপরিবাহীর Majority carrier election, (ii) p-type অর্ধপরিাবাহীর Majority carrier hole এবং (iii) pure অর্ধপিরবাহীর Majority carrier hole । নিচের কোনটি সঠিক?
A i ও ii
B ii ও iii
C i ও iii
D i, ii, ও iii

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