ISRO Scientist or Engineer Mechanical 2008
For the following questions answer them individually
The quantity of heat required to change the temperature of 1 gm of ice from $$—6^\circ C$$ to $$—5^\circ C$$ is known as
The spectral energy distribution for a body at temperature T is shown in figure. Now if the temperature of the body is increased
When K is the thermal conductivity, $$\tau$$ is the density and $$C_p$$, is the specific heat of a substance, then thermaldiffusivity is given by
The determinant of the matrix $$\begin{bmatrix}7 &0 & 0 & 0 \\9 & 3 & 0 & 0 \\4 & -6 & -2 & 0 \\0 & 0 & 0 & 1 \end{bmatrix}$$ is
A thin copper wire at $$300^\circ$$ is suddenly immersed in water at $$30^\circ C$$. It cools down to $$150^\circ C$$ in 70 seconds. It is then reheated to the initial temperature of $$300^\circ C$$ and suddenly exposedto air at $$30^\circ C$$ whereit cools down to $$150^\circ C$$ in 200 seconds. This difference in cooling time is due to
A heavy block of mass m is slowly placed on a conveyer belt moving with speed v. If coefficient of friction between block and the belt is $$\mu$$, the block will slide on the belt through distance
A car moving with speed u can be stopped in minimum distance x when brakes are applied. If the speed becomes n times, the minimum distance over which the car can be stopped would take the value
Speed of particle executing simple harmonic motion with amplitude a is half of the maximum speed. At that instant, displacement of the particle is
Two blocks with masses M and mare in contact with each other and are resting on a_ horizontal frictionless floor. When horizontal force is applied to the heavier, the blocks accelerate to the right. The force between the two blocks are
A stone of mass m at the end of a string of length | is whirled in a vertical circle at a constant speed. The tension in the string will be maximum when the stone is
