1
MHT CET 2019 2nd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $\alpha$ is the coefficient of performance of a refrigerator and ' $Q$ ' is heat released to the hot reservoir, then the heat extracted from the cold reservoir ' $Q_2$ ' is

A
$\frac{\alpha Q_1}{\alpha-1}$
B
$\frac{\alpha-1}{\alpha} Q_1$
C
$\frac{\alpha Q_1}{1+\alpha}$
D
$\frac{1+\alpha}{\alpha} Q_1$
2
MHT CET 2019 2nd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The real force ' $F$ ' acting on a particle of mass $m$ ' performing circular motion acts along the radius of circle ' $r$ ' and is directed towards the centre of circle. The square root of magnitude of such force is ( $T=$ periodic time)

A
$\frac{2 \pi}{T} \sqrt{m r}$
B
$\frac{T m r}{4 \pi}$
C
$\frac{2 \pi T}{\sqrt{m r}}$
D
$\frac{T^2 m r}{4 \pi}$
3
MHT CET 2019 2nd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Dimensions of Gyromagnetic ratio are

A
$\left[L^1 M^0 T^1 I^1\right]$
B
$\left[L^0 M^{-1} T^1 I^1\right]$
C
$\left[L^1 M^0 T^0 I^{-1}\right]$
D
$\left[L^{-1} M^0 T^1 I^1\right]$
4
MHT CET 2019 2nd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The maximum velocity of the photoelectron emitted by the metal surface is ' $v$ '. Charge and mass of the photoelectron is denoted by ' $e$ ' and ' $m$ ' respectively. The stopping potential in volt is

A
$\frac{v^2}{2\left(\frac{m}{e}\right)}$
B
$\frac{v^2}{2\left(\frac{e}{m}\right)}$
C
$\frac{v^2}{\left(\frac{e}{m}\right)}$
D
$\frac{v^2}{\left(\frac{m}{e}\right)}$
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