1
MHT CET 2024 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A lead bullet moving with velocity ' V ' strikes a wall and stops. If $75 \%$ of its energy is converted into heat, then the increase in temperature is ( $\mathrm{s}=$ specific heat of lead, $\mathrm{J}=$ mechanical equivalent of heat)

A
$\frac{3 \mathrm{~V}^2}{8 \mathrm{Js}}$
B
$\frac{5 \mathrm{~V}^2}{8 \mathrm{Js}}$
C
$\frac{3 \mathrm{~V}^2}{4 \mathrm{Js}}$
D
$\frac{5 \mathrm{~V}^2}{4 \mathrm{Js}}$
2
MHT CET 2024 9th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The potential energy of a long spring when it is stretched by 3 cm is ' $U$ '. If the spring is stretched by 9 cm , potential energy stored in it will be

A
3U
B
4U
C
5U
D
9U
3
MHT CET 2024 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A carpet of mass ' $M$ ' made of a material is rolled along its length in the form of a cylinder of radius ' $R$ ' and kept above the rough floor. If the carpet is unrolled without sliding to a radius ' $R / 2$ '. The change in potential energy is ( $\mathrm{g}=$ acceleration due to gravity)

A
MgR
B
$\frac{7}{8} \mathrm{MgR}$
C
$\frac{5}{7} \mathrm{MgR}$
D
$\frac{3}{4} \mathrm{MgR}$
4
MHT CET 2024 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A ball ' $A$ ' is projected vertically upwards with certain initial speed. Another ball 'B' of same mass is projected at an angle of $30^{\circ}$ with vertical with the same initial speed. At the highest point, the ratio of potential energy of ball A to that of ball B will be

$$\left(\sin 90^{\circ}=1, \sin 60^{\circ}=\cos 30^{\circ}=\frac{\sqrt{3}}{2}, \sin 30^{\circ}=\cos 60^{\circ}=\frac{1}{2}\right)$$

A
$4: 3$
B
$3: 4$
C
$4: 1$
D
$3: 2$
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