Related Questions

When a bar of length '$$l$$' and diameter 'd' is rigidly fixed at the upper end and hanging freely, then the total elongation produced in the bar due to its own weight is (where w = Weight per unit volume of the bar)
A $$\frac{{{\text{w}}l}}{{2{\text{E}}}}$$
B $$\frac{{{\text{w}}{l^2}}}{{2{\text{E}}}}$$
C $$\frac{{{\text{w}}{l^3}}}{{2{\text{E}}}}$$
D $$\frac{{{\text{w}}{l^4}}}{{2{\text{E}}}}$$
If a bar magnet is __, the two pieces form two complete magnets, each with north and south pole.
A broken
B broke
C breaking
D break
When a bar magnet is cut into two equal halves, the pole strength of each piece –
A Becomes double
B Becomes half
C Becomes zero
D Remains the same
Which one of the following statements about bar magnet is correct?
A The pole strength of the North pole of a bar magnet is larger than that of the South pole
B When a piece of bar magnet is bisected perpendicular to its axis, the North and South poles get separated
C When a piece of bar magnet is bisected perpendicular to its axis, two new bar magnets are formed
D The poles of a bar magnet are unequal in magnitude and opposite in nature
What is the net force experienced by a bar magnet placed in a uniform magnetic field?
A Zero
B Depends upon length of themagnet
C Never zero
D Depends upon temperature
When heated an iron bar expands 0.2% . If the increased length is 1cm , what is the original length of the bar ?
A 500cm
B 5cm
C 0.97cm
D 1.97cm
20°C  তাপমাত্রায় ও 1.5 bar চাপে একটি গ্যাস     0.1m3 আয়তন দখল করে। যদি গ্যাসের চাপ 7.5 bar এ সঙ্কুচিত করার ফলে   0.04m3    আয়তন দখল করে, তবে গ্যাসের শেষ তাপমাত্রা বাহির কর।
A    293°C  
B 313°C    
C     586°C 
D       213°C     
If a load W is applied instantaneously on a bar; Then the stress induced in bar will
A Be independent of ratio of mass of load W to mass of bar (y)
B Increase with increase in y
C Decrease with decrease in y
D Depend on other considerations
The elongation of a conical bar under its own weight is __________ that of prismatic bar of the same length.
A Equal to
B Half
C One-third
D Two-third
A simply supported uniform rectangular bar breadth b, depth d and length L carries an isolated load W at its mid-span. The same bar experiences an extension e under same tensile load. The ratio of the maximum deflection to the elongation, is
A $$\frac{{\text{L}}}{{\text{d}}}$$
B $$\frac{{\text{L}}}{{2{\text{d}}}}$$
C $${\left( {\frac{{\text{L}}}{{2{\text{d}}}}} \right)^2}$$
D $${\left( {\frac{{\text{L}}}{{3{\text{d}}}}} \right)^2}$$

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