Question
The maximum load a wire can withstand without breaking, when its length is reduced to half of its original length, will
- Be double.
- Be half.
- Be four times.
- Remain same.
✓
Answer
- Remain same.
Explanation:
$\text{Breaking stress}=\frac{\text{Breaking force}}{\text{Area of cross - section}}$
Since breaking force doesn't depend on length, hence changing the cross section has no effect.
So the breaking force remain same.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A solid sphere is in rolling motion. In rolling motion a body possesses translational kinetic energy $(K_t)$ as well as rotational kinetic energy $(K_r)$ simultaneously. The ratio $K_t : (K_t + K_r)$ for the sphere is
→A particle is thrown vertically upwards with a velocity of $4\,ms^{-1}$. The ratio of its accelerations after $1\,s$ and $2\,s$ of its motion is
→Acontainer of large surface area is filled with liquid of density $\rho$ .Acubical block of side edge $a$ and mass $M$ is floating in it with four-fifth of its volume submerged. If a coin of mass $m$ is placed gently on the top surface of the block is just submerged. $M$ is
→The AC voltage across a resistance can be measured using:
- A potentiometer.
- A hot-wire voltmeter.
- A moving-coil galvanometer.
- A moving-magnet galvanometer.
Of two masses of $5 \,kg$ each falling from height of $10\, m,$ by which $2\,kg$ water is stirred. The rise in temperature of water will be........ $^oC$
→If vibrations of a string are to be increased by a factor of two, then tension in the string must be made
Figure given below shows four progressive waves $A, B, C$ and $D$ with their phases expressed with respect to the wave $A$ . It can be calculated from the figure that
→A body having its centre of mass at the origin has three of its particles at (a, 0, 0), (0, a, 0), (0, 0, a). The moments of inertia of the body about the X and Y axes are 0.20kg-m2 each. The moment of inertia about the Z-axis:
→- Is 0.20kg-m2
- Is 0.40kg-m2
- Is $0.20\sqrt2\text{kg-m}^2$
- Cannot be deduced with this information.
In a simple harmonic oscillation, what fraction of total mechanical energy is in the form of kinetic energy, when the particle is midway between mean and extreme position.
$1\ mole$ of a gas with $\gamma$ = $7/5$ is mixed with $1\ mole$ of a gas with $\gamma$ = $5/3$, then the value of $\gamma$ for the resulting mixture is
→